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Q. The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. It vibrates with a fundamental frequency of 27.5 Hz. What is the total mass of the wire.

Q. You push with a 20 N horizontal force on a 2 kg mass resting on a horizontal surface against a horizontal friction force of 12 N. What is the acceleration?

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