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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Question
Chapter 2, Problem 2.31P
(a)
To determine
The negative acceleration that he experienced.
(b)
To determine
The distance travelled during the negative acceleration.
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A thief is trying to escape from a parking garage after completing a robbery, and the thief’s car is speeding (v = 18.5 m/s) toward the door of the parking garage (Fig. P2.60). When the thief is L = 30 m from the door a police officer flips a switch to close the garage door. The door starts at a height of 5.5 m and moves downward at 0.5 m/s. If the thief’s car is 1.4 m tall, will the thief escape? (Find the height of the door above the ground).
Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h (see figure below). He and the sled were safely brought to rest in 1.40 s.
(a) Determine in SI units the negative acceleration he experienced. (m/s2)
(b) Determine in SI units the distance he traveled during this negative acceleration. (m)
Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h. He and the sled were safely brought to rest in 1.40 s.
(a) Determine the negative acceleration he experienced (in m/s2).
answer: -202m/s^2
(b) Determine the distance he traveled during this negative acceleration (in m).
answer: 198 m
(c) What If? Col. Stapp was able to walk away from this experiment. If the human body can survive a negative acceleration five times that experienced by Col. Stapp, what minimum stopping time (in s) would this correspond to in the 1954 experiment?
______________s
Chapter 2 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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