a) Suppose a rod (length 97.6 m, mass24.8 kg) balances at a point 41.28 m from o

Question

a) Suppose a rod (length 97.6 m, mass24.8 kg) balances at a point 41.28 m from one end. If you place a fulcrum in thecenter of the rod, what mass would you have to place on the otherend of the rod so it balances?

b) The rod in question a is now lies horizontally, supported oneach end by a piece of wood (point A is the end farthest from thecenter of gravity, and point B is the end nearest to the center ofgravity). If a 75.9 kg mass is placed onthe rod 26.84 m from point A, find theforce exerted by the pillars on the rod.
4 N at point A and5 N at point B

Explanation / Answer

a) The we have to place at the other end of the rod to maintainbalance is                      m = (24.8kg)(41.28 m) / (97.6m - 41.28m)                          = 18.2kg

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