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Q. what is the ratio of the energy released by the fusion of 1.0kg of hydrogen to tht released by fission of 1.0kg of Uranium 235?

Q. A string is wrapped around a disk of mass m = 1.8 kg and radius R = 0.11 m. Starting from rest, you pull the string with a constant force F = 8 N along a nearly frictionless surface. At the instant when the center of the disk has moved a distance x = 0.12 m, a length d = 0.20 m of string has unwound off the disk.

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