Thursday
April 24, 2014

Homework Help: Physics

Posted by Einstein on Saturday, December 15, 2007 at 9:25pm.

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?

I was given this reply:

The air force on the prop blades is what accelerates the helicopter upward.

Use good old Newton's second law:

F = M a

Concern: When I mulplied the mass of the helicopter (4610 kg) by the acceleration (2 m/s^2) the answer was incorrect. What am I doing wrong?

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