review of fluid properties
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Review of Fluid Properties. Den sity, Pressure, & Buoyancy. What is the density of water?. Ans. 1000 kg/m 3 or 1 gram/cm 3 or 1 gram/ml. George the whale displaces 32 m 3 of water when floating at rest underwater. What is the George’s weight?. Ans. 320,000 N. - PowerPoint PPT PresentationTRANSCRIPT
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Review of Fluid
Properties
Density, Pressure, & Buoyancy
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What is the density of water?
Ans. 1000 kg/m3 or1 gram/cm3 or 1 gram/ml
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George the whale displaces 32 m3 of water when floating at rest
underwater. What is the George’s weight?Ans. 320,000 N
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The “tip of the iceberg” that is above the water represents what % of the total iceberg?
Ans. 10%
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A cube has a density of 500 kg/m3. Will it float or sink
when placed in water?
Ans. float
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A “koosh” displaces 5 grams of water when submerged. What is the volume of the
koosh?
Ans. 5 cm3
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What is the volume of the cube shown below?
0.4 m
Ans. 0.064 m3
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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
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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
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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
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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
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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
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What is the density of the cube that is floating in water
as shown below?
1/3
2/3Ans. 667 kg/m3
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What is the weight of the 55 kg man?
Ans. 550 N
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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
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What is the pressure at the floor when the man from the previous slide stands on one
foot?Ans. 36,667 Pa
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What is the pressure at a depth of 5 m below the surface
of a lake?
Ans. 50,000 Pa
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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
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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
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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
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What is the weight of the cube?
Water level
0.1 m
0.04 m
Ans. 4 N
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What is the density of the cube?
Water level
0.1 m
0.04 m
Ans. 400 kg/m3
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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
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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
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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)
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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
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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
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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
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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