A 2.8 meter wire with square cross section of 1.2 mm by 1.2 mm stretched 1.43 mm when it supported a 17 kg mass. Cut a length of this wire 0.28 m long and hang a 17 kg mass from it. How much will this short wire stretch, in millimeters? stretch = mm

0.143 mm

Explanation:

Given

Length of wire

Cross-section of wire

Extension in  wire on application of load

Mass of support

Weight of support

Extension in the wire is given by

where E=Young's Modulus

substitute values

When wire is cut for length of

extension is given by

divide 1 and 2 we get

well clustered together.

points close on a scatter diagram