cq_1_081

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Phy 201

Your 'cq_1_08.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

** CQ_1_08.1_labelMessages **

A ball is tossed upward with an initial velocity of 25 meters / second.  Assume that the acceleration of gravity is 10 m/s^2 downward. 

What will be the velocity of the ball after one second? 

answer/question/discussion: ->->->->->->->->->->->-> :

-10 m/s^2=(vf-25 m/s)/1s

vf=(-10 m/s)+25 m/s=15 m/s

 

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What will be its velocity at the end of two seconds? 

answer/question/discussion: ->->->->->->->->->->->-> :

-10 m/s^2=(vf-25 m/s)/2 s

vf=-20 m/s+25 m/s=5 m/s

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During the first two seconds, what therefore is its average velocity? 

answer/question/discussion: ->->->->->->->->->->->-> :

 vAve=(5 m/s+25 m/s)/2=15 m/s

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How far does it therefore rise in the first two seconds?

answer/question/discussion: ->->->->->->->->->->->-> :

 ds=15 m/s*2 s=30 m

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What will be its velocity at the end of a additional second, and at the end of one more additional second? 

answer/question/discussion: ->->->->->->->->->->->-> :

 At the end of 3 seconds the velocity will be -5 m/s and at the end of 4 seconds the final velocity will be -15 m/s

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At what instant does the ball reach its maximum height, and how high has it risen by that instant? 

answer/question/discussion: ->->->->->->->->->->->-> :

When it is at its maximum height the vf is at 0 m/s.

a=(vf-v0)/dt

dt=(vf-v0)/a

dt=(-25 m/s)/-10 m/s^2

dt=2.5 s

ds=(12.5 m/s)*2.5 s=31.25 m

 

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What is its average velocity for the first four seconds, and how high is it at the end of the fourth second? 

answer/question/discussion: ->->->->->->->->->->->-> :

 vAve=(v0+vf)/2=(25 m/s+-15 m/s)/2=5 m/s

ds=(5 m/s)*4 s=20 m

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*#&!

&#Very good responses. Let me know if you have questions. &#

phy 201

Your 'orientation part iii b' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

** Orientation Part III b_labelMessages **

Task: `q000: Verify that you have your disks.

your response &&&&&&&&&&&&&&&&&&

(insert your response beginning in the next line):

Note: If you do not have the disks for your course, you cannot complete this exercise at this time. Complete this once you have your disks.

Checking disks:

Task: `q001. Class notes, in lecture format with working video links, are distributed on the disk(s) you purchased from the bookstore.

If you do not have your disks yet you will have to skip this instruction for now, and you will need to return to this exercise when you receive them. If that is the case you may close this assignment after first entering in the response area below a statement that you do not yet have the disks.

Note that the contents of each disk can be copied to a convenient device or location on your hard drive. The entire contents of a single disk will fit easily on a flash drive with capacity 8 gigaBytes or more, and require only a small fraction of the space on a typical hard drive.

The file structure of the disk has a root folder and a number of subfolders. If you browse to the contents of the folder, either on the disk or on another device to which it has been copied, you will see the file

• ph1_DVD_01.htm (Physics I Part I)

• ph1_DVD_02.htm (Physics I Part II)

• ph2_DVD_01.htm (Physics I Part I)

• ph2_DVD_02.htm (Physics I Part II)

This file will run in your Internet browser, and will give you access to the entire contents of the disk.

When you run the HTML file you get a menu with a series of links. The titles of those links are

Physics I Part I:

Disk 0

Gen1

Disk 2

Disk 3

Intro Problem Set 3

Intro Problem Sets 4, 5, 6

EPS01

Physics I Part II:

Disk 4

Disk 5

Disk 6

Disk 7

Disk 8

Disk 9

Disk EPS02

Physics II Part I:

Disk 0

Disk 1

Disk 2

Disk 3

Disk 4

EPS01

University Physics Fluids and Thermodynamics

Physics II Part II:

Experiments

Disk 5

Disk 6

Disk 7

If you click on any of these headings you will be taken to a submenu, from which you can access individual Class Notes and other documents with working video links.

Do this now and describe what you see.

your response &&&&&&&&&&&&&&&&&&

(insert your response beginning in the next line; the next line is blank and doesn't include the #$... prompt):

I inserted each disc that I received in the mail (Phy IA and Phy IB) and nothing came up on the computer.

#$&* (Note that your response was to go into 'the next line'; your response will therefore be inserted before this line, not after. This is obvious when you're looking at the form, but if you've copied the form into a text editor it might be less obvious. Hence this note.)

*#&!*#&!

@&

You might be expecting the disks to automatically play. They won't do so. You have to browse your computer to locate the specified files.

Tell me step by step what you did after you inserted a disk. If you don't know how to browse the files on your computer, let me know what operating system you are using.

*@