Review of Fluid Properties
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Review of Fluid
Properties
Density, Pressure, & Buoyancy
What is the density of water?
Ans. 1000 kg/m3 or1 gram/cm3 or 1 gram/ml
George the whale displaces 32 m3 of water when floating at rest
underwater. What is the George’s weight?Ans. 320,000 N
The “tip of the iceberg” that is above the water represents what % of the total iceberg?
Ans. 10%
A cube has a density of 500 kg/m3. Will it float or sink
when placed in water?
Ans. float
A “koosh” displaces 5 grams of water when submerged. What is the volume of the
koosh?
Ans. 5 cm3
What is the volume of the cube shown below?
0.4 m
Ans. 0.064 m3
If the cube shown below is divided into 8 pieces of equal volume, what is the mass of one of the smaller cubes?
32 kgAns. 4 kg
A cube of density 2000 kg/m3 is divided into eight identical smaller cubes. What is the density of one of the smaller
cubes?
Ans. 2000 kg/m3
A cube with a density of 4000 kg/m3 is shown below. What
is the mass of this cube?
0.4 m
Ans. 256 kg
A cube with a density of 4000 kg/m3 is placed into water.
Once the cube is submerged, what will be the buoyant force
acting on it?
0.4 m
Ans. 640 N
A cube with a density of 200 kg/m3 is placed in water. Will
it float? What will be the buoyant force acting on it?
Ans. Yes; cannot determine
What is the density of the cube that is floating in water
as shown below?
1/3
2/3Ans. 667 kg/m3
What is the weight of the 55 kg man?
Ans. 550 N
If the total bottom area of the 55 kg man’s feet is 0.03
m2, what is the pressure at the floor when he
stands on both feet?
Ans. 18,333 Pa
What is the pressure at the floor when the man from the previous slide stands on one
foot?Ans. 36,667 Pa
What is the pressure at a depth of 5 m below the surface
of a lake?
Ans. 50,000 Pa
A treasure chest with a top area of 0.5 m2 sits 20 m below the surface of the sea. What is the force acting on the top?
Ans. 100,000 N
What is the volume of water displaced by the submerged
portion of the cube?
Water level
0.1 m
0.04 m
Ans. 0.0004 m3
What is the weight of the water displaced by the
submerged portion of the cube?
Water level
0.1 m
0.04 m
Ans. 4 N
What is the weight of the cube?
Water level
0.1 m
0.04 m
Ans. 4 N
What is the density of the cube?
Water level
0.1 m
0.04 m
Ans. 400 kg/m3
A hovercraft floats on a cushion of air. If the hovercraft weighs 300,000 N,
and has a base area of 340 m2, what is the pressure at the base?
Ans. 882 Pa
An object that weighs 5 N in air appears to weigh only 3 N
when lowered into water. What is the buoyant force
acting on the object?
Ans. 2 N
An object that weighs 5 N in air appears to weigh only 3 N
when lowered into water. What is the volume of water it
displaces?
Ans. 200 cm3 (0.0002 kg/m3)
A 5000 N car is lifted on a hydraulic piston of area 2000 cm2. What force is needed on the connecting 20 cm2 piston
to do this?
Ans. 50 N
The 3000 N elephant on a 5
m2 piston platform is lifted
by a 0.5 N mouse sitting on a ______
piston plunger.Ans. 8.3 x 10-4 m2
An airship is filled with
helium gas and two inflatable
“ballast” bags of air. Which case below
shows the flow of air when the airship rises?
A
B
Ans. A
For the fire extinguisher to
work, the plunger breaks into the
cylinder at point A. Is the gas in the
small internal cylinder at high or
low pressure?
A
water
Ans. high
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