Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A. Star A is hotter and smaller than Star B.
B. Star A is cooler and bigger than Star B.
C. Star A is hotter and bigger than Star B.
D. Star A is cooler and smaller than Star B.
Answer: A
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Density: Substance A has a density of 3 g/cm3 and substance B has a density of 4 g/cm3. In order to obtain equal masses of these two substances, what must be the ratio of the volume of A to the volume of B?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
E. 
= 
A triangle has sides of length 7 cm and 11 cm. If the triangle is a right triangle, which of the following could be the length of the third side, to the nearest centimeter?
a. 11 cm b. 8 cm c. 16 cm d. 17 cm e. 7 cm
Describe evidence of crustal movement (horizontal or vertical) on Venus. Select all that apply.
a. Large composite volcanoes. b. Widespread folded mountain ranges. c. Fault and deep chasms. d. Rare folded mountain ranges. e. Coronae.
If astronauts could travel at v = 0.95c, we on Earth would say it takes (4.2/0.95) = 4.4 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 1.4 years b. 14.1 years c. 4.0 years d. 1.3 years e. 0.4 years