ISRO Scientist or Engineer Mechanical 2016 Question 13

Question 13

A 10 kW drilling machineis used to drill a bore in a small aluminium block of mass 8 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 block? (specific-heat of aluminum : 0.91 J/($$g^\circ C$$))

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