Two surveyors measure the distance across a river that they cannot cross. They drive two stakes into the ground and find that the distance between the stakes, the baseline, is 15 meters. They choose a pole as a landmark on the opposite side of the river. This forms a triangle, with the two stakes as two corners and the pole as the third corner. When sighting the pole from the two ends of the
baseline, the two angles formed on their side of the river are 82° and 67°. The distance from the baseline to the pole calculated using the triangulation method is approximately _____.
A) 76 meters
B) 83 meters
C) 26 meters
D) 43 meters
C
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The rate of cratering
A) has remained constant over the last 4.6 billion years. B) has recently increased with more collisions in the asteroid belt. C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud. D) shows that large asteroid impacts are more common now than in the past. E) shows that most interplanetary debris was swept up soon after the formation of the solar system.
The switch in the figure is closed at t = 0 when the current I is zero. When I = 15 mA, what is the potential difference across the inductor?
a.
240 V
b.
60 V
c.
0
d.
180 V
e.
190 V
The figure shows the graph of 
versus time for an object moving along the x-axis. Solve graphically for the distance traveled between t = 5.0 s and t = 9.0 s.
A. 110 m
B. 120 m
C. 100 m
D. 130 m
At room temperature, the coefficient of linear expansion for Pyrex glass is ____ that for ordinary glass
a. the same as b. more than c. less than d. stronger than