A-level Physics (Advancing Physics)/Stress, Strain & Young's Modulus/Worked Solutions

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1. stress=force/cross-sectional area

       =10/(0.5x10^-6)m
       =20000000Pa

2. cross-sectional area=force / stress

                      =100N / 70MPa
                      =1.428x10^-6 

3. strain=extension/original length

        =2/10
        =0.2

4. Decimal --> percentage

  0.2*100=20%

5. young modulus=stress/strain = (force/area)/(extension/length) = (force x length)/(area x extension) = (50 x 0.7)/(0.05 x (pi x 0.001^2) = 2.23x10^8