Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 2, Problem 8P
An athlete leaves one end of a pool of length L at t = 0 and arrives at the other end at time t1. She swims back and arrives at the starting position at time t2. If she is swimming initially in the positive x direction, determine her average velocities symbolically in (a) the first half of the swim, (b) the second half of the swim, and (c) the round trip. (d) What is her average speed for the round trip?
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An athlete leaves one end of a pool of length L at t = 0 and arrives at the other end at time t,. She swims back and arrives at the starting position at time
t3. If she is swimming initially in the positive x direction, determine her average velocities symbolically in the first half of the swim, the second half of the
swim, and the round trip. (Assume that time t, is from the other end of the pool to the starting point. Use any variable or symbol stated above as
necessary. Indicate the direction with the sign of your answer.)
(a) the first half of the swim
V avg
(b) the second half of the swim
Vavg
(c) the round trip
Vavg
=
(d) What is her average speed for the round trip?
average speed =
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8. An athlete leaves one end of a pool of length Lat t- O
and arrives at the other end at time t1. She swims back
and arrives at the starting position at time t2. If she is
swimming initially in the positive x direction, deter-
mine her average velocities symbolically in (a) the first
half of the swim, (b) the second half of the swim, and
(c) the round trip. (d) What is her average speed for
the round trip?
A particle moving in 1D has time-dependent velocity which is given by the quadratic function v(t) = At2 + Bt + C, where A = 4.5 m/s3, B = 3.6 m/s2, and C = −1.7 m/s. a) Find the average acceleration of the particle between t = 0 s and 2.5 s. b) Find the average acceleration of the particle between t = 2.5 s and 5.0 s. c) At what time(s) is the particle at rest?
Chapter 2 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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