Thursday, 30 October 2014

DENSITY PROBLEMS

1) If you take 1 cm3  of iron ( A small cube) and 1 cm3 of wood, which cube will be lighter (smaller mass ?) ___________
If you measure the mass of 1 cm3 of iron you get 8g. The same volume of oak wood (1cm3) has a mass of 0.7g. We say the density of iron is 8g
 cm3  and the density of wood is 0.7g/ cm3     .
Density is the mass of 1 cm3 of matter.
To find the density of a substance, you need to divide the mass (g) by the volume (cm3).
The mass an be in kg and the volume in m3


2) An object has a mass of 100 grams and a volume of 30 cubic centimeters. What is its density?

3) AN object has a mass of 40 000 kilograms and a volume of 5 cubic meters. What is its density>

4) An object has a volume of 3 cubic meters and a density of 6000 kilograms per cubic meter. What is its mass ?

5) Can you explain how a lava lamp works? it has to do with density of water and wax and heat.