For most of history, the lack of observable stellar parallax was interpreted to mean that ________
A) stars must all lie at the same distance from Earth, on the celestial sphere
B) Galileo's theories of the universe were essentially correct
C) stars were too far away for parallax to be measured with available technology
D) Earth is stationary at the center of the universe
D
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Deuterium is more abundant on Venus than elsewhere in the solar system. What do we think this fact tells us about Venus?
A) It was formed in a part of the solar nebula where deuterium condensed easily. B) It was formed in a part of the solar nebula where deuterium was surprisingly abundant. C) It once had a substantial amount of water in its atmosphere. D) It once had an atmosphere made mostly of hydrogen. E) Its volcanoes outgassed primarily carbon dioxide and deuterium, but little water.
The amount of heat required to raise 1 kg of
pure water by 1 Co is called a) a joule. b) a kilocalorie. c) a Btu. d) a calorie.
In a Voigt solid, if a tensile stress is applied at t=0, the total strain at t=0 is equal to _________.
Fill in the blank(s) with the appropriate word(s).
If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?
A) 31 B) 15 C) 16 D) 30 E) none of the above