Question

Determine u*v if ||u||=5, ||v||=4, and theta=pi/3, where theta is the angle between u and v.

Answer 1

<u,v>=||u||.||v||.cos(theta)

Answer 2

u*v = lullvlcospi/3 = 5.4.1/2 =10

Answer 3

my choices are:
14.14
13.66
10.00
12.07
17.32

Answer 4

so <u,v>=5.4.cos(pi/3)

Answer 5

10

Answer 6

when i plugged in 5.4cos(pi/3), i got 5.399

Answer 7

remember to convert to radian mode

Answer 8

you put your calc in radian mode?

Answer 9

well now i got 2.7

Answer 10

and it's not 5.4 it's 5*4

Answer 11

ohhhh

Answer 12

yeah dots and multiplication are confused a lot

Answer 13

i got 10 now, thanks for the help!

Answer 14

sure thing