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pnwokolo
Joined: 11 Mar 2010 Posts: 11 Location: Toledo,OH

Posted: Mon Mar 29, 2010 3:37 am Post subject: Calculusbased physicsPlease help solve this problem! 


Site Admin,
Please See if this diagram can help because I couldn't copy and paste the actual diagram but it looks like this
Question:
A rigid rod of mass m3 is povited at point A, and masses m1 and m2 are hanging from it, as
shown.
Point A

 L1 ∆ m3 L2 
 
O m1 
⃝ m2
(a) What is the normal force acting on the pivot point?
(b) What is the ratio of L1 to L2, where these are the distances from the pivot point to m1
and m2, respectively? Assume m2 = 2m1 and m3 = 3m1 

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hepcj Site Admin
Joined: 23 Jun 2007 Posts: 125

Posted: Tue Mar 30, 2010 8:53 am Post subject: 


Nice try with the diagram but it still does not help. What I can say in general, is that the normal force is the force that is perpendicular to the surface of contact so in this question, it will be the horizontal component of the force pushing the rod against the wall. The mass of the rod acts at a point located at the half the length of the rod downwards.
Perhaps this is enough for you to answer the question.
Also, you do not need to open a new discussion to continue this thread, just add a reply to the existing thread. 

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pnwokolo
Joined: 11 Mar 2010 Posts: 11 Location: Toledo,OH

Posted: Tue Mar 30, 2010 4:22 pm Post subject: calculus based physics 


Site Admin,
Thanks for your help and advice.
Patrick. 

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