A 10 kW drilling machine is used to drill a bore in an aluminium block of mass 25 kg . If the machine is on for 3 minutes and 50% of the heat liberated is taken up by the block, then the raise in temperature of the block is (specific heat of aluminium is 900 J kg − 1 K − 1 )

Question

A 10 kW drilling machine is used to drill a bore in an aluminium block of mass 25 kg . If the machine is on for 3 minutes and 50% of the heat liberated is taken up by the block, then the raise in temperature of the block is (specific heat of aluminium is 900 J kg − 1 K − 1 ), 2 0 ∘ C, 4 0 ∘ C, 8 5 ∘ C, 15 0 ∘ C

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