- #1

Ushitha Dissanayake

- 9

- 0

## Homework Statement

A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m^3). What would be its terminal speed in water (ρ = 1.0 x 10^3 kg/m^3)?

A) 0.05 m/s

B) 1.5 m/s

C) 18 m/s

D) 42 m/s

E) 1200 m/s

## Homework Equations

D=½Cρ*Av^2

where the magnitude of the drag force (D), relative speed = v, drag co-efficient = C, ρ is the air density (mass per volume) and A is the effective cross-sectional area of the body (the area of a cross section taken perpendicular to the

velocity )

v_t=√2*F_g/Cρ*A

where: v_t is the terminal speed, F_g is force gravity, and C, ρ and A is the same as above

## The Attempt at a Solution

Im not sure how to solve this at all, the example that my book gave me involved finding terminal speed by giving me the drag co-efficient as well as the R to find the volume and area for a sphere

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