The Andes and the Sierra Nevada Mountains began to form during the Mesozoic due to
A) the formation of the Atlantic Ocean.
B) subduction of Pacific oceanic crust beneath North and South American continental crust.
C) rifting between North America and Africa.
D) meteorite bombardment in Mexico.
Answer: B
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An interior wall of a cold furnace, initially at 0°C, is suddenly exposed to a radiant flux of 15 kW/m2 when the furnace is brought on line. The outer surface of the wall is exposed to ambient air at 20°C through a heat transfer coefficient of 10 W/(m2 K). The wall is 20 cm thick and is made of expanded perlite (k = 0.10 W/(mK), ? = 0.03 × 10–5 m2/s) sandwiched between two sheets of oxidized steel. Determine how long after startup will the inner (hot) sheet metal surface get hot enough so that reradiation becomes significant.
GIVEN • Furnace wall suddenly exposed to radiant heat flux FIND (a) How long before reradiation from the heated wall becomes significant. ASSUMPTIONS (a) Reradiation becomes significant when the reradiated flux from the exposed wall exceeds 10% of the incident radiant flux. (b) The oxidized surface of the exposed wall is black.
What is the average value of the magnitude of the Poynting vector at 1 meter from a 100-watt lightbulb radiating in all directions?
a. 1 W/m2 b. 4 W/m2 c. 2 W/m2 d. 8 W/m2 e. 12 W/m2
How many nanoseconds does it take for a computer to perform one calculation if it performs calculations per second?
A) 15 ns B) 67 ns C) 11 ns D) 65 ns
If the entire galaxy (with a diameter of 100,000 light years) were represented by a circle with a diameter of 4,400 km (similar to the width of the continental United States), then how far apart would be the Sun and its nearest stellar neighbor,
Proxima Centauri (which is 4.2 light years away)? A) about 0.2 meters (about the length of an adult's forearm) B) about 200 meters (about 2 football fields) C) about 20 meters (about the size of a large classroom) D) about 2 meters (about 2 long footsteps)