Physics
Mechanics
Easy
Question
A string is wrapped several times on a cylinder of mass M and radius R. the cylinder is pivoted about its axis of symmetry. A block of mass m tied to the string rests on a support so that the string is slack. the block is lifted up to a height h and the support is removed. (shown in figure)
When the string experience a jerk, a large impulsive force is generated for a short duration, so that contribution of weight mg can be neglected during this duration. Then what will be speed of block m, just after string has become taut
The correct answer is:
When the string experiences a jerk, the large impulse developed is of very short duration so that the contribution of weight mg can be neglected during this time interval.
The angular momentum of the system is conserved, as the tension is internal force for the system
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