Homework 5, due September 29, 2011.

Due at noon on Thursday, September 29, 2011.
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goodwine
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Homework 5, due September 29, 2011.

Post by goodwine »

Reading: You should have read everything from Chapter 1 through Chapter 4 by now. The first exam will cover this material.

Exercises: 4.3, 4.4, 4.7, 4.9, 4.10, 4.12, 4.14, 4.19 and 4.22.
Bill Goodwine, 376 Fitzpatrick
pat

Re: Homework 5, due September 29, 2011.

Post by pat »

Can you give a suggestion on how to solve Problem 4.14? I do not know where to start.
pat

Re: Homework 5, due September 29, 2011.

Post by pat »

Also, I'm confused as to how to solve for the homogeneous solutions in Problem 4.22 because it involves x and y terms. How should we do this?
goodwine
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Re: Homework 5, due September 29, 2011.

Post by goodwine »

pat wrote:Can you give a suggestion on how to solve Problem 4.14? I do not know where to start.
Write F=ma for the board. The forces on the board are at two points due to friction by each roller. If the board moves the normal force supported by each of the rollers changes.

I actually had this on the final exam one year.
Bill Goodwine, 376 Fitzpatrick
goodwine
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Re: Homework 5, due September 29, 2011.

Post by goodwine »

pat wrote:Also, I'm confused as to how to solve for the homogeneous solutions in Problem 4.22 because it involves x and y terms. How should we do this?
I emailed the whole class about this one.
Bill Goodwine, 376 Fitzpatrick
jszczudl

Re: Homework 5, due September 29, 2011.

Post by jszczudl »

On 4.12 are we supposed to account for the gravitational force?
astumpf

Re: Homework 5, due September 29, 2011.

Post by astumpf »

What are you looking for when you say to get approximations to steady-state solutions for equations by looking at graphs like in 4.4 or 4.7? There's nothing remotely similar to that problem in the book or what we did in class. thanks.
goodwine
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Re: Homework 5, due September 29, 2011.

Post by goodwine »

astumpf wrote:What are you looking for when you say to get approximations to steady-state solutions for equations by looking at graphs like in 4.4 or 4.7? There's nothing remotely similar to that problem in the book or what we did in class. thanks.
The graphs present all the information you need for the steady-state solution. The "approximation" partly only means that you can only approximately read the values from the graphs. Just ask yourself what those graphs are showing.
Bill Goodwine, 376 Fitzpatrick
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Re: Homework 5, due September 29, 2011.

Post by goodwine »

Someone asked me:
For homework question 4.9, it asks to find the equation for motion for figure 4.25. When doing this, do we take into account the forcing function and the gravity separately or do we assume that the forcing function in the figure is the force of gravity? Thanks!
Gravity and the forcing function are supposed to be separate.
Bill Goodwine, 376 Fitzpatrick
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