Question

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​

Answer 1

Answer:

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: