A 2.5-cm thick sheet of plastic (k = 2.42 W/m · K) is to be bonded to a 5-cm thick aluminum plate. The glue that will accomplish the bonding is to be held at a temperature of 325 K to achieve the best adherence, and the heat to accomplish this bonding is to be provided by a radiant source. The convective heat-transfer coefficient on the outside surfaces of both the plastic and aluminum is 12 W/m² · K, and the surrounding air is at 295 K. What is the required heat flux if it is applied to the surface of 

(a) The plastic? 

(b) The aluminum?