Which of the following properties cannot be determined from a spectrum of a star?
A) speed perpendicular to my line of sight B) surface temperature
C) speed towards me or away from me D) chemical composition
A
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Where is the center of the Universe?
A.) The center of the Universe is near a particular distant galaxy, and the Big Bang originated only at that point. B.) The Andromeda Galaxy is at the center of the Universe. Everything expanded from there. C.) There is no center to the Universe. Expansion is happening everywhere. D.) The Milky Way Galaxy is at the center of the Universe. Everything expanded from there. E.) No one knows where the center of the Universe is.
How would sunspots appear if you could magically remove them from the Sun?
A) They would appear blue-white, like Sirius but brighter. B) Because sunspots are dark spots, they would be invisible against the blackness of space. C) They would shine bright orange in color, like Arcturus. D) They would not appear any differently than on the surface of the Sun. E) They would shine only with reflected sunlight, appearing similar to Venus.
The length of the arrow representing an object’s four-momentum on an energy–momentum diagram is directly proportional to
A. The four-momentum’s four-magnitude 
.
B. The relativistic momentum’s magnitude 
.
C. The object’s mass.
D. The object’s speed.
E. The object’s inverse speed.
F. None of the above.
A weight of mass m is at rest at O when suspended from a spring, as shown. When it is pulled down and released, it oscillates between positions A and B. Which statement about the system consisting of the spring and the mass is correct?
A. The gravitational potential energy of the system is greatest at A. B. The elastic potential energy of the system is greatest at O. C. The rate of change of momentum has its greatest magnitude at A and B. D. The rate of change of gravitational potential energy is smallest at O. E. The rate of change of gravitational potential energy has its greatest magnitude at A and B.