Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time.
B) These forces are important only at temperatures below the freezing point of water, which is a temperature that the universe reached at an age of about at 10-38 second.
C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool.
D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
A) These two forces first became distinct at this time.
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At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
A. 32 mW B. 40 mW C. 44 mW D. 36 mW E. 80 mW
Time Dilation: An unstable particle is moving at a speed of 1.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 6.8 × 10-6 s. What is the lifetime of the particle as measured in the rest frame of the particle? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Determine the magnitude and sense (direction) of the current in the 10-? resistor when I = 1.8 A
a.
1.6 A right to left
b.
1.6 A left to right
c.
1.2 A right to left
d.
1.2 A left to right
e.
1.8 A left to right
A car traveling at 30 mph skids to a stop in 60 meters. If a car travels at 60 mph with the same skid conditions, then what is distance the car skids to come to a stop?
A. 340 m B. 310 m C. 260 m D. 240 m E. 190 m