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A hole is drilled into a block of lead o...

A hole is drilled into a block of lead of mass `10kg` by a driller. The driller is driven by an electric motor of 30 r.p.m. and the couple exerted by the motor on the driller is `10Nm`. Calculate the rise in temperature of the lead in 10 minutes. `J=4.2` joules `cal^(-1)`. Relative specific heat capacity of lead 0.03 and sp. heat capacity of water `1000 cal kg^(-1)K^(-1)`.

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The correct Answer is:
`14.96^(@)C`
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