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imy786
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Homework Statement
A horizontal disc of diameter 10 cm is spinning freely about a vertical axis
through its centre at an angular speed of 80 revolutions per minute. A piece
of putty of mass 7.0 g drops on to and sticks to the disc a distance of 3.0 cm
from the centre. The angular speed reduces to 65 revolutions per minute.
Calculate the moment of inertia of the disc.
Homework Equations
I= MR2
The Attempt at a Solution
R= 0.03
M= 0.007
but if i use the formula I= MR2,,,, what about the informaton they have given of rev/ min this is the angular speed...
not sure the method to do this?