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Question: Air streams horizontally past a small airplane’s wings with a speed 70 ms<sup>-1</sup> over the top ...

Air streams horizontally past a small airplane’s wings with a speed 70 ms-1 over the top surface and 60 ms-1 past the bottom surface. Plane has mass 1340 kg and wing area 16.2 m2. Find the net vertical force. Give density of air 1.2 kg m-3.

A

(a) 500 N upward

A

(b) 500 N downward

A

(c) 765 N upwards

A

(d) None of these

Explanation

Solution

(b)

Fnet =

=−500 N= - 500 \mathrm {~N}