14. A rock with a volume of 4500.0 cm3 has a mass of 1500.0 g. Its density is A. 0.33 g/em B. 0.33 g/cm3 C. 0.033 g/cm3 15. Your concept about an object is usually A. represented by a word or words B. ambiguous and not clear-cut C. a generalized mental image of that object 16. Imagine a 5400 g chunk of aluminum (r = 2.7 g/cm3) and a 192 g chunk of copper (r = 0.096 g/cm3). Which of the following is true? A. The chunk of copper is smaller than the chunk of aluminum. B. The chunk of aluminum is smaller than the chunk of copper. C. Both objects have the same volume. 17. Equations are used to A. describe a property B. define a concept C. describe how quantities vary D. all of the above 18. The system of measurement that is based on human body parts is the A. metric B. US Customary unit C. British D. none of the above 19. How much space something occupies described by its A. weight B. mass c_volume 20. The relationship between the force of attraction between two objects in the universe and the distance between their centers is an example of a A. direct proportion B. inverse proportion C. inverse square proportion 21. The SI units for impulse are --------------------- and