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September 20, 2014

September 20, 2014

Posted by **marie darling** on Friday, March 15, 2013 at 10:09pm.

Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes: __rad/min

How many revolutions per minute do the wheels make?__ rpm

- trigonometry -
**Reiny**, Friday, March 15, 2013 at 10:32pmradius of wheel = 24 inches

one rotation = 2π(24) = 48π inches

in 1 hour it goes 55 miles

= 55x5280x12 inches

= 3484800 inches

number of rotations per hour

= 3484800/(48π) = 23109.29774 rotations per hour

= 385.155 rpm

= 385.155x(2π) radians /min

= 2420 radians/min

check my arithmetic

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