A string 4.0 mm in diameter has original length 2.0 m. The string is pulled by...
A string 4.0 mm in diameter has original length 2.0 m. The string is pulled by a force of 200.0 N. If the final length of the string is 2.02 m, Determine:
(a) The stress. (15.92 x 10^6 N/m^2 )
(b) The strain. (0.01)
(c) Young’s modulus. (1.6 x 10^9 N/m^2 )
Homework Answers
a) The diameter of the string, d=4.0mm
This, the radius, r = 2.0mm = 0.002m
Therefore, the area, 
The string is pulled by force, F = 200 N
Therefore, the stress = 
b) The original length of the string, L = 2.0 m
The change in length of the string, 
Therefore, the strain 
c) The Young Modulus=
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