- #1
jrbillbrian
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Homework Statement
A helicopter with a mass of 2090 kilograms accelerates up at 3.13 meters per second per second. What lift force is exerted by the air on the propellers?
m = 2090 kg
a = 3.13 m/s/s
Homework Equations
F = ma ?
The Attempt at a Solution
Force = 2090 kg * 3.13 m/s/s = 6541.7 N
Which is apparently incorrect, then I thought I might have read it wrong and I tried -6541.7, which is also wrong. Can anyone tell me what I am doing wrong? Did I forget to factor something in?