A student decides to move a box of books into her dormitory room by pulling on a

Question

A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 140 N at an angle of 26.0 degree above the horizontal. The box has a mass of 24.0 kg, and the coefficient of kinetic friction between box and floor is 0.300. Find the acceleration of the box. m/s2 The student now starts moving the box up a 10.0 degree incline, keeping her 140 N force directed at 26.0 degree above the line of the incline. If the coefficient of friction is unchanged, what is the new acceleration of the box? m/s2, up the incline

Explanation / Answer

a)

The system is in equilibrium in the y-direction but not in the x-direction.

SFx= ma

140 N cos 26.00

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