A refrigerator has an interior volume of 0.500 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa. If the molecular weight of air is 29 g/mol, what is the mass of air inside the refrigerator?
A) 625 g
B) 513 g
C) 447 g
D) 329 g
E) 243 g
A
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The electron density in copper is 8.49 × 10^28 electrons/m3 . The electron charge is e = ?1.60 × 10^?19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is
a. ?1.84 × 10^?6. b. +1.84 × 10^?6. c. ?1.84. d. ?5.43 × 10^5. e. +5.43 × 10^5.
Which two energy sources can help a star maintain its internal thermal pressure?
A) nuclear fusion and gravitational contraction B) nuclear fission and gravitational contraction C) nuclear fusion and nuclear fission D) chemical reactions and gravitational contraction E) nuclear fusion and chemical reactions
Which of the following is one way of stating the principle of relativity?
A) The speed of light is relative to the motion of the observer, provided that the observer is not accelerated. B) Experiments conducted entirely within your own lab will come out differently, depending on the state of motion of the lab relative to other reference frames. C) Observers that are accelerated will see light beams move at something other than lightspeed. D) Light has the same speed for all nonaccelerated observers, regardless of the motion of the source or observer. E) No physical experiment, conducted entirely within your own lab, can tell you how fast you are moving relative to anything outside the lab.
Why does the Sun emit neutrinos?
A) Solar flares create neutrinos with magnetic fields. B) Fusion in the Sun's core creates neutrinos. C) Convection releases neutrinos, which random walk through the radiation zone. D) The Sun was born with a supply of neutrinos that it gradually emits into space. E) The Sun does not emit neutrinos.