You pull a 12-kg box across the floorwith a strap that is at an angle of 30° abo

Question

You pull a 12-kg box across the floorwith a strap that is at an angle of 30° above the horizontal. Find the normal forceand the tension in the strap, given that the box moves withconstant speed and that the coefficient of kinetic friction betweenthe box and the floor is 0.41. Normal force N? Tension N? You pull a 12-kg box across the floorwith a strap that is at an angle of 30° above the horizontal. Find the normal forceand the tension in the strap, given that the box moves withconstant speed and that the coefficient of kinetic friction betweenthe box and the floor is 0.41. Normal force N? Tension N?

Explanation / Answer

Sum up the forces in both directions, so TCos-f=0 orTCos-N=0 and N-mg+TSin=0 from this we have(TCos)/+TSin=(12)(9.8) orT(Cos/+Sin)=(12)(9.8). Then T=45 N and N=95.05N.

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