Home Physics Work, Energy, Power and Collision Mix The ring R in the arrangement shown can slid…
Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

The ring R in the arrangement shown can slide along a smooth, fixed, horizontal rod XY. It is attached to the block B by a light string. The block is released from rest, with the string horizontal.

A
One point in the string will have only vertical motion.
B
R and B will always have momenta of the same magnitude.
C
When the string becomes vertical, the speeds of R and B will be inversely proportional to their masses.
D
R will lose contact with the rod at some point.

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(a, c)

There are no horizontal forces acting on the ‘R plus B’ system. Hence, its centre of mass will move down vertically, and horizontal momentum will be conserved.

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