The first few hundred million years of the solar system's history is referred to as the
A) heavy bombardment
B) big bang
C) Hadean eon
D) early pelting
A
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The second stage of planetary evolution is _____
A) cratering and giant basin formation B) ozone layer formation C) differentiation D) slow surface evolution
Phase Angles: A series ac circuit has voltage supplied to it at a frequency of 25.0 kHz with a phase difference between the current and the voltage of magnitude 0.80 rad. If the circuit has a capacitance of 2.0 ?F and an inductance of 0.030 H, find the resistance of the circuit.
A. 4.6 k? B. 0.23 k? C. 19 k? D. 2.06 k?
Why is the CMB so cool now?
A. Energy from the CMB was transformed into dark energy. B. The expansion of the Universe has stretched the radiation to longer wavelengths. C. Clouds of dust have blocked or scattered most of the radiation. D. The radiation's energy drives the expansion of the Universe.
A pencil balanced on its tip such that it does not move
A) is in unstable equilibrium. B) is in stable equilibrium. C) has a net torque acting on it. D) has a net vertical force. E) has a zero moment of inertia.