cq_1_072

#$&*

Phy 201

Your 'cq_1_07.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

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Copy the problem below into a text editor or word processor.

• This form accepts only text so a text editor such as Notepad is fine.

• You might prefer for your own reasons to use a word processor (for example the formatting features might help you organize your answer and explanations), but note that formatting will be lost when you submit your work through the form.

• If you use a word processor avoid using special characters or symbols, which would require more of your time to create and will not be represented correctly by the form.

• As you will see within the first few assignments, there is an easily-learned keyboard-based shorthand that doesn't look quite as pretty as word-processor symbols, but which gets the job done much more efficiently.

You should enter your answers using the text editor or word processor. You will then copy-and-paste it into the box below, and submit.

________________________________________

An automobile rolls 10 meters down a constant incline with slope .05 in 8 seconds, starting from rest. The same automobile requires 5 seconds to roll the same distance down an incline with slope .10, again starting from rest.

• At what average rate is the automobile's acceleration changing with respect to the slope of the incline?

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

`ds = 10 m = x

M = .05, .10

`dt = 8s, 5s

Delta a / Delta Slope

X = vt + ½ at^2

10 = at^2 / 2

20 = at^2

20 m / 64 s/^2 = a

A = 0.3 m/s^2

X = vt + 1/1 at^2

10 = at^2/2

20 = at^2

20 m / 25 s^2 = a

A = 0.8 m/s^2

0.8 m/s^2 – 0.3 m/s^2 / .10 - .05

0.5 m/s^2 / .05 slope

= 10 m/s^2 average rate of change in acceleration

#$&*

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9/22 2pm

Very good. Few students interpret that rate of change correctly.

cq_1_072

#$&*

Phy 201

Your 'cq_1_07.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

** **

Copy the problem below into a text editor or word processor.

• This form accepts only text so a text editor such as Notepad is fine.

• You might prefer for your own reasons to use a word processor (for example the formatting features might help you organize your answer and explanations), but note that formatting will be lost when you submit your work through the form.

• If you use a word processor avoid using special characters or symbols, which would require more of your time to create and will not be represented correctly by the form.

• As you will see within the first few assignments, there is an easily-learned keyboard-based shorthand that doesn't look quite as pretty as word-processor symbols, but which gets the job done much more efficiently.

You should enter your answers using the text editor or word processor. You will then copy-and-paste it into the box below, and submit.

________________________________________

An automobile rolls 10 meters down a constant incline with slope .05 in 8 seconds, starting from rest. The same automobile requires 5 seconds to roll the same distance down an incline with slope .10, again starting from rest.

• At what average rate is the automobile's acceleration changing with respect to the slope of the incline?

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

`ds = 10 m = x

M = .05, .10

`dt = 8s, 5s

Delta a / Delta Slope

X = vt + ½ at^2

10 = at^2 / 2

20 = at^2

20 m / 64 s/^2 = a

A = 0.3 m/s^2

X = vt + 1/1 at^2

10 = at^2/2

20 = at^2

20 m / 25 s^2 = a

A = 0.8 m/s^2

0.8 m/s^2 – 0.3 m/s^2 / .10 - .05

0.5 m/s^2 / .05 slope

= 10 m/s^2 average rate of change in acceleration

#$&*

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around 40 minutes

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9/22 2pm

I believe this was already posted.