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![[Post New]](/templates/default/images/icon_minipost_new.gif) 1 Feb 2008 15:37:35 IST
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Q2:A wire is elongated by 2mm when a brick is suspended from it.when the brick is immersed in water,the wire contracts by 0.6mm,what's the density of the brick?
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1 Feb 2008 15:47:32 IST
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what do u wanna ask?
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dL = FL / AY .....1 (i am representing delta by d)
=> 2 = mgL/AY = VDgL/AY where D is density of brick
again convert the equation 1 into delta...
d(dL) = (dF) L/AY
=>2 - (-0.6) = VKg L/AY where K is the density of water..
[note that force is changed by dF= VDg - (VDg - VKg) ]
divide both equations to get the answer...
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2 Feb 2008 11:10:15 IST
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i am getting the answer as 10000/3 kg/m^3
i have used the concept of spring constant and buoyancy
nudgme me for soln
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