if a girl stands on a rotating platform and then suddenly if she getz her hands inwards towardz her then
angularmomentum increases
angular velocity decreases
moment of inertia decreases
moment of inertia increses
wch of the following statement(z) is/are true yy???
11Moment of inertia decreases because since she takes her hands inwards, r is decreasing (r = radius) [ I = Mr2]
Angular velocity increases because angular velocity is inversely proportional to radius.(ω = v/r)
Angular momentum decreases because it is directly proportional to radius.(L = r x P )
1in this case angular momentum L is conserved (no external torque)..
so L = constt. => Iω = constt.
also I decreases as distance of points from axis decreases which implies angular velocity ω increases.
11Oh sorry sorry, I made a silly mistake, just forgot ki angular momentum will remain constant.(I know I shouldn't have, its a very important concept).
Yeah so the answer is only the option (c)
And thanks Euclid for your correct answer. [1]
