10.12 A 10 kW drilling machine is used to drill a bore in a small aluminium block of mass 8.0 kg.

10.12 A 10 kW drilling machine is used to drill a bore in a small aluminium block of mass 8.0 kg. How much is the rise in temperature of the block in 2.5 minutes, assuming 50% of power is used up in heating the machine itself or lost to the surroundings? Specific heat of aluminium =0.91Jg−1 ∘C−10.91𝐽𝑔−1 ∘𝐶−1.
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