SOLUTION: How many revolutions will a circular disk with a diameter of 4 feet have completed after it has rolled 20 feet? Let me see. I am tempted to use C = pi•d times the number o

Question 1208414: How many revolutions will a circular disk with a diameter of 4 feet have completed after it has rolled 20 feet?
Let me see.
I am tempted to use C = pi•d times the number of times the disk has rolled.
C = pi(diameter)(number of feet the disk has rolled).
C = pi(4)(20)
Is my setup correct?
Answer by ikleyn(52863) (Show Source): You can put this solution on YOUR website!
.

To be honest, I do not see any setup here, since this writing does not contain a complete equation.

The way for reasoning and for making setup is as follows.

    Let n be the number of revolutions (same as rotations).

    One rotation provides  =  feet move forward.

    The setup equation is

         = 20  feet.


     The solution is  n =  =  = 1.595727... rotations.

Thank you for asking and have a nice day !

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