Question

2)At the time of interest, the solar rays are parallel to vector 2i - j - 2k . Find the angle (the acute angle) between the rays and the planar (assumed planar locally) surface of earth. Please help

Answer 1

Anyone know vectors

Answer 2

vectors? yes; this question? no

Answer 3

hahahaha

Answer 4

why

Answer 5

it appears to be a 2nd part of somehting bigger that has more information for us that you have not presented

Answer 6

2) has no relevance other than stating this as a second part, or a second question. And since the information in this is a bit vague, id assume the 1) has relevant information

Answer 7

ok i will put it later and may be try to draw the figure

Answer 8

that would help; finding the angle is simple enough, but i got no idea how to interpret the information given :)

Answer 9

send me ur email add i can forward those questions that are making me loose my mind at the moment, because unless i know them i may not graduate.

Answer 10

funny enough that one is jus as it is. man i need help big time

Answer 11

our vector in the plane is H<1,2,0>

our vector from the plane is V<-2,1,2>

magnitude of each we need

Answer 12

|H| = sqrt(1+4+0) = sqrt(5)

|V| = sqrt(4+1+4) = sqrt(9) = 3

Answer 13

\[cos(t)=\frac{H.V}{|H||V|}\]
\[t=cos^{-1}\frac{H.V}{|H||V|}\]

Answer 14

let me email the doc to u please

Answer 15

1 2 0
-2 1 2
-------
-2+2+2 = 2 ; H.V

\[t=cos^{-1}\frac{2}{3 \sqrt{5}}\]

i dont do emails ...

Answer 16

attach it as a file in here

Answer 17

ok, i appriciate u doing this one though, i try to understand it

Answer 18

http://www.wolframalpha.com/input/?i=arccos%282%2F%283sqrt%285%29%29%29

Answer 19

let be dbl chk my thoughts

Answer 20

ok