Homework Help: physics

Posted by CJ12 on Tuesday, November 9, 2010 at 3:20pm.

A student pulls on a rope attached to a box of books and moves the box down the hall. The student pulls with a force of 182N at an angle of 25° above the horizontal. The box has a mass of 35kg and &mu k between the box and the floor is 0.27. What is the acceleration of the box.

physics - Henry, Wednesday, November 10, 2010 at 10:22pm
X = hor. = 182*cos25 = 164.9 N.

C.F. = 0.27 = 27% of force used to overcome friction. 73 % used to move
box:
F(net) = 0.73 * 164.9 = 120.4 N.

a = F(net) / m = 120.4 / 35 = 3.4 m/s^2

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