# physics

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A model airplane of mass 0.7 kg is attached
to a horizontal string and ﬂies in a horizontal
circle of radius 5.6 m, making 1.6 revolutions
every 7 s. (The weight of the plane is balanced
by the upward “lift” force of the air on the
wings of the plane.)
The accelaration due to the gravity is 9.81
m/s2.
Find the speed of the plane

• physics -

Forget about the weight data. You would need the lift coefficient and wing area to get the velocity from the weight.

The plane travels 1.6*2*pi*5.6 meters in 7 s.

That is all you need to compute the speed.

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