Asked by Anonymous

While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.27. The pushing force is directed downward at an angle θ below the horizontal. When θ is greater than a certain value, it is not possible to move the box, no matter how large the pushing force is. Find that value of θ.

Answers

Answered by Kosy
Since the body moves with constant velocity,Pushing force equals frictional force pushing force in x-direction=fcostheta=0.27mg costheta=2.7m/f when pushing force can't do work is when it equals sum of weight of body and frictional forcef=mg+0.27mg costheta=2.7/12.7
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