Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

(II) Spiderman uses his spider webs to save a runaway train, Fig. $27 .$ His web stretches a few city blocks before the $10 ^ { 4 } - \mathrm { kg }$ train comes to a stop. Assuming the web acts like a spring estimate the spring constant.

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

$6 \mathrm{N} / \mathrm{m}$

Physics 101 Mechanics

Chapter 7

Work and Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

University of Michigan - Ann Arbor

Hope College

University of Sheffield

McMaster University

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

03:47

In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

03:35

Spiderman uses his spider …

01:52

02:14

03:12

05:42

01:39

01:22

Spider-man uses his spider…

04:08

$A 5.00 \times 10^{5}-\mat…

01:38

A $5.00 \times 10^{5}-kg$ …

01:00

A $5.00 \times 10^{5}$ -kg…

02:36

In a railroad switchyard, …

02:32

Web Spiders and Oscillatio…

01:41

A small fly of mass 0.22 g…

01:20

A spider can tell when its…

02:45

(II) A small fly of mass 0…

02:28

02:26

A spider's web can un…

05:41

Figure 12-30 represents an…

01:15

A 1.4 -g spider dangles fr…

04:39

Figure $12-61$ represents …

so the work needed to stop the train would be equal to the change in kinetic energy of the train. So this would be equal to 1/2 times M times V final squared minus V initial squared. We know that the final squared is going to be equal to zero, which means that the work needed to stop train would simply be equal to negative 1/2 times the mass of the train. So in this case, 10 to the fourth kilograms and then times the initial speed of the train, 20 meters per second quantity squared, and we find that the work needed to stop is going to be equal to negative two times 10 to the sixth. Jules. Now, the work due to the Web is going to be equal to the work of a spring. So this would be simply equal to negative 1/2. Okay, x squared, and this is going to be equal to the work needed to stop. So negative, too. Times 10 to the six jewels. And so when we saw for K, K will simply be equal to two times 2.0 times 10 to the sixth jewels and then this will be divided by stopping distance of 800 meters quantity squared and this is giving us six noon per meters, so the spring constant of Spider Man's webs is relatively low. However, this allows it to stretch more on, bring it to a slop slowly because if if let's just say that his web had a higher spring constant, that means that it would stop very abruptly and the passengers inside the train may I get hurt. So it is quite beneficial for his webs to have a low a spring constant that it's the end of the solution. Thank you for washing.

View More Answers From This Book

Find Another Textbook

02:02

A toroidal inductor consists of 500 turns around a toroid of radius of 10cm,…

05:54

The drawing shows two situations in which charges are placed on the x and y …

02:11

Intro to Cosmology

03:42

Three ropes A, B AND C are tied together in one single knot K. (See figure.)…

03:16

04:25

An ice cube of volume 50cm3is initially at the temperature <…

05:31

A typical helicopter with four blades rotates at 310 rpm and has a kinetic e…

03:58

A spacecraft is in a circular orbit around Earth with a radius of 10,000 km.…

01:30

A car is initially moving at 50 km/h along a straight highway. To pass anoth…

03:26

A 70-kg pole vaulter wishes to vault to a height of 6 meters. (a) Calculate …