Acurrent of 9 a flows through an electric device with a resistance of 43 ω. what must be the applied voltage in this particular circuit?
a. 4.8 v
b. 387 a
c. 387 v
d. 4.8 a

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.