will give medal for right answer, this is all the information i was given and i am running out of time!!!!!!! For the vector W = 12, –20, determine |W| and the angle between W and the x-axis.

Question

will give medal for right answer, this is all the information i was given and i am running out of time!!!!!!!    For the vector W = 12, –20, determine |W| and the angle between W and the x-axis.

caozeyuan · Answer

length of (x,y) is sqrt(x^2+y^2)

caozeyuan · Answer

angel is arctan(y/x)

anonymous · Answer

so the angle between w and the x axis is arctan(y/x)?

caozeyuan · Answer

yes, but if any of x and y is negative, you need be careful to check the output of your calculator by graph the vector on the coordinate plane

anonymous · Answer

oh thank you, I have been trying for days to figure this out