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disk

o

PQ R

Wire

T

mg sin

l

mg cos

mg

x=0 x=xm

(a) (b) (c)

x=-xm

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t

T=2 I/

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m1

R

m2

m3

r1

r2

r3

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(a) (b) (c)

Composite

Tennis ball

Wire

Vernier

Stop watch

Bisected pieces

cylinder

of the ball

Stand

calliper

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R int

Rext

h1

h2

r1

r2R

d

R sin R d

o

dm

(a) (c)(b)

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