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![[Post New]](/templates/default/images/icon_minipost_new.gif) 21 Apr 2008 20:16:21 IST
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(a)2 forces of magnitudes 3P, 2P have a resultant R.if the first is doubled without changing the angle,the magnitude of resultsnt is doubled. find the angle between the forces. (b)If the 1st force is tripled what will happen to the resultant
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WINNERS DON DO DIFFEREN THINGS THEY DO THINS DIFFERNLY
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let the angle b/w the forces be @
therefore, R^2 = 13P^2 + 12P^2 cos@
if 3p bcums 6p
then r = 2r
i.e 4R^2 = 40P^2 + 24P^2cos@
dividing the above two eq
we get
40 + 24cos@ = 52 + 48cos@
10 + 6 cos@ = 13 + 12cos@
6cos@ = -3
cos@ = -0.5
@ = 120 degrees
if first force is tripled....
then resultant becums sq.root of [67/7] times
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size doesnt matter, brains do...
vignesh |
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