
Concept explainers
a.
Work done to pull the object.
a.

Answer to Problem 61A
Explanation of Solution
Given:
Displacement is 7 meters.
Formula Used:
The area under force vs displacement graph gives the work done.
Area of triangle:
Area of rectangle:
Calculation:
From the graph:
From 0 to 2 m:
It is a triangle of height 20 m and base 2 m. So,
From 2 to 3 m:
It is a triangle of base 1 m and height 30 m and a rectangle of length 20 m and width 1 m. So,
From 3 to 7 m:
It is a rectangle of length 50 m and width 4 m. So,
Hence total work is,
Conclusion:
The total work done to pull the object is 255 J.
b.
Power developed.
b.

Answer to Problem 61A
Explanation of Solution
Given:
Displacement is 7 meters.
Time given is
Formula used:
Power developed is given as,
Where,
Calculation:
As work done for 7 meters is
So, power developed for
Conclusion:
Power developed in 2 s is 127.5 W.
Chapter 10 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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