can u give solution ? please explain how to find angular momentum about any point.
can u give solution ? please explain how to find angular momentum about any point.
sarthak , 9 Years ago
Grade 11
Mechanics> can u give solution ? please explain how ...
1 AnswersPushkar Prateek
Most general way of calculating angular momentum about any point 'O' say L then,
Lo = L(com) + M (r rel. to point O X V rel. to point O) (vector sum)
In the given question,
L about origin say Lo
Lo = MR2
/2 + MR2 = 3/2 MR2 ( since, V=R given)
(about COM = I ) + ( consider velocity and position
of COM of disc wrt point O)
Similarily,
L about moving point P on disc Lp
Lp = MR2 /2 + M ( V/2 X R/2) = MR2 /2 + MR2 /4 = 3/4MR2
( consider velocity and position
of COM of disc wrt point P)
Hence answer should be
Lo/Lp = 2:1
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