SOLUTION :
a.
Young’s modulus
= Stress / strain
= (Force / Area) / (Stretch / Length)
= Force * Length / (Area * Stretch)
= 13.4 * (15.0/100) / ((pi/4 * (8.5/1000)^2) * (3.7/1000))
= 9.573 *10^6 N / m^2 9ANSWER)
b.
Force = k * displacement
=> k = Force / displacement
=> k = 13.4 / (3.7/1000)
=> k = spring constant = 3621.621 N/m ( ANSWER)
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