A person of mass m is standing at the end of a beam of uniform density and with

Question

A person of mass m is standing at the end of a beam of uniform density and with mass M. The beam is supported by two ropes as shown. If we know the tension in the right rope, the mass of the person (m), and the length of the beam, and are asked to find the tension in the left rope, where should we put our axis of rotation?

A. At the location where the left rope attaches to the beam

B. At the location where the right rope attaches to the beam

C. At the midpoint of the beam

D. At the left edge of the beam

E. At right edge of the beam (where the person is standing)

Explanation / Answer

At the mid point of the beam because moment due to the weight of beam about the mid point will be zero otherwise we need to know the weight of the beam also.

So option C is correct.

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