An observer on a planet sees a spaceship approaching at 0.5c. A beam of light projected by the ship would be measured by this observer to travel at:
A) 0.25c.
B) 0.5c.
C) c.
D) 1.5c.
E) 2.5c.
C
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An atom consists of (check all that apply)
A. negatively charged protons in a nucleus orbited by positively charged electrons. B. positively charged protons in a nucleus orbited by negatively charged neutrons. C. electrons in a nucleus orbited by protons. D. None of these choices are correct.
What is the product of 11.24 and 1.95?
A) 22 B) 21.9 C) 21.92 D) 21.918 E) 21.9180
Which of the following particles is (are) considered to be elementary?
a. the neutron b. the meson c. the electron d. All of the above.
A supplier wants to make a profit by buying gold by weight at one altitude and selling it at the same price per newton at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude. B) buy at a low altitude and sell at a high altitude. C) disregard altitude because it makes no difference.