Homework Help: Physics

Posted by Mah on Monday, October 10, 2011 at 11:29am.

A Pratt and whitney PW4000 turbofan engine is able to provide a maximum thrust of 2.49 x 100000 N.A Boeing 747-400 airliner has four of these engines. If its mass is 2.72 x 100000 kg, what is its acceleration?

Physics - drwls, Monday, October 10, 2011 at 12:04pm
That will depend upon the aerodynamic drag, which was not provided.

If the drag were zero, the acceleration would be F/m =
4*2.49*10^5/2.72*10^5 m/s^2
= 3.67 m/s^2

Zero drag is a fair approximation at low speeds, e.g. takeoff.

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