In the context of helium fusion, if the core of a post-main-sequence star has no nuclear reactions, the star is a__________
A) red giant
B) green giant
C) gray giant
D) yellow giant
A
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What do astronomers typically refer to as "heavy elements"?
A) elements that are heavier than iron B) elements that are heavier than carbon C) elements that are heavier than uranium D) elements besides hydrogen and helium
A turbogenerator produces
A) energy. B) power. C) neither, but transforms energy from one form to another. D) none of the above
What do we mean by a runaway greenhouse effect?
A) a greenhouse effect that starts on a planet but later disappears as gases are lost to space B) a greenhouse effect that heats a planet so much that its surface rock melts C) a process that heats a planet like a greenhouse effect, but that involves a completely different mechanism of heating that doesn't actually involve greenhouse gases D) a greenhouse effect that keeps getting stronger until all of a planet's greenhouse gases are in its atmosphere
Specific Heat: A glass beaker of unknown mass contains 74.0 ml of water. The system absorbs 2000.0 cal of heat and the temperature rises 20.0°C as a result. What is the mass of the beaker? The specific heat of glass is 0.18 cal/g ? °C, and that of water is 1.0 cal/g ? C°.
A. 140 g B. 560 g C. 540 g D. 270,000 g