Compared with a motor, a generator is
A) one and the same.
B) its opposite.
C) of an entirely different design.
Answer: B
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Each of two vectors, 
and 
, lies along a coordinate axis in the xy plane. Each vector has its tail at the origin, and the dot product of the two vectors is 
data-wiris-created="true" class="Wirisformula" />. Which possibility is correct? A.
and both lie along the positive x axis.B.
lies along the positive x axis. lies along the negative x axis.C.
and both lie along the positive y axis.D.
lies along the negative x axis. lies along the negative y axis.E.
lies along the positive y axis. lies along the negative x axis.Refer to the figure above. What can you conclude from the data shown on this graph alone?
A) The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years. B) Human activity has caused the carbon dioxide concentration to rise and fall many times in the past 800,000 years. C) Changes in the carbon dioxide concentration are the causes of ice ages. D) If current trends continue, carbon dioxide will soon be the most abundant gas in Earth's atmosphere.
When 0.50 kg of ice freezes, the change in entropy is
A) zero. B) 365 J/K. C) 610 J/K. D) -610 J/K. E) none of the above
Total Internal Reflection: During the investigation of a new type of optical fiber having an index of refraction n = 1.21, a laser beam is aimed at the flat end of a straight fiber, as shown in the figure. What is the maximum angle of incidence ?1 if the beam is not to escape from the sides of the fiber if it is surrounded by air?
A. 42.9° B. 39.8° C. 36.7° D. 33.6° E. 30.5°