A moving object's kinetic energy is inversely correlated with its mass and inversely correlated with the square of its speed.
What is the impact of mass on kinetic energy?If all other variables are maintained constant, mass and kinetic energy have a positive relationship, which indicates that as mass grows, kinetic energy increases. Accordingly, an object with the same mass and speed as another object will have twice the kinetic energy, and another object with the same mass and speed as another object will have four times the initial kinetic energy.
It is more difficult to move and stop heavier objects (i.e., items with more mass). Greater mass, or heavier items, resist change more than lighter ones do. Using a bicycle or a Cadillac while being pushed, or stopping them once they are moving. The difficulty of starting or stopping an object increases with its mass (or inertia).
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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?.
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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what is the maximum acceleration of a platform that oscillates at amplitude 2.20 cm and frequency 6.60 hz?
The maximum acceleration of the platform that oscillates at amplitude 2.20 cm and frequency 6.60 hz is 37.8 m/s^2
The acceleration amplitude is [tex]a_{m}[/tex]=ω²[tex]x_{m}[/tex] , where ω is the angular frequency (ω=2πf ).
The equation a = v/t denotes acceleration (a), which is the change in velocity (v) over the change in time (t). This enables you to calculate the change in velocity in metres per second squared (m/s2).
Since there are 2π radians in one cycle.
Therefore, in this circumstance, we obtain
a=ω²x = (2πf)² x = (2π (6.60))² (0.0220) m = 37.8 m/s^2
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In a tug of war, when one team is pulling with a force of 200 N and the other 80N,
what is the net force
Answer:That depends on whether both people are pulling in the same direction against a fixed object or pulling against each other. If pulling in the same direction, the total force is 300 N + 300 N = 600 N. If the two people are pulling against each other, the total force is 300 N in the rope is 300 N, or a net of zero.
Explanation:.
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This model represents light. What does this model show?
A. A single light wave traveling in a circle around a source
B. A single light wave traveling away from a source
C. Many light waves traveling in all directions from a source
D. Two light waves traveling perpendicular to a source
The model of the light wave shows many light waves traveling in all directions from a source.
option C is the correct answer.
What is the motion of waves?Wave motion is the transfer of energy and momentum from one point of the medium to another point of the medium without actual transport of matter between two points.
The following explanation illustrates how light waves can travel. Light propagates as electromagnetic waves. Light can travel in all all directions as light waves are spherical waves which travel radially outwards from its source.
From the given image we can conclude the following;
there are many light waves since there are many circular wave form producedall the light waves emanates from a sourceThus, it is safe to say that the model of light being represented shows many light waves travelling from a single to many direction due to presence of many circular wave path shown in the picture.
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What is the amount of energy transferred by a force acting through a distance called?
The amount of energy that is transferred by a force acting through a distance is known as work.
If we apply a force on an object, this force transforms into kinetic motion and distance is moved by the object. When there is displacement due to this force, work is said to be done.
Work is actually the transfer of mechanical energy from one substance to another. As work is the result of the transfer of energy, it has the same unit as energy, i.e., joule.
When work is done, the kinetic energy of the object is changed, or it has altered potential energy. Potential energy may change into kinetic energy due to the application of force. If position or shape is changed due to force, then we have altered potential energy.
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An electric dipole with its center located at the origin of a Cartesian coordinate system oscillates along the x axis, creating an electromagnetic wave.
a. At a position on the z axis far from the origin, what is the polarization of the wave?
b. At a position on the axis far from the origin, what is the polarization of the wave?
The wave moves in a z-direction. Along the x-axis, there is linear polarization.
When a dipole oscillates, the two charges that make up the dipole move back and forth along the line connecting them, first getting closer and then getting further apart.If the electric field oscillates along the x-axis and the wave propagates along the z-axis, then when the charges oscillate they create a fluctuating wave that propagates in the opposite direction of the oscillation of the charges.As the electric field is directed from one charge to another in a dipole, it oscillates on the x-axis, and the polarization of the electric wave is also on the x-axis because of this. The polarization is linearly polarized along the x-axis and the wave propagates along the z-axis.
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During a classroom lab activity, students built each of the circuits shown below and measured the current and resistance in each circuit. Each circuit contains a 1. 5-volt battery and each bulb has a resistance of 50 Ω.
When the switch is closed, in which circuit would resistance be the highest and current be lowest?
Circuit 2 would have the highest resistance and lowest current when the switch is closed.
This is because Circuit 2 has two bulbs in series, meaning that the current must pass through both bulbs to complete the circuit. This increases the overall resistance of the circuit, resulting in a lower current.
Note: This assumes that the other conditions, such as the size and quality of the bulbs and the battery, are the same in all of the circuits. If these conditions change, the resistance and current in the circuits may also change.
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water flows from a narrow pipe into a wider one. the speed of the water in the wide pipe is measured to be 1/9 of what it is in the narrow pipe. how do the diameters of the pipes compare?
The wide pipe's diameter is three times greater than that of the little pipe.
Consider a thin pipe with width r1 and a wide pipe with dimension r2, where v * pi * r12 = v/9 * pi * r22 r12/r2
The wide pipe has a diameter that is three times greater than the narrow pipe because
r1^2/r2^2 = 1/9
r1/r2 = 1/3
We could have the pipe sloping upwards, to make one more straightforward generalization. The fluid would thus gain potential energy in addition to kinetic energy, increasing the work required of the pressure. The increase in potential energy in time t will be (A 1v1t)g(h2h1) if we assume that the center of the area A1 is at height h1, the area A2 is at h2, and we take t to be very small. This changes Bernoulli's equation. Because the flow rate of water in the narrow pipe is higher than the flow rate of the fault in the broad pipe, the pressure drops when water flowing through a broad pipe and into a narrow pipe.
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the siren of a fire engine that is driving northward at 40 m/s emits a sound of frequency 1500 hz. a truck in front of this fire engine is moving northward at 25 m/s. what is the frequency of the sound that the truck driver hears? assume the speed of sound in air is 343 m/s.
The frequency of sound that the truck driver hears is 1428.57 Hz.
Velocity of the fire engine = V = 40 m/s
Frequency of sound emitted by fire engine = F = 1500 Hz
Velocity of the truck = v = 25 m/s
Frequency of sound that the truck driver listens to = f =
= f = [( V' - V) / (V' - v )} X F
= f = [(343 - 40) / (343 - 25)] X 1500
= f = (303 / 318 ) X 1500
= f = 0.95 X 1500
= f = 1428.57 Hz
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suppose a piece of dust finds itself on a cd. if the spin rate of the cd is 500 rpm, and the piece of dust is 3.80 cm from the center, what is the total distance traveled by the dust in 2.90 minutes? (ignore accelerations due to getting the cd rotating.)
The distance traveled by dusk is 338.2m.
The rate of change of angular displacement is known as angular speed. The radian per second is the unit of angular speed. Both angular speed and angular velocity are represented using the same formula. Angular velocity is a vector term that describes both magnitude and direction, whereas angular speed describes magnitude.
The scalar measure of the rotation rate is angular speed. The angular distance traveled in one complete rotation is 2 and the time period is (T).
Because the spin rate of the CD is 500 rpm, or revolutions per minute, its angular speed in rad per second equals
w = 500 rev/min * 2π rad/rev * 1/60min/sec
w = 52.36 rad/s
Because the dusk is 3.80 cm from the center, its velocity must be
v = Rw =
v = 3.8 * 52.36
v = 198.97 cm/s
After 2.90 minutes, or 170 seconds, the distance traveled by dusk is
d = v*t
d = 198.97 * 170
d = 33824.9 cm
or
d = 338.2m
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if the old radiator is replaced with a new one that has longer tubes made of the same material and same thickness as those in the old unit, what should the total surface area available for heat exchange be in the new radiator to achieve the necessary heat exchange rate at the recommended temperature gradient?
Total surface area = 3/2 * area of old radiator
From the question, we have
Thermal conductivity is the same in the new and old radiators
We know that,
K = Q/A*ΔT
change in T = ΔT
Using this relation, we get
New surface area = 3/2 * area of old radiator
Heat exchanger :
The heat exchanger is a device that transfers heat from one source to another to a working fluid. In both cooling and heating processes, heat exchangers are employed. To avoid mixing, the fluids may be in direct touch or separated by a solid wall. They are frequently utilized in power plants, chemical and petrochemical plants, oil refineries, sewage treatment, air conditioning, refrigeration, and space heating. In an internal combustion engine, a circulating fluid called engine coolant circulates through radiator coils as air passes by the coils, cooling the coolant and heating the incoming air. This is a classic example of a heat exchanger in action.
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two simple harmonic oscillators are constructed by attaching similar objects to two different springs. the force constant of the spring on the left is 5 n/m and that of the spring on the right is 4 n/m. if the same force is applied to both, which statement is true?
The spring on the left will oscillate faster than spring on the right. This is the true statement.
A simple harmonic oscillator is a kind of oscillator that is either damped or driven. It generally has a mass' m', where a single force 'F' pulls the mass in the trajectory of the point x = 0, and depends only on the position 'x' of the body and a constant k.
The particle's acceleration in simple harmonic motion is directly proportional to its displacement and it is directed towards its mean location.
Since the force constant for the left spring is more than the right spring, The left will oscillate faster. It has the direct relation with force constant.
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suppose you observe a star orbiting the galactic center at a speed of 1000 km/s in a circular orbit with a radius of 12 light-days. calculate the mass of the object that the star is orbiting.
The mass of the object that the star is orbiting is 7.8 x 1036 kg, or nearly 3,900,000 times that of the Sun.
The orbital velocity law will be used to determine the mass of the core black hole:
M(r)= (rv^2)/G
The star's radius and speed must be converted into meters and meters per second in order to apply this law. 1.0x106 meters per second is the speed that we determine. Since it is specified as 20 light-days, the radius requires a little more work. We may convert to light-days and discover that the orbital radius is also 2.5x10(-2) light-years since there should be roughly 365 light-days in a light-year. Because a light-year is 9.46 x 1015 meters, the orbital radius is 5.2 x 1014 meters. Our calculations lead us to the conclusion that the center black hole's mass is 7.8 x 1036 kg, or nearly 3,900,000 times that of the Sun.
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what is the term for the intrinsic property that indicates the ease with which a material is capable of allowing the flow of electric current?
Electrical conductivity is the intrinsic property that indicates the ease with which a material is capable of allowing the flow of electric current.
Why is electrical conductivity an intrinsic property?
An intrinsic attribute in materials science is independent of both the quantity and the shape of the material, such as a single huge piece or a collection of tiny particles. The basic chemical make-up and structure of the substance are the key determinants of intrinsic qualities.The capacity of a material to carry electricity is known as conductance (also known as electrical conductance). The ability of an electrical current (or flow of charge) to go through a substance is gauged by its conductance. Electrical resistance, denoted as 1/R, is the reciprocal of conductance, or its inverse.Resistance (R) and electrical conductance (G) have a reciprocal relationship: G = 1 R. Electricity's ease of movement through electrical components at a specific voltage differential is measured by electrical conductance. Siemens is the SI unit for conductivity (the older unit was the mho).
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A newly discovered planet is found to have density 2/3 pe and radius 2re, where pe and re are the density and radius of earth, respectively. The surface gravitational field of the planet is most nearly.
13 N/kg The surface gravitational field is given by acceleration due to gravity on the planet (g). Let the value of it on a newly discovered planet be g'.
What is the value of the gravitational field?The gravitational force acting on a mass of one kilogram is measured in newtons. G is assumed to be 9.806 N kg-1 at the surface of the Earth. Additionally, the acceleration of an item falling freely in the gravitational field of the Earth is denoted by the letter "g".
How does the gravitational field originate?Through the development of his theory of relativity, Albert Einstein demonstrated that gravity is a curvature in the space-time continuum rather than merely a force. Simply explained, an object's mass causes the space around it to essentially bend and curve. That may sound like it belongs in science fiction, but it's true.
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the temperature of a blackbody radiator is increased. what will happen to the most intense wavelength of light emitted as this increase occurs?
The wavelength of the most intense radiation will decrease.
What is wavelength ?
The distance between two successive crests or troughs of a wave is known as its wavelength. It is calculated using the wave's direction.
The temperature of a blackbody radiator is increased.
Most intense wavelength of light emitted as this increase occurs the wavelength of the most intense radiation will decrease
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Pace left home at 8 am to spend the day at an amusement park. He arrived at the park, which was 150 km from his house, at 10 am. Pace explained that his speed was 38 km/h, which was a/an choose. Speed, but the fastest speed he went was 60 km/h, which was a/an choose. Speed.
The speeds are average and accelerated if pace explained his speed was 38km/h and fastest speed was 60km/h.
Pace was first moving at 38 km/h which was considered as his average speed yet the fastest speed he went was 60 km/h so he accelerated up.
The average speed of a body in any particular time interval is the distance covered by the body in that time interval divided by time. So if a particle covers a certain distance s in a time Time 1 to Time 2, then the average speed of the body is. In linear motion average speed is same as average displacement as distance and displacement in linear motion is same.
average speed=total distance travelled/total time taken
Now, talking about the accelerated speed which is highest speed attained by the object in its whole journey. Accelerated speed is variable in nature it regularly decrease or increase in small span of time.
Hence, correct speed are average, accelerated.
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(Complete question) is:
Pace left home at 8 AM to spend the day at an amusement park. He arrived at the park, which was 150 km from his house, at 10 AM. Pace explained that his speed was 38 km/h, which was a/an (accelerated / directional / instantaneous / average) speed, but the fastest speed he went was 60 km/h, which was a/an (directional / instantaneous / accelerated / average) speed.
Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one’s birth. the only known force that a planet could exerts on us is gravitational, so if there is anything to astrology we should expect this force to be significant.
Calculate the magnitude of the gravitational force (in N) exerted on a 3.00 kg baby by a 110 kg father 0.150 m away at birth (he is assisting, so he is close to the child.)
The magnitude of the gravitational force exerted on baby by the father is 9724 N * 10⁻⁷ N.
Gravitational force formula is given by:
F = GMm/r²
where G = gravitational constant
M and m = masses given
r = distance given in radius
Concerning this question, we can make a substitute of the formula to be:
F(father) = G*M(father)*m(baby)/r²
F = G * (110 kg) * (3kg) / (0.150)²
Where; G = gravitational constant ⇒ 6.63 * 10⁻¹¹ Nm²/kg²
M = mass of the father ⇒ 110 kg
m = mass of the child ⇒ 3 kg
r = distance between father and child ⇒ 0.2m
Force = 6.63 * 10⁻¹¹ * 110 * 3 / (0.150)²
Force = 9724 N * 10⁻⁷ N
We can now conclude that the gravitational force exerted on the baby by the father at birth is 9724 N * 10⁻⁷ N.
Therefore, the magnitude of the gravitational force exerted on baby by the father is 9724 N * 10⁻⁷ N.
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What is the wavelength of a 5 Hz wave that travels with a speed of 10m s?
The wavelength of a 5 Hz wave is 2m that travels with a speed of 10m/s and frequency of 5Hz.
For an electromagnetic wave, we know that there is relation between speed, frequency, and wavelength which is given by
c=ν × λ
where c is defined as the speed of light in any medium,
v is defined as the frequency of the wave,
and λ is defined as the wavelength of the wave
Here c is different for different mediums. Usually in vacuum speed is very high whereas in rough surfaces speed is very low.
So, same formula is applicable to the given wave
Here speed of wave is 10m/sec, frequency of wave=5Hz and wavelength=?
So, putting the values, we get
=>10 = 5 × λ
=>λ=10/5
=>λ=2m
Hence, wavelength is 2m.
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The wind speed on Mount Washington in New Hampshire reached 372 km/h.
Suppose an experiment with a glider is being performed on top of Mount
Washington. The glider is launched by the high winds so that in 45.0 sec the
glider's speed equals the speed of the wind. Assuming that the glider is
initially at rest and that its acceleration is constant, what is the magnitude of
the glider's average acceleration?
The magnitude of the glider's average acceleration is determined as 2.3 m/s².
What is the average acceleration of the glider?
The average acceleration of the glider is the rate at which the velocity of the glider changes with time.
Mathematically, the formula for average acceleration is given as;
a = v / t
where;
v is the velocity of the glidert is the time of motion of the gliderSince the glider is launched by the high winds so that in 45.0 sec the glider's speed equals the speed of the wind.
the speed of the glider, v = 372 km/h = 103.33 m/sthe time of motion of the glider, t = 45 secondsa = ( 103.33 m/s ) / ( 45 s )
a = 2.3 m/s²
Thus, the average acceleration of the glider is a function of the speed of the glider and the duration to attain such speed.
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A gas is compressed by an isothermal process that decreases its volume by a factor of 2. In this process, the pressurea) does not changeb) increases by a factor of more than 2c) increases by a factor less than 2d) increases by a factor of 2
If the gas is an ideal gas, then the pressure will remain constant in an isothermal process. So the correct option is a.
In general, a gas is compressed by an isothermal process that decreases its volume by a factor of 2. In this process, the pressure will either remain constant (a) .
The behavior of the pressure in an isothermal process depends on the nature of the gas. If the gas is an ideal gas, then the pressure will remain constant since the temperature is constant and the ideal gas law states that pressure is proportional to the temperature. In this case, the answer would be (a).
Finally, if the gas is an ideal gas and the process is adiabatic, then the pressure will increase by a factor less than 2 (c). This is because adiabatic processes involve a decrease in temperature, leading to a decrease in pressure.
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a photographer uses his camera, whose lens has a 50 mm focal length, to focus on an object 1.5 m away. he then wants to take a picture of an object that is 30 cm away. how far
The distance the lens needed to be moved so that it can focus on the second object is 0.008 m.
From the question, it is said that focal length f = 50 mm = 50* 10⁻³ m
The lens equation is mathematically represented as
1/u + 1/v = 1/f
Given that, u = 1.5 m
1/1.5 + 1/v = 1/(50* 10⁻³)
1/v = 1/(50* 10⁻³) - 1/1.5
v = 0.052 m
Object distance u = 30 cm = 0.3 m
1/0.3 + 1/ v₁ = 1/(50* 10⁻³)
v₁ = 0.06 m
The distance the lens needed to be moved is evaluated as
z = | v - v₁ | = | 0.052 - 0.06 | = 0.008 m
The question is incomplete. The continuation of the question is 'how far must the lens move to focus on this second object?'
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an anchor rope to anchor a ship to the pier is wrapped 2 full times around a support on the ship. a deck hand can keep the rope from slipping by applying a force of 100 n to the free end. what is the coefficient of friction between the rope and the support?
The coefficient of friction is 0.34
The rope is wrapped for 2 times so, Φ = 4π
From the Capstan's equation,
T(load) = T(hold)
7000 = e^u*4π
Taking the log of both sides,
u = log7000 / 100*4π
u = 0.338
The coefficient of friction is 0.34
Coefficient of friction :
The coefficient of friction, or, is a unit used to quantify friction between two surfaces. In comparison to when the coefficient of friction is high, a low value indicates that less effort is required to generate sliding. The friction coefficient is the ratio that is used to measure how much friction there is between two objects in comparison to the normal force holding them together. When choosing materials and determining the requirements for surfaces, the coefficient of friction is a crucial factor.
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in part a, you found that planet z should not have polar ice caps or liquid water. what single change to planet z's characteristics would allow it to have these things?
A greater distance from its star can help planet z to nit have polar ice caps or liquid water.
How can distance from star prevent polar ice caps ?Polar ice caps are ice structures present in the extreme polar regions of the Earth.
These ice caps are forms because they receive less exposure to sunlight and thus water crystallizes into ice.
The distance from it's star matters because it directly correlates to the energy the planet receives from the star. If rhe distance is too far, then it’s too cold and water would freeze.
Distance from the star plays role in whether liquid water and ultimately, life as we know it, will exist on a planet. The chemical makeup of the planet and it’s ability to sustain an atmosphere also plays a huge role in determining whether liquid water could exist on a planet.
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an object with a mass m slides down a rough 37e inclined plane where the coefficient of kinetic friction is 0.20. what is the acceleration of the object?
The acceleration of the object is 9.307 m / s when the object of mass (m) slides down an inclined plane and the coefficient of kinetic friction is given.
What is the Coefficient of Kinetic friction?
The resistive force of friction (Fr), which pushes the items together, is divided by the normal or perpendicular force (N), which pushes them apart, to produce the coefficient of friction (fr), which is a numerical value. The following formula represents it: fr = Fr/N.
Calculations:
angle θ = 37°
the coefficient of kinetic friction μ = 0.20
accleration a = g sin θ - μ g cos θ
= 5.897 - 1.5653
= 4.331 m / s²
(b). length L = 10 m
initial velocity u = 0
the speed at the bottom of the plane is v
then from the relation v² - u² = 2aL
v = √[ 2aL ]
= 9.307 m / s.
Hence, the acceleration of the object is 9.307 m / s.
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What is the change in internal energy of an object if 10 J of heat is transferred into the system and 5 J of work is done by the system?
The change in internal energy is 15J when work done by system.
At the microscopic level, this form of energy includes internal kinetic energy and potential energy.
Internal kinetic energy is the sum of all kinetic energies of each system element with respect to the center of mass. (translation, rotation and vibration of atoms and electrons).
internal potential energy that is, the potential energy associated with each interaction of these elements. It relates to the static component of matter.
For example, a bottle of water at room temperature has no apparent energy. But at the microscopic level, water molecules vibrate and rotate at speeds of hundreds of meters per second.
q=u+w
u=q-w
=10-(-5)= 15J
since work done by system is negative.
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A child pulls a sled up a snow-covered hill. The child does 70 J of work on the sled.
If the child walks 17 m up the hill, how large of a force, in Newton's, must the child exert?
Answer:
Force = Work/Distance = 70 J/17 m = 4.118 N
Explanation:
i'm smart
The child must exert a force of 4.12 Newtons to pull the sled up the hill.
What is force?Force is a fundamental concept in physics that refers to a push or pull on an object. It is an interaction that can cause a change in the motion, shape, or orientation of an object. Force is a vector quantity, which means that it has both magnitude and direction.
Force is measured in Newton's (N) and is defined as the amount of force needed to accelerate a one-kilogram mass at a rate of one meter per second squared. The equation that describes force is F = ma, where F is force, m is mass, and a is acceleration.
There are several types of forces, including:
1. Contact forces: These are forces that act only when two objects are in contact with each other. Examples include friction, tension, and normal force.
2. Non-contact forces: These are forces that act even when two objects are not in contact with each other. Examples include gravity, electric force, and magnetic force.
3. Applied forces: These are forces that are directly applied to an object by a person or an external source. Examples include pushing a book across a table or pulling a sled up a hill.
4. Reactive forces: These are forces that are a reaction to an applied force. For example, if you push a wall, the wall exerts a reactive force back on you.
Understanding force is essential in many fields of science and engineering, as it helps us understand and predict the behavior of objects under different conditions.
Here in the Question,
To calculate the force exerted by the child, we can use the formula:
Work = Force x Distance x cos(theta)
Where:
Work = 70 J
Distance = 17 m
cos(theta) = 1 (assuming the force is exerted in the same direction as the displacement)
Plugging in the values, we get:
70 J = Force x 17 m x 1
Solving for Force, we get:
Force = 70 J / 17 m
Force = 4.12 N
Therefore, the child must exert a force of approximately 4.12 Newtons to pull the sled up the hill.
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A man weighing 800 newtons is standing on a chair. In order to support the man, the chair is exerting a force of.
The chair is exerting a force of 800N.
Force is a quantity that is used to describe the interaction between two objects. Forces can cause objects to accelerate, decelerate, or change direction. In other words, forces can cause objects to move or change the way they are moving. The weight of an object is a measure of the force of gravity on that object and is calculated by multiplying the object's mass by the acceleration due to gravity.
In the given case, It would need a force equal to his weight (800 N) pressing in the opposite direction for the man to be able to rise up in the chair. Therefore, the 800 N force would be pushed upwards if he were to press down by standing on it.
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a beam of white light goes from air into water at an incident angle of 75o. at what angles are the red (660 nm) and violet (410 nm) parts of the light refracted? (nwater(red)
Red light (660 nm) has a refraction angle of about 43.6°, while violet light (410 nm) has a refraction angle of around 58.3°.
What angles do the red (660 nm) and violet (410 nm) components of light undergo refractive distortion?Dispersion is the process by which light of various hues refracts at various angles as it travels through a medium. The wave theory of light can be used to explain this occurrence.According to the wave theory of light, light is a wave rather than a particle, and the medium it travels through affects both its speed and wavelength. Light's speed drops when it travels through water, which causes it to refract at a different angle. The wavelength of the light affects the angle of refraction.The red light (with a wavelength of 660 nm) will refract at a larger angle than the violet light in the scenario where the white light enters the water at an incidence angle of 75o (with a wavelength of 410 nm).Snell's law, which states that the ratio of the refraction indexes equals the sine of the incident and refracted angles, can be used to determine this. In this instance, the water has a red light index of refraction of 1.33 and a violet light index of refraction of 1.34.We may determine the angle of refraction for red light as 81.45 using Snell's law.To learn more about the wave theory of light refer to:
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if the force constant of the spring is 3000 n/m , her mass is 69 kg , and the amplitude of her oscillation is 1.9 cm , what is her maximum speed during the measurement?
The maximum speed of an astronaut is 12.5cm/s.
If, the astronaut uses body mass measurement device to measure her mass, then the speed can be calculated easily.
How to calculate speed of an astronaut in space?By differentiating angular frequency, and displacement of mass with respect to time, then speed can be calculated.
Calculation:We know,
Force constant of the spring, k = 3000 N/m
Mass of an astronaut, m = 69 kg
Amplitude of the oscillation, x max = 1.9cm = [1.9 cm]*[1 m/100 cm] = 0.019m
We need to find the vmax.
The angular frequency ω is given by,
ω = √[k/m]
The displacement of the mass m from the men position in case of simple harmonic motion is given by,
x = xmax*cos[ωt + φ]
Differentiating above relation with respect to time we get the velocity of the object at any time t during the motion.
v = -ω*xmax*sin[ωt + φ]
v = - vmax*sin[ωt + φ]
Here we have the velocity amplitude {maximum velocity} vmax given as
vmax = ω*xmax
vmax = √[k/m]*xmax
vmax = √[(3000 N/m)/(69kg )]*[0.019 m]
vmax = 0.125m/s
vmax = 12.5 cm/s
Hence the maximum speed of an astronaut is 12.5cm/s
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