Answered

At a speed of 22 revolutions per minute, how long will it take a wheel of radius 10,

rolling on its edge, to travel 10 feet? (Assume p equals 22/7, and express answer to

nearest 0.1 second.)

Verified Answer :

Well, if the radius is 10, then the circumference is \(\frac{2*10*22}7=\frac{440}7\)
What's the unit? Either way, 22 rev. per minute means each minute you go by \(22*\frac{440}7=\frac{9680}7\) units per second. Now you got the linear speed, just find out the time by dividing the distance by the speed!
So, what's the unit for the radius?

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