# Review of Fluid Properties - PowerPoint PPT Presentation

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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

Ans. 320,000 N

Ans. 10%

Ans. float

Ans. 5 cm3

0.4 m

Ans. 0.064 m3

32 kg

Ans. 4 kg

Ans. 2000 kg/m3

Ans. 256 kg

0.4 m

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

1/3

2/3

Ans. 667 kg/m3

Ans. 550 N

Ans. 18,333 Pa

Ans. 36,667 Pa

Ans. 50,000 Pa

Ans. 100,000 N

Water level

0.04 m

0.1 m

Ans. 0.0004 m3

Water level

0.04 m

0.1 m

Ans. 4 N

Water level

0.04 m

0.1 m

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

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)

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