PHYSICS MIDDLE SCHOOL

When a wave enters a medium and changes into another form of energy, usually TE, This is called:a. absorption
b. transmission
c. reflection
d. refraction
When a wave enters a medium and changes into another - 1

Answers

Answer 1
Answer:

Answer:

transmission hope this helps
Answer 2
Answer: The answer is b. Transmission

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A mass of gas under constant pressure occupies a volume of 0.5 m3 at a temperature of 20 degree Celsius. Using the formula for cubic expansion, what will be the volume at a temperature of 45 degree Celsius without a change in pressure?A) 0.5228938 m3 B) 0.0228938 m3 C) 0.5457875 m3 D) 0.0457875 m3

What effect would the temperature have on the time kept by a pendulum clock if the pendulum rod increase in length with an increase in temperature

Answers

As we know the time period of pendulum is given by the equation

T = 2\pi \sqrt{(L)/(g)}

so here

L = length of the pendulum

Now on increasing the temperature due to thermal expansion the length of the pendulum will increase and due to this the time period of the pendulum will also increase

Now due to increase in time period of the pendulum the clock will become slow and it will give incorrect time due to this increase in temperature

Thermal expansion increases the pendulum period, and the clock will lose time

Further explanation

Simple Harmonic Motion is the motion of an object (repetitive movement) through its equilibrium point where the frequency of vibrations / oscillation per second is constant

The motion that occurs in the pendulum is one example of simple harmonic motion

Terms used:

  • Deviation (y): the object's distance from the balance point
  • Amplitude (A): maximum deviation
  • frequency (f): number of vibrations at any time
  • Period (T): the amount of time in one vibration

Whereas the relationship T and f:

\displaystyle T=(1)/(f)\n\nf=(n)/(t)

n = number of vibrations / oscillation

t = time (s)

Formula used:

\large{\boxed{\bold{T=2\pi \sqrt{(L)/(g) }}}\rightarrow (1)/(f)=2\pi \sqrt{(L)/(g) }

From this formula shows that the period is proportional to the length of the pendulum rod.The longer the pendulum rod , the greater the amount of time in one vibration

If thermal expansion occurs in the pendulum clocks, the pendulum rod changes in length ,proportional to the temperature change, and increases the pendulum period, so the clock will lose time

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the average velocity  

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6. A golf ball is hit a distance of 300 yards in 10 sec. What is the speed of the golf ballo

Answers

The speed of the ball is 27.4 m/s

Explanation:

The speed of an object is given by:

speed=(d)/(t)

where

d is the distance covered

t is the time taken

In this problem, we have:

d = 300 yards is the distance covered by the golf ball

t = 10 s is the time taken

Keeping in mind that

1 yard = 0.914 m

We can convert the distance from yards to meters:

d = 300 \cdot 0.914 = 274.2 m

And substituting into the equation, we find the speed of the ball:

speed=(274.2)/(10)=27.4 m/s

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What effect does solar radiation have on climate when comparing the equator to polar- regions?

Answers

Answer:

The solar radiation is one of the main factors that shapes the climate all over the globe, so the climate differs with the less or more solar radiation it gets. The polar regions are cold, this is due to the fact that the solar radiation in here is very obscure, because the solar radiation falls at a very wide angle the heat is dispersed over larger area, thus the land gets very little warmth. The Equator, on the other hand, gets direct solar radiation, the sun light falls at a 90 degrees angle or close to it, so the radiation is more concentrated on a smaller area, thus the warming is bigger.

* hopefully this helps:) Mark me the brainliest:)!!!

What is the force of gravity (from the Earth) on the 700kg satellite if it’s 10km above the Earth's surface?

Answers

Answer:

g = 4.7 × 10^(-16) m/s^(2)

Explanation:

Given that the mass of the satellite = 700 kg, and 10,000 m above the earth;s surface.

From Newton's second law,

 F = mg ............... 1

From Newton's gravitation law,

F = (GMm)/(r^(2) ) .................. 2

Where: F is the force, G is the gravitational constant, M is the mass of the first body, m is the mass of the second body, g is the gravitational force and r is the distance between the centers of the two bodies.

Equate 1 and 2 to have,

mg = (GMm)/(r^(2) )

⇒   g = (GM)/(r^(2) )

But; G =  6.67 × 10^(-11) N m^(2) Kg^(-2), M = 700 Kg, r = 10000 m

Thus,

g = (6.67*10^(-11*700) )/(10000^(2) )

  = (4.669*10^(-8) )/(1*10^(8) )

  = 4.669 × 10^(-16) m/s^(2)

The force of gravity on the satellite is 4.7 × 10^(-16) m/s^(2).

The force of gravity on a 700kg satellite 10km above the Earth's surface can be calculated using the equation F = mg.

The force of gravity on an object is given by the equation F = mg, where F is the force of gravity, m is the mass of the object, and g is the acceleration due to gravity.

On Earth's surface, the acceleration due to gravity is approximately 9.8 m/s^2. However, as the satellite is 10 km above the Earth's surface, the force of gravity will be slightly less than that.

To calculate the force of gravity on the satellite, we can use the equation F = mg. Substituting the mass of the satellite (700 kg) and the acceleration due to gravity (9.8 m/s^2 - (9.8 m/s^2 * (10 km/ 6371 km))), we can find the force of gravity.

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What factors affect the speed of a wave?

Answers

Speed of wave depends mainly on four factors. These factors are wavelength, frequency, medium and temperature.

We know from laws of refraction, when a wave travels from rarer to denser medium, the speed of wave slows down. And when it travels from denser to rarer, it speeds up.

The relation of speed of wave with its wavelength and frequency is given by the following:

v = \lambda * f

The speed of a wave in a particular medium remains constant. A higher frequency wave has shorter wavelength.

The speed of a wave also varies with temperature in a given medium. temperature affects the density of the medium and vibrations of the medium particles. Higher the temperature, higher is the speed of wave.

The factors that affect the speed of a wave are wavelength and medium.  The correct option is B.

Wavelength and the characteristics of the medium a wave travels through are the two key parameters that affect a wave's speed.

Wavelength is the separation between successive wavepoints, and medium is the substance or material through which the wave is travelling, such as air, water, or solids.

The speed of the wave typically decreases as the wavelength rises. Additionally, the densities, compositions, and properties of various media can vary, which has an impact on how quickly a wave can go through them.

For instance, sound waves move through the air more quickly than they do through water. In disciplines like physics, acoustics, and communications, having an understanding of these elements is essential.

Thus, the correct option is B.

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Your question seems incomplete, the probable complete question is:

What factors affect the speed of a wave?

A) Amplitude and frequency

B) Wavelength and medium

C) Temperature and pressure

D) Velocity and direction

How dose a black hole form.

Answers

Black Hole

___________

It is the most mysterious thing in our universe.

✳ John Michell was the first scientist who gave his idea on black hole in 1783

✳ later than Pière simon described black holes in his book the system of the world in 1796.

What are black holes?

=>  It is also a celestial body which have infinite gravitational force and infinite mass and even light can not escape from it.

=> If any object goes near a black hole then time slows down for that object.

How black holes formed?

=> Mostly  black holes formed because of compression of mass and density of stars.

So,  first we know how stars formed and then black holes.

= stars are formed by the cloud of  gas and dust present in our universe which we simply called as Nebula.

= They are mostly composed of hydrogen and helium with some amount of another elements.

= when the density of nebula decreases then they contract because of their  gravitational force and then its temperature rises at very high level and in that temperature hydrogen atom makes helium by fusion reaction and because of the speed of hydrogen atom and also heat the nebula takes a spherical shape which we call star.

Now black hole formation -

= The gravitational force of stats are balanced by their heat.

And hydrogen acts as a fuel for it.

= and when its hydrogen  finishes then with passage of  time that star cools down and then its mass and density  becomes 4 times greater then its original mass and density.

And then that star can't control its gravitational force and then a blast occurs which we call supernova.

And after this blast if any of the piece of that star which have more mass remains then it becomes a star which have mass and density of a critical level and we call this as  Neutron star.

In this type of Neutron star because of its gravitational force then it starts contracting  and after contracting it at a critical level then it becomes a body which have infinite density and mass and because of this infinte density and mass the space time bents inward there and then it doesn't be there and we call this as a black hole.

Its whole mass is focused at center which we call it

✳ central singularity point 

And the boundary of black hole is called

✳ event horizon

And nothing can escape from here even light can't.

And here concept of time doesn't work.

=>  According to theory of relativity if the object is near the black hole then the time slows down for it.

Types of black holes

1. Stellar mass black hole

~> It is the type of black hole formed because of contraction of a star which have mass about 3 times greater than the sun.

2. Super massive black holes

~> It is formed in center of any galaxy and have infinite mass and gravitational force and it has mass about 100000000 times that of sun.

3. Permordial or small black holes

~> They are formed because of the more heat at the center of a star and the mass of that star is less than that of our sun.

Physicist  think that  they formed with the beginning of universe

✳ the nearest black from earth is 

cygnus x1
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