Mathematics

Mathematics

Problem

Vector

\vec R

has magnitude

4\,\text{units}

and is directed

60^\circ

above the positive

x

-axis. Vector

\vec S

has magnitude

7\,\text{units}

and is directed

150^\circ

from the same axis. Determine the angle between

\vec R

and

\vec S

. a)

30^\circ

b)

120^\circ

c)

90^\circ

d)

60^\circ

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