2. A 10 kg loggerhead sea turtle has a lung volume of 1 L and a body volume of 9.5 L (lungs empty) or 10.5 L (lungs full). Assume a water density of 1 kg/L. a. The sea turtle fills its lungs on the surface; how much buoyant force is preventing it from sinking (after subtracting gravity)? b. The sea turtle reaches the bottom next to some delicious sea urchins. To eat at leisure, how much air must it exhale to reach neutral buoyancy (zero net force)? Assume the air is compressed insignificantly by water pressure. 3. A bird with a body length of 10 cm is flying at 10 m/s through air (viscosity of 18.27 x 106 Pa s, density of 1.225 kg/m). a. What is the bird's Reynolds Number (Re)? b. Will there be vortices associated with the flow around the bird? Assume similar transition Re as described in class. c. The bird dives into the water, keeping the same speed. What is the new Re? Water has a viscosity of 1.31 * 10- Pa s and a density of 1000 kg/m.