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.
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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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