uniform circular disc of mass 200 g and radius 4.0 cm is rotated about one of its diameter at an angular speed of 10 rad/s. Find the angular momentum about the axis of rotation
The moment of inertia of the circular disc about its diameter is
I = 14Mr2 = 14(0.200 kg)(0.04m)2
= 8.0 × 10−5 kg−m2
The angular momentum about the axis of rotation is
L = Iω = (8.0 × 10−5kg−m2)(10rad/s)
= 8.0 × 10−4 kg−m2/s = 8.0 × 10−4J−s