Heat is:
A. energy transferred by virtue of a temperature difference
B. energy transferred by macroscopic work
C. energy content of an object
D. a temperature difference
E. a property objects have by virtue of their temperatures
Answer: A. energy transferred by virtue of a temperature difference
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The overall result of the proton-proton chain is
A) 6 H becomes 1 He + energy. B) p + p becomes 2H + energy. C) 4 H becomes 1 He + energy. D) Individual protons are joined into long chains of protons.
You are standing on Earth's equator. Which way is Polaris, the North star?
A) 30 degrees up, due West B) on the northern horizon C) directly overhead D) The answer depends on whether it's winter or summer. E) The answer depends on what time of day (or night) it is.
If a satellite travels at constant speed at all points in its orbit, then its path is
1) a circle. 2) an ellipse. 3) a parabola. It travels at constant speed because 4) the net force acting on the satellite is zero. 5) it is characteristic for a satellite to travel at constant speed in this type of orbit. 6) gravitational force decreases with increasing distance. 7) there is no component of gravitational pull directed along the satellite's path. 8) of inertia.
Sirius is a star with spectral type A and Rigel is a star with spectral type B. What can we conclude?
A) Sirius has a higher core temperature than Rigel. B) Sirius has a higher surface temperature than Rigel. C) Rigel has a higher surface temperature than Sirius. D) Rigel has a higher core temperature than Sirius.