An uncontrolled 850 kg car strikes squarely a motorway crash cushion in which the car is brought to rest by successively crushing steel barrels. The length of the crash cushion is 5.9 m, and the magnitude F of the force required to crush the barrels as a function of the distance æ the car has moved into the cushion is given by 85kN (0 < x < 1.7m) 130kN (1.7 < æ < 4.4m) 170kN (4.4 < x < 5.9m)
An uncontrolled 850 kg car strikes squarely a motorway crash cushion in which the car is brought to rest by successively crushing steel barrels. The length of the crash cushion is 5.9 m, and the magnitude F of the force required to crush the barrels as a function of the distance æ the car has moved into the cushion is given by 85kN (0 < x < 1.7m) 130kN (1.7 < æ < 4.4m) 170kN (4.4 < x < 5.9m)
International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter7: Dry Friction
Section: Chapter Questions
Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)...
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can you help me with the last part please
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