In order to be able to directly see the Sun's motion due to Jupiter's gravity, an observer at a distance of 30 light-years would need to be able to measure changes in its position of ________
A) 0.0005 arcsecond B) 0.05 arcsecond C) 0.005 arcsecond D) 0.5 arcsecond
A
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Which of the following is most likely to undergo a white dwarf supernova?
A) a main-sequence star of spectral type O B) a main-sequence star like our Sun C) an isolated white dwarf (not in a binary system) D) a close binary system in which both stars are white dwarfs E) a pulsar
An electron with kinetic energy 2.80 eV encounters a potential barrier of height 4.70 eV. If the barrier width is 0.40 nm, what is the probability that the electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 3.5 × 10-3 B) 7.3 × 10-3 C) 1.4 × 10-2 D) 2.9 × 10-3 E) 3.5 × 10-2
The process in which some substances may remain in a liquid state even though their temperature may dip below the freezing point is known as ________
What will be an ideal response?
Which is a reasonable restatement of the second law of thermodynamics?
a. The orderliness of the universe increases. b. All heat engines exhaust heat to their surroundings. c. Force equals mass times acceleration. d. Single-temperature heat engines can be built. e. Heat sometimes flows spontaneously from colder to warmer objects.