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Mathematics
Mathematics
Problem
Two non-zero vectors
p
\mathbf p
p
and
q
\mathbf q
q
satisfy
p
⋅
q
=
−
∣
p
∣
∣
q
∣
\mathbf p\cdot\mathbf q = -|\mathbf p|\,|\mathbf q|
p
⋅
q
=
−
∣
p
∣
∣
q
∣
. What is the angle
θ
\theta
θ
between them? a)
90
∘
90^{\circ}
9
0
∘
b)
0
∘
0^{\circ}
0
∘
c)
180
∘
180^{\circ}
18
0
∘
d)
120
∘
120^{\circ}
12
0
∘
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