Question

75 kW engine is generating full power. It is able to provide a 700 kg airplane a speed 2.5 ms^-1. Find the fraction of engine power used.

• A. $\frac{1}{100}$
• B. $\frac{3}{100}$
• C. $\frac{3}{100}$
• D. $\frac{7}{300}$

Answer 1

Answer: (D)

$\frac{7}{300}$

Answer 2

$\frac{P_{used}}{P_{\sup ⥂ plied}} = \frac{F.V}{P_{\sup ⥂ plied}} = \frac{700 \times 10 \times 2.5}{750 \times 10^{3}} = \frac{7}{300}$