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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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 Fig. P2.56). He and the sled were safely brought to rest in 1.40 s. Determine in SI units (a) the negative; acceleration he experienced and (b) the distance he traveled during this negative acceleration.

images

Figure P2.56 (left) Col. John Stapp and his rocket sled are brought to rest in a very short time interval, (right) Stapp’s face is contorted by the stress of rapid negative acceleration.

(a)

To determine
The negative acceleration experienced by the jet pilot.

Explanation

Given Info: The initial velocity of the jet pilot is 632mi/h , the final velocity of the jet pilot is 0 , and the time taken by the jet pilot to decelerate is 1.40s .

Explanation:

The formula used to calculate the negative acceleration of the jet pilot is,

a=vv0t

Here,

v is the final velocity of the jet pilot

v0 is the initial velocity of the jet pilot

a is the negative  acceleration experienced by the jet pilot

t is the time taken by the jet pilot to decelerate

Substitute 632mi/h for v0 , 0 for v and 1.40s for t to find a

(b)

To determine
The distance travelled while stopping.

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