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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

Review of Fluid Properties

Density, Pressure, & Buoyancy

what is the density of water
What is the density of water?

Ans.

1000 kg/m3 or

1 gram/cm3 or 1 gram/ml

slide3
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
The “tip of the iceberg” that is above the water represents what % of the total iceberg?

Ans. 10%

a koosh displaces 5 grams of water when submerged what is the volume of the koosh
A “koosh” displaces 5 grams of water when submerged. What is the volume of the koosh?

Ans. 5 cm3

slide8
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

slide9
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

slide11
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

slide12
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

slide15
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
What is the pressure at the floor when the man from the previous slide stands on one foot?

Ans. 36,667 Pa

slide18
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

0.04 m

0.1 m

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

Ans. 0.0004 m3

slide23

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

slide24
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

slide25
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)

slide26
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

slide27
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

slide28

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

slide29

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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