A hollow cylinder of mass 10 kg rotates about its
own axis with angular speed 50 rad.s-1. If the radius
of cylinder is 40 cm, then the magnitude of the an-
gular momentum of the cylinder about its axis is
(1) 20 JS
(2) 40 JS
(3) 80 JS
(4) 60 JS
Answers
Answered by
1
Answer:
option 4
Explanation:
The moment of inertia of a solid cylinder=mr
2
/2
=
2
1
×20×(0.25)
2
=0.625kgm
2
Therefore kinetic energy=
2
1
Iω
2
=3125J
Angular momentum ,L=Iω
=0.625×100
=62.5Js
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