Concept explainers
a.
Speed ofK.
a.
Answer to Problem 71A
3.429 m/s
Explanation of Solution
Given:
Weight of K,
Initial height,
Final height,
Formula used:
Change in potential energy is given by
Here, m is mass, g is acceleration due to gravity and h is height.
Kinetic energy is given by
Here, m is mass and vis velocity.
According to energy conservation.
Calculation:
Now, substitute the value of m, g,
Conclusion:
Therefore,K is moving with speed of 3.429 m/s.
b
Work done by friction.
b
Answer to Problem 71A
Explanation of Solution
Given:
Weight of K,
Initial height,
Final height,
Speed of K at lowest point is,
Formula used:
According to work energy theorem work done is equal to change in kinetic energy.
Weight:
Here, m is mass and gis acceleration due to gravity.
Calculation:
Now, substitute the value of w and g in equation 1 and solve.
Due to frictional force,K will finally stop.
Therefore,
Now, substituting value of m, v and u in equation 2 and solve.
Here, negative sign indicates that work is done by friction.
Conclusion:
Therefore, work done by friction is 85.714 J.
Chapter 11 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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