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Two metal disks, one with radius ?1 = 2.50 cm and mass ?1 = 0.800 kg...

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Physics

Two metal disks, one with radius ?1 = 2.50 cm and mass ?1 =0.800 kg and the other with radius ?2 = 5.00 cm and mass ?2 = 1.60kg are welded together and mounted on a frictionless axis throughtheir common center as shown to the right. a) A light string iswrapped around the edge of the smaller disk and a 1.50 kg block issuspended from the free end of the string. How far will the masshave to descend to give the system of disks 21.0 J of rotationalkinetic energy? b) How many revolutions has the system of disksmade after the mass has descended a distance of 4.00 m?

Answer & Explanation Solved by verified expert
3.9 Ratings (638 Votes)
The situation can be visualized asThe moment of inertia of the disk system can be calculatedbyPutting the values in SI unitsAssuming the tension in the string is TThe torque on the    See Answer
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