- #1
logglypop
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1)A cup contain 15cm lvl water. A 29cm straw is place into the cup, at the end of the straw is 1cm from the bottom. If a person sucks on the straw, what gauge pressure is needed at the top of the straw to allow the water to run out of the top and into his mouth.
P=pgh
1000(9.8) .29 = 2842 Pa
2) Approximately how deep below the surface of the ocean must a diver go before the absolute pressure on him 2atm.
P=P0 + pgh
2atm= 1atm + 1000(9.8)h 1atm=100000 Pa
100000 Pa= 1000(9.8)h
h=10m
3) A body having a density of 300kg/m^3 is floating in a container of liquid. If 1/3 of the volume of the body remains above the surface of the liquid, what is the density of the liquid?
1/2*300=100kg/m^3
100+300= 400 Kg/m^3
P=pgh
1000(9.8) .29 = 2842 Pa
2) Approximately how deep below the surface of the ocean must a diver go before the absolute pressure on him 2atm.
P=P0 + pgh
2atm= 1atm + 1000(9.8)h 1atm=100000 Pa
100000 Pa= 1000(9.8)h
h=10m
3) A body having a density of 300kg/m^3 is floating in a container of liquid. If 1/3 of the volume of the body remains above the surface of the liquid, what is the density of the liquid?
1/2*300=100kg/m^3
100+300= 400 Kg/m^3