# Problem: A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is theA. light rock.B. same for bothC. heavy rock.

###### FREE Expert Solution

Viscous drag force:

$\overline{){{\mathbf{F}}}_{{\mathbf{D}}}{\mathbf{=}}\frac{\mathbf{C}\mathbf{A}\mathbf{\rho }{\mathbf{v}}^{\mathbf{2}}}{\mathbf{2}}}$ C is the drag coefficient, A is the effective cross-sectional area of the object, ρ is the density of the fluid, and v is the velocity of the object.

98% (87 ratings)
###### Problem Details

A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the

A. light rock.

B. same for both

C. heavy rock.