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Chapter 11: Q. 8 (page 286)

Automobiles are designed with 鈥渃rumple zones鈥� intended to collapse in a collision. Use the ideas of this chapter to explain why.

Short Answer

Expert verified

The crumple zones increases the time of the contact between the outer object and the passenger's zone, so less force is exerted.

Step by step solution

01

Given Information 

We need to find why Automobiles are designed with 鈥渃rumple zones鈥� intended to collapse in a collision .

02

Explanation

When an object receives a force for a short time, this force with time is called the impulse,

in force-versus time graph the momentum is same.

Hence, impulse is given by

impulse=jx=Fx鈻�t(1)

Where jxis impulse.

After solving the equation

Fx=jx鈻�t=鈻�p鈻�t(2)

Force is inversely proportional to time鈻�t . less force is excerted when, the crumple zone increases the time of the contact between the passenger's zone and the colliding object.

the time of contact to the passenger zone decreases in the absence of crumple zone. so force increases and harm the passengers zone.

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Most popular questions from this chapter

Two 500gblocks of wood are 2.0m apart on a frictionless table. A 10g bullet is fired at 400m/s toward the blocks. It passes all the way through the first block, then embeds itself in the second block. The speed of the first block immediately afterward is 6.0m/s. What is the speed of the second block after the bullet stops in it?

(600g)(4.0m/s)=(400g)(3.0m/s)+(200g)vix2

a. Write a realistic problem for which this is the correct equation(s).

b. Finish the solution of the problem, including a pictorial representation.

a. To understand why rockets often have multiple stages, first consider a single-stage rocket with an empty mass of 200 kg, 800 kg of fuel, and a 2000 m/s exhaust speed. If fired in deep space, what is the rocket鈥檚 maximum speed?

b. Now divide the rocket into two stages, each with an empty mass of 100 kg, 400 kg of fuel, and a 2000 m/s exhaust speed. The first stage is released after it runs out of fuel. What is the top speed of the second stage? You鈥檒l need to consider how the equation for vmax should be altered when a rocket is not starting from rest.

A 100 g ball moving to the right at 4.0 m/s catches up and collides with a 400 g ball that is moving to the right at 1.0 m/s. If the collision is perfectly elastic, what are the speed and direction of each ball after the collision?

What impulse does the force shown in FIGURE EX11.3 exert on a 250gparticle?
See all solutions

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