A negative charge is moved from point A to point B along an equipotential surface. Which of the following statements must be true for this case?
A) The negative charge performs work in moving from point A to point B.
B) Work is required to move the negative charge from point A to point B.
C) No work is required to move the negative charge from point A to point B.
D) The work done on the charge depends on the distance between A and B.
E) Work is done in moving the negative charge from point A to point B.
C
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The Michelson-Morley experiment was designed to measure
A) the relativistic mass of the electron. B) the relativistic momentum of the electron. C) the relativistic energy of the electron. D) the velocity of the Earth relative to the ether. E) the acceleration of gravity on the Earth's surface.
Which of the following hypothetical observations would contradict our theories about the formation and evolution of white dwarfs?
A) discovery of a white dwarf with a surface temperature of 6000 K B) discovery of a white dwarf with a 1.5 Msun mass main-sequence companion C) discovery of a white dwarf with a mass 1.5 times that of the Sun (1.5 Msun) D) discovery of a white dwarf at the center of a planetary nebula
What are the two conditions for an eclipse?
What will be an ideal response?
Which of the following features of the Solar System does the solar nebula hypothesis explain?
A. All the planets' orbits lie in nearly the same plane. B. All the planets orbit the Sun in the same direction. C. The planets nearest the Sun contain only small amounts of substances that condense at low temperatures. D. All of these choices are correct.