Conservation of ____________ is observed in strong and electromagnetic interactions but not in weak interactions
a. baryon number
b. lepton number
c. strangeness
d. charm
e. beauty
c
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Why is the combination of two protons and two neutrons stable, but two protons and one neutron is not?
A) There are not enough neutrons to overcome the electrical repulsion of the protons. B) There are not enough neutrons to overcome the nuclear repulsion of the protons. C) The nuclear attraction between protons is greater than that between neutrons. D) The electrical repulsion between the two protons is greater in one case than the other. E) none of the above
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A) a dense core and plate tectonics B) mantle convection and a thick atmosphere C) significant volcanism and tectonics D) plate tectonics and widespread erosion
Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, with equal speeds relative to Earth. As measured by a passenger in one of the spaceships, the other spaceship is 96 m long
What is the speed of the spaceships relative to Earth? A) c/7 B) c/6 C) c/5 D) c/4 E) c/3
Which of the following is not a good reason to place an observatory on a remote mountain to?
A) reduce the impact of light pollution B) reduce the twinkling caused by Earth's atmosphere C) allow study of infrared light D) allow observations at ultraviolet and x-ray wavelengths