p12 056

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56. This is a completely inelastic collision which we analyze using angular momentum conservation. Let m

and v

0

be the mass and initial speed of the ball and R the radius of the merry-go-round. The initial

angular momentum is





0

= 

r

0

× p

0

=

⇒ 

0

= R (mv

0

) sin 53

where 53

is the angle between the radius vector pointing to the child and the direction of 

v

0

. Thus,



0

= 19 kg

· m

2

/s. Now, with SI units understood,



0

=

L

f

19

=

=



150 + (30)R

2

+ (1.0)R

2



ω

so that ω = 0.070 rad/s.


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