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in Physics by (55.6k points)

(a) A rectangular metal bar has a width of 10 mm and can support a maximum compressive stress of 20 MPa;determine the minimum breadth of the bar when loaded with a force of 3 kN. 

(b) If the bar in (a) is 2 m long and decreases in length by 0.25 mm when the force is applied, determine the strain and the percentage strain.

1 Answer

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Best answer

Cross-sectional area = width × breadth, hence

Percentage strain = 0.000125 × 100

= 0.0125%

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