Help Solve Physics Problem Now: String Unwound from Wheel

[joecocobo]

Need Help Now

A string wound on the rim of a wheel 20 cm in diameter is pulled out at a rate of 75 cm/s. Through how many revolutions will the wheel have turned by the time that 9.0m of string has been unwound? Also how long did it take?

I really need help with this. If you post, please show all work so I can learn how to do this type of problem.

 

[gneill]

joecocobo, welcome to PF.

You'll have to follow the posting template and show your attempt at working on the problem before help/hints/guidance can be offered.

 

[joecocobo]

Homework Statement

A string wound on the rim of a wheel 20 cm in diameter is pulled out at a rate of 75 cm/s. Through how many revolutions will the wheel have turned by the time that 9.0m of string has been unwound? Also how long did it take?

Homework Equations

I don't know any equations to use

The Attempt at a Solution

I honestly don't know where to start, to even make an attempt

 

[DaveC426913]

You may be overthinking it. For starters, separate the question into its two components. They are not related.1] A 9.0m string is wound on the rim of a wheel 20 cm in diameter. How many times is the string wrapped around the wheel?
Do you know the relationship between the diameter of a circle and its circumference?

2] How long will a point on the string take, moving at 75cm/s, to travel 9.0m?
Do you know how to calculate time, given a distance and a velocity?