Assignment 4

Due in class on February 26

1. Which of the following sources of energy are derived from the Sun? Which are derived from other stars? Explain your answer in each case.

a. Gasoline

b. Coal

c. Nuclear power

d. Wind power

e. Hydroelectric power

f. Geothermal power

g. Solar power

2. Page 509, Review Question 5

3. Use Kepler's law of orbits to calculate Mars' average distance from the Sun if it orbits once every 1.8809 Earth years.

4. What is one piece of evidence in favor of life on Mars? What is one piece of evidence against it? (Hint: you might find the material
at http://serc.carleton.edu/microbelife/topics/nanobes/index.html helpful.)