p11 049

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49.

(a) We use the kinematic equation ω = ω

0

+ αt, where ω

0

is the initial angular velocity, ω is the final

angular velocity, α is the angular acceleration, and t is the time. This gives

α =

ω

− ω

0

t

=

6.20 rad/s

220

× 10

3

s

= 28.2 rad/s

2

.

(b) If I is the rotational inertia of the diver, then the magnitude of the torque acting on her is

τ = =



12.0 kg

· m

2

 

28.2 rad/s

2



= 3.38

× 10

2

N

· m .


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