homework: physics?

Question

8 Christine hangs a 3.0 m length of steel wire from the
ceiling and attaches a mass of 2.0 kg to the end of this
wire. She observes that the mass extends the length of
the wire by 3.6 mm. If the diameter of the wire is
0.32 mm, calculate:
a the strain of the wire
b the stress on the wire
c a value of Young’s modulus for the steel.

Answer 1

For tension,
stress = force/area = F/A
strain = length change/length = delta-L/L
Youngs's modulus = stress/strain
F = mg, where m=2
A = pi*d^2/4, where d=0.00032 m
delta-L = 0.0036 m
L = 3 m
Go.