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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Dec 2007 16:23:39 IST
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suppose a blok is as shown in figure:
what is the meaning of max. extension of the spring here.
WHY IS IT NOT EQUAL TO
XMAX. = mg/k.
it is from dc andey but please explain it in ur own words only.
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12 Dec 2007 16:43:41 IST
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hey it's not asking 4 the equ. extension rather the max. extension. see when u leave this bolck when the spring is un extended then the bolck exerts sudden force on the spring which makes it go to n extension of mg/k then also moves ahead because at that instant the velocity of the block isnt zzero.
so to get the max. ext. u hve to apply energy balance to get the max. ext.
so applying the same u get ,
mgX=0.5kX^2
from here u get X=2mg/k
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12 Dec 2007 23:53:34 IST
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yeah i 2 did it ive got it as 2Mg/k
it may b confusing but see it due 2 wait of block d spring extends (ie as wait acts downwards of d block ) n then d sysm executes SHM n as v no dat extension is Mg/x but due 2 restoring force acting upwards compression takes place n hence it is Mg/k-(-Mg/k)=2Mg/k
if u find it useful rate me
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12 Dec 2007 23:55:26 IST
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n anoder 1 it was askd max expansion hence it is d ans
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13 Dec 2007 00:04:21 IST
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plz ans 2 me yaaron rate me
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