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. col. john stapp and his rocket sled are brought to rest in a very short time interval. stapp's face is contorted by the stress of rapid negative acceleration. (courtesy of u.s. air force) (a) determine the negative acceleration he experienced (in m/s2). m/s2 (b) determine the distance he traveled during this negative acceleration (in m). 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?
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Ответ:
(a)![-201.8 m/s^2](/tpl/images/0246/8882/d4959.png)
First of all, let's convert the initial velocity from miles/hour to m/s:
Then we can find the acceleration by using the equation:
where:
v = 0 is the final velocity
u = 282.5 m/s is the initial velocity
t = 1.40 s is the time interval
Substituting into the equation,
(b) 197.7 m
We can find the stopping distance by using the SUVAT equation:
where
v = 0 is the final velocity
u = 282.5 m/s is the initial velocity
d is the distance travelled while stopping
Solving for d, we find
(c) 0.28 s
In this case, the acceleration is five time that experienced in the previous experiment:
We can find the stopping time by using the equation:
where
v = 0 is the final velocity
u = 282.5 m/s is the initial velocity
Since we have the acceleration, we can re-arrange the formula to find the time:
Ответ:
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