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Question

Two stones each of mass 5kg fall on a wheel from a height of 10m. The wheel stirs 2kg water. The rise in temperature of water would be


A

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B

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C

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D

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Solution

The correct option is D


For the given condition potential energy of the two masses will convert into heat and temperature of water will increase W=JQ2m×g×h=J(mw SΔt)2×5×10×10=4.2(2×103×Δt)

Δt=10008.4×103=0.119=0.12C


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