Concept explainers
(a)
To Calculate: Final kinetic energy of the automobile.
(a)
Answer to Problem 106A
Kinetic energy is
Explanation of Solution
Given:
Mass of the automobile,
Final speed of the automobile,
Formula used:
where,
KE: Kinetic energy
m: mass
v: speed
Calculation:
Substitute the values in above formula and solve:
Conclusion:
Hence, the final kinetic energy of the automobile is
(b)
To Explain: Minimum amount of work done and the reason for no possibility to calculate the total amount of work done.
(b)
Answer to Problem 106A
Minimum amount of work done is
Explanation of Solution
Introduction:
As work done is equal to the change in the kinetic energy, the minimum amount of work done shall equal to that of kinetic energy i.e.
The engine had to do more work than that was consumed in work done against friction. Thus, it is not possible to calculate the total work done.
Conclusion:
Minimum amount of work done is
(c)
To Calculate: The average acceleration of the automobile.
(c)
Answer to Problem 106A
Explanation of Solution
Given:
Change in speed of automobile,
Elapsed time,
Formula used:
where,
Change in velocity
Elapsed time
Calculation:
Substitute the values in above formula and solve:
Conclusion:
Hence, the average acceleration of the automobile is
Chapter 14 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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