A diving board length L = 5.00m that weighs 250N is supported by two pillars. On

Question

A diving board length L = 5.00m that weighs 250N is supported by two pillars. One pillar is at the left end of the diving board, as shown below; the other is distance d = 1.65m away(Figure 1)

Part A: Find the magnitude of the force exerted by the left pillar when a 80.0kg diver stands at the far end of the board.

Part B: Find the magnitude of the force exerted by the right pillar when a 80.0kg diver stands at the far end of the board.

http://session.masteringphysics.com/problemAsset/1125507/7/Walker4e.ch11.Pr031.jpg

Explanation / Answer

a) balancing moment about right pillar,

FL x 1.65 - 250 x (2.5 - 1.65) - 80g x (5- 1.65) = 0

FL = 1720.55 downwards

b) balancing moment about left pillar,

1.65 xFr - 250 x 1.65 - 80g x5 = 0

Fr = 2625.76 N upwards

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