- #1
rhule009
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Homework Statement
going through my a level text i found a prob i cannot solve
Homework Equations
1) a helicopter of total mass 1000kg is able to remain in a stationary position by imparting a uniform downward velocity to a cylinder of air below it of effective diametre 6m. Assuming the density of air to be 1.2 kg/m^3, calculate the downward velocity given to the air
The Attempt at a Solution
m=1.2*28.27= 33.92 kg
-m2a2=m1a1
stuck i know the ans is 17.2 m/s but i don't know how to get it