Two rooms are separated by a wall that is wood panel, r= 0.93 (usual units) on one side, withfiberglass insulation r = 13.0 between the walls and wall board r = 0.46 on the other. one roomis air conditioned at 74 deg. f and the room is not air conditioned at 92 deg. f. film coefficientsare r = 0.68 on both walls. what is the heat transfer rate from the warm room to the cool room? neglect the heat transfer reduction by the wall studs.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?