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Angular Analogue of Linear Momentum

if net torque...

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if net torque acting on the system is 0, then which of the following is correct: 1- linear momentum of the system is constant 2-angular momentum of the system is constant 3- angular velocity will remain constant 4- force acting on the system must be 0

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Q. Assertion :To conserve linear momentum of a system, no force should act on the system. Reason: If net force on a system is zero, its linear momentum should remain constant.

Q. Assertion :If there is no external torque acting on a body about its center of mass, then the velocity of the center of mass remains constant. Reason: The linear momentum of an isolated system remains constant.

Q. Statement 1: If no external force acts on a system of particles, then the centre of mass will not move in any direction
Statement 2: If net external force is zero, then the linear momentum of the system remains constant.

Q. Select correct alternative :
Statement -1 : Photoelectric effects supports quantum nature of light because electronic charge of the photoelectron is quantized.
Statement -2 : The number of

α

β

particles emitted when

\begin{matrix} 23892 \end{matrix} U

\begin{matrix} 20682 \end{matrix} P b

is 6 and 8.
Statement - 3: If the angular momentum of a system is constant in magnitude then the torque (if any) acting on the system must be perpendicular to the angular momentum.

Q. Assertion :If linear momentum of a particle is constant, then its angular momentum about any axis will also remain constant. Reason: Linear momentum remain constant, if

{\to F}_{n e t} = 0

and angular momentum remains constant if

{\to T}_{n e t} = 0

.

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