Vector A has a magnitude of 3.0 units and makes an angle of -90.0
with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
with the positive x-axis. What is the magnitude of the vector sum of A + B?
A. 1.0 units
B. 6.8 units
C. 4.0 units
D. -6.8 units
B. 6.8 units
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit. D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
Unpolarized light of intensity I0 passes through two sheets of ideal polarizing material. If the transmitted intensity is 0.24 I0, what is the angle between the polarizer and the analyzer?
a. 61° b. 46° c. 61° d. 76° e. 0.81°
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average force during the collision is correct?
A) The truck experiences the greater average force. B) The small car experiences the greater average force. C) The small car and the truck experience the same average force. D) The force experienced by each one is inversely proportional to its mass. E) The force experienced by each one is directly proportional to its mass.
If the Sun suddenly became less massive, what would happen to Earth's orbit?
A) Spacetime around the Sun would become flatter, and the Earth, with its current momentum, would exit its orbit around the Sun. B) Spacetime around the Sun would become less flat, and the Earth would go plunging into the Sun. C) The Earth's orbital distance from the Sun would increase correspondingly. D) The Earth's orbital distance from the Sun would decrease correspondingly.