Turntables for Sale

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Stroboscopic Disc

AP Physics Question help!!!?

A standard 60 cycle fluorescent light goes "out" every time the AC voltage passes through zero. A 33 and 1/3 (r/min) record-player disc can have its speed checked by the stroboscopic action of such a light on a series of equally spaced marks around its rim. What is the smallest number of marks that will permit a viewer to see the same pattern for the moving disc that would be seen for a stationary disc?

A standard 60 hz fluorescent light flashes twice per cycle, 120 times per second, 21600 times in three minutes. In three minutes, your turntable goes through 100 revolutions.

Simplifying, 216 flashes corresponds to 1 revolution. You will need 216 marks.

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	Stroboscopic Discs

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