Most star names, such as Aldebaran and Betelgeuse, are in __________
a. Latin.
b. Greek.
c. Arabic.
d. English.
e. Italian.
C
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The Local Group
A. contains about 30 member galaxies. B. has the Milky Way as its center. C. is a supercluster. D. is the globular cluster to which the Milky Way belongs. E. None of these choices is correct.
From the center outward, which of the following lists the "layers" of the Sun in the correct order?
A) core, radiation zone, convection zone, corona, chromosphere, photosphere B) core, corona, radiation zone, convection zone, photosphere, chromosphere C) core, radiation zone, convection zone, photosphere, chromosphere, corona D) core, convection zone, radiation zone, corona, chromosphere, photosphere E) core, convection zone, radiation zone, photosphere, chromosphere, corona
A monatomic gas is cooled by 50 K at constant volume when 831 J of energy is removed from it. How many moles of gas are in the sample?
A) 2.50 mol B) 2.15 mol C) 1.50 mol D) 1.33 mol E) none of the above
A large number of 3.8 cm OD pipes carrying hot and cold liquids are embedded in concrete in an equilateral staggered arrangement with center line 11.2 cm apart as shown in the sketch. If the pipes in rows A and C are at 16°C while the pipes in rows B and D are at 66°C, determine the rate of heat transfer per foot length from pipe X in row B.
GIVEN
A large number of pipes embedded in concrete as shown below
Outside diameter of pipes (D) = 3.8 cm
The temperature of the pipes in rows A and C = 16°C
The temperature of the pipes in rows B and D = 66°C
FIND
The rate of hat transfer per foot length from pipe X in row B
ASSUMPTIONS
Steady state, two dimensional heat transfer
Uniform thermal conductivity in the concrete
SKETCH
