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What will be the cross-sectional area in mm2 of the prismatical bar of length 5 mm and weight per unit volume of bar is 5 N/mm3 and self weight of the bar is 50 N Where working stress is 50 MPa and ultimate stress is 100 MPa.

What will be the cross-sectional area in mm2 of the prismatical bar of length 5 mm and weight per unit volume of bar is 5 N/mm3 and self weight of the bar is 50 N Where working stress is 50 MPa and ultimate stress is 100 MPa. Correct Answer 2

Concept:
The self-weight of the prismatic bar is given as,

W = γAL
Where, W = weight or applied load of bar, γ = Weight density, A = cross-sectional area, L = Length of prismatic bar

Calculation:

Given:
L = 5 mm, γ = 5 N/mm3, W = 50 N

W = γAL

50 = 5 × A × 5

A = 2 mm2
The cross-sectional area of the prismatic bar is 2 mm2.

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