Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 1, Problem 57GP
Jean camps beside a wide river and wonders how wide it is. She spots a large rock on the bank directly across from her. She then walks upstream until she judges that the angle between her and the rock, which she can still see clearly, is now at an angle of 30° downstream (Fig. 1–16). Jean measures her stride to be about 1 yard long. The distance back to her camp is 120 strides. About how far across, both in yards and in meters, is the river?
FIGURE 1–16
Problem 57.
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Jim stands beside a wide river and wonders how wide it
is. He spots a large rock on the bank directly across from
him. He then walks upstream
65 strides and judges that
the angle between him and
the rock, which he can still
see, is now at an angle of
30° downstream (Fig. 1–20).
Jim measures his stride
30° !
to be about 0.8 m long.
Estimate the width of the
river.
FIGURE 1-20
Problem 54.
65 Strides
Hold a pencil in front of your eye at a position where its
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FIGURE 1-19
Problem 48. How big
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Name the physical quantities related to the following units :
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Chapter 1 Solutions
Physics for Scientists and Engineers with Modern Physics
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