The rod of negligible mass is subjected to a couple moment of m = (30t2) n⋅m and the engine of the car supplies a traction force of f = (15t) n to the wheels, where t is in seconds. the car starts from rest. the total mass of the car and rider is 185 kg . neglect the size of the car.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?