Answered: 1. A painter of weight 1000N stands…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter8: Rotational Equilibrium And Rotational Dynamics

Section: Chapter Questions

Problem 8WUE: A horizontal plank 4.00 m long and having mass 20.0 kg rests on two pivots, one at the left end and...

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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. The diagram below shows the two upward forces P and Q acting on the plank due to the trestles.

(a) Complete the diagram above to show any other forces which are acting on the plank. Name each of these forces.

(b) What is the magnitude of the total downward force exerted on the trestles?

(d) By taking moments about the left trestle, calculate the upward force exerted on the plank by the other trestle.

1. 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. The diagram below shows the two
upward forces P and Q acting on the plank due to the trestles.
0.5m
:0.5m
|
(a) Complete the diagram above to show any other forces which are acting on the
plank. Name each of these forces.
(b) What is the magnitude of the total downward force exerted on the trestles?
(c) What is the magnitude of the total upward force exerted by the trestles on the
plank?

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