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Q. A nylon string on a tennis racket is under a tension of 270 N. If its diameter is 0.96 mm, by how much is it lengthened from its untensioned length of 29.0 cm?

Q. A 220 g block on a 50.0 cm-long string swings in a circle on a horizontal, frictionless table at 95.0 rpm. what is the tension on the string.

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