A m 23 kg block of a solid cools down by transferring heat

A m = 23 kg block of a solid cools down by transferring heat at a rate of Q = 1.60 kW to the surroundings. Determine the rate of change of the stored energy in the block. Express your answer to three significant figures and include appropriate units. Determine the rate of change of the internal energy of the block. Express your answer to three significant figures and include appropriate units.

Solution

Apply conservation of energy

E_in - E_out = E_stored

0 - 1.60 = E_stored

a) dE/dt = -1.60 kW

b) internal Energy = stored energy

dU/dt = -1.60 kW