What is the saros cycle?
A) the roughly 6-month period between eclipse seasons
B) the approximately 18-year, 11-day cycle over which the pattern of eclipses repeats
C) the average time between total solar eclipses
D) the average time between a total solar eclipse and a total lunar eclipse
E) the 26,000 year cycle over which Earth's axis sweeps out a cone in space
B) the approximately 18-year, 11-day cycle over which the pattern of eclipses repeats
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Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which steps does the internal energy of the system increase?
a. 1 and 2 b. 3 and 4 c. 1 and 3 d. 2 and 4
A ray of light hits a flat surface at an angle ? and is diffusely reflected. At what angle is it reflected?
1. ? 2. 2? 3. –? 4. unknown
When you and your snowboard are in motion, which of the following can be zero?
A) momentum B) kinetic energy C) mass D) inertia E) none of the above
What are the signs of Q, W, and ?U for the process 
?
A. 0, -, - B. 0, +, + C. +, -, 0 D. +, +, 0 E. -, +, 0 F. Other (specify)