Physics- waves and energyWatch
i need help with this question why do we use the circumference of a circle over the area of a circle? Also once I calculated the energy how I know whether or not the string breaks?
The string is fixed at one end and wrapped around a tuning peg of radius 3.0 mm at the
other. The tuning peg needs to be turned through 3 complete rotations to increase the
tension in the string from 0 to 70 N in part (c).
Discuss, by estimating the energy stored in the string, whether there is a significant risk to
the guitar player when the string breaks.
The question is about energy stored in the spring, energy stored is proportional to extension squared, to work out the extension when it's wrapped around a circle you would use the circumference of the circle and not the area. If it were wrapped around a pentagon you'd use the perimeter of that.