What is the Mass of the Ruler on a Sharp Edge?

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SUMMARY

The discussion focuses on calculating the mass of a ruler using principles of torque and balance. A 100g stone, exerting a force of 0.981N, is placed 3.0cm from one end of a 52.0cm ruler, which is balanced on a sharp edge located 15.0cm from the same end. By applying the concept of moments, the mass of the ruler can be determined through the equation of torques around the pivot point.

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Miri
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Turning effects of forces 3

Homework Statement


A ruler of an unknown mass is 52.0cm long. To find out its mass, you put a stone of 100g on the ruler 3.0cm from its end and balance the ruler on a sharp edge. The ruler is balanced when the supporting edge is 15.0cm from its end. Calculate the mass of the ruler.


Homework Equations


I know that the force of the stone is 0.981N. But what do I have to do to find out the force pointing downward of the ruler, so that I can find the mass...?
 
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Miri said:

Homework Statement


A ruler of an unknown mass is 52.0cm long. To find out its mass, you put a stone of 100g on the ruler 3.0cm from its end and balance the ruler on a sharp edge. The ruler is balanced when the supporting edge is 15.0cm from its end. Calculate the mass of the ruler.


Homework Equations


I know that the force of the stone is 0.981N. But what do I have to do to find out the force pointing downward of the ruler, so that I can find the mass...?
This question is very similar to your other thread, turning forces 4 and can be tackled in a very similar manner.
 

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