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.

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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 or

1 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 kg

Ans. 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?

Ans. 256 kg

0.4 m


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?

Ans. 640 N

0.4 m


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

2/3

Ans. 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


Water level

0.04 m

0.1 m

What is the volume of water displaced by the submerged portion of the cube?

Ans. 0.0004 m3


Water level

0.04 m

0.1 m

What is the weight of the water displaced by the submerged portion of the cube?

Ans. 4 N


Water level

0.04 m

0.1 m

What is the weight of the cube?

Ans. 4 N


Water level

0.04 m

0.1 m

What is the density of the cube?

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


Ans. A

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. high

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


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