Diameter of a cylinder

The diameter of the cylinder is 42 cm. How many times does the cylinder turn on a 66m long track?

Correct result:

n =  50

Solution:

D=42 cm m=42/100  m=0.42 m s=66 m  o=π D=3.1416 0.421.3195 m  n=s/o=66/1.3195=50



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