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Lesechka [4]
3 years ago
9

A train moves at a constant velocity of 50 km/h. How far will it move in 0.5 h?

Physics
2 answers:
solniwko [45]3 years ago
6 0

Answer:

C.25km

Explanation:

half of 50 is 25.

Igoryamba3 years ago
4 0

Answer:

C. 25 km

Explanation:

The train moves 50 kilometers in 1 hour.

In 0.5 hours, the train will travel 50(0.5) = 25 kilometers.

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Sound waves produced by a source pass a point five times every second. Which of the following choices correctly describes the pe
Ugo [173]

The period is 1/5 second, and the frequency is 5 Hz.

Explanation:

Let's start by reviewing some definitions about waves:

- The period of a wave is the time taken for the wave to make one complete cycle. It is indicated with T and it is measured in seconds (s)

- The frequency of a wave is the number of complete cycles made by the wave in one second. It is indicated with f and it is measured in Hertz (Hz). It is equal to the reciprocal of the period:

f=\frac{1}{T}

where f is the frequency and T is the period.

In this problem, we have a wave that passes a given point five time per second. This means that the number of oscillations per second is five, and so its frequency is:

f=\frac{5 cycles}{1 sec}=5 Hz

It follows than the period of the wave is:

T=\frac{1}{f}=\frac{1}{5}s

Therefore, the correct statement is

The period is 1/5 second, and the frequency is 5 Hz.

Learn more about waves, frequency and period:

brainly.com/question/5354733

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3 0
3 years ago
A. If a T-Rex runs 20 meters in 4 seconds, what is it’s average speed?
mariarad [96]

5m/s

100m

Explanation:

Average speed is sum of distance distance traveled in a given time by a body.

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For the spaceship;

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time = 2s

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