The two nuclei used for the fuel in fission bombs are
A) 235Th and 235U.
B) 234Th and 238U.
C) 235U and 239Pu.
D) 238U and 239Pu.
E) 234Th and 239Pu.
C
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Which two properties are most important in determining the surface temperature of a planet?
A) composition and distance from the Sun B) size and chemical composition C) size and atmosphere D) internal temperature and atmosphere E) distance from the Sun and atmosphere
A particle is moving with a certain speed. Its speed and energy are being measured with respect to Earth. When the particle's speed doubles, the energy increases by a factor of 4. What was the original speed of the particle?
A) 0.447c B) 0.488c C) 0.523c D) 0.648c E) 0.800c
How many significant figures are there in the number 46.20?
a) 4 b) 3 c) 2 d) 5
When energy flows as heat from a hotter object to a colder one:
a. the kinetic energy of microscopic particle motions in the hotter object decreases. b. the kinetic energy of microscopic particle motions in the hotter object increases. c. only thermal energy changes in each object; kinetic energy remains the same. d. it does work on the colder object. e. the kinetic energy of microscopic particle motions in both objects increases.