The helium flash converts helium into ________
Fill in the blank(s) with correct word
carbon
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Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of:
A) 3. B) 6. C) 9. D) 12. E) 81.
The equilibrium rule ?F = 0 applies to
A) objects or systems at rest. B) objects or systems in uniform motion in a straight line. C) both of the above D) neither of the above
What is the celestial sphere?
A) The celestial sphere is a representation of how the entire sky looks as seen from Earth. B) The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars. C) The celestial sphere is a model of how the stars are arranged in the sky relative to our Sun, which is in the middle of the sphere. D) It represents a belief in an Earth-centered universe, and hence is no longer considered to have any use.
Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber,
with a temperature of 100°C, and the free end of the gold rod to an ice water bath, with a temperature of 0°C. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. How much heat flows through the two rods in 60 s? The thermal conductivity of silver is 417 W/(m?K), and that of gold is 291 W/(m?K). No heat is exchanged between the rods and the surroundings, except at the ends. A) 8.2 kJ B) 9.5 kJ C) 12 kJ D) 14 kJ E) 16 kJ