Question

An aircraft of mass $m$ travels through a distance $s$ on a runway having a coefficient of friction $\mu$, takes off with a velocity $v$ in $tsec$. The average power of the aircraft is:

• A. $m{v}^2$
• B. $m{v}^2/t$
• C. $(2{\mu }_{k}mgs+m{v}^2)/2t$
• D. $({\mu }_{k}mgs+m{v}^2)/t$

Answer 1

Answer: (C)

$(2{\mu }_{k}mgs+m{v}^2)/2t$

Work done by engine=${\mu }_{k}mgs+\frac{1}{2}m{v}^2$
power =$\frac{2{\mu }_{k}mgs+m{v}^2}{2t}$