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Question Number 55913 by peter frank last updated on 06/Mar/19

	Answered by tanmay.chaudhury50@gmail.com last updated on 06/Mar/19

	$O \vec{A} = - 2 i + 2 j + 3 k$ $O \vec{B} = 2 i - 3 j + k$ $O \vec{C} = 4 i + 5 j + 3 k$ $B \vec{C} = O \vec{C} - O \vec{B} = 2 i + 8 j + 2 k$ $i n q u e s t i o n n o v a l u e o f f o r c e a l s o d i r e c t i o n$ $n o t g i v e n . a s s u m i n g m a g n e t u d e o f f o r c e$ $F a n d d i r e c t i o n O \vec{A}$ $m i d p o i n t o f B a n d C i s D (3, 1, 2)$ $O \vec{D} = 3 i + j + 2 k$ $B \vec{D} = O \vec{D} - O \vec{B}$ $B \vec{D} = i + 4 j + k$ $D \vec{C} = O \vec{C} - O \vec{D}$ $D \vec{C} = i + 4 j + k$ $w o r k d o n e$ $B \to D t h e n D \to C$ $F (- 2 i + 2 j + 3 k) . (i + 4 j + k) + \frac{F}{2} (- 2 i + 2 j + 3 k) . (i + 4 j + k)$ $\frac{3 F}{2} (- 2 + 8 + 3)$ $\frac{27 F}{2}$
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