Chapter 9: Problem 6
Why are cars designed so that their front ends crumple during an accident?
Chapter 9: Problem 6
Why are cars designed so that their front ends crumple during an accident?
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Get started for freeDuring a crash test, a car moving at \(50 \mathrm{km} / \mathrm{h}\) collides with a rigid barrier and comes to a complete stop in 200 ms. The collision force as a function of time is given by \(F=a t^{4}+b t^{3}+c t^{2}+d t\) where \(\quad a=-8.86 \mathrm{GN} / \mathrm{s}^{4}, b=3.27 \mathrm{GN} / \mathrm{s}^{3}, c=-362 \mathrm{MN} / \mathrm{s}^{2}\) and \(d=12.5 \mathrm{MN} / \mathrm{s}\). Find (a) the total impulse imparted by the collision, (b) the average collisional force, and (c) the car's mass.
Compared with the time between bounces, the duration of each collision is a. a tiny fraction of the time between bounces. b. a significant fraction of the time between bounces. c. much longer than the time between bounces.
On an icy road, a \(1200-\mathrm{kg}\) car moving at \(50 \mathrm{km} / \mathrm{h}\) strikes a \(4400-\mathrm{kg}\) truck moving in the same direction at \(35 \mathrm{km} / \mathrm{h}\). The pair is soon hit from behind by a \(1500-\mathrm{kg}\) car speeding at \(65 \mathrm{km} / \mathrm{h},\) and all three vehicles stick together. Find the speed of the wreckage.
You're with 19 other people on a boat at rest in frictionless water. The group's total mass is \(1500 \mathrm{kg}\), and the boat's mass is \(12,000 \mathrm{kg} .\) The entire party walks the \(6.5-\mathrm{m}\) distance from bow to stern. How far does the boat move?
The momentum of a system of pool balls is the same before and after they are hit by the cue ball. Is it still the same after one of the balls strikes the edge of the table? Explain.
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