Which one of the below is not correct? The momentum of a system remains constant

Question

Which one of the below is not correct? The momentum of a system remains constant when the net force acting on it is zero, and thus the momentum of such systems is conserved. The momentum of a body remains constant if the net force acting on it is zero. Momentum is conserved in general, even if the net force acting on a body is not zero. Linear momentum does not change unless a force acts on it. Angular momentum does not change unless a torque acts on it. Two rigid bodies having the same mass and angular speed may have different angular momentums unless they also have the same moment of inertia I. Which one of the below is wrong? The relationship between the time rates of change of an extensive property for a system and for a control volume is expressed by the Reynolds transport theorem (RTT). Reynolds transport theorem (RTT) provides the link between the system and control volume concepts. Linear momentum is the product of mass and velocity, and its direction is normal to the direction of velocity. The momentum-flux correction factor beta enables us to express the momentum flux in terms of the mass flow rate and mean flow velocity and is unity for uniform flows. Newton's second law is also expressed as the rate of change of the momentum of a body is equal to the net force

Explanation / Answer

10.

(A) Fnet = 0

and Fnet = dp/dt = 0

that means change in momentum is zero.

- Correct

(B) similar to (A)

- correct

(C) INcorrect. (Contradict A)

(D) true. To change momentum extrenal non zero forces is needed.

(E) angular momentum = I w

so angular momentum depens on moment of inertia not on mass.

correct

Ans(C)

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