Electrical wire with a diameter of 0.88 cm is wound on a spool with a radius of 28 cm and a height of 23 cm.(a) Through how many radians must the spool be turned to wrap one even layer of wire? rad(b) What is the length of this wound wire? m
23 cm / 0.88 cm 26.1 so you will have 26 turns of wire. Each turn is as long as the circumference of the cylinder, which is 2*28*π 176 cm so 26 x 176 4576 cm wire needed 1 rotation, one turn is 2π, so for 26 turns, you need to rotate by 26*2π radians. .
