At the center of the Sun, nuclear fusion converts hydrogen into
A) radiation and elements such as carbon and nitrogen.
B) helium, gamma rays, and neutrinos.
C) hydrogen compounds such as methane.
D) radioactive elements such as uranium and plutonium.
E) molecular hydrogen.
B
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A 2.00 kg mass is located at (4.00 m, 0.00 m, 0.00 m) and a 4.00 kg mass is located at (0.00 m, 3.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.33 m, 2.00 m, 0). B. (1.33 m, 1.00 m, 0). C. (1.50 m, 1.33 m, 0). D. (2.00 m, 1.33 m, 0). E. (1.33 m, 1.50 m, 0).
Which of the following statements about lunar phases is true?
A. The full Moon sometimes rises around midnight B. The time between new Moons is two weeks. C. It is possible to have two full Moons during January but not usually during February. D. It is possible to have two full Moons during November but not during December.
Which of the following is not one of the types into which rocks are classified?
a. Igneous b. Orthoclase c. Metamorphic d. Sedimentary
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit. b. squint while looking in that direction. c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. e. reflect the rays from that direction on a shiny metal surface.