Atotal of 10 rectangular aluminum fins (k 5203 w/m·k) are placed on the outside flat surface of anelectronic device. each fin is 100 mm wide, 20 mm highand 4 mm thick. the fins are located parallel to each otherat a center-to-center distance of 8 mm. the temperature atthe outside surface of the electronic device is 60°c. the airis at 20°c, and the heat transfer coefficient is 100 w/m2.k. determine(a) the rate of heat loss from the electronic device to the surrounding air and (b) the fin effectiveness.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10