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A uniform rod is fixed to a rotating tur...

A uniform rod is fixed to a rotating turntable so that its lower end is on the axis of the turntable and it makes an angle of `20 %` to the vertical. (The rod is thus rotating with uniform angular velocity about a vertical axis passing through one end.) If the turntable is rotating clockwise as seen from above.
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What is the direction of the rod's angular momentum vector (calculated about its lower end) ?

A

vertically downwards

B

down at `20^@` to the horizontal

C

up at `20^@` to the horizontal

D

vertically upwards

Text Solution

Verified by Experts

The correct Answer is:
B
From the relation `vec L = vec r xx vec p, vec L` will be `bot` to `r` and `p`, therefore it's direction will be `20^@`, down to horizontal.
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