A nova is caused by the ignition of ____
a. hydrogen fusion in material on the surface of a white dwarf
b. carbon fusion in a white dwarf core
c. helium fusion in the core of a massive red giant
d. silicon fusion in the core of a high mass star
e. iron fusion in the core of a high mass star
a
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All weather and wind on Earth are a result of convection in the
a. troposphere. b. stratosphere. c. mesosphere. d. ionosphere. e. thermosphere.
Primitive meteorites can be distinguished from other meteorites and terrestrial rocks because they
A) contain a noticeable fraction of pure metallic flakes. B) resemble the composition of Earth's core. C) contain a lot of iron and were used by humans to make iron tools. D) resemble the composition of Earth's mantle. E) resemble the composition of rocks from lava flows that occurred on asteroids very shortly after the formation of the solar system.
First Law of Thermodynamics: In an adiabatic compression, 200 J of work is done on a gas. What is the change in internal (thermal) energy of the gas during this compression?
A. 0 J B. 100 J C. 200 J D. -200 J
A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the particle moves back across the x axis (y = 0), what is the value of its x coordinate?
A. 65 m B. 91 m C. 54 m D. 78 m E. 86 m