Momentum and CollisionHard
Question
A circular disc of radius R is removed from a bigger circular disc of radius 2R such that the circumferences of the discs coincide. The centre of mass of the new disc is αR from the centre of the bigger disc. The value of α is
Options
A.1/3
B.1/2
C.1/6
D.1/4
Solution
In this question distance of centre of mass of new disc is αR ; 
⇒
;
Moment about centre of mass of whole disc should be zero,
⇒
;Create a free account to view solution
View Solution FreeMore Momentum and Collision Questions
Consider an one dimensional elastic between a given incoming body A and B, initially at rest. The mas of B in comparison...Two men ′A′ and ′B′ are standing on a plank. ′B′ is at the middle of the plank and &...A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, ...The angular speed of a body changes from ω1 TO ω2 without appling of inertia. the ratio of radii of gyration i...If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one ca...