A monatomic ideal gas expands adiabatically from an initial volume of 72 L and an initial temperature of 350 K until its temperature falls to 290 K. What is the final volume of the gas?
A) 95 L
B) 98 L
C) 101 L
D) 104 L
E) 142 L
A
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The process by which a rotating, convecting body of conducting matter, such as in Earth's core or in the Sun's convection zone, can generate a magnetic field is referred to as the _____
A) accordion effect B) Dember effect C) Allais effect D) dynamo effect
What causes the radio pulses of a pulsar?
A) The star vibrates. B) As the star spins, beams of radio radiation sweep through space. If one of the beams crosses Earth, we observe a pulse. C) The star undergoes periodic explosions of nuclear fusion that generate radio emission. D) The star's orbiting companion periodically eclipses the radio waves emitted by the main pulsar. E) A black hole near the star absorbs energy and re-emits it as radio waves.
How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 4.5 J B) 5.4 J C) 6.7 J D) 7.6 J
The period we call the "heavy bombardment" was
A) the first few hundred thousand years of the solar system's history. B) the most recent hundred million years of the solar system's history. C) the first few hundred million years of the solar system's history. D) a period of a few hundred million years that began when the solar system was about 1 billion years old. E) the time during which an asteroid hit the Earth and caused the extinction of the dinosaurs.