A box that weighs 300 N is pulled by a rope across a level surface with a constant velocity. The rope makes an angle of 30.0 degrees above the horizontal, and the tension in the rope is 100 N. What is the magnitude of the normal force from 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 vertical component of the tension reduces the normal force. The normal force is the weight minus the vertical component of the tension: 300 N - 100 N * sin(30°) = 250 N.

A Box That Weighs 300 N Is Pulled by a Rope