<p>A 4500-kg helicopter accelerates upward at 2 m/s2. What lift force is exerted by the air on the propellers?</p>
<p>I think this is just an F=ma problem.</p>
<p>m is given.</p>
<p>a is given.</p>
<p>The net Force is lift force minus mg of the helicopter. (draw yourself a free-body diagram if necessary)</p>
<p>I agree.</p>
<p>ma = Liftforce - Weight</p>
<p>are u kidding this problem is in my physics hw tonite...xact same problem</p>
<p>fnet=ma
so 4500kg(9.8m/s^2+2.0m/s^2)
=4500kg(11.8m/s^2)
=53100 N
=5.3x10^4 N</p>