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3 years ago

Which statements accurately describe the Doppler effect?

Physics

2 answers:

Mnenie [13.5K]3 years ago

8 0

Answer:

A. It is used to learn about the behavior of the universe.

B. It was used by Hubble to measure velocities of galaxies.

C. It indicates galaxy motion through light wavelengths.

chubhunter [2.5K]3 years ago

5 0

The doppler effect is the increase or decrease in the frequency of sound, light, or other waves as the source and observer move toward or away from each other.

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If the strength of a magnetic field at B is three units the strength of the magnetic field at A is ____?

Tema [17]

If the strength of a magnetic field at B is three units the strength of the magnetic field at A, means that point B has three times more turns as compared to point A.

<h3>How strength of the magnetic field should be increased?</h3>

We can increase the strength of the magnetic field by increasing the number of turns which increases the strength of the current flow.

So we can conclude that point B has three times more turns as compared to point A.

Learn more about magnetic field here: brainly.com/question/14411049

#SPJ1

8 0

2 years ago

For the electric power transmission system shown in the figure above, what is the ratio ns/np for the step-up transformer? assum

Ann [662]

I am attaching the missing figure

If we assume 100% efficiency, this means that the input power of the transformer must be equal to the output power

We divide output/input

240,000/12,000 = 20

This means that the transformer has a turns ratio of 1:20

<span>ns/np = 20/1 = 20

The voltage is amplified 20 times by the transformer, but this also means that the current decreases by a factor of 20, so the total power remains the same.</span>

7 0

3 years ago

While sitting in a boat, a fisherman observes that 2 complete waves pass by his position every 4 seconds. What is the period of

Bad White [126]

Answer:

Explanation:

Because 2 waves 4 secs means 1 in 2s

7 0

3 years ago

Water from a river or reservoir enters a hydroelectric power plant through a.....????

JulijaS [17]

Through a dam... hope this helps:)

5 0

3 years ago

Read 2 more answers

What force is necessary to pull a 10 kg sled across a horizontal surface at a constant velocity if the coefficient of kinetic fr

Igoryamba

Answer:

Any force greater than 24.5 N

Explanation:

To find the frictional force is the 1st step. this can be found by multiplying the coefficient of friction and the normal force. normal force can be found by multiplying gravity (we will say 9.8 m/s/s) and the mass which is 10. You then multiply the result by the coefficient of friction which is 0.25 and it leads us to an answer to 24.5 N. This means that if you pull with exactly 24.5 N, the sled wouldnt move. So you need a force greater than 24.5 N and we have our answer.

I hope I helped correct me if im wrong

3 0

3 years ago