the still I-beam has a weight of 6.9kN and is being lifted at a constant velocity.what is tension in each cabl

Question

cable attached to its ends?

Answer 1

Constant velocity implies no acceleration which means no net force acting on the object by Newton's second Law. This means that the sum of all the forces equals zero. Draw a force diagram of what is going on. You will clearly see that there are three forces acting on the beam. The obvious downward force of gravity (also called weight) and the upward force from each of the two cables. Since the total downward force equals 6900 N, the sum of the two upward forces must also equal 6900 N. If we assume that the cables equally distribute this force, it becomes very clear that each cable has a tension of 3450 N.