What is the angular momentum of a figure skater spinning at 2.8 r e v / s with a

Question

What is the angular momentum of a figure skater spinning at 2.8rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6m , a radius of 14cm , and a mass of 45kg ? Express your answer using three significant figures and include the appropriate units. L=
Part B How much torque is required to slow her to a stop in 4.5s , assuming she does not move her arms? Express your answer using three significant figures and include the appropriate units. |?|=
What is the angular momentum of a figure skater spinning at 2.8rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6m , a radius of 14cm , and a mass of 45kg ? Express your answer using three significant figures and include the appropriate units. L=
What is the angular momentum of a figure skater spinning at 2.8rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6m , a radius of 14cm , and a mass of 45kg ? Express your answer using three significant figures and include the appropriate units. L=
L= L=
Part B How much torque is required to slow her to a stop in 4.5s , assuming she does not move her arms? Express your answer using three significant figures and include the appropriate units. |?|=
Part B How much torque is required to slow her to a stop in 4.5s , assuming she does not move her arms? Express your answer using three significant figures and include the appropriate units. |?|=
|?|=
|?|=
L=

Explanation / Answer

w, angular velocity = 17.59 rad/s

m.o.I of cylinder = mr^2/2

= 45*0.14^2/2

= 0.441

angular momentum = I*w

= 0.441*17.59

= 7.76 kg.m2/s

b. torque = I*angular acceleration

ang. acce,

0 = 17.59 - a *4.5

ang. acc = 3.91 rad/sec^2

torque = 0.441*3.91

= 1.72 N.m

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