Suppose we hang a heavy ball with a mass  m=18 kg (so the weight is m*g ) from a steel wire 3.7 m long that is 3.3 mm in diameter (radius = 1.65×10-3 m). Steel is very stiff, and Young's modulus for steel is unusually large, 2 × 1011 N/m^2. Calculate the stretch deltaL of the steel wire.

deltaL= _____m

This calculation shows why in many cases it is a very good approximation to pretend that the wire doesn't stretch at all ("ideal non-extensible wire").

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Given Mass of the hang ball m 18 kg Length of wire L 37 m Diameter of wire d 33 radius 16510 3 m You... View the full answer