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Revision as of 12:53, 1 September 2010 (edit) Ian (Talk | contribs) (New page: Taking moments about the point A: <math>\begin{align} & 1 \textrm{.}5\times {{R}_{B}}=0 \textrm{.}5\times 20\times 9 \textrm{.}8 \\ & {{R}_{B}}=\frac{ 0\textrm{.}5\times 20\times 9 \text...) ← Previous diff		Revision as of 09:19, 8 March 2011 (edit) (undo) Ian (Talk | contribs) Next diff →
Line 1:		Line 1:
-	Taking moments about the point A:	+	Taking moments about the point <math>A</math>:
	<math>\begin{align}		<math>\begin{align}
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	\end{align}</math>		\end{align}</math>
-	Taking moments about the point A:	+	Taking moments about the point <math>B</math>:
	<math>\begin{align}		<math>\begin{align}
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	\end{align}</math>		\end{align}</math>
-	Or	+	Or use
-	<math>\begin{align}	+	<math>{{R}_{A}}+{{R}_{B}}=20\times 9\textrm{.}8\ \text{N}</math>
-	& {{R}_{A}}+65 \textrm{.}3=20\times \textrm{.}7\text{ N} \\	+
-	\end{align}</math>	+	and only one of the above moment equations.

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Revision as of 09:19, 8 March 2011

Taking moments about the point \displaystyle A:

\displaystyle \begin{align} & 1 \textrm{.}5\times {{R}_{B}}=0 \textrm{.}5\times 20\times 9 \textrm{.}8 \\ & {{R}_{B}}=\frac{ 0\textrm{.}5\times 20\times 9 \textrm{.}8}{1 \textrm{.}5}=65 \textrm{.}3\text{ N} \\ \end{align}

Taking moments about the point \displaystyle B:

\displaystyle \begin{align} & 1 \textrm{.}5\times {{R}_{A}}=1\times 20\times 9 \textrm{.}8 \\ & {{R}_{A}}=\frac{1\times 20\times 9 \textrm{.}8}{1 \textrm{.}5}=130 \textrm{.}7\text{ N} \\ \end{align}

Or use

\displaystyle {{R}_{A}}+{{R}_{B}}=20\times 9\textrm{.}8\ \text{N}

and only one of the above moment equations.