The device shown is designed to position pieces of luggage on a ramp. It exerts a force pa...

The device shown is designed to position pieces of luggage on a ramp. It exerts a force parallel to the ramp. The suitcase weighs 40 lb. The coefficients of friction between the suitcase and the ramp are μs = 0.20 and μk = 0.18.

(a) Will the suitcase remain stationary on the ramp when the device exerts no force on it?

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(b) What force must the device exert to push the suitcase up the ramp at a constant speed?