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Q: The principle of conservation of angular momentum for a rigid body is applicable when
  • A. internal forces add to zero
  • B. external forces add to zero
  • C. resultant external moment is zero
  • D. external forces and moments are absent
Correct Answer: Option C - Conservation of angular momentum: A rigid rotating object always rotate at a constant rate and fixed orientation unless influenced by any external torque. It means angular momentum is conserved if external moment is zero. Angular momentum = m.v.r. m→ mass v → linear velocity. r→ radius
C. Conservation of angular momentum: A rigid rotating object always rotate at a constant rate and fixed orientation unless influenced by any external torque. It means angular momentum is conserved if external moment is zero. Angular momentum = m.v.r. m→ mass v → linear velocity. r→ radius

Explanations:

Conservation of angular momentum: A rigid rotating object always rotate at a constant rate and fixed orientation unless influenced by any external torque. It means angular momentum is conserved if external moment is zero. Angular momentum = m.v.r. m→ mass v → linear velocity. r→ radius