The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. what gauge pressure is required so the area of contact of each tire with the road is 100 cm 2?

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.