Mass of ruler moments

  • #1
Homework Statement:
Trying to answer the question shown in the picture below. I have to deduce the mass of the ruler.
Relevant Equations:
Assuming it’s a moments problem
The answer is 127.04g. I’m getting close but can’t get the answer.

Using 9.81 for gravity, the force where the balance is is 2.10(58146)N

As it is balanced

2.10N x 0.29m = W x 0.50m where 0.50 is the centre of mass

That gives W = 1.22N

= 124.5g?

79E3FA4E-774C-4D13-AAF5-FF5342CAF14D.jpeg
 

Answers and Replies

  • #2
mjc123
Science Advisor
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Is 0.50 m correct for the centre of mass?
 
  • #3
jack action
Science Advisor
Insights Author
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Did you notice the metre ruler was pivoted at the 1.0 cm mark?
 
  • #4
49cm, thank you!
 

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