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Vectors help watch

1. Hate vectors so much. This is the forst exercise in my book and I can't seem to do it. There aren't any examples on how to do it either:

The vector P has magnitude 10 units and is inclined at 150degrees to the x-axis. Express P as a column vector.

Any help is appreciated as I am lost, thanks.
2. (Original post by mnaj123)
Hate vectors so much. This is the forst exercise in my book and I can't seem to do it. There aren't any examples on how to do it either:

The vector P has magnitude 10 units and is inclined at 150degrees to the x-axis. Express P as a column vector.

Any help is appreciated as I am lost, thanks.
Draw a triangle with one vertex at the origin, a hypotenuse with length ten and the angle 30 degrees marked in between the negative x-axis and the hypotenuse. Then calculate the height and that's your component. The length of the adjacent or base will be your component but you will need to tack on a minus sign for obvious reasons.
3. (Original post by Zacken)
Draw a triangle with one vertex at the origin, a hypotenuse with length ten and the angle 30 degrees marked in between the negative x-axis and the hypotenuse. Then calculate the height and that's your component. The length of the adjacent or base will be your component but you will need to tack on a minus sign for obvious reasons.
Ahhhh thanks so much! Got it..
But, how do I know when to use the angle given or 180-given angle?
Because most of these question require you to use the given angle rather than 180-it.

Thanks for your help.
4. (Original post by mnaj123)
Ahhhh thanks so much! Got it..
But, how do I know when to use the angle given or 180-given angle?
Because most of these question require you to use the given angle rather than 180-it.

Thanks for your help.
Not a problem, glad that helped - uhm, basically just sketch the triangle and see what angle makes life the easiest. :-)
5. (Original post by Zacken)
Not a problem, glad that helped - uhm, basically just sketch the triangle and see what angle makes life the easiest. :-)
Aha, alright thank you so much

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