USE DIMENSIONAL ANALYSIS:

1. The radius of an Al atom is 0.143 nm. How many Al atoms would have to be laid side-by-side to give a row of atoms 1.00 inch long? (Assume atoms are spherical in shape.)

2. A given point on the moon is 240,000 mi from Earth. How long does it take for light from Earth to reach a reflector at that point on the moon and then return to

the Earth if the speed of light is 3.00 x 108 m/s?

3. A spherical steel ball has a mass of 3.475 g and a diameter of 9.40 mm. What is the density of the steel in g/cm3? The volume of a sphere = (4/3)r3