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Torque and Massless beam with Two Objects

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Torque and Massless beam with Two Objects!!

Homework Statement



[URL]http://capa.mcgill.ca/res/mcgill/dcmcgill/oldproblems/mcgilllib/Dik/graphics/torque.jpg[/URL]
A massless beam is supported only at one point, called the pivot point, as shown in the diagram. A block with mass m1 sits at the left end of the beam, a distance L1 from the pivot point. A block with mass m2 sits at the right end of the beam, a distance L2 from the pivot point. L2 > L1. Calculate all torques about the pivot point, remembering that positive is anti-clockwise.
Select Yes, No, Less than, Equal to, or Cannot tell.


(a)If m1 = m2, will the masses have an angular acceleration?

(b)Given particular values of L1 and L2, does the angular acceleration depend only on m1 / m2 ? (If it depends on the actual values of m1 and m2, put 'no'.)

(c)Is there a net (non-zero) torque?

(d)Given particular values of m1, m2, and L1, is it always possible to choose L2 (with L2 > L1) such that the masses have no angular acceleration?



The Attempt at a Solution


I tried yes yes cannot tell and yes..

where did I go wrong ?
out of six tries this is my last one.. Please help .. PLEASE.
 
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Answers and Replies

  • #2
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Start by drawing a diagram of the situation; label all masses, distances and forces.
If you're short on time I'd take a close look at the wording of part (d) specifically ;)
 

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