In the Orion constellation are stars Rigel, a blue supergiant, and Betelgeuse, a red supergiant. Which star has a greater surface temperature?
A. Rigel
B. Betelgeuse
C. They have the same surface temperature.
D. There is not enough information to tell.
Answer: A
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The internal energy of n moles of an ideal gas depends on
A. one state variable T. B. two state variables T and V. C. two state variables T and P. D. three state variables T, P and V. E. four variables R, T, P and V.
Heavier atoms are not proportionally larger than lighter atoms due to the greater number of protons
A) pulling surrounding electrons into tighter shells. B) squeezed into tighter spaces. C) both of these D) none of these
For a spacecraft going from the earth toward the sun, at what point will the gravitational forces due to the sun and the Earth cancel? [Earth's mass: me = 5.98 × 1024 kg sun's mass: ms = 1.99 × 1030 kg Earth-sun distance: r = 1.50 × 1011 m]
What will be an ideal response?
Astronomers are surprised that the radial-velocity method for detecting planets has not discovered more smaller, Earth-like planets.
Answer the following statement true (T) or false (F)