A surveyor wants to find the distance across a river. A stake is placed on each bank of the river as shown in the figure. She measures a distance of 30.0 m from one stake to another on the same side of the river, thus finding the third vertex on a right triangle. She then measures the angle O and finds it equal to 75.9°. What is the distance across the river?

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Author:Raymond A. Serway, John W. Jewett
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Chapter3: Vectors
Section: Chapter Questions
Problem 3.7P: A surveyor measures the distance across a straight river by the following method (Fig. P3.7)....
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1. A surveyor wants to find the distance across a river. A stake is placed on each bank of
the river as shown in the figure. She measures a distance of 30.0 m from one stake to
another on the same side of the river, thus finding the third vertex on a right triangle.
She then measures the angle 0 and finds it equal to 75.9°. What is the distance across
the river?
30.0 m
A) 89.2 m
B) 15.3 m
C) 119 m
D) 268 m
E) 29.0 m
Transcribed Image Text:1. A surveyor wants to find the distance across a river. A stake is placed on each bank of the river as shown in the figure. She measures a distance of 30.0 m from one stake to another on the same side of the river, thus finding the third vertex on a right triangle. She then measures the angle 0 and finds it equal to 75.9°. What is the distance across the river? 30.0 m A) 89.2 m B) 15.3 m C) 119 m D) 268 m E) 29.0 m
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