A screw has 4 threads per centimeter and a circumference of 2 centimeters. What is the mechanical advantage of the screw?

A screw’s ideal mechanical advantage is the distance around one turn divided by the distance it advances in one turn. Four threads per centimeter means the thread spacing, or pitch, is 1/4 centimeter. So the mechanical advantage is 2 ÷ 1/4 = 8, which is choice D, 8.

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