Question

10: A 6 m beam of weight 1,200 N has a fulcrum supporting it 2 m...

10: A 6 m beam of weight 1,200 N has a fulcrum supporting it 2 m from the left end. There is a cable attached to the

left end of the beam and anchored to the ground. Nutty Physics teacher has a weight of 400 N and –

stands 1 m from the right end of the beam.

A: What is the tension in the cable?

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Answer #1

Given the weight of the beam is W(B) = 1200N and the length of the beam is L = 6m. The fulcrum is at 2m from the left end. The cable is attached to the ground at the left end and the teacher is standing at a distance 1 m from the right end. The weight of the teacher is W(T) = 400N. The forces acting on the system is shown below.

Taking torque about the fulcrum,

So the tension in the cable is 1200N.

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