Physics Question Number 7?

Question

I need helping working out Physics problems once again..

A string weed trimmer utilizes a length of nylon string that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 47 rev/s, and its tip has a tangential speed of 54 m/s. What is the length of the rotating spring? (Chapter 8)

Answer 1

Angular velocity w equal to tangential velocity V divided by the radius R at which this tangential velocity is measured.
w=V/R
R= V/w= 54/( 2 pi 47)=0.18 m
R=18cm