A man is swimming in the ocean and breathing through a snorkel.
When his chest is about 1 meter under water, he has a difficult time breathing.
Use the following information:
Patm = 1.01 x 105 Pa
ρwater = 103 kg/m3
ρair = 1.2 kg/m3
g = 10 m/s2
Which expression most nearly gives the force his muscles must exert to push out his chest?