A trombone has an effective length of 160 cm and the speed, Ask an Expert

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Q. A trombone has an effective length of 160 cm and the speed of sound in air is 345 m/s. Notes are selected by moving a U-shaped tube in or out to change the effective length of the trombone. What should the new effective length be in order to increase the frequency by 12% (one whole note)?

Q. A thin 1 m long copper rod has a mass of 50 g. What is the minimum current that has to flow through the cylinder to levitate in a magnetic field of 1T?

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