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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

Zero

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increase by

0.72 J

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decrease by

0.72 J

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increase by

7.2 J

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Solution

The correct option is C decrease by $0.72 J$

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Similar questions

a = 10 c m

(b a s e = 50 c m \times 50 c m)

900 k g m^{- 3}

g = 10 m s^{- 2}]

a = 10 c m

A = 50 c m \times 50 c m

900 k g / m^{3}

= 0.9 g / {c m}^{3}

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