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Q. A 150 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.180 m/s. How much work must be done on the hoop to stop it?

Q. A 6.6 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.63 T pointing up. During the course of 0.20 s, the field is changed to one of 0.25 T pointing down. What is the average induced emf in the coil?

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Category:- Physics
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