When a 82 kg free diver holds inspired air in his lungs, he has a body volume of 0.087 m3 .

a. Can he float in fresh water if the specific weight of fresh water equals 9810N/m3 (yes or no)?

b. Given his body volume, how much could he weigh and still be able to float?

A softball is pitched and is moving at a speed of 26 m/s through the air. The projected area of the softball to the air flow is 0.0073 m2 , the density of the air is 1.21 kg/m3 , the coefficient of drag is 0.35, and there is no wind.

d. What is the magnitude of the drag force experienced by the softball?

e. The ball also has a backspin and experiences a lift force (i.e., the magnus effect) directed upwards with a magnitude of 0.57N. What is the magnitude of the total air resistance experienced by the ball?