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1. Find the moment of inertia of the system shown in the figure about the axis shown ?( Ans : 461 kg metre square)
2. A rod of mass m and length l is released from height h as shown in the figure .The collision between rod and point A is elastic whereas the coefficient of restitution for collision between rod and B is ½ , then find
a) Velocity of centre of mass of rod just after collision .( Ans: ( (9gh)/8)^ ½ )
b) Angular velocity of rod just after collision.( Ans: (gh)/(2l*l)^ ½ )
c) Maximum height gain by the centre of the rod after collision.( Ans: 9h/16)
d) Angular velocity of the rod at the maximum height .( Ans: (2gh) ^ ½ / 2l )
3. Four thin rods each of mass m and length l is joined to form a square .Find the moment of inertia of the loop about the axis shown in the figure? (Ans: 2m*l*l/3 )
4. A small disc and a thin uniform rod length L , whose mass is n times greater than the mass of the disc , lie on a smooth horizontal plane.The disc is set in motion , in horizontal direction and perpendicular to the rod , with velocity v , after which it elastically collides with the end of the rod.
a) Find the velocity of the disc ? (Ans : v(4-n)/(4+n) )
b) Find the angular velocity of the rod after the collision ? ( Ans : 12v/( (4+n)*L) )
c) At what value of n will the velocity of the disc after the collision reverses the direction ?( ans: n>4 )
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