# Problem: The angular momentum of a system remains constant when: A. the total kinetic energy is constantB. when no net external force acts on the systemC. when the linear momentum and the energy are constantD. when no torque acts on the systemE. all the time since it is a conserved quantity

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###### FREE Expert Solution

A. False

Σkinetic energy = ΣTranslational kinetic energy + ΣRotational kinetic energy.

The rotational kinetic energy may be converted to translational kinetic energy without any change in Σkinetic energy. This inter-change changes the angular momentum of the system even though total kinetic energy is constant.

###### Problem Details

The angular momentum of a system remains constant when:

A. the total kinetic energy is constant
B. when no net external force acts on the system
C. when the linear momentum and the energy are constant
D. when no torque acts on the system
E. all the time since it is a conserved quantity