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Ivenika [448]
3 years ago
11

A person swims to the other end of a 20m long pool and back. What is their displacement?

Physics
1 answer:
mafiozo [28]3 years ago
3 0

Answer:

Zero

Explanation:

It is given that,

A person swims to the other end of a 20m long pool and back.

We need to find his displacement.

Displacement = shortest path covered

He reaches at the same position as from where he has started. It means the shortest path covered is equal to 0 i.e. his displacement is zero.

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It would not. Imagine four forces equal in magnitude but opposite in direction (e.g. north, east, south, and west). If these forces were to double in magnitude they would still have the same magnitude, meaning the net force is still equal to zero.
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2 years ago
Sound and light are both found as _____, with a variety of ____. The sun, a source of light waves specifically, releases a type
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Answer:

Waves; wavelength; electromagnetic energy; ultraviolet light.

Explanation:

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Sound travels faster through solids than it does through either liquids or gases.

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2 years ago
The loaded cab of an elevator has a mass of 3.0 x 10 3 kg and moves 200 m up the shaft in 20 s at constant speed. At what averag
Alexeev081 [22]

The average rate at which the cable does work is 294,000 J/s.

The given parameters:

  • <em>mass, m = 3000 kg</em>
  • <em>height, h = 200 m</em>
  • <em>time of motion, t = 20 s</em>

The average rate at which the cable does work is calculated as follows;

P = \frac{E}{t} \\\\P = \frac{mgh}{t} \\\\P = \frac{3000 \times 9.8 \times 200}{20} \\\\P = 294,000 \ J/s

Thus, the average rate at which the cable does work is 294,000 J/s.

Learn more about energy and power here: brainly.com/question/13387946

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3 years ago
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Answer

The answer for the first one I think is false.

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3 years ago
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A newspaper and a metal lunchbox are sitting in sun. Why does metal lunchbox feel hotter to touch than a newspaper?
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Answer:

A

Explanation:

the metal lunchbox has a higher conductivity

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