Physics II workshop_Part_54

Physics II workshop_Part_54 - Impulse and Forces on Falling...

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110 Impulse and Forces on Falling People George Benedik and Felix Villars, in Physics With Illustrative Examples From Medicine And Biology , Volume 1, Addison Wesley, 1973, report that the threshold for human survival is when the pressure on impact is less than 50 pounds/square inch. If the fall is onto a person's back of area 3.8 square feet, the threshold force for death is 27,000 pounds = 1.2 x 10 5 N. In a fall from high altitude, the change in momentum is fixed by the terminal velocity before impact, about 120 mph, and the velocity of 0 after what we hope is not "Terminal" impact. For the situations described below, find the average force and decide if the situations satisfy this criterion for survival? "During one of the battalion drops, from 1200 feet on a clear, relatively warm day, an observer noted what appeared to be an unsupported bundle falling from one of the C-119 airplanes; no chute deployed from the object. The impact looked like a mortar round exploding in the snow. When the aidmen reached the spot they found a young ... paratrooper flat on his back at the bottom of a 3 1/2 foot crater in
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