At its widest point, the diameter of a bottlenose dolphin is 0.50m. Bottlenose dolphins are particularly sleek, having a drag coefficient of only about 0.090.

a. Using the dolphin's diameter as its characteristic length, what is the Reynolds number as such a dolphin swims at 5.1m/s in 20ºC seawater?

b. What is the drag force acting on the dolphin swimming at this speed?