19. Fluid Mechanics

Density

What is Density? | Gravitation | Physics | Don't Memorise

What is density?

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?

 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)?  

How To Calculate Density - With Examples

Intro to Density

What is Density? - Density Explained

 There is not enough information to answer this question. 

You have three objects in front of you. Object A has a volume of <math display=“inline”><mrow><mn>4</mn><msup><mrow><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow><mn>3</mn></msup></mrow></math>. object B has a volume of <math display=“inline”><mrow><mn>7</mn><msup><mrow><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow><mn>3</mn></msup></mrow></math>. and object C has a volume of <math display=“inline”><mrow><mn>10</mn><msup><mrow><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow><mn>3</mn></msup></mrow></math>. They all have the same mass. What is the correct ranking of the objects from most dense to least dense?

Density Practice Problems

You want to verify if a 70-g crown is in fact made of pure gold (19.32 g/cm3 ), so you lower it by a string into a deep bucket of water that is filled to the top. When the crown is completely submerged, you measure that 3.62 mL of water has overflown. Is the crown made of pure gold?

A wooden door is 1 m wide, 2.5 m tall, 6 cm thick, and weighs 400 N. What is the density of the wood in g/cm3? (use g = 10 m/s2)

Suppose a cubic box contains so much air at <math display=“inline”><mrow><mn>0</mn><mi mathvariant="normal" class="MathML-Unit">&#x2103;</mi></mrow></math> that the mass of the air inside is equal to the mass of <math display=“inline”><mrow><mn>1</mn><mo>.</mo><mrow><mn>0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">L</mi></mrow></mrow></math> of water. What would be the side length of such a box?

Density Values & Specific Gravity

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