College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 61PP
A large number of seeds are observed, and their initial launch angles are recorded. The range of projection angles is found to be −51° to 75°, with a mean of 31°. Approximately 65% of the seeds were launched between 6° and 56°. Which of the following hypotheses is best supported by these data? Seeds are preferentially launched
- A. at angles that maximize the height they travel above the plant.
- B. at angles below the horizontal in order to drive the seeds into the ground with more force.
- C. at angles that maximize the horizontal distance traveled from the plant.
- D. at angles that minimize the time the seeds spend exposed to the air.
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Which of the following are TRUE? Choose only two (2).
Select one or more:
a. The range is inversely proportional to the sine of twice the launch angle.
b. At constant initial velocity, as the launch angle increases, range also increases.
c. The range is directly proportional to the sine of twice the launch angle.
d. At constant initial velocity, for launch angles less than 45°, range increases as launch angles increases. For angles greater than 45°, range decreases as launch angles increases.
e. At constant initial velocity, as the launch angle increases, range decreases.
Jack and Jill ran up the hill at 3.0 m/s. The horizontal component of Jill’s velocity vector was 2.5 m/s.a. What was the angle of the hill?b. What was the vertical component of Jill’s velocity?
A bird embarks on the journey of winter migration from her nest. She starts by flying 65.0 km due south. She then heads 55.0 ̊ south of east for 45.0 km. She flies the last portion of her journey heading 35.0 ̊ south of west for 83.0 km. a) How far from the nest does the bird end up at the end of her journey? Give your answer to 3 significant figures. b) In what direction is the nest, relative to the bird’s final position? Give your answer as an angle, to the nearest degree.
Chapter 3 Solutions
College Physics (10th Edition)
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