A 1000 kg car is moving on flat road at a constant speed of 25 m/s. What is the magnitude of average not force, that is required to slowing the car to 12.5 m/s within 22 seconds?

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.