The choices below describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar
system.)
A) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours.
B) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours.
C) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days.
D) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months.
C
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Which of the following correctly lists the various parts of the electromagnetic spectrum in the correct order from lowest to highest energy.
A. infrared, ultraviolet, radio waves, gamma rays, visible B. gamma rays, infrared, ultraviolet, radio waves, visible C. radio waves, ultraviolet, visible, infrared, gamma rays D. gamma rays, ultraviolet, visible, infrared, radio waves E. radio waves, infrared, visible, ultraviolet, gamma rays
If a neutral element has the following chemical symbol, how many electrons does it have?
ImageU A) 92 B) 82 C) 235 D) 143 E) none of the above
The neutrino has
A) enormous rest mass, positive charge, and spin quantum number 1/2. B) negligible rest mass, negative charge, and spin quantum number 1. C) negligible rest mass, no charge, and spin quantum number 1/2. D) moderate rest mass, positive charge, and no spin.
An aluminum tube (E 5 72 GPa) AB of circular cross section has a pinned support at the base and is pin-connected at the top to a horizontal beam supporting a load Q 5 600 kN. The outside diameter of the tube is 200 mm and the desired factor of safety with respect to Euler buckling is 3.0. The required thickness t of the tube is most nearly:
(A) 8 mm
(B) 10 mm
(C) 12 mm
(D) 14 mm
