A 0.10 kg piece of copper, initially at 95°C, is dropped into 0.20 kg of water contained in a 0.28-kg aluminum can; the water and aluminum are initially at 15°C. What is the final temperature of the system?
A) 19.2°C
B) 7.89°C
C) 18.3°C
D) 17.8°C
E) 23.7°C
D
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Why is a 1-solar-mass red giant more luminous than a 1-solar-mass main-sequence star?
A) Fusion reactions are producing energy at a greater rate in the red giant. B) The red giant has a hotter core. C) The red giant's surface is hotter. D) The red giant is more massive.
Humans are scientifically classified as Homo sapiens. In this system, the word Homo refers to the
A) family B) genus C) order D) species
What two observable properties of a Cepheid variable are directly related to one another?
A) its luminosity and its mass B) the period between its peaks of brightness and its distance C) the period between its peaks of brightness and its luminosity D) its mass and its distance
If a constant net force is applied to a body, the body is
1) accelerating. 2) moving at constant speed. 3) at rest or moving at constant velocity. If a body is moving at constant velocity, it must have 4) a constant net force acting upon it. 5) constant non-zero acceleration. 6) constant speed. 7) none of the above.