Gravel falls with practically zero velocity onto a conveyor belt at the constant rate q = dm/dt….

Gravel falls with practically zero velocity onto a conveyor belt at the constant rate q = dm/dt. (a) Determine the magnitude of the force P required to maintain a constant belt speed v. (b) Show that the kinetic energy acquired by the gravel in a given time interval is equal to half the work done in that interval by the force P. Explain what happens to the other half of the work done by P

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