With more than two months free ahead and virtually nothing to do, i guess i'll make an attempt to revive this blog...If you ppl have done electrostats, then leave a mesg. I am out of mechanics problems, as is evident from this problem, which i copied directly from the 100P forum..
This problem teaches a few things, and though the mechanics involved is simple, the thought process is cool:
A solid sphere rolling without slipping on a rough horizontal surface with a linear speed 21m/s collides elastically with a fixed, smooth vertical wall. Find the speed of the solid sphere after it has again started pure rolling (in the backward direction) .The radius of sphere being 1m.
9 m/s????
ReplyDeletewe hv received d electrostatics module...aur uski class bhi lag chuki hai
ReplyDeleteis it 52.5 ?
ReplyDeleteMr. Rupela just invented a perpetual motion machine! All one needs is two walls separated by a large distance...
ReplyDeleteAccording to you the velocity increases with each collision..hence obviously wrong.
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ReplyDeleteThis comment has been removed by the author.
ReplyDeleteoops did something hellish,
ReplyDeleteans is 9 right?
9's right..
ReplyDeleteOk...the reason why i gave this one was that it came up in our TS 3 or 4 in another form...try this:
replace the smooth wall by an identical sphere (initially at rest).
Find the terminal speed (at infinite time) of both the spheres. Find the ratio of the times taken by them to acquire this speed..
sphere with v=21 gets final v=6, and other gets 15
ReplyDeleteratio of time is 1:1
one such question came in our ts3 also
ReplyDelete