106ya even i got 250 rotations..
A solid sphere of mass 2.5kg and radius 20cm, placed on a horizontal smooth ground is acted upon by an impulse of 50√Ï€ Ns at a point A as shown in fig. The number of rotations made by the sphere about its diameter before hitting the ground would be
(a) 100 (b) 150 (c) 200 (d) 250
-
UP 0 DOWN 0 0 4
4 Answers
62this is not that tough..
see the linear velocity that it will get is
50√π/(2.5) = 20√π
angular velocity is given by
Iw=50√π.R
w 2/5mR2=50√πR thus, w =125√π/mR thus, w =250√π
angle of projection is 30 degree.
vertical component of velociyt is 10√π
time is 2√π
theta= wt = 500Ï€
no of rotations = 500Ï€/2Ï€ = 250
62sorry iitimcoming..
Now I will leave some of them..
actually board exams have come.. so everyone is busy there.
so no new questions these days....
btw today they had chemistry.. I think it must have been over by now!