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A power drill of 400W makes a hole in a lead cube of specific heat capacity 0.13Jg^-1°C^-1 in 80s.

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A power drill of 400W makes a hole in a lead cube of specific heat capacity 0.13Jg-1°C-1 in 80s. If the temperature of lead rises from 27°C to 327°C, calculate the mass of the lead cube.

 

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C = 0.12g-1°C-1

heat produced in 80s = P x t = (400 x 80)J

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