What value of inductance should be used in a series circuit with a capacitor of 9.0 × 10^-4 mF when designed to radiate a wavelength of 70 m? (c = 3.00 × 10^8 m/s)
a. 3.8 × 10^-4 mH
c. 3.8 mH
b. 1.9 × 10^-4 mH
d. 1.5 × 10^-3 mH
D
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Charge in an Electric Field: An electron is placed in a uniform electric field of 4.5 × 104 N/C that points to the right. (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) (a) What are the magnitude and direction of the force on the electron?(b) If the electron is released from rest, what is its speed after 3.0 ps?
What will be an ideal response?
Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____
a. have supermassive black holes b. are colliding with other galaxies c. create jets d. have large redshifted spectra e. have a fluctuating luminosity
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.
The Earth moves about the Sun in an elliptical orbit. As the Earth moves closer to the Sun, which of the following best describes the Earth-Sun system's moment of inertia?
a. decreases c. remains constant b. increases d. None of the above choices are valid.