In this lesson, we will learn how to calculate the drag force acting on objects moving at various speeds through various fluids.

Q1:

A car has a frontal area of 2.10 m^{2} and a drag coefficient of 0.583. The car drives through air of density 1.225 kg/m^{3}.

The car drives at a velocity of 62.1 km/h. What is the magnitude of the drag force on the car?

The car drives at a velocity of 90.4 km/h. What is the magnitude of the drag force on the car?

Q2:

A car has a frontal area of 0.722 m^{2} and a drag coefficient of 0.216. The car drives through air of density 1.225 kg/m^{3}.

The car drives at a velocity of 62.1 km/h. What is magnitude of the drag force on the car?

The car drives at a velocity of 90.4 km/h. What is magnitude of the drag force on the car?

Q3:

A spherical bacterium has a radius of 1 . 7 8 × 1 0 − 6 m and its density is 1 . 2 1 × 1 0 3 kg/m^{3}. The bacterium’s drag coefficient is 0.450. The bacterium falls through water of density 1 . 0 0 × 1 0 3 kg/m^{3}. What is the terminal velocity of the bacterium?

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