Which of the following statements about Mars is not true?
A) We could survive on Mars without spacesuits, as long as we brought oxygen in scuba tanks.
B) We have landed robotic spacecraft on its surface.
C) It has mountains that are taller than the tallest mountains on Earth.
D) Its surface is frozen today, but evidence indicates it had flowing water in the distant past.
A) We could survive on Mars without spacesuits, as long as we brought oxygen in scuba tanks.
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A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 75.3
B. 53.1
C. 23.9
D. 18.9
E. 12.4
Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther b. globular clusters and the Andromeda Galaxy, but not more distant objects c. galaxies that are within 30 megaparsecs, a relatively short distance d. galaxies that are moderately far away, up to about 500 megaparsecs e. galaxies and galactic clusters within a gigaparsec of the Milky Way
One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gas is moving TOWARDS us at 200km/s, what will we detect?
a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than 121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.
Add and and express your answer in milligrams (mg)
A) 7.05 × 107 mg B) 7.05 × 104 mg C) 7.05 × 105 mg D) 7.05 × 106 mg