• # question_answer A wooden beam of rectangular cross-section 10 cm deep by 5 cm wide carries maximum shear force of 2000 kg. Shear stress at neutral axis of the beam section is: A) Zero                             B) $40\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}$C) $60\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}$                  D) $80\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}$

${{\tau }_{N.A}}=\frac{3}{2}{{\tau }_{mean}}=\frac{3}{2}\times \frac{2000}{10\times 5}$ $=60\,\text{kgf/c}{{\text{m}}^{\text{2}}}$