Session 3:
Homework

Problem H1

 a. The meter was originally based on the size of the Earth, with the distance from the equator to the North Pole being arbitrarily defined as 10 million m. What is another way to express the distance of 10 million m? b. The Earth is not quite spherical, but for practical purposes we can think of Earth as having a circumference of 40 Mm. Thus, originally the meter was considered to be about 1/40,000,000 of Earth's circumference. Use the Web or reference books to find out how a meter is officially defined today.

Problem H2

Match the metric quantities on the left with the approximate lengths/distances on the right:

 1 gigameter (1 • 109) A. distance a fast walker walks in 10 minutes 1 megameter (1 •106) B. size of an atom 1 kilometer (1 •103) C. waist height of an average adult 1 meter (base unit) D. size of bacteria 1 centimeter (1 •10-2) E. thickness of a dime 1 millimeter (1 •10-3) F. distance from Atlanta to Miami 1 micrometer (1 •10-6) G. width of a fingernail 1 picometer (1 •10-12) H. Earth's distance from Saturn

 Problem H3 A nickel is said to weigh 5 g. How much is 1 kg of nickels worth?

Problem H4

Give the approximate mass of the following volumes of water:

 a. 6.5 L b. 30 cm3 c. 18 mL d. 12 m3

 Problem H5 Why might a student be confused by this question: Which is more, 1.87 kg or 1,869 g? Explain.