A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30 $\degree$ above the horizontal,and the tension in the rope is 100 N.What is the normal force of the floor on the box?
A)300 N
B)86 N
C)50 N
D)250 N

Question

Quizplus · Accepted Answer

The normal force is the weight of the box minus the vertical component of the tension. The vertical component of the tension is 100 N * sin(30°) = 50 N. So, the normal force is 300 N - 50 N = 250 N.

A Girl Is Using a Rope to Pull a Box °\degree°

A Girl Is Using a Rope to Pull a Box $\degree$