3
msp
·2009-10-07 09:53:25
dude i think u need to find the maximum extension rite.
In soln A u r rong since at the maximum extension aceleration=-w2x
In soln B i think its correct since u have conserved energy at initial and final states.
i will say dat first think for some more minutes,i am sure u can find which one is rong.
19
Debotosh..
·2009-10-07 10:04:39
this is a very commonly made mistake...we are confusing equilibrium with "rest" !
to apply the first method we need to ensure the position where the acceleration of the body is zero,not its velocity ! in fact, acceleration and velocity,in this case and also in other cases(like shm of pendulum) , are zero at different points of time !
1
Bicchuram Aveek
·2009-10-07 10:07:29
okie understood ....thnx.........................@.msp : any diff. soln. ?
24
eureka123
·2009-10-07 10:13:04
ya organic has given a perfect reply...
mgsinθ=kx doesnt guarantee rest..it just guarantees uniform velocity...
whereas energy conservation guarantees rest to rest situation
1
Philip Calvert
·2009-10-07 10:16:51
am I the only one to notice "ALL surfaces are smooth" ?
even the book seems to have ignored it .. unless of course its a typo or something and not the book's fault
3
msp
·2009-10-07 11:21:08
dude wat i have written is with reference to wedge.
24
eureka123
·2009-10-07 11:23:37
i dont think wedge is moving...........it is fixed...
whenver wedge is moving its normally given clearly..