Please, Read the Question Below :)

Question

You can feel a force of air drag on your hand if you stretch your arm out of the open window of a speeding car. [Note: Do not endanger yourself by performing this experiment.] Calculate this force, supposing that D = 0.950, 𝜌 = 1.20 kg/m³, A = 1.60  10^-2 m², and v = 30.0 m/s.

Answer 1

Just use the drag force equation:

Where C_d is the drag coefficient which the problem lists as "D" (C_d = 0.95)

A = 1.60 x 10^-2

ρ = 1.20 kg/m³

v = 30.0 m/s so

F_d (the force of drag, aka drag force) is:

Fd = (1/2)(0.95)(1.60 x 10^-2)(1.20)(30.0)²

Notice that the units will be (m²)(kg/m³)(m²/s²) = kg•m/s² = N