Need help! Thanks lots!

A particular density results in a 52.02 N strain on the aluminum wire.

part of the aluminum wire

A = πd²/4 A = π x (4.6 x 10⁻³)

²/4\sA = 1.66 x 10⁻⁵ m²

The wire's mass per square meter is 2700 kg/m3 times 1.66 x 105 m2 which is 0.045 kg/m.

The aluminum wire is therefore under 52.02 N of stress at the specified density.

A straight line that passes through the center of a rounded item or form and ends at a point on the opposing edge: Radius is divided by two to get the diameter. A six-foot radius surrounds the pond.

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Because they are substantially cooler than the rest of the Sun's surface, sunspots appear dark (in visible light). However, despite their gloomy appearance, they are nonetheless quite hot.

Around 6,300 Fahrenheit (3,500 Celsius) is the temperature of a sunspot, while 10,000 Fahrenheit is the temperature of the sun's surface (5,500 Celsius). A sunspot would glow brightly if it were the only one in outer space.

The size of the average sunspot is comparable to that of our entire planet! Although sunspots can range in size from hundreds to tens of thousands of kilometers across, they do exist (many times larger than Earth).

To gauge the sun's activity, scientists calculate the total area (size) of all the sunspots that may be seen on it each day. Sunspots disappear after a while. They appear and vanish on the Sun's surface.

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The infrared radiation has longer waves than red light. It has a lower frequency and contains less energy. While ultraviolet radiation has a shorter wavelength than blue light and delivers more energy per photon than visible light. These waves move up and down faster.

Visible light neighbours on the electromagnetic spectrum are infrared radiation on one side and ultraviolet radiation on the other. Infrared has longer waves than red light and oscillates at a lower frequency and contains less energy.

Infrared radiation also known as thermal radiation is a band in the electromagnetic spectrum with wavelengths above red light between 780 nm and 1mm.

Ultraviolet radiation lies between visible light and x-rays along the electromagnetic spectrum. The range of wavelength is between 10 and 400 nanometres.

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Answer:

D

Explanation:

A black hole is not a gateway to another dimension.

It is impossible for a blackhole to devour an entire galaxy.

Black holes do exist.

Therefore, the answer is D.

Answer:

We are going to leave the quantum theory of gravitation and return to Einstein's general relativity to describe those very exotic objects that so appeal to the imagination of young people, black holes. They are objects whose gravitational attraction is so great that not even light can escape from their surface. We already know what the escape velocity is, so what we mean is that, when we calculate the escape velocity in a black hole (see the end of Topic 1) we get a value of 300,000 km/s or more.

Explanation:

Cassini recorded the water geysers at the south polar region which suggests that the particles of Saturn's E ring are provided by Enceladus.

According to research, Enceladus likely possesses hydrothermal vents that pour hot, mineral-rich water into its ocean in addition to having most of the chemical components required for life. Enceladus, which is about the same width as Arizona, has the solar system's whitest, most reflective surface.When the spacecraft Cassini did its first flyby of Enceladus, the sixth largest moon of the planet Saturn, it discovered that the magnetic field of Saturn was deflected nearby signifying the presence of an atmosphere which might be thin but still significant. Cassini also recorded the water geysers at the south polar region which suggests that the particles of Saturn's E ring are provided by Enceladus.

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The force constant of the spring is 1.81 N/m.

When all other forces acting on the mass in a damped mass-spring system are grouped together into one term denoted by F(t). The spring constant is the type of force that is required to stretch the string.

Using the relation;

T = 2π√m/k

T = period = 0.700 s

m = mass in kilograms = 0.0225-kg

k = spring constant = ?

Making k the subject of the formula;

k = 4π²m/T²

k = 4 × (3.14)² ×  0.0225/(0.700 )²

k = 1.81 N/m

Therefore, the force constant of a spring needed to produce a period of 0.700 s for a 0.0225 kg mass is 1.81 N/m.

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Time period is calculated by the formula 2π/angular frequency whereas frequency is calculated by the formula speed/wavelength

Frequency is characterized as the quantity of complete waves produces in unit time. The unit of frequency is Hertz.

It is the proportion of speed and frequency of a wave. f=v/λ , where v and λ is the speed and wavelength of light.

Time period is the important opportunity to finish a solitary wave.The unit of time period is second.

Time period is characterized by the formula, T=2π/ω=1/f, where  ω is the angular frequency of a wave and f is its frequency.

On the off chance that we know the speed and frequency of the wave previously, figuring out the frequency by the above formulae f=v/λ ,after estimation of the frequency we can gauge the time period utilizing T=2π/ω.

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.

The fission products iodine-131, cesium-134, and cesium-137 made up the majority of the radiation produced by the failed nuclear reactor. Iodine-131 is rapidly consumed through the air and has a tendency to localize in the thyroid gland, despite having a half-life of only eight days, according to UNSCEAR.

Does radiation come from nuclear fission?

Atoms split apart during nuclear fission, releasing energy in the process. Nuclear fission is used in all nuclear power reactors, and uranium atoms are used in the majority of them. In the process of nuclear fission, a neutron splits a uranium atom after colliding with it, releasing a significant quantity of energy in the form of heat and radiation.

If a fission reactor malfunctioned, what would happen?

Because of the potential for radioactive elements to escape from all containment and enter the environment, causing radioactive pollution and fallout and perhaps poisoning nearby people and animals, a meltdown is thought to be extremely severe.

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The frequency of the sound will increase as the fire truck approaches, as the sound waves are compressed together, creating a higher pitch. As the fire truck passes by, the frequency will gradually decrease, as the sound waves spread out, creating a lower pitch.

The frequency of the sound produced by a fire truck siren changes as it approaches. This is because of the Doppler effect, which states that the frequency of sound waves increases as the source of the sound approaches, and decreases as it moves away.

Step 1: When the firetruck is at rest, the sound waves emitted by the siren travel in a straight line in all directions. This means that the frequency of the sound waves heard at any given point is the same as the frequency emitted by the siren.

Step 2: As the fire truck moves closer to the observer, the sound waves leave the siren at a faster rate than when the truck was at rest. This causes the sound waves to bunch up closer together, which in turn causes the frequency of the sound to increase.

Step 3: As the fire truck continues to move closer to the observer, the sound waves continue to bunch up, resulting in an even higher frequency of sound.

Step 4: Finally, when the fire truck passes the observer, the sound waves start to spread apart again. This causes the frequency of the sound to decrease.

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A wave is the disturbance that carries energy from one place to another through matter and space.

A wave:

Wave Speed Formula:

Properties of Waves:

        The period is the reciprocal of the frequency and vice versa.

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Because there aren't any stable nuclei with 5 or 8 nucleons, heavy elements couldn't have formed shortly after the Big Bang.

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A particle with mass m is moving at a constant speed of v in a straight line via point p. With regard to the magnitude of point p, the particle has no angular momentum. The magnitude of the particle changes in sign when it passes point P.

Angular momentum, sometimes referred to as moment of momentum or rotational momentum, is the rotational counterpart of linear momentum in physics. as a result of the quantity's conservation.

In a closed system, the overall angular momentum remains constant. It is a huge physical amount. The conservation of angular momentum applies to both its direction and its amplitude. The conservation of angular momentum is responsible for the functionality of gyroscopes, rifled bullets, frisbees, bicycles, and motorbikes.

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Answer:

A stellar black hole is formed by the gravitational collapse of a massive star (greater than 30-70 solar masses) at the end of its lifetime. The process is observed as a supernova explosion or a gamma-ray burst.

Explanation:

The fraction of the ice that lies above the water is obtained as 0.11.

We know that the term density has to do with the ratio of the mass to the volume of an object. In this case we can see that the density has to be looked upon as a kind of property that we can use so as to obtain the identity of a given material.

In this case, we can see that what we have been given in each case is the specific gravity. However, the specific gravity is the ratio of the density of the object to the density of water.

Thus;

Density of ice = 0.917 g/cm^3

Density of sea water =  1.025 g/cm^3

Then we know that the fraction that is above the surface of the water can be obtained by the use of the formula;

Volume above = Density of liquid - Density of ice/ Density of liquid

Volume above =   1.025  - 0.917/ 1.025

= 0.11

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The mass and weight of object on moon is 0.0138kg  and 0.0229kg .

Since force is a vector quantity, we must consider the direction in which it acts. There are two main types of frictional force: static force (Fst) and sliding force (Fsl). Normal forces (FN) produce these forces acting perpendicular to the direction of motion, although they act in the opposite direction to the object's motion.

It is equivalent to the weight of the object plus the extra weight. For example, pushing down on a block of wood on a table increases the normal force and thus the frictional force.

me=12Kg

ge=10

gm=10/6= 1.66

M=?

me ge =M gm

M=me ge/gm

M=120/1.66

M=0.0138kg

W=mg =0.0138 x 10kg

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The different types of radiation in electromagnetic spectrum are compared by the amount of energy found in the photons.

Radio waves have photons with low energies, microwave photons have a little more energy than radio-waves. Infrared photons still have more energy, then comes visible, ultraviolet, x-rays and the most energetic of all, gamma rays.

The energy associated with electromagnetic radiation is proportional to frequency and inversely proportional to wavelength. So, electromagnetic waves with shorter wavelengths have more energy.

On one end of the electromagnetic spectrum are radio waves, which have wavelengths billions of times longer than those of visible light. On the other end of the spectrum are gamma rays with wavelengths billions of times smaller than those of visible light.

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The total distance  of the particle is 7.33

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The distance between two sites is the length of the route. The metric unit of length is the metre.

It's interesting to observe that while some physics symbols, like "d" for distance, are extremely relatable, others, like "c" for light speed, are not.

The distance formula is a formula used to determine how far apart two places are from one another. The dimensions of these points are unlimited.

Given,

Distance s = ∫03It2 - 6t + 8Idt

= ∫02(t2 - 6t + 8)dt + ∫23(6t - t2 - 8)dt

= (t3/3 - 3t2 + 8t)02 + (3t2 - t3/3 - 8t)23

=(8/3 - 12 + 16) + (27 - 9 - 24) - (12 - 8/3 - 16)

= 20/3 - 6  + 20/3 = 22/3

=7.33

Therefore the total distance is 7.33

The complete question is : A particle travels along the x-axis so that at time t≥0 its velocity is given by v(t)=t2−6t+8. What is the total distance the particle travels from t = 0 to t = 3?

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the momentum of a car with a mass of 2,000 kg moving at a constant velocity is 40,000 kg. m/s

The kinetic energy is 400kJ

The kinetic energy is

K.E=(1/2)mv2

The mass is m = 2000kg

The velocity is v = 20ms−1

So, K.E = (1/2)x2000x202 = 400000J = 400kJ

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work. After work has been done, energy has been transferred to the object, and the object will be moving with a new constant speed.

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77,985.92 N/m^2  pressure is exerted on the record in n/m2

Equation: Pressure, P = Force, F / Surface Area, A

Force, F = Weight, mg = 1/1000*9.81 = 9.81 * 10-3 N

Surface area, A = πr^2

= π*(0.200 / 1000)^2

= 1.2566 * 10-7 m2

P = F / A = (9.81*10^–3)/(1.2566*10^–7) = 77,985.92 N/m^2 as a result.

The normal force exerted by the record is supporting the needle of the record player, and this normal force will be equal to the force of gravity pulling the needle downward. If we were to look at the end of the needle, its radius would be a circle with a radius of 0.200 millimeters. Since the prefix "milli-" indicates times 10 to minus 3, we will translate that into 0.200 times 10 to minus 3 meters.

And since this region of the circle will be r squared, we can calculate the pressure at that point. The force per area, or mg, is what determines pressure. Therefore, mg equals the force, and r squared equals the area. Therefore, the pressure equals 7.80 times 10 to the 4 pascals, or 1.00 times 10 to the minus 3 kilograms times 9.80 newtons per kilogram divided by times its radius in meters squared.

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The quantity of heat needed to increase a substance's temperature by one degree Celsius per gramme is known as its specific heat capacity. As a result, the relationship between enthalpy and a substance's specific heat capacity is direct.

Describe enthalpy.

The term "enthalpy" is essentially used in thermodynamics to show the total energy that a substance possesses. Enthalpy mathematically directly correlates with a substance's specific heat capacity.

The Gibbs free energy is reduced by temperature and entropy. Spontaneity is boosted by favourable enthalpy shifts. Spontaneity is increased by positive entropy changes. Positive entropy changes are present in all spontaneous chemical reactions. As a result, the relationship between enthalpy and a substance's specific heat capacity is direct.

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Apmlitutde for the system will be [tex]A = A_{o}e^{\frac{-bt}{2m} }[/tex].

Simply said, a spring-mass system is a spring system with a block hanging or fastened to the free end of the spring. The period of any item moving in a simple harmonic motion may often be determined using the spring-mass system. There are several other uses for the spring-mass system. For instance, the spring-mass system may be used to replicate foot skin deformation and the action of human tendons using computer images.

In a closed environment, a spring with mass m and spring constant k exhibits a straightforward harmonic motion.

T = 2π √m/k

It is obvious from the aforementioned equation that neither gravitational acceleration nor amplitude affect the oscillation's period. Furthermore, the period of oscillation cannot be changed by a constant force. While this is happening, the length of time directly relates to the mass of the body that is attached to the spring. If you connect a hefty object to it, it will oscillate more slowly.

Apmlitutde for the system will be [tex]A = A_{o}e^{\frac{-bt}{2m} }[/tex].

Where, A = Amplitude of oscillation

b = Decay constant

m = mass

t = time

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The two stars in the constellation orion, rigel with an apparent magnitude of 0.18 and saiph with an apparent magnitude of 2.07 and Brightest Star is rigel.

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The frequency of 2 waves per second is 0.5Hertz.Frequency is measured in Hertz.

Frequency implies the amount of cycles in a particular unit of time. The legitimization for why the sky is blue or anything contains assortment can be successfully figured out by it. Besides, it can similarly get a handle on why the voice of specific individuals is significant while for others it isn't significant. Similarly, Frequency plays a significant impact on the notes of a piano or different instruments.

This number of occasions is irrefutably a crucial property of a wave. The waves include people reliably. Besides, light is an electromagnetic wave and the fan is a sound wave. A wave is clearly a vibration and conveys energy with it. For the most part basic, the amount of waves passing by each second insinuates the repeat of the wave. Additionally, its assessment occurs in Hertz (Hz).

We know a formula

Frequency=1/Time period

=>v=1/T

Putting the values, we get

=>v=1/2

=>v=0.5/sec or

v=0.5Hz.

Hence, frequency of wave is 0.5Hz.

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Ac rock with a mass of 525 g in air is found to have an apparent mass of 372 g when submerged in water mass, in grams, of water is displaced 153 g

When the rock is submerged into the water, there are two forces acting on the rock:

- its weight, equal to W = mg  (m=mass, g=acceleration of gravity), downward

- the buoyant force, equal to B = mwg (mw=mass of water displaced), upward

So the resultant force, which is the apparent weight of the rock (W'), is

W' = W - B

which can be rewritten as

m'g = mg - mwg

where m' is the apparent mass of the rock. Using:

m = 540 g

m' = 372 g

we find the mass of water displaced

mw = m - m' = 525g - 372g = 153g

=mass, in grams, of water is displaced 153 g

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The following series from low frequency to high frequency are:

Radio waves-cellphone-television waves-infrared light-x-rays- black light-nuclear energy-visible light-gamma rays

In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration. See also basic harmonic motion and angular velocity.

The frequency is 2 per second if the period, or time interval, needed to complete one cycle or vibration is 1/2 second; it is 100 per hour if the duration is 1/100 of an hour. The reciprocal of the period, or time interval, is typically the frequency.

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The speed of a transverse wave on the rope is  16.359 m/s

The tension in the rope will be equal to the weight of the hanging mass:

T = mg = (1.5 kg)(9.81 m/s)

T = 14.72 N

Now, the speed of the transverse wave on the rope is given by the following formula:

V = [tex]\sqrt{T/μ}[/tex]

where,

v = speed = ?

μ = linear mass density = 0.0550kg/m

Therefore,

V = [tex]\sqrt{14.72/0.0550}[/tex]

V = 16.359 m/s

A wave that oscillates perpendicular to the direction of the wave's advance is said to be transverse. Comparatively, a longitudinal wave moves in the direction of its oscillations. Transverse waves include those in the water.

A straightforward illustration may be seen in the waves that can be made on a horizontal length of string by anchoring one end and moving the other end up and down. The waves made on a drum's membrane are another illustration. The directions in which the waves travel are parallel to the membrane plane, yet the membrane's individual points move up and down in directions that are perpendicular to that plane. Another example of a transverse wave with oscillations that are not periodic is light.

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(A) The pressure drop according to Bernoulli's equation is 1207.811 KPa.

(B) The maximum height nozzle can rise is 0.120 m.

In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.

The total energy in the flow is generally tracked by Bernoulli's equation. Bernoulli's equation maintains track of how energy changes between potential energy, pressure energy, and velocity energy throughout the flow since energy cannot be generated or destroyed.

Given,

Diameter of fire hose = 8.4 cm

Diameter of nozzle = 2.2 cm

Since nozzle and hose are at same level so

h1 = h2

Applying Bernoulli's equation, we get

P1 + (1/2)ρv₁² + ρgh₁ = P₂ +(1/2)ρv₂² + ρgh₂

Solving further, we get

P₁ - P₂ = (1/2)ρ(v₂² - v₁²)

We also know that discharge is

Q = AV

so

V = Q/A

Substituting Q/A in this equation

P₁ - P₂ = (1/2)ρ(v₂² - v₁²)

P₁ - P₂ = (1/2)ρ(49.729² - 7.573²)

P₁ - P₂ = 1207.811 KPa

The pressure drop is 1207.811 KPa.

B

The maximum height attained

P₁ - P₂ = h*d*g

1207.811 KPa = h * 1000*10

h = 0.120 m

The maximum height nozzle can rise is 0.120 m.

Therefore, using Bernoulli's equation we got to know the pressure drop and the maximum height.

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The black hole in our galactic center has an event horizon's size increases linearly with the mass of the black hole; a black hole with a solar mass of 10 would have an event horizon of 30 km.

The radius of a black hole increases with its mass. For the Sun or any object with a solar mass of one, the event horizon is 3 km (a little under two miles).

The matter will be broken down into its tiniest subatomic pieces once it enters the black hole's event horizon and finally be compressed into the singularity. The event horizon of the black hole grows proportionally as more matter is drawn into the singularity.

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1.478 cm is the wavelength of this sound.

The separation between neighboring identical portions of a sound wave is consequently known as its wavelength. The separation between adjacent compressions in a sound wave is equal to one wavelength, just to the distance between adjacent crests in a transverse wave.

There are three types of sound waves: pressure waves, mechanical waves, and longitudinal waves.

We know that,

wavelength and frequency of sound are related with the relation,

λ = v/f

Given,

velocity of sound in air (v) = 340 m/sec = 34000 cm/sec

frequency (f) = 23 KHz = 23 × 10³ Hz

or, λ = (34000 cm/sec) / (23 × 10³)

or, λ = 1.478 cm

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