A drilling machine of power P watts is used to drill a hole in copper block of mass M kg. If the specific heat of copper is s J/kg-C and 40% of the power is lost due to heating of the machine, the rise in the temperature of the block in T seconds will be (in °C)?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
useful power = 0.6 P
∴ energy consumed in T sec. = 0.6 PT
Now, Ms Δ T = 0.6 PT
∴ Δ T = 
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