Question

What is the power of an airplane of mass 3 000 kg if when on the runway it is capable of reaching a speed of 80 ms from rest in 4.0 s?

Answer 1

Answer:

Explanation:

It the plane is capable of reaching speed of 80 m per second from rest in time 4 seconds, then it's acceleration is:

a =80/4=20m/s2

Thus, the acceleration force of the engine is

F=ma=3000⋅20=60000N=60×10^3N

During this time the plane covers the following distance:

s=at^2/2=20*4*4/2=160m

During this time the plane covers the following distance:

w=f.s=60*10*10*10.160=9.6*10^6J

Then its power:

P=W/T=9.6*10^6/4=2.4*10^6W

ANSWER