Physics 1st Paper CQ-Mymensingh Board-2021

1. An engine lifts up a body of mass $200 \mathrm{~kg}$ in one minute of $30 \mathrm{~m}$ height building. Efficiency $40 \%$ of that engine damage after one year to buy. $\left[\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right]$

2. The width of the road is $16 \mathrm{~m}$ the difference between outer edge and inner edge is $60 \mathrm{~cm}$ and diameter. $300 \mathrm{~m}, \mathrm{~A}$ board shous maximum velocity $50 \mathrm{kmh}^{-1}$ that fixed up at the curved point. $\left[\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right]$

3. The length of the thread is $80 \mathrm{~cm}$ and diameter of bob is $4 \mathrm{~cm}$ of a simple pendulum on Earth's surface. This simple pendulum vibrates in amplitude of $100 \mathrm{~m}$. The radius of the Earth is $6.4 \times 10^{6} \mathrm{~m}$ and $\mathrm{g}=9.8 \mathrm{~ms}^{-2}$.

4. A body of mass $300 \mathrm{gm}$ is attached with one end of a spring (mass negligence) hanging vertically then it expended $4 \mathrm{~cm}$ freely and if gives some tension on the body to extent $8 \mathrm{~cm}$ amplitude then it starts oscillating $\left[\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right]$

5. A body is tied with a thread of mass $500 \mathrm{gm}$ that rotate in a circular path of diameter $60 \mathrm{~cm}$ with uniform velocity $5 \mathrm{~ms}^{-1}$ in vertically plane. $\left[\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right]$