At its widest point, the diameter of a bottlenose dolphin is 0.50 m. bottlenose dolphins are particularly sleek, having a drag coefficient of only about 0.090. a. what is the drag force acting on such a dolphin swimming at 7.5 m/s? b. using the dolphin’s diameter as its characteristic length, what is the reynolds number as it swims at this speed in 20° c water?

497.00977 N

3742514.97005

Explanation:

= Density of water = 1000 kg/m³

C = Drag coefficient = 0.09

v = Velocity of dolphin = 7.5 m/s

r = Radius of bottlenose dolphin = 0.5/2 = 0.25 m

A = Area

Drag force

The drag force on the dolphin's nose is 497.00977 N

at 20°C

= Dynamic viscosity =

Reynold's Number

The Reynolds number is 3742514.97005

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