There were two posts reltaed to this question but both of them are so contradictory; the question goes(adsbygoogle = window.adsbygoogle || []).push({});

a 13,000kg helicopter accelerates upward at 0.41m/s^2 while lifting a 900kg car. to the nearest newton what is the lift force exerted by the air on the rotors?

now one post would be

Fnet = (13000)(9.8) + (900)(9.8)

which in a sense is what we are looking for (but unfortunately, is wrong for some reason)

and so i don't know what piece of hte puzzple im missing; im sure the 0.41m/s^2 comes in at some point. Is it the force required to accerleate the helicopter? If so what would that be.. im lost.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Helicopter problem

**Physics Forums | Science Articles, Homework Help, Discussion**