During a storm, the power went out at Bailey’s house. She had no electricity. What could she use as an alternate form of electrical energy?
A) candles
B) a fire in the fireplace
C) a battery-operated lamp
D) a light in the refrigerator

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.