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September 21, 2025, 02:02:55 pm
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Author Topic: resultant?  (Read 652 times)  Share 

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Martoman

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resultant?
« on: September 06, 2010, 04:09:16 pm »
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PROB 1) I think their answer of is wrong. I create a triangle of sides 20,30 and the angle between them being 150. Using cosine rule yeilds my answer, which is not theirs :S

The second one can be completed with lami's theorm getting 0.3... but when resolving with forces I seem to fail... so could someone resolve the forces for me  :smitten:
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kamil9876

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Re: resultant?
« Reply #1 on: September 06, 2010, 06:22:10 pm »
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I'm assuming that in 2 you are in static equilibrium.

you know that angle between the dotted line and the rope is 60deg.

Let be the tension in the rope, then we know that:



Using this, you can now find which is in fact equal to .
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theuncle

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Re: resultant?
« Reply #2 on: September 06, 2010, 10:13:05 pm »
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Quote from: kamil9876 on September 06, 2010, 06:22:10 pm

Why 0.5g and not just g?

EDIT:
DUH! 0.5kg x g
« Last Edit: September 06, 2010, 10:14:44 pm by theuncle »
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