a drilling machine of power P watts is used ti drill a hole in copper block of mass M kg.if the specific heat of copper is sJKg-10c-1 and 40percentage of the power is lost due to heating of the machine the rise in the temperature of the block in T second will be in c
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Power of machine = P;
Energy used by machine in time 'T' = PT
Out of which 40% is wasted
i.e. Energy used on the block = 0.6PT=Q
This energy is used to heat the block
The rise in temperature is given by:
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