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OpenStudy (anonymous):
A frictionless pulley has the shape of a uniform solid disk of mass 2.40kg and radius 10 cm. A 1.80kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the system is released from rest. a) How far must the stone fall so that the pulley has 3.70J of kinetic energy? b) What percent of the total kinetic energy does the pulley have?
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OpenStudy (vincent-lyon.fr):
tip1: how many energies are needed to understand this problem? tip2: is the whole system conservative?
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