Question
A painter of weight 1000N stands 1.0m from the left-hand end of a uniform plank which is 5.0m long and weighs 800N. The plank is supported by two trestles each 0.5m from the opposite ends. Thre are two upward forces P and Q acting on the plank due to the trestles.
By taking moments about the left trestle, calculate the upward force exerted on the plank by the other trestle.
By taking moments about the left trestle, calculate the upward force exerted on the plank by the other trestle.
Answers
P = 800N + 1000N(1.0m/5.0m) = 1000N
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