# Physics

(595)Vinyl record spinning at 45rpm. What is the frequency of rotation (in Hz)? What is the orbital time of the vinyl record (in seconds)?

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asked by Lena
1. 60 rpm = 60 revolutions / minute
= 60 revolutions / 60 seconds
= 1 revolution / second
= 1 hertz (Hz)

So what is 45 rpm in Hz?

Orbital time is the shortest time for any point on the record to come back to the previous position, which is the same as the time it takes to make one revolution.

A 45 rpm record would take 60 seconds to make 45 revolutions. How long would it take to make 1 revolution?

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2. Hertz is 1/second and RPM would be 1/minute

hertz * 60 = RPM
RPM / 60 = hertz

therefore 45/60 = 0.75 Hz

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posted by Eddy

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