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Gravitational Potential Energy

An ice cube o...

Question

An ice cube of size $a = 20 c m$ is floating in a lake filled with water. The relative density of ice is $0.9$ . The change in gravitational potential energy when ice melts completely will be

A

Zero

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B

increase by

0.72 J

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C

decrease by

0.72 J

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D

increase by

7.2 J

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Solution

The correct option is C decrease by $0.72 J$

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