Questions
The radius vector of a point is r = (i - 2 j +3 k) m and a force F = (4 i + 5j) acts at that point. The moment of the force in Nm is
a
-15i+12j+13k
b
15i-12j+13k
c
-15i-12j+13k
d
15i+12j+13k
detailed solution
Correct option is A
The moment of the force is given by τ→=r×F=(i−2j+3k)×(4i+jj)=ijk1−2+3450=i(0−15)+j(12−0)+k(5+8)=−15i+12j+13kTalk to our academic expert!
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