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posted by  KAT007 on 5/9/2008 12:34:33 AM  |  status: Live  |  Earned Karma: 25

Rotational Equilibrium- Heeelp!!!

Course Textbook Chapter Problem Needs by
Algebra Based Physics Holt Physics (1st) by Serway, Faughn 8 N/A N/A
Question Details:
A 42 kg child and a 35 kg child sit on either end of a 4.2 m long seesaw.
1) Where along the seesaw should the pivot be placed to ensure rotational equilibrium?
2)  Suppose a 22 kg child sits 0.4 m from the 42 kg child.  Where must a 37 kg child sit to maintain rotational equilibrium?
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posted by Dr. House on 5/9/2008 2:49:44 AM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:
The necessary condition for rotational equilibrium is that the net torque about any axis must be zero.
 
the pivot is approx. 1.91 to the right of the person that has a mass of 42 kg or if you prefer
2.29m  to the left of the person that has a mass of 35 kg.
 
 
For the other question you need to do a similar diagram with the new information and make the
operation 
 
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