Question

A railroad car moves under a grain elevator at a constant speed of 3.20 m/s. Grain drops into the car at the rate of 310 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible

Answer 1

The magnitude of the force needed to keep the car moving at constant speed if friction is negligible is 376 N.

The formula for the force of a moving object is F=ma, where m is the mass and a is the acceleration. If the train has a constant speed of 3.20 m/s and a mass of 3,760 kg, then the force required to keep it moving is 376 N.