The peak of the quasar epoch was:
A) when there was still enough dark matter to fuel the supermassive black holes in their bar.
B) when there was still sufficient mass to fuel the supermassive black holes at their center.
C) before the formation of galaxies.
D) before the star formation epoch.
E) before mass had a chance to accumulate at the nucleus.
B
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An LRC circuit has R = 15.0 ?, L = 25.0 mH, and C = 30.0 ?F. The circuit is connected to a 120 V (rms) source with frequency 200 Hz
(a) What is the impedance of the circuit? (b) What is the rms current in the circuit? (c) What is the rms voltage across the resistor? (d) What is the rms voltage across the inductor? (e) What is the rms voltage across the capacitor? (f) If the current in the circuit is given by I = I0 sin ?t, the voltage is given by
A Carnot cycle, operating as a heat engine, consists, in the order given, of
a. an isothermal expansion, an isothermal compression, an adiabatic expansion and an adiabatic compression. b. an adiabatic expansion, an adiabatic compression, an isothermal expansion and an isothermal compression. c. an isothermal expansion, an adiabatic compression, an isothermal compression and an adiabatic expansion. d. an adiabatic compression, an isothermal compression, an isothermal expansion and an adiabatic expansion. e. an isothermal expansion, an adiabatic expansion, an isothermal compression and an adiabatic compression.
Explain why the principle of homogeneity is an important aspect of the cosmological principle
What will be an ideal response?
Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did. b. They don’t have erosion. c. They were hit by fewer meteorites than Earth. d. They are made of different materials than Earth.