The result of a galactic merger depends on the ________ of each galaxy
Fill in the blank(s) with correct word
size
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Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. When they hit the ground:
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
The magnitudes of two horizontal displacements are 4 m and 9 m, respectively. Given that the vectors may be in either the plus or the minus direction, they cannot be added together to give a total displacement of
a. –13 m. b. –5 m. c. 5 m. d. 13 m. e. 4 m.
The minimum current that will usually kill the average person is
A) 10. A. B) 0.1 A. C) 1. A. D) 0.01 A. E) 0.1 mA.
Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it. B) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.