The Sun reaches its most southern point at the _____
A) vernal equinox
B) winter solstice
C) summer solstice
D) autumnal equinox
B
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A star on the upper edge of the main sequence denotes that:
A) it has exhausted nearly all hydrogen in its center. B) it has reached stability for the first time. C) it is in the zero-age main sequence. D) it is converted into a brown dwarf.
Which planet is often called our most brilliant "morning star"?
a. Venus b. Jupiter c. Mars d. Mercury e. Saturn
Entropy: When 0.50 kg of water at 0°C freezes, what is the change in entropy of the water? The latent heat of fusion of water is 33,400 J/kg.
A. 0 J/K B. 610 J/K C. -610 J/K D. -17,000 J/K E. 17,000 J/K
As a guide, prepare a similar table showing the order of magnitudes of the thermal resistances of a unit area for convection between a surface and various fluids.
GIVEN • The order of magnitude of convective heat transfer coefficient ( h c) FIND • The order of magnitudes of the thermal resistance of a unit area (A Rc) SOLUTION The thermal resistance for convection is defined by Equation as