WHAT IS NASA PHYSICS?
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May the Forces be with You
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Assessment Problems 7
Useful Things
SITE MAP
Fluids: Liquids and Gases
Pressure in Liquids
Solve This! - An Extraterrestrial Problem
Radar mosaic of Legia Mare on Titan, about 350 x 420 km wide. NASA.
The P = ρgh equation means that pressure depends on depth within a liquid-filled container. So if the pressure at 10 m depth in a terrestrial lake is 9.8 x 10^{4} Pascals, for 20 meters depth it is twice as much (19.6 x 10^{4} Pa), and for 100 m is 10 times more (9.8 x 10^{5} Pa).
The increase in pressure with depth is dramatically illustrated by punching small holes at different depths in a tall, empty milk carton. When filled with water, the liquid coming out the bottom hole squirts further than water from higher holes because the pressure is greatest at the bottom.
Image: modified from © vectorlib.com - Fotolia.com
Answer: 5,684 Pascals
P = ρgh = 421 kg/m^{3} * 1.35 m/s^{2} * 10 m
P = 5,684 Pa
Answer: 6%
PT/PE = 5684/98000 = 0.06
The pressure at the bottom of the Titan lake is only 6% as much as for the Earth lake.
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