Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN: 9781305116399
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 2, Problem 2.8P
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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Now let’s apply our definition of average velocity to a swimming competition. During one heat of a swim meet, a swimmer performs the crawl stroke in a pool 50.0 mm long, as shown in (Figure 1). She swims a length at racing speed, taking 24.0 ss to cover the length of the pool. She then takes twice that time to swim casually back to her starting point. Find (a) her average velocity for each length and (b) her average velocity for the entire swim.
c) If the swimmer could cross a 15 kmkm channel maintaining the same average velocity as for the first 50 mm in the pool, how long would it take?
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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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, Technology Update (No access codes included)
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