What would be the rev/min

Question

A simple model of the core of a tornado is a right circular cylinder that rotates about its axis. If a tornado has a core diamete of 160 feet and maximum wind speed of 120mi / h * r (or 176 ft/sec) at the perimeter of the core, approximate the number of revolutions the core makes each minute. (Round your answer to one decimal place.)

Answer 1

Rev/min is a frequency. You are given diameter and wind speed at the edge.

f is a rate = v/Circ

If you plug in the values given, you get rev/sec and have to convert by multiplying by 60 s/ 1 min.

f = 176 ft/s/(2pi(80 ft))

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