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a painter (of mass 81 kg) needs to reach out from a scaffolding to paint the side of a building, so he lays a plank across two bars of the scaffolding, and puts a heavy bucket of mass 22 kg directly over one of the bars (see figure). you can assume the plank is massless, and is long enough to reach to the other building.
a. If the bars are separated by a distance 1.2 m, how far, d, from the bar on the the right can the painter walk before the plank starts to fall?



Answer :

0.325 m far from the bar on the the right can the painter walk before the plank starts to fall.

Calculation :

balancing the moment of forces about right bar

22kg * g* L = 81* g * L

 d = (22/81)*L

 d =  (22/81)*1.2

 d = 0.325 m

The word "force" has a precise meaning. At this level it is appropriate to describe the force as pushing or pulling. A force does not contain or "have within" an object. A force is applied from one object to another. The concept of force is not limited to living things and inanimate things

Learn more about force here : https://brainly.com/question/12785175

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