Q. 9

# Choose the correct alternatives:

A. For a general rotational motion, angular momentum L and angular velocity ω need not be parallel.

B. For a rotational motion about a fixed axis, angular momentum L and angular velocity ω are always parallel.

C. For a general translational motion, momentum p and velocity v are always parallel.

D. For a general translational motion, acceleration an and velocity v are always parallel.

Answer :

For a general rotational motion angular momentum L and angular velocity ω are not parallel when the axis of rotation is not symmetric As and I is not a scalar quantity.

Whereas is translational motion, momentum , where m is scalar so direction of p and v are always same.

Hence correct option is A. and C.

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