- #1
lemon
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1. A copper wire has length 200cm and radius 0.40mm. A mass of 1.00kg is suspended from the end and allowed to come to rest. The Young modulus of copper is 130Pa. Calculate:
a) the stress
b) the strain
c) the extension
d) the elastic energy stored
Repeat the calculations for the case of a carbon fibre of Young modulus 7500GPa.
2. stress=F/A
strain=deltax/L
E=stress/strain
let gravity=-10m/s
let deltax = ^x
3.
a) F = 1.0kg x 10m/s = 10N
Stress = 10/π0.00042=25000Pa, 25kPa
b) Now I'm already stuck because I don't have ^x to calculate the strain.
a) the stress
b) the strain
c) the extension
d) the elastic energy stored
Repeat the calculations for the case of a carbon fibre of Young modulus 7500GPa.
2. stress=F/A
strain=deltax/L
E=stress/strain
let gravity=-10m/s
let deltax = ^x
3.
a) F = 1.0kg x 10m/s = 10N
Stress = 10/π0.00042=25000Pa, 25kPa
b) Now I'm already stuck because I don't have ^x to calculate the strain.
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