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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: NEWTONS LAWS
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[Post New]4 Apr 2008 11:34:54 IST
    Subject: NEWTONS LAWS
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amitp91 (318)

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find accleration of A and B

url=http://www.avatarsdb.com/] [/url]
    
[Post New]4 Apr 2008 12:03:18 IST
    Subject: Re:NEWTONS LAWS
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deedee (2203)

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5kg bloc
2T-5g=5a.................1
 
4kg bloc
4g-T=8a.....................2
 
since itz acc =2a
 
multiplyin equation 2 by 2
 
u get
3g=21a
thus a=g/7
and acc for d other one is 2g/7
 
 
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[Post New]4 Apr 2008 12:06:28 IST
    Subject: Re:NEWTONS LAWS
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amitp91 (318)

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you are absolutely right
url=http://www.avatarsdb.com/] [/url]
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[Post New]4 Apr 2008 18:41:12 IST
    Subject: Re:NEWTONS LAWS
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rathin_123 (55)

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for 5kg block suppose it move"s downword
acc of 5kg blo & 4kg blocksare a1&a2
5g-2t=5a1______ 1
now for 4kg block
t-4g=4a2 
t=4a2+4g______2
from constraint eqn
2a1=a2______3
 
now we put value of t in 1
so   5g-2(4a2+4g)=5a1
5g-8a2-8g=5a1
-3g-8a2=5a1
-3g-16a1=5a1       from 3
a1=-3g/21
a1=-g/7            nagative shows that it(5kg block) wiill moves upward
and a2=2g/14
 
 
 
 
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