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500 yards per minute = 500/60 yards per second = 0.9144*500/60 metres per second = 7.62 m/sec
12 to the second power is 144...2 to the second power is 4, any # to the second power is the # times itself.
500 of them.
Period = (1) divided by (frequency) = 1/500 = 0.002 second
The exponent is 2 - from the SECOND power.