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A 250 kg disk of radius 1.5 meters has a rope wrapped around the rim. You...

A 250 kg disk of radius 1.5 meters has a rope wrapped around the rim. You pull on the end of the rope and increase the frequency of rotation by 1 Hz in 2 seconds.

a. What is the angular acceleration in radians/s2?

b. What is the force required to cause the acceleration in the last part?

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Answer #1

Concept - use equation of rotational kinematics to find the angular acceleration and then use Newton’s law of motion for rotational mechanics to find the torque and hence find the force as shown belowwit dt 2A (-f) x (Af) Af 1 H2 / 2S 3.14/Tad/s T MR2 2. M250 1, R = 1.Sm / / FR I F 1 589 Y Y***********************************************************************************************
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