
Concept explainers
(a)
The force exerted on the boulder to move it up the mountain with constant velocity.
(a)

Answer to Problem 102A
The force exerted on the boulder to move it up the mountain with constant velocity is
Explanation of Solution
Given:
The mass
The coefficient of kinetic friction
The angle made by the surface of the mountain with the horizontal is
Formula used:
The expression for the kinetic friction acting on a moving object is as follows:
Here,
Calculation:
For the given specifications, the free body diagram of the situation is shown below.
Find the normal force
The kinetic frictional force acting on the person is,
The person has to apply force equal to the kinetic friction to move the boulder up the hill.
Conclusion:
Therefore, the force exerted by the person S on the boulder to move it up the mountain with constant velocity is
(b)
The height of the mountain.
(b)

Answer to Problem 102A
The height of the mountain is
Explanation of Solution
Given:
The mass
The coefficient of kinetic friction w
The angle made by the surface of the mountain with the horizontal is
The initial velocity of the person S is
The time taken by the person S to reach the top of the hill is
Formula used:
The distance travelled according to second equation of motion is,
Here,
Calculation:
Consider the acceleration due to gravity of Earth is
Consider the height of the hill is denoted by
The height of the hill as follows:
Conclusion:
Therefore, the height of the hill is
Chapter 5 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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