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Vera_Pavlovna [14]
3 years ago
14

A 7.0kg skydiver is descending with a constant velocity

Physics
1 answer:
Pavel [41]3 years ago
4 0

Answer:

Air resistance: 68.6 N

Explanation:

For the skydiver falling down, there are two forces acting on him:

- The force of gravity, of magnitude

W=mg

where

m = 7.0 kg is the mass of the skydiver

g=9.8 m/s^2 is the acceleration of gravity

This force acts in the downward direction

- The air resistance, R, in the upward direction

So the net force on the skydiver is:

\sum F=mg-R

According to Newton's second law of motion, the net force is also equal to mass times acceleration:

\sum F=ma

However, in this problem the skydiver is falling at constant velocity, so his acceleration is zero:

a=0

Therefore, the net force is zero:

\sum F=0

And so we can find the magnitude of the air resistance, which is equal to the weigth of the skydiver:

mg-R=0\\R=mg=(7.0)(9.8)=68.6 N

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