#$&*
phy 121
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Hey Professor,
Thanks for not dropping me when you cleaned house this week. I realize I am a little bit behind, but for the next 7 days I am staying at a friend's place who has high-speed internet access and few distractions, so I plan on getting a lot done. Thanks for giving me a chance!
@& Very good. I'll look forward to seeing more of your work.*@
@& Thanks for the note.*@
#$&*
phy 121
Your 'question form' 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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I am looking at problem set 5 and trying to solve the problems. I understand how to arrive at the answers, but I am having a hard time following the numerical solutions. For example, in Problem Set 5 Question 1, you say that 7cos (72 deg)= 2.16, but both my calculator and google say that 7cos (72 deg)= -6.77, and I'm not sure where the discrepancy is. I'm sure this is a simple issue, but I have spent a lot of time trying to figure out the issue and don't know what else to try.
@& 7 cos(72) might be -6.77 (I just checked and it is so), but 7 cos(72 degrees) is positive.
The default unit of angle is the radian, not the degree. You'll get some idea why just a little later in the course.
7 cos(72 degrees) is indeed 2.16.
On your calculator you would need to change to degree mode rather than the default radian mode.
I'm not sure what Google utility you are using, but their documentation will certainly address radian mode vs. degree mode.*@