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Charlie is riding on his unicycle. If the unicycle's wheel has a radius of 9 inches and makes 2 revolutions every 3 seconds, what is the unicycle's speed in inches per second?

 

-Thank you

 Nov 5, 2018
 #1
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In 3 seconds, the distance that the unicycle travels =

 

2 revs * distance traveled per rev  =

 

2   * 2pi (9)  =  36 pi   inches

 

So...in 1 second  it travels  1/3 of this =    36 pi / 3    =   12 pi inches / sec ≈ 37.7 inches / sec

 

 

cool cool cool

 Nov 5, 2018
 #2
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Thank you very much kind soul! angel

 Nov 5, 2018
 #3
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No prob !!!

 

 

cool cool cool

CPhill  Nov 5, 2018

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