The most fundamental property of a star is its
A) luminosity.
B) abundance of elements besides hydrogen and helium.
C) mass.
D) surface temperature.
E) radius.
C) mass.
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Evaluate the Stanton number for flow over a tube from the data below
GIVEN
FIND
The Stanton number (St) for flow over a tube.
Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
A boat loaded with wood floats in a swimming pool. When the wood is thrown overboard, the pool level
A) rises. B) falls. C) remains unchanged.
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.