Solution 19.8c - Revision history

Ian at 17:09, 11 October 2010

2010-10-11T17:09:45Z

←Older revision		Revision as of 17:09, 11 October 2010
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-	The expression for the velocity <math>\mathbf{v}</math> has been obtained in part b).	+	The expression for the velocity <math>\mathbf{v}</math> has been obtained in part a).

	<math>\mathbf{v}=\left( 40 \right)\mathbf{i}+\left( -2t \right)\mathbf{j}</math>		<math>\mathbf{v}=\left( 40 \right)\mathbf{i}+\left( -2t \right)\mathbf{j}</math>

2010-10-11T17:06:01Z

←Older revision		Revision as of 17:06, 11 October 2010
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-	The expression for the ~~position vector~~ <math>\mathbf{r}</math> has been obtained in part b),	+	The expression for the velocity <math>\mathbf{v}</math> has been obtained in part b).
		+
		+	<math>\mathbf{v}=\left( 40 \right)\mathbf{i}+\left( -2t \right)\mathbf{j}</math>
		+
		+	If the aeroplane is travelling south this is in the negative <math>\mathbf{j}</math> direction.
		+
		+	If the aeroplane is travelling east this is in the positive <math>\mathbf{i}</math> direction.
		+
		+	Thus if the aeroplane is travelling south east the <math>\mathbf{i}</math> component of the velocity must equal the minus <math>\mathbf{j}</math> component of the velocity.
		+
		+	<math>\begin{align}
		+	& 40=-(-2t) \\
		+	& \\
		+	& t=20\text{ s} \\
		+	\end{align}</math>

2010-10-11T16:55:13Z

←Older revision		Revision as of 16:55, 11 October 2010
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-	The expression for the position vector<math>\mathbf{r}</math> has been obtained in part b),	+	The expression for the position vector <math>\mathbf{r}</math> has been obtained in part b),

2010-10-11T16:54:55Z

New page: The expression for the position vector<math>\mathbf{r}</math> has been obtained in part b),

New page

The expression for the position vector<math>\mathbf{r}</math> has been obtained in part b),