Atom a has an atomic number of 19 and mass number of 40. Atom b has an atomic number of 20 and a mass number of 40. Which of these is an accurate statement?.

Answers

Answer 1

Atom A has one less proton and one less electron than Atom B.

An electron is a type of subatomic particle with a negative charge. A proton is a type of subatomic particle with a positive charge. Protons are held together by strong nuclear forces within the nucleus. A neutron is a type of subatomic particle that has no electric charge (it is neutral).

Protons are one of the three main particles that make up an atom. Protons are inside the nucleus. This is a small, dense area in the center of the atom. A proton has a positive charge of 1 (+1) and a mass of 1 atomic mass unit (amu), which is approximately 1.67 × 10−27 kilograms. Together with neutrons, they make up virtually the entire mass of an atom.

Atoms of all elements except most hydrogen atoms have neutrons in their nuclei. Unlike protons and electrons, which carry a charge, neutrons have no charge and are electrically neutral. So the neutron is denoted by n0 . Zero represents zero charge. The mass of a neutron is slightly larger than that of a proton, 1 atomic mass unit (amu). (A unit atomic mass is about 1.67 × 10−27 kilograms.) Neutrons are also about the same diameter as protons, or 1.7 × 10−15 meters.

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Related Questions

What do your observations show you about the forces exerted on objects in a collision?

Answers

When two objects collide, they exert forces on each other that can cause one or both of them to move in a certain direction and with a certain quantity of energy.

These forces can be calculated by considering the mass of each object, the velocity of each object, and the distance between them. Depending on the type of collision, the forces exerted on each object will differ.

Inelastic collisions occur when the objects stick together or the kinetic energy of the objects is not conserved. In this type of collision, the forces exerted on each object are equal in magnitude but opposite in direction. This means that one object is pushing the other in one direction, while the other object is pushing in the other direction. As a result, the objects will move in a combined direction with a decreased kinetic energy.

Elastic collisions occur when the objects bounce off one another and the kinetic energy of the objects is conserved. In this type of collision, the forces exerted on each object are still equal in magnitude but opposite in direction. However, the objects will move in opposite directions with the same kinetic energy as before.

The forces exerted on objects in a collision can also be affected by external factors such as friction, air resistance, and gravity. In a collision with friction, the forces exerted on each object will be in the same direction and the kinetic energy of the objects will be decreased due to the energy lost to heat. In a collision with air resistance, the forces exerted on each object will be in the same direction and the kinetic energy of the objects will be decreased due to the energy lost to air drag. In a collision with gravity, the forces exerted on each object will be in the same direction and the kinetic energy of the objects will be decreased due to the energy lost to gravity.

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find the acceleration if the change in velocity is 5 m/s and the time is 15 seconds 5 m/s2 25 m/s2 0.33 m/s2 0.5 m/s2

Answers

The acceleration would be 0.33 / ms².

What do we called an acceleration ? The rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing.

Thus if we go mathematically:

Given:

v = 5m/s

t = 15 sec

hence a = v/t ,

 a = 5/15

 a= 0.33 m/s²

The acceleration would be 0.33 / ms².

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nutritionists express energy in calories, which are in fact 1000 real calories. one real calorie is equivalent to 4.18 joules, the universal energy unit. thus, one nutrition calorie is equivalent to

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Nutritionists express energy in calories, which are in fact 1000 real calories. one real calorie is equivalent to 4.18 joules, the universal energy unit. thus, one nutrition calorie is equivalent to 4.18 kilojoules.

Joule is the fundamental energy unit of the metric system, or the International System of Units in a later, more thorough version (SI). In the end, the meter, kilogram, and second are used to characterize it.

Calorie: In the past, the definition of a calorie included the heating of water. Consequently, according to a conventional definition, one calorie is the quantity of heat needed to raise the temperature of one gram of water by one degree Celsius, from 14.5 to 15.5 degrees.

The "calorie" measured for other temperature ranges differs slightly from this, which is frequently referred to as the 15 °C calorie. The calorie has more recently been defined in terms of the joule; historically, the calorie and joule have been equivalent to mechanical heat.

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a projectile is fired horizontally from the top of a cliff. the projectile hits the ground 4 s later at a distance of 2 km from the base of the cliff. what is the height of the cliff?

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A projectile is fired horizontally from the top of a cliff. the projectile hits the ground 4 s later at a distance of 2 km from the base of the cliff The height of the cliff 80m

A projectile is fired horizontally from the top of a cliff. the projectile hits the ground 4 s later at a distance of 2 km from the base of the cliff

h = 1/2gt2

t=4

g= 10

h = 80m

The height of the cliff 80m

A projectile is also anything that is hurled upward at an angle to the horizontal (provided that the influence of air resistance is negligible). Any object that, after being launched or dropped, continues to move due to its own inertia and is only affected by gravity's downward pull is referred to as a projectile. The force of gravity is the only force that can be said to act on a projectile by definition.

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if i want to find a sizeable collection of population ii stars in the milky way galaxy, where would be a good place to look?

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Population II stars can be detected to be present in the halos of different spiral galaxies and in the huge globular clusters of the milky way galaxy.

It is known to us that -

There are populations I and II stars and stellar collections

These stars can be differentiated on the basis of their age from creation time, chemical constitution, and their location in the galaxy systems

Since, we want to identify the place where a sizeable collection of population II stars can be found in the milky way galaxy, let us first learn a bit about the population II stars.

Population II stars constitute of the oldest identified stars and clusters. These stars were created nearly 1,000,000,000 - 15,000,000,000 years ago.

These population II stars can be detected to be present in the halos of different spiral galaxies and in the huge globular clusters of the milky way galaxy.

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the total amount of energy in the universe never changes, but the amount of energy available for work at any given moment varies tremendously. what best explains this change in available energy?

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The total amount of energy in the universe never changes, but the amount of energy available for work at any given moment varies tremendously therefore interconversion of energy explains the change in available energy.

What is Law of conservation of energy?

This law states that energy can neither be created nor destroyed but can only converted from one form of energy to another.

The universe as a whole is referred to as a closed system which is why its  total amount of energy never changes. However, energy can be converted from one form to another through various means.

The amount of energy available for work at any given moment varies tremendously and it is caused as  a result of energy interconversion which is therefore the reason why it was chosen as the correct choice.

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What is the frequency of light with a wavelength of 4.257 x10 7 meters?

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The frequency of light wave  is 0.704Hz.  if its wavelength is  4.257×10⁻⁷m .Frequency is inversely proportional to time-period.

Exactly when a wave goes through reflection, it essentially remains in the medium and simply switches its going of development. The smooth wave has traveled twofold its distance. This reflection characteristic of waves is consistently found in sound waves.

Exactly when you let out a boisterous cry inside a gorge, you habitually hear the resonation of the holler. The sound waves travel through the medium; for this present circumstance, the air and bob off the ravine wall and return to the start of the sound (you). The result is that you hear the resonation of your holler.

We know that when an electromagnetic wave is going through speed v passing in a medium, it contains specific speed and frequency which is given by the expression

c=ν × λ

where c is the speed of light in vacuum,

ν is the frequency of the wave and

λ is the wavelength of the wave.

Now, we know that speed(c) of light wave is 3 ×10⁸m/sec

Also, we have wavelength(λ)=4.257×10⁻⁷m

Therefore, frequency=speed/wavelength

=>ν = (3 ×10⁸m/sec) / 4.257×10⁻⁷m

=>ν =0.704/sec

or ν =0.704Hz

Hence, frequency of light is 0.704Hz.

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the threshold of hearing is defined as the minimum discernible intensity of the sound. it is approximately 10−12w/m2 . find the distance d from the car at which the sound from the stereo can still be discerned. assume that the windows are rolled down and that each speaker actually produces 0.06 w of sound, as suggested in the last follow-up comment.

Answers

The distance is 97720.5 m

From the question, we have

P = 0.06 W × 2 = 0.12 W

d = ?

Sound intensity, I = P/4πd²

I = 10⁻¹² W/m²

10⁻¹² = 0.12/4πd²

d = 97720.5 m

The distance is 97720.5 m

Sound intensity :

The power carried by sound waves per unit area in the direction  perpendicular to that region is known as sound intensity or acoustic intensity. The watt per square meter (W/m2) is the SI unit of intensity, which also covers sound intensity. Sound intensity is a measure of how quickly energy moves across a given space. The unit area in the SI measurement system is 1 m2. So Watts per square meter are used to measure sound intensity. As there will be energy flow in certain directions but not in others, sound intensity also provides a measure of direction.

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object a has a 1.0-kg mass. what should be the mass of object b? the numbers indicate the relative lengths of the rods on each side of their supporting cords.

Answers

The mass of object b will be 1.5kg.

What is the short explanation of torque?

As a twisting or turning force, torque frequently causes objects to rotate around an axis, which could be the center of mass or a fixed point. Another way to think of torque is the capacity of something rotating, such as a shaft or gear, to overcome turning resistance.

Balancing torque for lower end

m x 2 = [tex]m_{A}[/tex] x 1

m = 1x1/2

m = 0.5kg

for middle one

(mA + m) x 2 = [tex]m_{0}[/tex] x 1

[tex]m_{0}[/tex] = (0.5+1) × 2

[tex]m_{0}[/tex] = 3.0kg

for upper end

[tex]m_{B}[/tex] x 3 = ([tex]m_{A}[/tex]+m+[tex]m_{0}[/tex]) x 1

[tex]m_{B}[/tex] x 3 =  (1+0.5+3)

[tex]m_{B}[/tex] x 3 = 4.5

[tex]m_{B}[/tex] = 4.5/3

[tex]m_{B}[/tex] = 1.5kg.

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how would the europa clipper mission deal with the special hazard that faces any spacecraft that tries to study europa close-up?

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NASA's Europa Clipper will conduct detailed reconnaissance of Jupiter's moon Europa and investigate whether the icy moon could have conditions suitable for life.

The magnetometer investigation aims to confirm that Europa's ocean exists, measure its depth and salinity, and measure the moon's ice shell thickness. It will also study Europa's ionized atmosphere and how it interacts with Jupiter's ionized atmosphere. On February 10, 2021, it was announced that the mission would use a 5.5-year trajectory to the Jovian system, with gravity-assist maneuvers involving Mars (February 2025) and Earth (December 2026). Europa Clipper's main science goal is to determine whether there are places below Europa's surface that could support life. Jupiter's moon Europa shows strong evidence for an ocean of liquid water beneath its icy crust.

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A spring is attatched at one end to support B and at the other end to collar A, as represented in the figure. Collar A slides along the vertical bar between points C and D.Part A when 0 = 28 degrees, what is the distance from point A to point B to the nearest tenth of a foot?Part B When the spring is stretched and the distanced from point A to point B is 5.2 feet, what is the valuue of 0 to the nearest tenth of a degree?

Answers

(A) The distance from point A to point B to the nearest tenth of a foot will be 3.4 ft.

(B)  The value of 0 to the nearest tenth of a degree will be 54.8°

SOH, CAH, and TOA are the trigonometry ratios that need to be solved in order to find necessary measures or angles in a right triangle.

A) Reference angle  = 28 degrees

Distance  A-B = ?

Adjacent = 3 ft

We will calculate the distance between A-B by using the trigonometry function, CAH, that is:

    Cos ∅ = adj ÷ hyp

    Cos 28° = 3 ÷ A-B

    A-B = 3 ÷ Cos 28°

    A-B = 3.4 ft

B) Reference angle  = ?

Distance  A-B = 5.2 ft

Adjacent = 3 ft

We will calculate the distance between A-B by using the trigonometry function, CAH, that is:

    Cos ∅ = adj ÷ hyp

Put the values

    Cos ∅ = 3 ÷ 5.2

    ∅ = Cos⁻¹ (3 ÷ 5.2)

    ∅ = 54.8°

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if the horizontal distance, that is, the distance in the direction of propagation, between a crest and the adjacent trough of a sine wave is 1 m, what is the wavelength of the wave?

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2M  is the wavelength of the wave.

Let's start by defining what a wave is.

A WAVE is a disturbance that also carries energy and moves it via either matter or space with little to no mass transit as defined by science, more specifically by physics.

Now, keep in mind that a wavelength is the distance between a wave's crest and trough.

Observe the example provided.

We initially encounter a dip at the bottom before reaching the next crest as we move from the previous crest to the right to get there. Furthermore, the center of the two crests is this trough. As a result, the horizontal distance between each crest is twice as great as the horizontal distance between each crest and the trough. A mathematical equation including it

(Crest to Crest) Distance = 2 x Distance (crest to trough)

D(cc) = 2D(ct) (ct)

Where D(cc) is also the wavelength that we're interested in.

Wavelength is two (4.6cm)

W=2m

Therefore, the wavelength is 2m.

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what is angular speed (in rpmrpm ) or a 500 gg ball swinging in a 20- cmcm -radius circle at the end of a 1.0- mm -long string?

Answers

67.51 rpm is angular speed for a 500 g ball swinging in a 20 cm radius circle at the end of a 1.0 m long string

What is angular speed?

A net external torque is required for rigid bodies in order for there to be an angular acceleration. This is not true for non-rigid bodies, though: As an illustration, a figure skater may accelerate her spin without the need for an external force by merely squeezing her arms and legs inward.

Given that,

mass of ball (m) = 500 gm = 0.5 kg

radius of ball (R) = 20 cm = 0.2 m

length of string = 1 m

Let, θ be the angle formed by the string with vertical.

T cos θ = mg ........(i)

T sin θ = mω²r ..........(ii)

Now, (ii) ÷ (i)

T sin θ/ T cos θ = mω²r/ mg

or, tan θ = ω²r/ g

or,  ω = [tex]\sqrt{g/r}[/tex] tanθ

By Pythagoras theorem,

h² + R² = l²

or, h = [tex]\sqrt{(1)^2 - (0.2)^2}[/tex]

or, h = 0.98 m

Next,

tan θ = R/h

tan θ = 1 m/0.98 m

Now, ω = [tex]\sqrt{g/r}[/tex] tanθ

or, ω = [tex]\sqrt{9.8/0.2}[/tex] 1 m/0.98 m

or, ω =  7.07 rad/sec

So, putting the values:

ω = 2πN/60

or, 7.07 = 2πN/60

or, N = 67.51 rpm.

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Four cube-shaped blocks are floating in equilibrium in a tank of water. Blocks A, B, and C have the same size. Block D is larger than the others. The masses of the blocks are unknown.Part (a) Rank the magnitudes of the buoyant forces acting on blocks A, B, C, and D in order of greatest to smallest.Part (b) Rank the masses of the blocks from greatest to smallest.Part (c) Rank the densities of the blocks from greatest to smallest.

Answers

The ranking of magnitude of buoyant forces of the four boxes from greatest to smallest is FD>FA=FB>FC. The ranking of masses of the blocks from greatest to smallest is mD>mA=mB>mC and the ranking of densities of the blocks from greatest to smallest is pA=pB=pD>pC.

(a) The buoyant force is the upward force exerted on an object wholly or partly immersed in a fluid. This upward force is also called Upthrust. Due to the buoyant force, a body submerged partially or fully in a fluid appears to lose its weight, i.e. appears to be lighter. It depends on acceleration due to gravity, volume of fluid and fluid density.

Thus, the order of force on the block from greatest to smallest is FD>FA=FB>FC.

(b) Mass (symbolized m) is a dimensionless quantity representing the amount of matter in a particle or object. The standard unit of mass in the International System (SI) is the kilogram (kg). If an object's average density is less than that of the surrounding fluid, it will float. The reason is that the fluid, having a higher density, contains more mass and hence more weight in the same volume. The buoyant force, which equals the weight of the fluid displaced, is thus greater than the weight of the object.

Thus, the order of mass on the block from greatest to smallest is mD>mA=mB>mC.

(c) Buoyant force is directly proportional to the density of the liquid displaced. So, greater the density of the liquid, greater is the buoyant force due to the liquid. So, the order of density on the block from greatest to smallest is pA=pB=pD>pC.

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The default setting shows two people holding one object each. The mass of the blue object is 50 kilograms and the red one is 200 kilograms. Note that the value of force each object applies on the other is the same (0.000000041712 newtons), but in the opposite direction. This value is written in standard notations. Express this value in scientific notation.
Please help

Answers

The value of 0.000000041712 N written in standard notations can be expressed as 41.712 × [tex]10^{-9}[/tex] N in scientific notation.

Scientific Notation in Science

This is a way of expressing large and small quantity as a simple number. The number will be multiply by a power of ten which is known as multiplying factor

Given that the value of force each object applies on the other is the same which is 0.000000041712 newtons, but in the opposite direction. This value is written in standard notations.

This number can be expressed as

0.000000041712 N = 41.712 nN

That is, 41.712 nano Newton

The multiplying factor of nano is [tex]10^{-9}[/tex]

To express this value in scientific notation, multiply the number 41.712 by the multiplying factor. That is,

0.000000041712 N = 41.712 ×  [tex]10^{-9}[/tex] Newtons

Therefore, the value of 0.000000041712 N of force each object in scientific notation is 41.712 × [tex]10^{-9}[/tex] N

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How do you find the scale factor of a dilation example?

Answers

Scale factor is found by estimating the pixel and data of geometry or image.

A scale factor is a number that allows you to resize a geometric figure or shape relative to its original size. The ratio of the size of the original image and the enlarged image.Magnification can be represented by or .If the scale factor is greater than 1 (>1), the image will be enlarged.If the scale factor is less than 1 (0<<1), the image will be scaled down.If the scale factor is 1 (=1), the image remains the same.Magnification lets you increase or decrease the size of an object. The basic formula for determining the scaling coefficient of the extended illustration is

[tex]scale. factor=\frac{x}{y} \\\\x=dim. new-shape\\y=dim.original-shape[/tex][tex]Scale factor = \frac{x}{y} \\\\x= new -shape\\y=original- shape[/tex]

Example -

Strain Scale 2: The center of strain in the coordinate plane is the origin (0, 0).

Let ABC be a triangle on the coordinate plane. The points in the coordinate plane are A(0, 2), B(2, 1), C(-2, -2).

If the scale factor is 2, each coordinate point of the original triangle is multiplied by a scale factor of 2.

So the triangle drawn is A'B'C' and the resulting coordinate points are A'(0 , 4), B'(4, 2), C'(-4, -4).

Stretch by a factor of 2, then multiply by 2.

(x,y) → (2x,2y)

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when they look into the universe, astronomers observe that nearly all galaxies are moving away from the milky way. this observation suggests that

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An observer in a distant galaxy would make the same observation as the universe is expanding continuously.

From the big bang till now the universe is continuously expanding which means that the galaxies and the other celestial bodies are moving far from each other which is also a reason that the universe is cooling down since the big bang has happened. So if we observe that universe is expanding it is not a big deal we're moving away from the galaxies and galaxies are moving far from us... and we're moving apart from other galaxies.

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A tennis ball (0.23 kg) is thrown straight up in the air with a speed 4.8 m/s. How much potential
will it have when it reaches the highest point?

Answers

2.6496 J has the potential to reach its maximum point, according to the statement.

What does physics define as speed? Who established speed?

Speed is the rate at which the position of an item shifts in any direction. Speed is defined as the proportion of the distance traveled to the time required to cover that distance. Speed is a scalar quantity because it has a velocity and no quantity. Galileo Galilei, an Italian physicist, is recognized with becoming the first to calculate speed by dividing it by the distance traveled and the time required. Galileo defined speed as the distance covered in a predetermined period of time.

Briefing:

Potential energy becomes kinetic energy in this situation;

K.E. = ½ mv²

= ½ x 0.23 x (4.8)²

= 2.6496 J(joule)

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1-kg of water (specific heat 4200 j/(kg c)) is mixed with 1-kg of a mystery substance. the water is initially at 35 c, and the mystery substance is initially at 20 c. the final temperature the mixture reaches is 25 c. what is the heat capacity of the mystery substance? answer in j/(kg c).

Answers

When 1 kg of water (specific heat 4200 j/(kg c)) and 1 kg of a mystery substance are combined, the mystery substance has a heat capacity of 8400 J/kg C. Initial water temperature is 35 c.

The quantity of heat that must be applied to an object in order to cause a unit change in temperature is known as the specific heat  or thermal capacity of that object. Joules per kelvin (J/K) is the SI unit for heat capacity. An extensive property is heat capacity. The unidentified compound was discovered to be extremely similar to the drug fluoxetine but not exactly the same. In actuality, the two compounds are isomers, which are atoms that are bound to one another in distinct ways despite having the same number and type of atoms.

1*4200(35-25) = 1*C(25-20)

C = (1*4200*10)/5

C = 8400J/kg C

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A person stands on a bathroom scale that rests on the floor of an elevator (lift). When the elevator is stationary the scale registers 35.9 kg. When the elevator (lift) accelerates upwards the scale registers 44.3 kg. Taking the acceleration of gravity to be 9.81 m s², calculate the acceleration of the elevator (lift) when the scale registers 44.3 kg.​

Answers

Answer and Explanation:

To solve this problem, we need to use the formula for weight, which is given by the product of mass and acceleration of gravity. The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity. In this case, the weight of the person on the scale is given by the difference between the two readings on the scale, which is 44.3 kg - 35.9 kg = 8.4 kg.

Since the acceleration of gravity is known to be 9.81 m/s^2, we can use this value to calculate the acceleration of the elevator (lift) when the scale registers 44.3 kg. The formula for acceleration is given by the change in velocity over time. In this case, the change in velocity is the difference between the person's weight when the elevator is stationary and when it is accelerating upwards. This means that the acceleration of the elevator (lift) is given by 8.4 kg / (9.81 m/s^2 * t), where t is the time over which the acceleration occurs.

Therefore, to calculate the acceleration of the elevator (lift), we need to know the time over which the acceleration occurs. Since this information is not provided in the question, we cannot determine the exact acceleration of the elevator (lift). However, we can say that the acceleration of the elevator (lift) is proportional to the difference in weight readings on the scale and inversely proportional to the acceleration of gravity.

not all of the potential energy of the roller coaster cars is converted to kinetic energy and back again. some mechanical energy is converted to thermal energy. describe how mechanical energy gets converted to thermal energy along the track.

Answers

This statement is true. Not all of the potential energy of the roller coaster cars is converted to kinetic energy and back again, some mechanical energy is converted to thermal energy.

The amount of mechanical energy in the system is reduced as a result of the force of friction acting on the moving automobiles. Consequently, the mechanical energy is not wasted.

It is converted into thermal energy, which is discernible as an elevation in the track and car wheels' temperature on a roller coaster.

The coaster's kinetic energy turns back into potential energy when it climbs one of the subsequent, smaller hills after the initial lift hill.

In this manner, the track's route continuously transforms energy from kinetic to potential and vice versa.

A portion of the energy is always converted into thermal energy whenever this occurs. Friction is a source of heat energy. Frictional energy is not usable energy. It isn't put to use for labor.

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Where in electromagnetic spectrum is the infrared found?

Answers

Infrared rays are located in the electromagnetic spectrum between radio waves and gamma waves.

Electro magnetic radiation travels in waves, just like waves in an ocean. The energy of the radiation depends on the distance between the crests (highest points) of the waves, or the wavelength. In general, the smaller the wavelength, the higher the energy of the radiation. Gamma rays have wavelengths less than ten trillionths of a meter which is about the size of the nucleus of an atom. This means that gamma rays have very high energy.

Radio waves, on the other hand, have wavelengths that range from less than one centi-meter to greater than 100 metres. The energy of radio waves is much lower than the energy of other types of electro magnetic radiation. The only type of light detectable by the human eye is visible light. It has wavelengths about the size of a bacteria cell and its energies fall between those of radio waves and gamma rays.

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the choices below each describe the appearance of an h-r diagram for a different star cluster. which cluster is most likely to be located in the halo of our galaxy?

Answers

The cluster that is most likely to be located in the halo of our galaxy is the diagram that shows main-sequence stars of every spectral type except O, along with a few giants and supergiants.

What are star clusters?

Star clusters are large collections of stars. Star clusters are classified into two types: Globular clusters are gravitationally bound groups of tens of thousands to millions of old stars.

Because of their location on the dusty spiral arms of spiral galaxies, they are sometimes referred to as galactic clusters. Stars in an open cluster share a common ancestor as they all formed from the same massive molecular cloud.

A typical spiral galaxy has a faint, extended stellar halo. A stellar halo is an essentially spherical population of stars and globular clusters thought to surround most disk galaxies and the cD class of elliptical galaxies. It should be noted that a halo is a spherical cloud of stars surrounding a galaxy. Astronomers have proposed that the Milky Way's halo is composed of two populations of stars.

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In a binary-star system that produces a nova, the white dwarf pulls matter from the companion star. The matter forms an accretion disk that orbits the white dwarf. Then a specific sequence of events must take place for a nova event to occur Rank the steps leading up to the observed nova event in chronological order from first to last. Material accumulates onto Nuclear fusion reactions cause the white dwarf's surface increasing in temperature At a temperature of 10 million K, the accumulated surface hydrogen begins nuclear fusion As nuclear fuel is burned up or blown into space, fusion ceases and the star dims

Answers

The density and temperature of the material accumulating on the surface of the white dwarf rise. The collected surface hydrogen starts to undergo nuclear fusion at a temp of 10 million K.

How essential is nuclear fusion, and what is it?

The Sun gets its energy through a process known as nuclear fusion. Since the 1960s, scientists have been working to duplicate it on Earth from more than 50 different nations. They are hopeful that it will someday supply the entire planet with copious amounts of renewable energy.

Has nuclear fusion ever been accomplished?

In a feat lauded by US officials as a "landmark achievement" and a "milestone for the future of clean energy," researchers at Walter Livermore National Laboratory's Nat'l Ignition Facility successfully produced a nuclear fusion reaction that resulted in a net energy gain.

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Do injuries heal faster when sleeping?

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Yes, injuries heal faster when sleeping. Sleep helps in ensuring proper blood flow on all over the body.

A decent night's rest can work on your temperament, assist you with remaining caution and lift your memory. Presently information show that getting sufficient Z's strength additionally get your slices to recuperate all the more speedily. As a matter of fact, rest was a higher priority than great sustenance in speeding wound mending.

This wasn't the very thing researchers had expected to see. They had wanted to show that giving individuals a dietary lift would make their skin wounds recuperate quicker — even in individuals who were sleepless. That would have been helpful for troopers in battle, or for specialists working long changes in a medical clinic. The researchers figured it ought to work since great sustenance keeps the body's insusceptible framework solid. That safe framework helps fix wounds and makes preparations for contamination.

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A moving electron has a kinetic energy k1. After a net amount of work is done on it, the electron is moving one-quarter as fast in the opposite direction. What is the work done w in terms of k1?.

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The work done w in terms of K₁ is (9/16)K₁..Work done is equal to change in kinetic energy of the body.

Since, it is given a electron is moving with Kinetic energy. We know that kinetic energy of any moving body is given by=(1/2)mv²

where m is defined as the mass of the body

and v is defined as the velocity of the body.

Initially K₁.=(1/2)[tex]m_e[/tex]v²

=>v²=2 K₁ / [tex]m_e[/tex]

=>v=√(2 K₁ / [tex]m_e[/tex])--------(eq1)

Now,velocity of body becomes one plus one-fourth of the above velocity,so new velocity is =[√(2 K₁ / [tex]m_e[/tex]) + [(1/4)×√(2 K₁ / [tex]m_e[/tex])]=(5/4)×√(2 K₁ / [tex]m_e[/tex].

Therefore, we know that work done is equal to change in kinetic energy of the body

=>W=(1/2)×[tex]m_e[/tex]×(v₂²-v₁²)

=>W=(1/2)×[tex]m_e[/tex] × ([(5/4)²×√(2 K₁ / [tex]m_e[/tex].)²- (√(2 K₁ / [tex]m_e[/tex]))²]

=>W=(1/2)×[tex]m_e[/tex] ×[(25/16)-1]×(2 K₁ / [tex]m_e[/tex].)

=>W=((25-16)/16)×K₁

=>W=(9/16)×K₁

Hence, work done in terms of K₁  is (9/16)K₁.

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Need help! Thanks lots!

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In order for the law of conservation of momentum to be true there should not be any external forces acting on the system.

What is the law of conservation of momentum ?A preserved quantity is one that remains constant. Many conserved values exist in physics, and they are frequently useful for formulating system predictions in extremely complex settings. The Law of Conservation of Momentum states that momentum for a system is conserved, however there is a catch. This law only applies to isolated systems. This means that no external pressures should be acting on the system. When no external forces apply on a system, the momentum is conserved, according to the law of conservation of momentum.Specifically, the system's total momentum remains constant before and after any occurrence.What is momentum ?Momentum is a vector quantity that is defined as the product of an object's mass and velocity. Because momentum is a vector quantity, it has both direction and magnitude, and it is expressed as  p = m × vWhere,                                                                                                           p = momentum.                                                                                      m = the object's mass                                                                               v = accelerationThere are two types of momentum present:Momentum LinearMomentum Angular

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after the galileo orbiter detected something unusual in the space around europa, what did scientists interpret this phenomenon to mean?

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Scientists interpreted this phenomenon to mean that there may be an underground ocean of liquid water on Europa.

The Galileo orbiter detected a magnetic field near the moon that was inconsistent with what scientists would expect from a moon made of solid rock and ice. This led them to hypothesize that a salty ocean of liquid water may be hidden beneath Europa's icy crust.

1. The Galileo Orbiter detected a powerful and localized magnetic field emanating from the surface of Europa.

2. Scientists hypothesized that this localized magnetic field was caused by the interaction between Europa's subsurface ocean and the magnetic field of Jupiter.

3. Scientists theorized that the magnetic field was evidence of a salty, liquid ocean beneath the moon's icy crust.

4. This ocean is thought to be at least twice the volume of all the Earth's oceans combined.

5. The presence of liquid water in such a large volume is a promising sign for the possibility of life on Europa.

6. This is because liquid water is necessary for life as we currently know it, and the presence of a heated ocean beneath the surface of Europa could provide the necessary energy and resources for life.

The Galileo Orbiter was an unmanned spacecraft sent by NASA to explore Jupiter and its moons. It was launched in 1989 and arrived at Jupiter in 1995. It was the first spacecraft to orbit Jupiter and it made numerous discoveries, including confirming the existence of liquid oceans beneath Europa's icy surface. It also detected a magnetic field around Jupiter and studied the planet's atmosphere and radiation belts. Galileo also sent back numerous images of Jupiter and its moons, which provided new insights into their composition and structure. It operated until 2003, when it was deliberately de-orbited into Jupiter's atmosphere.

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From the point of view of conductive heat loss, which adaptations would be beneficial to animals living in extremely cold climates? (all that apply)
A. Large surface area
B. Lots of tissues, like fat, with low thermal conductivity
C. Lots of tissues, like muscle, with high thermal conductivity
D. Thick skin
E. Thin skin
F. Small surface area

Answers

The adaptive behavior that is beneficial to the animals that live in the extreme cold climates was found to be Lots of tissues, like fat, with low thermal conductivity.

define thermal conductivity ?

A material's thermal conductivity is a measure of its ability to conduct heat.

Heat transfer occurs at a slower rate in low thermal conductivity materials than in high thermal conductivity materials. Metals, for example, have high thermal conductivity and are particularly effective at transferring heat, whereas insulating materials like Rockwool or Styrofoam are the reverse. Materials with high thermal conductivity are commonly used in heat sink applications, while materials with low thermal conductivity are used as thermal insulation. Thermal resistivity is the counterpart of thermal conductivity.

Lots of tissues, such as fat, with low heat conductivity were discovered to be useful to animals living in extreme cold climates.

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photons can be produced by the impact of a high-energy electron with a target. if the electron is accelerated by a potential difference of 10.0 kv and produces a photon on impact, what is the minimum wavelength of photon?

Answers

[tex]1.24 * 10^{-10} m[/tex] is the minimum wavelength of photon.

The potential difference is ΔV = [tex]10 * 10^{3} V[/tex]

The charge on an electron is q = [tex]-1.6 * 10^{-19} C[/tex]

The change in the potential energy of a charged particle when it moves through a potential difference, ΔV, is

ΔU = qΔV

Here,

ΔU is the change in the potential energy.

q is the charge.

ΔV is the potential difference between the initial and the final position of the charge.

The change in the potential energy of the electron is:

ΔU = [tex]-1.6 * 10^{-19} * 10^{4} = -0.16 * 10^{-15} J[/tex]

According to the law of conservation of energy, the sun of the change in the kinetic and potential energy of the charge should be zero, since the electric field is conservative, and there are no other external forces.

ΔU + ΔK = 0

⇒ΔK = [tex]1.6 * 10^{-15} J[/tex]

Therefore, the kinetic energy acquired by the electron is:

Now when such an electron suddenly stops, it produces x-ray to compensate for the sudden release of energy. The maximum energy of this x-ray is equal to the kinetic energy of the electron.

K = [tex]1.6 * 10^{-15} J[/tex]

E = K

Also, the energy of an electromagnetic wave depends on its wavelength,

λ , by the following equation:

E = hc / λ

here;

h = [tex]6.626 * 10^{-34} J[/tex] is the planks constant

c = [tex]3 * 10^{8} m/s the speed of light[/tex]

Therefore, the minimum wavelength corresponds to the maximum possible energy,

E = K

hc / λ = [tex]1.6 * 10^{-15}[/tex]

λ = [tex]6.626 * 10^{-34} * 3 * 10^{8} / 1.6 * 10^{-15[/tex]

  = [tex]19.878 * 10^{-26} / 1.6 * 10^{-15}[/tex]

  = [tex]1.24 * 10^{-10} m[/tex]

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