Suppose that you slowly lower a 10kg pail of water into a well from ground level to a distance of 1.5 meters below the ground. How much does the potential energy of the pail change?
(A) increases 100J.
(B) increases 150J.
(C) decreases 100J.
(D) decreases 150J.
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What this question is about
(A) increases 100J. --- No. Gravitational
P.E. decreases when an object is lowered.
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(B) increases by 150J. --- No. Gravitational
P.E. decreases when an object is lowered.
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(C) decreases by 100J. --- No. It does
decrease but multiply by the distance.
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(D) decreases by 150J. --- Yes.
By mgh = (10kg)(10 m/s
)(1.5m) = 150J
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