a large pulley on a crane pull 201 cm of cable in one full rotation. what is the diameter of the pulley?

Question

how do you do it

Answer 1

One rotation of the pulley pulls 201 cm of cable. 

This cable would be winding around the circumference of the pulley (which I assume to be circular)

 

Circumference = pi times diameter. 

 

201 = 3.14d

 

dividing both sides by 3.14,

201/3.14 = 64 cm diameter

 

Answer 2

Circumference = pi*diameter

 

201 cm = (3.14)*diameter

 

Solve for diameter.