Concept explainers
Work done by weight lifter.
Answer to Problem 86A
Explanation of Solution
Given:
Mass of barbell,
Height,
Formula used:
Here, U is potential energy, m is mass, g is acceleration due to gravity and h is height.
Calculation:
Work done in lifting the barbell will be equal to potential energy gained by the barbell.
Acceleration due to gravity on earth,
Now, putting the value of m, g and h.
Conclusion:
Therefore, work done in lifting the barbell is
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