Power: If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. be four times as large.
B. be two times as large.
C. decrease to one-half the original power.
D. decrease to one-fourth the original power.
Answer: A
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All the following statements are true. Which one is most important in explaining the tremendous tidal heating that occurs on Io?
A) Io orbits Jupiter on an elliptical orbit as a result of orbital resonances with other moons. B) Io is the closest to Jupiter of Jupiter's large moons. C) Io exhibits synchronous rotation, meaning that its rotation period and orbital period are the same. D) Io orbits Jupiter in the Io torus, and therefore has a surface that is bombarded by many charged particles.
Two identical concrete slabs lie flat and in contact with each other as shown in the figure
If the temperature increases by 40°C, the lower edges opposite the contact edges remained fixed in position, and the lower edges of the contact side remain in contact, at what angle will the slabs be tilted? The coefficient of thermal expansion of the concrete is 10 × 10-6/K. A) 19° B) 0.028° C) 15° D) 1.6° E) The answer depends on the length of the slabs.
Which of the following would be the best radiator of thermal energy?
A) a shiny surface B) a perfectly white surface C) a perfectly black surface D) a metallic surface E) styrofoam
The symbol G is used to represent
a. the acceleration of gravity. b. the universal gravitational constant. c. grams. d. gravity. e. none of the above.