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A 15kW drilling machine is used to drill...

A 15kW drilling machine is used to drill a bore in a small aluminium block of mass 10 kg. Assuming 50% power is used up in heating the machine itself or lost to the surroundings then, the rise in temperature of the block in 2 minutes is (Specific heat capacity of aluminium `=0.91 J g^-1^@C^-1`)

A

`108^@C`

B

`88.9^@C`

C

`108.8^@C`

D

`98.9^@C`

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