One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm2 . Then 100 milliliters of oil, with a density 80 that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.
Question 2
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0 105 N/m2 . What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
a. Nothing, it is still at a depth of 1.0 m and the pressure in the water depends only on the depth.
b. It increases by 1.0 105 N/m2, since it is at 1/3 the depth of the water.
c. It increases by 2.0 105 N/m2, since it is at 2/3 the depth from the bottom of the container.
d. It increases by 3.0 105 N/m2.
e. It increases by 3.0 105 N/m2 + 9.8 103 N/m2 since it is 1.0 m deep in the water.
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A thimble of water contains 4.0 x 1021 molecules. The number of moles of H2O is: