Sep 4, 2009
20
0
0
Status
Pre-Medical
a swimmer is at the bottom of a 5 m pool, the gauge pressure is (pgh) 0.5 Patm. if the swimmer rises to the surface, by how much does the total pressure change?

A. the total pressure increases by 33 %
B. the total pressure increases by 66 %
C. the total pressure decreases by 33 %
D. the total pressure decreases by 66 %

How I solved it:

at 5 m below surface
total pressure is Patm + gauge pressure (0.5 Patm)
so that is 1.5 atm

at the surface there is no gauge pressure only the Patm
Pressure final/Pressure initial = 1/1.5 = 0.666, which made me conclude that D is the best answer.

However, the correct answer is C. Can someone please explain this!!!!!!
 

unique135

10+ Year Member
Aug 13, 2008
146
1
0
Toronto
Status
Pre-Medical
At 5m below surface, total pressure = 1.5 atm
At surface, total pressure = 1 atm

Change in total pressure = 0.5 atm (33% decrease)