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 Post subject: Vector Problem (Repost from old board)Posted: Mon, 19 May 2003 14:21:57 UTC
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Last edited by Mother Goose on Fri, 1 Oct 2004 21:01:55 UTC, edited 1 time in total.

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 Post subject: Posted: Mon, 19 May 2003 17:49:26 UTC
 Senior Member

Joined: Mon, 19 May 2003 07:20:59 UTC
Posts: 123
Location: Australia
Hi,
There is a mistake in Soroban's working.
Quote:
Hence, sec(A) = sqrt(10)/3
and sec^2(A) = 10/9

The correct working should be:
sec(A)=sqrt(10)/1
and sec^2(A)=10

Hence dx/dt = (10)(pi/3) = 10(pi)/3 km/min

Also, Mother Goose's value for A=1.24 radians is only an approximation rounded off to 2 decimal places.
In fact A=1.249045772......
If this value is substituted into
dx/dt=pi/3 * ( 1 / cos^2(A) ) , we will get
dx/dt=pi/3 * ( 1 / cos^2(1.249045772..) )
=10pi/3

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