Practice Name: _________________________________

Problems Date: ________________ Period 1 2 3 4 5 6

1) The speed limit on a certain highway is 72 km/hr. What is this speed in cm/sec?

2) How many cubic decimeters are contained in one cubic meter?

3) Astronomers often use the unit light-year to express intergalactic distances. If light travels

3.00×10¹⁰ cm.sec, and one year is defined as 365.25 days, how many kilometers does light

travel in one year?

4) Gold has a density of 19.3 g/cm³. What is the mass, in kilograms, of one cubic meter of gold?

5) There are 7.0×10⁶ red blood cells in 1.0 mm³ of blood. How many red blood cells are in 1.0 L of blood?

6) My new car can get up to 48.9 miles on one gallon of gasoline (so far). How many kilometers per liter

is this? (1.61 km=1mi; 1L = 0.264 gal)

7) Suppose that gold is selling at $375/ounce. How many milligrams of gold could you buy for one cent?

(16 oz = 1 lb, 1 lb = 454 g)