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**Sarah****Guest**

Hey,

I can't figure out this assignment:

Two pulleys of radii 16 cm and 20 cm have their centres 40 cm. Find the length of the piece of string that will be required to pass tightly round the top circles if the strings does not cross over.

Thank youu!!

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,552

I am imagining two pulleys, the smaller one on the left, close together because they are separated by only 4 cm when they are 32 and 40 cm in diameter. The string goes from the top of one pulley to the top of the other pulley.

What is cross over and at what angle from the line drawn from center to center of pulleys are the endpoints you wish to

measure from?

**igloo** **myrtilles** **fourmis**

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