If you could find a bathtub big enough for Saturn, the planet would
A) explode due to its liquid metallic hydrogen.
B) sink due to its metallic interior.
C) catch fire, as liquid sodium reacts with water.
D) float.
E) precipitate more helium.
D
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What is meant by combined forced and free convection?
What will be an ideal response?
Many of the smallest Jovian moons are most likely
A) captured asteroids and comets B) captured objects from outside the solar system C) small clumps of gas left over from the formation of the host planet D) fragments of other moons
A spaceship traveling very fast relative to you fires a stream of photons at speed c away from you. You measure the photons' speed to be
A) less than c. B) more than c. C) equal to c.
A heat exchanger is to be designed to heat a flow of molten bismuth from 377°C to 477°C. The heat exchanger consists of a 50-mm-ID tube with surface temperature maintained uniformly at 500°C by an electrical heater. Find the length of the tube and the power required to heat 4 kg/s and 8 kg/s of bismuth.
GIVENS
FIND
The length (L) tube and power required (q) to heat 4 kg/s and 8 kg/s of bismuth
ASSUMPTIONS
Steady state
Uniform and constant surface temperature
Losses from the heater are negligible
SKETCH
PROPERTIES AND CONSTANTS
for Bismuth at the average bulk temperature of 427°C
