Force Equilibrium of house painter

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AI Thread Summary
The discussion centers on calculating the forces exerted by two cables supporting a platform with a painter on it. The painter's mass is 72 kg, and the platform's mass is 19.7 kg, with the painter positioned 2.2 m from the left end of a 5.4 m platform. Participants emphasize the importance of drawing a free body diagram to visualize forces and distances. They discuss using the equilibrium condition for torques, stating that the sum of clockwise moments must equal the sum of counterclockwise moments. Understanding torque and its calculation is essential for solving the problem effectively.
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Homework Statement



A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. The painter has a mass of 72 kg and the mass of the platform is 19.7 kg. The distance from the left end of the platform to where the painter is standing is d = 2.2 m and the total length of the platform is 5.4 m.

fig-060.gif


(a) How large is the force exerted by the left-hand cable on the platform?
____ N

(b) How large is the force exerted by the right-hand cable?
____ N


Homework Equations


?


The Attempt at a Solution



How do you do this when there is two different points of rotation??
 
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OK well firstly you need to draw a free body diagram with all the forces you are told and their distances.

You are aware of the formula;
<br /> \sum {M_{CW} } = \sum {M_{ACW} } <br />
?
 
what does this mean? the sum of ..masses?
 

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