RRB Group-D Model Paper 11 with answers for online practice

Concept:

• Power: Power is the amount of energy transferred or converted per unit time.
• The unit of power is watt or J/s.
• Its dimensional formula is:$\left[\mathit{M}{\mathit{L}}^2{\mathit{T}}^{-3}\right]$.

Calculation:

Given: v = 700 m/s, m = 50 g = 0.05 kg, n/t = 60 bullets/min ⇒ 1 bullet/sThe power developed by the gun is given by formula -Power = Work done / time$\mathit{P}\mathit{o}\mathit{w}\mathit{e}\mathit{r}=\mathit{n}\times \frac{\frac{1}{2}\mathit{m}{\mathit{v}}^2}{\mathit{t}}$Power=$\frac{\mathit{n}}{\mathit{t}}\times \frac{1}{2}\mathit{m}{\mathit{v}}^2$ $\mathit{P}\mathit{o}\mathit{w}\mathit{e}\mathit{r}=1\times \frac{1}{2}\times 0.05\times {700}^2$ Power = 12250 watt