The beam is made of phenolic, a structural plastic that has the stress€“strain curve shown. If a portion of the curve can be represented by the equation σ = (5(10⁶)ε)^1/2MPa, determine the magnitude w of the distributed load that can be applied to the beam without causing the maximum strain in its fibres at the critical section to exceed ε_max= 0.005 mm/mm.

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150 mm 150 mm 2 m 2 m ±o(MPa) 7 = 5(10°)e e(mm/mm)