1) A simple barometer is made by taking a tube that is open at one end and close

Question

1) A simple barometer is made by taking a tube that is open at one end and closed at the other, filling it with fluid, and inverting it so that the open end is submerged in a bowl (open to the atmosphere) of the same fluid. See image below. If the fluid used to make a barometer is water, what will be the height of the column of water in the tube?

2) A cube of material with volume 0.09m3 is found to weigh 9966.6 N in air, and 9084.6 N in water. What is the buoyant force acting on the cube of material when it is fully submerged in water?

3) A U-shaped tube that is open on both ends is filled with a fluid (light gray), a second fluid (dark gray) is then added to the left hand side of the tube. Which of the following is not possible?

4) A cube with mass 0.0216 kg, measuring 3 cm on each side is floating in water. What volume of the cube is above water?

Explanation / Answer

1.

atmospheric pressure using the barometer

Patm=pgh

density of mercury p=13595 kg/m3

atmospheric pressure Patm=101,325 pa

therfore

=>101325=13595*9.8*h

h=0.7605 m or 760.5 mm

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