When we say that the electromagnetic and weak forces "freeze out" from the electroweak force at 10-10 seconds after the Big Bang, what do we mean?
A) These forces are important only at temperatures below the freezing point of water–a temperature that the universe reached at an age of about 10-10 seconds.
B) "Freezing out" was a term coined by particle physicists who think that the Big Bang theory is really cool.
C) Prior to this time, the electromagnetic and weak forces could not be distinguished from each other, but they possessed separate identities following this time.
D) Following this time, neither the electromagnetic nor the weak force was ever important in the universe again.
E) Following this time, the electromagnetic and weak forces starting cooling the universe, which is why it is so cold today.
C) Prior to this time, the electromagnetic and weak forces could not be distinguished from each other, but they possessed separate identities following this time.
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A 7.00-? resistor is dissipating 70.0 watts. What are the current through it and the potential difference across it?
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An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. How far past the second lens is the final image formed?
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A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?
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In the text there is a table of coefficients of linear (?) and volume (?) expansions due to temperature changes. For the solid materials in this list, there is a relationship between ? and ? which allows you to find the value of ? if you know ?. Which of the following best describes that relationship?
a. ? = ?3 b. 3? = ? c. ? = 3? d. ?3 = ?