Homework Help: math

Posted by greeny on Sunday, August 26, 2012 at 8:41pm.

the wheel ( including the tire) of a sports car under development by one of the Big Three auto companies has an 11 in radius. what would be the car's speed in miles per hour if its wheel are turning 800 rpm?

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800 rev/ 1 min x 60 min/ 1 hr x 2 pi radians/ 1 revolution x 11 in / 1 radian x 1 ft/ 12 in x 1 mi/ 5280 ft
= 52.36ft

Did I do this correctly?

math - greeny, Sunday, August 26, 2012 at 8:41pm
52.36 mi / hr
math - Steve, Monday, August 27, 2012 at 10:44am
11*2pi in/rev * 800rev/min * 1mi/(5280*12)in * 60min/hr = 52.36mi/hr

You are correct

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