The end stage of the life cycle of an extremely high-mass star is a
a. quasar.
b. neutron star.
c. black hole.
d. white dwarf.
c
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Assume all else is unchanged, and the Earth's rotational axis is perpendicular to the ecliptic. As a result, seasonal variations on the Earth would
a. be practically non-existent. b. remain the same as they are at now. c. have the same severity but each season would last twice as long. d. be much more severe.
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A) It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. B) You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. E) When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2.
In what manner have astronomers and physicists made tests to confirm that Einstein's theory of general relativity is actually a proper description of gravitational phenomena?
What will be an ideal response?
What is the common trait of all main-sequence stars?
A) They are all spectral type G. B) They generate energy through hydrogen fusion in their core. C) They all have approximately the same mass. D) They are in the final stage of their lives.