Modern telescopes have allowed us to see 13 billion years back into the past.
a. true
b. false
a. true
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Which best describes the appearance of an asteroid?
a. spherical in shape and covered with craters b. spherical in shape with a volcanic surface c. irregular in shape and covered with craters d. irregular in shape with a volcanic surface e. spherical in shape and smooth, dusty surface
Astronaut Skip Parsec visits planet MSU8, which is composed of the same materials as Earth, but has twice the radius. If Skip weighs 800 N on Earth's surface, how much does he weigh on MSU8's surface?
A. 400 N B. 800 N C. 1600 N D. 3200 N
A dam is thicker at the bottom than at the top because
A) water is denser at deeper levels. B) water pressure is greater at deeper levels. C) water is cooler at deeper levels. D) dams look better. E) none of the above
According to the second law of thermodynamics, for any process that may occur within an isolated system, which one of the choices applies?
A) Entropy remains constant. B) Entropy increases. C) Entropy decreases. D) Both A and B are possible. E) Both A and C are possible.