5.2 Harder Questions

·         

Collins p.106 Q.1-3. (Table of densities below)

1. Objects that will sink. 

 wood in oil (depends on type of wood)

silver in air

gold in mercury

2. dimensions = 0.065 x 0.2 x 0.09 = 0.00117 

mass = 2.22 kg

Density = m/V = 2.22/0.00117 = 1897 kg/m^3

3. If the crown is pure gold, the new volume of the water would be 800+100 = 900cm^3. (Density = m/V, 19.3 = 1930/V, V=100cm^3.) The water level would be greater than 900cm^3 since iron has lesser density (therefore greater volume with the same mass) than gold. 

5.3 Plenary

Remember: 1g/cm³ 

= 1,000kg/m³

Drag'n'Drop Density (in kg per m3).swf Download this file

5.3 Plenary 2 Corrected!

·         

How can you make a cannonball float?

Explanation below…

Density of Iron =  7.9g/cm³ or 7,900kg/m³

Density of Mercury =  13.6g/cm³or 13,600kg/m³

5.3

·         

5.3 describe how to determine density using direct measurements of mass and volume

Density Practical - regular and irregular solids and liquids.ppt Download this file

5.2 Starter 2 - Moon Rock

Density starter - Moon Rock.ppt Download this file

5.3) Density of Irregular Object

Density of Irregular Object

1. m = 109g

2. V = 36 cm^3

3. p = m/V = 109/36 = 3.03 g/cm^3

Density of Liquid (result)

Results: Density of Water (H2O)

1. m(cylinder) = 50g

2. m(cylinder + liquid) = 68g

3. m(liquid) = m(cylinder+liquid)-m(cylinder) = 18g

4. V(liquid) = 19.5 ml = 19.5 cm^3

5. Density = 0.92 g/cm^3