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GarryVolchara [31]
3 years ago
9

A 20-kg block slides down a fixed rough curved track The block has a speed of 5 0 m/s after its height above a horizontal surfac

e has
decreased by 1.8 m. Assume the block starts from rest. How much work is done on the block by the force of friction during this descent?​
Physics
1 answer:
Crank3 years ago
8 0

Answer:

U = 102.8 J (100 J to two significant digits)

Explanation:

potential energy converted = 20(9.8)(1.8) = 352.8 J

kinetic energy at base of track = ½(20)5.0² = 250 J

energy (work) of friction 352.8 - 250 = 102.8 J

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Answer:

No, the farmer is not able to move the mule.

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3 years ago
A ball rolls 12m in 2.0s. What is the ball’s average velocity?
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An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude f of the force exerted on the
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The force f of the elevator on the man keeps reducing as the elevator keeps going up while the gravitational force mg keeps increasing moving upwards.

<h3>What is an elevator?</h3>

An elevator is an electrical device that lifts people up and down a tall building or structure.

for the elevator to go up, f > mg.

for the elevator to come down mg > f.

Analysis

since the force on the man is f = ma

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Learn more about forces in an elevator : brainly.com/question/13526583

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