An electrical generating plant operates at a boiler temperature of 200°C and exhausts the unused heat into a nearby river at 20°C. What is the maximum theoretical efficiency of the plant? (0°C = 273 K)
a. 61%
c. 21%
b. 38%
d. 41%
B
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Indicate whether the statement is true or false
An object’s x-velocity vx (t) is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its x-position?
A. A
B. B
C. C
D. D
E. E
Which quantity can be converted from the English system to the metric system by the conversion factor 
?
A. feet per second B. feet per hour C. miles per second D. miles per hour E. miles per minute
A baseball pitcher throws a fastball at 98 mph. He also has a slower "changeup" pitch, 75 mph, which he throws identically, same windup and same release angle from shoulder height. Which pitch gets to home plate with a flatter trajectory-i.e., velocity vector closer to horizontal?
A. The fastball B. The changeup C. They each have same trajectory, since the distance to home plate is the same