Question

If the vector A and B are of magnitude 4 and 3 cm making of 30 and 90 degree respectively with x axis,their scalr product will be
A)0 cm^2 b)18cm^2 c)6cm^2 d) 21 cm^2

Answer 1

scalar product = dot product=A•B cos theta
theta = 30-90=-60
cos -60=•5
so ABCos theta =3×4ו5=6cm^2
so ans is c )6cm^2

Answer 2

Answer:

I hope it may be helpful for you.