PHYSICS HIGH SCHOOL

Select all that apply.There is no sound in the vacuum of space. Why?
Sound must travel through something that vibrates.
There is no energy in space.
There is no air to vibrate the human eardrum.
Space is too full of light energy.

Answers

Answer 1

Answer:

Answer:

Sound must travel through something that vibrates.

There is no air to vibrate the human eardrum.

Explanation:

Waves can be divided into two types:

- Electromagnetic waves: these are waves produced by the oscillations of electric and magnetic field. This type of wave does not need a medium to propagate, so they can also travel through a vacuum

- Mechanical waves: these are waves produced by the vibrations of the particles in a medium - therefore, they do need a medium to propagate. Sound waves are part of this type, so they cannot travel through a vacuum.

According to these definitions, we can say that the correct choices are the following:

Sound must travel through something that vibrates. --> because they are mechanical waves

There is no air to vibrate the human eardrum. --> because they are mechanical waves

Answer 2

Answer: 1. Sound must travel through something that vibrates.
and
3. There is no air to vibrate the human eardrum.

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Determine the acceleration of the moon, which completes a nearly circular orbit of 384.4 mm radius in 27.3 days.

Why does the same side of the moon always face the earth?

Answers

Because the moon takes exactly precisely the same time to rotate once on its axis as it takes to revolve once in its orbit around the Earth.

Ideally, rewards should be given immediately and frequently buta. only from an instructor or supervisor.
b. in moderate amounts.
c. without a specific timeline.
d. shouldn’t match your personal tastes.

Answers

The correct answer for the question that is being presented above is this one: "a. only from an instructor or supervisor." Ideally, rewards should be given immediately and frequently but only from an instructor or supervisor to show authority.

Energy of a wave is measured in terms of the wave's ?

Answers

Answer: amplitude

Explanation: amplitude is a important measurement, it tells us how much energy a wave is carrying

Energy refers to the speed.So u use the formula speed=wavelength×frequency

-g A small block is attached to an ideal spring and is moving in SHM on a horizontal frictionless surface. The amplitude of the motion is 0.165 m. The maximum speed of the block is 3.90 m/s. What is the maximum magnitude of the acceleration of the block?

Answers

Answer:

a= 92. 13 m/s²

Explanation:

Given that

Amplitude ,A= 0.165 m

The maximum speed ,V(max) = 3.9 m/s

We know that maximum velocity in the SHM given as

V(max) = ω A

ω=Angular speed

A=Amplitude

$\omega =(3.9)/(0.165)\ rad/s$

ω=23.63 rad/s

The maximum acceleration given as

a = ω² A

a= (23.63)² x 0.165 m/s²

a= 92. 13 m/s²

Therefore the maximum magnitude of the acceleration will be 92. 13 m/s².

The AC voltage source is connected to an inductor and a resistor in series. If the frequency of the source is increased the current in the circuit will _________.