Density Problems

1. Calculate the density of an object if 120 g of it occupy 14 cm³

2. A block of wood measuring 10 cm by 25 cm by 5 cm, has a mass of 2.5 Kg.  Determine the density of the wood.

3. An empty 100 mL graduated cylinder has a mass of 91.  When filled to the 100 mL mark with an unkown liquid, it has a mass of 169 g.  Find the density of the liquid.

4. Find the density on an object which displaces 50 mL of water and has a mass of 950 g.

5. Given that the density of gold is 19.3 g/ cm^{3 ,}  determine the volume of a gold ring with mass 75 g.

6. Would an ice cube float or sink in alcohol? Explain.

7. Our classroom measures 12m by 10m by 4m.  If air has a density of 1.29 kg/m^3. What is the mass of air in our classroom.   Is this answer accurate?  Why/why not?

8. A graduated cylinder has exactly 50 mL of water in it.  When a 100 g object is dropped in the cylinder, the level of the water rises to 69 mL.  What is the density of the object?

9.  What is parallax? How do we avoid parallax.  What is a meniscus?

10. How can you use density to identify two substances that look exactly the same?