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Mechanics

Blazing goIITian

Joined:	13 Jan 2007
Post:	1289

22 Oct 2007 11:44:30 IST

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639

NEWTON'S LAWS OF MOTION.....................

None

FIND ACCN. OF BLOCKS A & B...

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Comments (7)

sowjanya gudipati

Cool goIITian

Joined: 13 Oct 2007

Posts: 75

22 Oct 2007 12:12:33 IST

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let the acceleration of block A be a1 and block B a2 and the tension in string attached to A be T.

this implies the tension in string attached block B as 2T.

by using virtual work principal 2Tx2=Tx1

2a2=a1

5g-2T=5a2

T=2a1

5g=2T+5a2

5g=13a2

a2=5g/13

a1=10g/13

'',' Off to a nu start!!

Blazing goIITian

Joined: 13 Jan 2007

Posts: 1289

22 Oct 2007 12:20:53 IST

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plzzzz elaborate...what is virtual work principal..???

tejas patel

Cool goIITian

Joined: 27 Mar 2007

Posts: 36

22 Oct 2007 14:54:45 IST

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VIRTUAL work means the work done by the system is =0\

so t1a1+t2a2+..........tnan=0

this sum can be understod as if block a mpves x b willl move 2x

aNdRoMeDa

Blazing goIITian

Joined: 10 Sep 2007

Posts: 1319

22 Oct 2007 15:10:32 IST

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acceleration of A=2a

& dat of B =a

.....so applying newtons 2nd law...

on B in y- direction......we get...

5g-2T =5a...........1.......since...B is cuming downwards...

on A in x direction....

T =2*2a

=4a...

so substituing T =4a...in ..1

we get....

5g - 8a =5a...

thus....a = 5g/13..

...........

thus ...for A ..acc...is 10g/13..

& for B ,...is....5g/13..

hope u r clear....

Euracle Mc Hertz

Blazing goIITian

Joined: 3 Sep 2007

Posts: 371

23 Oct 2007 13:12:33 IST

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Elaboate it!

Vivek Sarda

Scorching goIITian

Joined: 21 Oct 2007

Posts: 271

23 Oct 2007 13:16:24 IST

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i agree with deedee

SPARTIAN

Blazing goIITian

Joined: 19 Mar 2007

Posts: 585

23 Oct 2007 13:20:54 IST

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draw fbd
u will get
5g-T=5a
t\2=2*a (tension is half in case of 2kg and a is double )
solve u will get
a=5g\13
for A=5g\13
for B =10g\13

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