19. Fluid Mechanics

Density

Multiple Choice
A cylindrical specimen of brass has a diameter of $20 mm$ and a height of $100 mm$ . If its mass is $0.27 kg$ , what is the density of the brass in $kg / m^{3}$ ?
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Multiple Choice
Which of the following statements about air is correct?
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Multiple Choice
How can you use an object's $mass$ and $volume$ to predict whether it will sink or float in water?
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Multiple Choice
Which statement is true about the mass and volume of all objects that sink when placed in water?
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Multiple Choice
Suppose an 80 kg (176 lb) person has 5.5 L of blood (1,060 kg/m³ ) in their body. How much of this person's total mass consists of blood? What percentage of the person's total mass is blood?
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Multiple Choice
If you have two solid steel spheres and sphere $2$ has twice the radius of sphere $1$ , how does the density of sphere $2$ compare to that of sphere $1$ ?
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Multiple Choice
Different materials in the body have different densities, and therefore will tend to make a person float or sink to different extents. Which bodily material is most buoyant (helps you stay afloat the most)?
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Multiple Choice
In the context of density, what is the specific gravity of water (relative to water at $4 ° C$ )?
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Multiple Choice
In fluid mechanics, the specific gravity (relative density) of a substance is defined as the ratio of its density to the density of water at $4 ° C$ . Using typical sea-level values $ρ_{air} \approx 1.2 kg / m^{3}$ and $ρ_{water} \approx 1000 kg / m^{3}$ , what is the specific gravity of air?
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Multiple Choice
How does the shape of an object affect the method used to measure its $V o l u m e$ ?
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Multiple Choice
Which phrase best describes air density?
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Multiple Choice
Why does cold air tend to sink in the atmosphere?
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Multiple Choice
Which of the following best describes the relationship between $T$ (air temperature) and $ρ$ (air density)?
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Multiple Choice
Given that the volume of an object is $5 cm 3^{}$ and its mass is $55 g$ , what is its density in $g / cm 3^{}$ ?
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Multiple Choice
You have three objects in front of you. Object A has a volume of $4 {cm}^{3}$ . object B has a volume of $7 {cm}^{3}$ . and object C has a volume of $10 {cm}^{3}$ . They all have the same mass. What is the correct ranking of the objects from most dense to least dense?
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