# Math

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If a CD spins at 75 revolutions per minute, hoe long, in seconds, does it take for the CD to rotate through an angle of 1125 ?

• Math -

75 rev/min.

V = (75 / 60) rev/s * 360 deg/rev = 450
deg/s.

t = 1125 deg / 450 deg/s = 2.5 Seconds.

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