Force exerted by 2 supports on the plank

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SUMMARY

The discussion centers on calculating the forces exerted by two supports on a plank with a crate of mass 7.5 kg placed on it. The user initially applied the torque equation, resulting in incorrect force values of approximately 66 N and over 400 N for the two supports. The correct forces should be 130 N and 60 N, indicating that additional factors, such as the mass of the plank, must be considered to accurately solve the problem.

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Homework Statement


Suppose a crate of mass 7.5 kg is placed on the plank in the figure below, at a distance of 3.9m from the left end. Find the forces exerted by the 2 supports on the plank.


Homework Equations



Torque=radius*force


The Attempt at a Solution


I've used the tourque equation to get an answer around 66 for the force of the first support (the farthest to the left). I'm getting an answer in the 400's for the second support. I know the answers are supposed to be 130 N and 60 N. So, do I need to be using a different equation?
 

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A 7.5kg mass only represents a weight of about 73.5N. So something's missing in your problem statement, perhaps the mass of the plank?
 

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