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Physics
Physics
Problem
A force
F
=
2
i
^
+
j
^
−
k
^
\mathbf{F} = 2\hat{i} + \hat{j} - \hat{k}
F
=
2
i
^
+
j
^
−
k
^
acts at a point
A
A
A
, whose position vector is
2
i
^
−
j
^
2\hat{i} - \hat{j}
2
i
^
−
j
^
. The moment of
F
\mathbf{F}
F
about the origin is a.
i
^
+
2
j
^
−
4
k
^
\hat{i} + 2\hat{j} - 4\hat{k}
i
^
+
2
j
^
−
4
k
^
b.
i
^
−
2
j
^
−
4
k
^
\hat{i} - 2\hat{j} - 4\hat{k}
i
^
−
2
j
^
−
4
k
^
c.
i
^
+
2
j
^
+
4
k
^
\hat{i} + 2\hat{j} + 4\hat{k}
i
^
+
2
j
^
+
4
k
^
d.
i
^
−
2
j
^
+
4
k
^
\hat{i} - 2\hat{j} + 4\hat{k}
i
^
−
2
j
^
+
4
k
^
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