Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30° south of west
a. 100 units 30° south of west
c. 87 units 60° south of west
b. 62 units 54° south of west
d. 62 units 15° south of west
B
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Arrhenius was not particularly alarmed by his discovery at the time. What changed that made later scientists become much more concerned about the climate effects of carbon dioxide?
A. Emissions of carbon dioxide rose much faster than Arrhenius had anticipated. B. Scientists discovered errors in Arrhenius’s calculations that made the effects of carbon dioxide much greater than he had expected. C. Scientists became concerned about carbon dioxide only after measurements showed the world was warming substantially. D. Scientists discovered that there is much more natural carbon dioxide in the atmosphere than Arrhenius had thought.
Derive an equation for the net rate of radiant heat transfer from surface 1 in the system shown in the accompanying sketch. Assume that each surface is at a uniform temperature and that the geometrical shape factor F1–2 is 0.1.
GIVEN
? The system shown above
FIND
? An expression for the net rate of radiant heat transfer from surface 1 (q1)
ASSUMPTIONS
? Steady state
? A1 and A2 are gray, A0 is black
? Each surface is at a uniform temperature
? The shape factor F12 = 0.1
PROPERTIES AND CONSTANTS
When we speak of the large-scale structure of the universe, we mean
A) the overall arrangement of galaxies, clusters of galaxies, and superclusters in the universe. B) the structure of any large galaxy. C) the structure of any individual cluster of galaxies. D) the overall shape of the observable universe.
A 100 g glass container contains 250 g of water at 
A 100 g piece of unknown material at 
is added to the water in the container. The final temperature of the mixture is 
What is the specific heat of the unknown material in 
(specific heat of water 
specific heat of glass
A. 245 B. 387 C. 412 D. 558 E. 674