(From a science quiz that appeared in the weekly magazine The Economist.) Economic history is easier to write than the history of the universe
Nevertheless, most cosmologists now think that when the universe was formed in which of the following manners? A) First there was a Big Bang, then inflation (of space) caused recession (of all matter, away from the Big Bang).
B) First there was inflation, which caused the Big Bang, then recession.
C) First there was a Big Bang. There has not been any inflation yet, but if it comes it will cause recession.
A
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A particle (mass = 6.7 × 10?27 kg, charge = 3.2 × 10?19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
A. 2.0 kN/C B. 1.5 kN/C C. 1.2 kN/C D. 3.5 kN/C E. 2.4 kN/C
A spinning neutron star has been observed at the center of a ________
A) red supergiant B) supernova remnant C) planetary nebula D) protostar
If water at 4°C slightly decreases in temperature, the water
A) contracts. B) expands. C) neither of these
As an object moves from point A to point B only two forces act on it: one force is conservative and does ?70 J of work, the other force is nonconservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy increases. b. the kinetic energy of object decreases, mechanical energy increases. c. the kinetic energy of object decreases, mechanical energy decreases. d. the kinetic energy of object increases, mechanical energy decreases. e. None of the above.