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Q. A 230 g, 23-cm-diam plastic disk is spun on an axle byout its center by an electric motor. What torque is required to the motor supply to take the disk from 0 to 1800 rpm in 4.60 s?

Q. A 24.00 kg child is on a swing that hangs from 1.6-m long chains. What is her highest speed if she swings out to a 45° angle?

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