- #1

GreenLantern

- 30

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So I am currently a second semester Mechanical Engineering student and have been getting A's on every test in every class this semester...until now. I took my third to last physics test on friday and received it back on monday with a 76%. As i started to look through the test I saw that I lost 12 points (total from two separate problems) because of one simple thing.

On two questions he asks for a vectors magnitude and direction. Now the way I've always considered this was it could be answered in two forms. A resultant vector magnitude and a direction given in terms of an angle or unit vector OR it could be given in terms of vector components. At least this has been gravy for my calc/engineering classes...

What do you all think?

is:

**[tex]\vec{F}[/tex]**=[5[tex]\hat{j}[/tex] + 3[tex]\hat{k}[/tex]]

considered magnitude and direction of a vector?

heres one of the actual problems (at the beginning of the test he specifically mentioned vector as the answer for it)

sorry its so massive...but am I really wrong in this? I got the correct components but is this really considered as not an accurate answer for the magnitude and direction of the magnetic field warranting a loss of 7/20 points? And should I even care enough to try and get it changed because this is the third out of three tests with which the one with the lowest grade gets dropped (this test score wouldn't count no matter wether i received the 12 points or not)

thanks everyone (hope this is the right forum)

-GreenLantern