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OlgaM077 [116]
2 years ago
10

Water falls off a cliff of height 20m at a rate of 50kg per second

Physics
1 answer:
docker41 [41]2 years ago
5 0

Answer:

M = 50 kg / sec * 60 sec = 3000 kg       water that falls

PE = M g h     initial potential energy of water

PE = 3000 kg * 9.8 m/s^2 * 20 m = 588,000 joules of energy lost

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3 years ago
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3, A 4kg block is pushed 2m at an acceleration of 0.2m/s square up a vertical wall by a constant force F applied at an angle of
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The work done by the applied force on the block against the frictional force is 15.75 J.

<h3>Work done by the applied force</h3>

The work done by the applied force is calculated as follows;

W = Fd

F - Ff = ma

where;

  • F is applied force
  • Ff is frictional force

Fcos(37) - μmgsin(37) = ma

Fcos(37) - (0.3)(4)(9.8)sin(37) = 4(0.2)

0.799F - 7.077 = 0.8

F = 9.86 N

W = Fdcosθ

W = 9.86 x 2 x cos(37)

W = 15.75 J

Thus, the work done by the applied force on the block against the frictional force is 15.75 J.

Learn more about work done here: brainly.com/question/25573309

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5 0
2 years ago
Different units used to describe average velocity can be changed from one to another by the use of
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3 years ago
If a sound wave is produced with a wavelength of 1.04m what is the waves frequency
dmitriy555 [2]
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3 years ago
If a car goes down Lake at 30 miles per hour how far will it go in 0.25 hours?
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Answer:

7.5 miles

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0.25 hours=15minutes.

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