Imagine the door to a theatre is opened and you are standing outside. How is it possible that you can hear the sound of the movie or play even if you cannot see the screen or stage ?A) reflection only happens with sound waves not waves of light so the sound waves bounce out to your ears.

B) the sound waves refract as they move from one medium to another

C) the darkness in the theatre absorbed light but not sound so you can hear

D) the sound waves diffract much more than the light waves so try bend and spread as they move through the doorway.

Answers

Answer 1

Answer: Imagine the door to a theatre is opened and you are standing outside. You can hear the sound of the movie or play even if you cannot see the screen or stage because the sound waves diffract much more than the light waves so try bend and spread as they move through the doorway. The answer is letter D

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Light can travel through a medium, but it does not require a medium.
a. True
b. False

Answers

That's true. Light can travel through glass, water or jello,
but it also gets here very effectively through empty space,
from the sun and stars.

What is the difference between magnetic field and magnetic flux

Answers

Explanation:

The region around a moving charge in which it experience a force is called magnetic field. The force is called magnetic force. The force experienced due to moving charge is given by :

$F=q(v* B)$

q is the charged particle

v is the speed of particle

B is the magnetic field

The number of magnetic field lines passing through any surface is called magnetic flux. The formula used to find the magnetic flux is given by :

$\phi=B.A$

$\phi=BA\ cos\theta$

Hence, this is the required solution.

A 4,000-kg car traveling at 20m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

Answers

Rate of change of momentum = impact force
(m*v-m*u)/t = F
4000*20/t = 80000 (note: v is zero as it stopped)
soo, t = 1 sec

Which of the following is the best example of a proper hypothesis? Orange popsicles taste sweeter than grape popsicles. If two objects are dropped at the same height, the heavier object will hit the ground first. Children who wear backpacks do better academically. I think there is no effect on hearing if you listen to loud music only three hours a day.

Answers

Answer:

If two objects are dropped at the same height, the heavier object will hit the ground first.

Explanation:

A proper hypothesis has the form:

"If ... , then ... ".

Now, why the other sentence aren't hypothesis?

Orange popsicles taste sweeter than grape popsicles.

This sentence its an OPINION. It may be true that, for the speaker/writer, orange popsicles taste sweeter, but this is an subjective opinion, and difficult to test.

Children who wear backpacks do better academically.

This sentence its an STATEMENT. If we wish to make an proper hypothesis, it should take the form:

If children wear backpacks, then they do better academically.

I think there is no effect on hearing if you listen to loud music only three hours a day.

This sentence its another OPINION. This opinion COULD be tested, but the proper way of write it as an hypothesis would be:

If someone listed to loud music only three hours a day, then there shoul be no effect on his/her hearing.

Answer:

Answer is:If two objects are dropped at the same height, the heavier object will hit the ground first.

Explanation:

A neutral metal comb is held near an object with a negative charge.What happens to the comb?

A. The comb is charged by contact.

B. The comb is charged by friction.

C. The comb is charged by static discharge.

D. The comb is charged by induction.

Answers

D. The comb is charged by induction.

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10 m/s, northwest
14 m/s, northwest
48 m/s, northwest