84. Unreasonable Results A cyclist rides 16.0 km east, then 8.0 km west, then 8.0 km east, then 32.0 km west, and finally 11.2 km east. If his average velocity is 24 km/ h, how long did it take him to complete the trip? Is this a ils yow orb to 190 reasonable time?

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter3: Motion Along A Straight Line
Section: Chapter Questions
Problem 83AP: An airplane leaves Chicago and makes the 3000-km trip Los Angeles in 5.0 h. A second plane leaves...
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Number 84 how do you find the average velocity ? Is this reasonable time ? Explain
velocity, how long did it take a ball
reach home plate, which is 18.4 m from the pitcher'
mound? Compare this with the average reaction time of a
human to a visual stimulus, which is 0.25 s.
83. An airplane leaves Chicago and makes the 3000-km
trip to Los Angeles in 5.0 h. A second plane leaves Chicago
one-half hour later and arrives in Los Angeles at the same
time. Compare the average velocities of the two planes.
Ignore the curvature of Earth and the difference in altitude
between the two cities.
84. Unreasonable Results A cyclist rides 16.0 km east,
then 8.0 km west, then 8.0 km east, then 32.0 km west,
and finally 11.2 km east. If his average velocity is 24 km/
h, how long did it take him to complete the trip? Is this a
reasonable time?
85. An object has an acceleration of +1.2 cm/s².
At
t = 4.0 s, its velocity is -3.4 cm/s. Determine the
object's velocities at t = 1.0 s and t = 6.0 s.
86. A particle moves along the x-axis according to the
equation x(t) = 2.0-4.0t2 m. What are the velocity and
acceleration at t = 2.0 s and t = 5.0 s?
87. A particle moving at constant acceleration has
velocities of 2.0 m/s at t = 2.0 s and -7.6 m/s
t = 5.2 s. What is the acceleration of the
at
88. A train in
Dant
sa
it
ta
90
he
lis
re
tra
th
lig
W
91
2.0
(a)
the
92
Du
acc
vel
con
late
(b)
far
Transcribed Image Text:velocity, how long did it take a ball reach home plate, which is 18.4 m from the pitcher' mound? Compare this with the average reaction time of a human to a visual stimulus, which is 0.25 s. 83. An airplane leaves Chicago and makes the 3000-km trip to Los Angeles in 5.0 h. A second plane leaves Chicago one-half hour later and arrives in Los Angeles at the same time. Compare the average velocities of the two planes. Ignore the curvature of Earth and the difference in altitude between the two cities. 84. Unreasonable Results A cyclist rides 16.0 km east, then 8.0 km west, then 8.0 km east, then 32.0 km west, and finally 11.2 km east. If his average velocity is 24 km/ h, how long did it take him to complete the trip? Is this a reasonable time? 85. An object has an acceleration of +1.2 cm/s². At t = 4.0 s, its velocity is -3.4 cm/s. Determine the object's velocities at t = 1.0 s and t = 6.0 s. 86. A particle moves along the x-axis according to the equation x(t) = 2.0-4.0t2 m. What are the velocity and acceleration at t = 2.0 s and t = 5.0 s? 87. A particle moving at constant acceleration has velocities of 2.0 m/s at t = 2.0 s and -7.6 m/s t = 5.2 s. What is the acceleration of the at 88. A train in Dant sa it ta 90 he lis re tra th lig W 91 2.0 (a) the 92 Du acc vel con late (b) far
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