Help angles and mechanics

Help!
You know to work out the angle I did tan-1(-10/1)
To get -84.3 but here it’s positive…
And it says below the x axis.
If I put minus 84.3 in an exam would I get the mark??

(edited 11 months ago)

Reply 1

mqb2766

21

By saying below the x-axis or clockwise from the x-axis its equivalent to saying its negative where the usual convention is +ive anticlockwise from the x-axis. You should get the mark, though there may be something specific in the question which would clarify how they wanted the answer.

Im sure you know to be careful with using atan() if the "i" component is negative, as atan() has a range -90..90.

(edited 11 months ago)

Reply 2

Alevelhelp.1

OP

15

Original post by mqb2766

By saying below the x-axis or clockwise from the x-axis its equivalent to saying its negative where the usual convention is +ive anticlockwise from the x-axis. You should get the mark, though there may be something specific in the question which would clarify how they wanted the answer.

Im sure you know to be careful with using atan() if the "i" component is negative, as atan() has a range -90..90.

Thank you so much for helping me on multiple qs, it really means a lot… btw if I can help you with anything you can ask though you can probably tell how useless I am 😭.
btw what do u study? 📚 or have studied?

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