What were the two primary courses of heating that let the Earth differentiate?
What will be an ideal response?
Impacts of interplanetary debris and radioactive decay.
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The ratio of electrical force, Fe, to the gravitational force Fg, between two electrons is
A) 2.1 × 1042 B) 4.2 × 1042 C) 6.3 × 1042 D) 8.4 × 1042 E) 9.8 × 1042
LR Circuits: The figure shows a circuit. The ideal battery has a constant terminal voltage of ? = 27 V, the inductance is L = 0.40 H, and the resistances are R1 = 12 ? and R2 = 9.0 ?. Initially the switch S is open with no currents flowing. Then the switch is suddenly closed.(a) What is the current in the resistor R1 the instant after the switch is closed?(b) After leaving the switch has been closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Fill in the blank(s) with the appropriate word(s).
What type of dunes exist on Titan?
A. dust dunes B. sand dunes C. ice crystal dunes D. We have not discovered any dunes on Titan.
According to our theory of solar system formation, why did Uranus and Neptune end up to be much less massive than Jupiter and Saturn?
A) The colder gas in the outer regions of the solar nebula had less gravity and therefore could not gather up into such large balls as it could closer in. B) Ices were able to condense at the distance of Jupiter and Saturn, but only rock and metal could condense at the distances of Uranus and Neptune. C) Particles in the solar nebula were more spread out at greater distances, so that accretion took longer and there was less time to pull in gas before the solar wind cleared the nebula. D) The size differences are thought to be a random coincidence.