A box that weighs 300 N is pulled across a level surface with a constant velocity.The rope makes an angle of 30.0 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) 86 N
B) 300 N
C) 50 N
D) 250 N
E) 0 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. Therefore, the normal force is 300 N - 50 N = 250 N.

A Box That Weighs 300 N Is Pulled Across a Level