Physics, Chemistry, Maths Forum

Rotational dynamics

Rotational dynamics

by Vibhavari Dasagi -
Number of replies: 10

Can anyone plz solve this question?

A cylinder of radius R is placed between an axle(cylindrical) of radius R and outer coaxial cylindrical shell of rad. 3R. Inner axle rotates anticlockwise with angular vel. 'w' and outer shell rotates also anticlockwise with angular vel. '3w'. If there is no slipping at any contact, find the angular velocity of the intermediate cylinder.

In reply to Vibhavari Dasagi

Re: Rotational dynamics

by amit kumar -
from what i think is,

the question appears to be wrong. either the cylinders are rotating in opposite senses or there defenitely slipping is taking place...
In reply to amit kumar

Re: Rotational dynamics

by Vibhavari Dasagi -
Are you sure? How do you generally solve problems like these? Suppose, in the question, it is w(1) and w(2) instead of w and 3w ( in the same sense), then how would you go about solving it? 
In reply to Vibhavari Dasagi

Re: Rotational dynamics

by Manoj Tirukodi Radhakrishn -
The question has no head or tail can u please give its solution !! well i did get w but thats after drastic assumptions anywayzzz pls pls post the solution
In reply to Manoj Tirukodi Radhakrishn

Re: Rotational dynamics

by Vibhavari Dasagi -
If I had known the solution, I'd have posted it before, Manoj. The whole point IS I dunno the solution. I just knew the answer. Anyways, how did u get the answer? (Solution please :-D )
In reply to Vibhavari Dasagi

Re: Rotational dynamics

by amit kumar -
well the way to tell that the ques os wrong is this...

the inner cylinder wants to make the middle cylinder go anticlockwise while the outer wants it to go clockwise. thus there must be slipping at one point... while the ques says that there is absolutely no slipping...

you can solve these ques by taking conservation of angular momentum, and using v=rw(for no slipping...)