Why do we think Mercury contracted within about a billion years after it formed?
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The surface of Mercury is marked by long, high cliffs. Such features result from tectonic compression, but there are no corresponding features due to tectonic stretching. This suggests the whole planet contracted as it rapidly cooled in its early history. We can date the contraction from the age of the volcanic flows on its surface: volcanic (and all geologic) activity probably came to an abrupt halt as a result of the planet's contraction.
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A 5 cm diameter exhaust pipe at 700 K has an opaque outer surface and emissivity of 0.9. A galvanized gray sheet iron tube of 15 cm diameter is placed concentrically around the pipe. If the tube is to have a temperature of no more than 350 K, determine the maximum heat transfer that can be dissipated per unit length of the pipes.
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Entropy: What is the entropy change of 450 g of water when it changes from (a) liquid to steam at its usual boiling point and (b) ice to liquid at its usual melting point? For water, LF = 0.334 MJ/kg, LV = 2.26 MJ/kg.
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The Tully-Fisher relation uses the ________ of the spiral to find its luminosity
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Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest changes the final kinetic energy of the burnout stage by what factor? Assume all other variables, such as the mass of the rocket and the mass of the fuel, do not change
a. It is the same. b. It doubles. c. It quadruples. d. It increases by a factor of 1.693.