# Determine the length of wire in feet in a coil of 65 turns if the average diameter of the coil is 27.20 inches.

Question
Circles
Determine the length of wire in feet in a coil of 65 turns if the average diameter of the coil is 27.20 inches.

2020-12-03
Use the circumference formula with diameter d:
$$\displaystyle{C}=π{d}$$
There are 65 turns so we consider 65 times the circumference:
$$\displaystyle{65}×π{\left({27.20}\right)}={1768}π$$ inches
We need the answer in feet. Recall that 1 foot = 12 inches so:
$$\displaystyle{1768}π\in{c}{h}{e}{s}×{1}{f}\frac{{t}}{{12}}\in.={\left({442} ### Relevant Questions asked 2021-02-19 How many turns of wire would be required to make a 130-mHinductance out of a 30.0-cm-long air-filled coil with a diameter of5.2 cm? asked 2021-04-15 A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure below. The length of the arc ABC is 235 m, and the car completes the turn in 33.0 s. (Enter only the answers in the input boxes separately given.) (a) What is the acceleration when the car is at B located at an angle of 35.0°? Express your answer in terms of the unit vectors \(\displaystyle\hat{{{i}}}$$ and $$\displaystyle\hat{{{j}}}$$.
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