Abearing uses sae 30 oil with a viscosity of 0.1 n·s/m2. the bearing is 30 mm in diameter, and the gap between the shaft and the casing is 2.0 mm. the bearing has a length of 3 cm. the shaft turns at ω = 350 rad/s. assuming that the flow between the shaft and the casing is a couette flow, find the torque required to turn the bearing.

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?