# A $1 \mathrm{~m}$ long massless cantilever beam oscillates at $2 \mathrm{~Hz}$, while a $60 \mathrm{~kg}$ mass is attached at the tip of it. The flexural rigidity of the beam (in $\mathrm{kN}-\mathrm{m}^{2}$ ) is__________________(accurate to two decimal places).

## Question ID - 155544 :- A $1 \mathrm{~m}$ long massless cantilever beam oscillates at $2 \mathrm{~Hz}$, while a $60 \mathrm{~kg}$ mass is attached at the tip of it. The flexural rigidity of the beam (in $\mathrm{kN}-\mathrm{m}^{2}$ ) is__________________(accurate to two decimal places).

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Answer Key : (3.10 to 3.20) -

3.10 to 3.20

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A cantilever beam having a rectangular cross-section of width $60 \mathrm{~mm}$ and depth $100 \mathrm{~mm}$, is made of aluminum alloy. The material mechanical properties are: Young's modulus, $\mathrm{E}=73 \mathrm{GPa}$ and ultimate stress, $\sigma_{u}=480 \mathrm{MPa}$. Assuming a factor of safety of $4,$ the maximum bending moment (in $\mathrm{kN}-\mathrm{m}$ ) that can be applied on the beam is_________________(accurate to one decimal place).