LECTURE PROBLEMS
Jan 4, 2016
Converting units of Length
1. To wire your stereo equipment you need 325 cm of speaker wire that sells for $ 0.15 / ft. What
is the total cost of the wire?
2. The rhinovirus has a diameter of 30 nm. How many virus particles can line up side by side on a
line that is 1.0 inch long?
Converting units of Mass
3. If one strand of fiber optics cable weighs 1.19 x 10-3 lb/min, what is the mass in Kg of a cable
made up of six strands, each with a length of 8.84 x 103 km?
Converting units of Power
4. 75,000 kg of mercury was discharged into a lake that has a surface area of 4.5 mi2 and depth 35
ft. What mass of mercury in grams is contained in each mL of the lake water?
Density Problem
5. The density of Venus is similar to that of each. Mass of Venus is 4.9 x 1024 Kg and diameter is
12,100 km. Find the density of venus in units of g/cm3. Hint: what is volume of a sphere
equation?