Answer: A 20.0-kg rock is sliding on a rough, horizontal

Chapter 6, Problem 52E

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QUESTION:

 Problem 52E

A 20.0-kg rock is sliding on a rough, horizontal surface at 8.00 m/s and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200. What average power is produced by friction as the rock stops?

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QUESTION:

 Problem 52E

A 20.0-kg rock is sliding on a rough, horizontal surface at 8.00 m/s and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200. What average power is produced by friction as the rock stops?

ANSWER:

Solution 52E

Step 1:

Consider the data given

Mass of rock

Velocity of the down the inclined plane

Kinetic friction

Let us find the kinetic energy of the rock

This is obtained by using

        

Substituting the values we get

        

        

Thus we find kinetic energy as 640 J

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