# Need help with this vector problem.

Started by Aj37, Oct 05 2001 11:30 AM

8 replies to this topic

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#1
Members - Reputation: **122**

Posted 05 October 2001 - 11:30 AM

An air traffic controller notices two aircraft on his radar screen
(x-y plane). The first is at altitude 800 m, horizontal distance
19.2 km, and at 25° south of west. The second aircraft is at altitude
(z coordinate) 1100 m, horizontal distance 17.6 km, and 20° south of
west. What is the distance between the two aircraft?
(Place the x axis west, the y axis south, and the z axis vertical).
The correct answer is 2285 and I am using the distance formula
but I am missing something because I keep getting 8708.
I am using this formula d=squareroot((x1-x2)^2+(y1-y2)^2+(z1-z2)^2)
z1 = 800
z2 = 100
x1 = 19200sin(25) = 8114
x2 = 17600cos(20) = 16538
y1 = 19200sin(25) = 8114
y2 = 17600sin(20) = 6019

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#4
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Posted 05 October 2001 - 11:53 AM

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#6
Anonymous Poster_Anonymous Poster_*
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Posted 05 October 2001 - 11:34 PM

Check the API for the cos and sin functions and make sure they take degrees and not radians. Otherwise you''ll have to multiply the degree angles by PI/180 before calculating the sin and cos values. I think.

Good luck.

Good luck.

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#8
Members - Reputation: **122**

Posted 06 October 2001 - 11:08 AM

First you need to use your magnatude of components equations

x1 = C * cos(angle)

y1 = C * sin(angle)

so....

x1 = 19200 * cos(25) = 17401

y2 = 19200 * sin(25) = 8114

z1 = 800m <----- leave that as 800 meters

x2 = 17600 * cos(20) = 16538

y2 = 17600 * sin(20) = 6019

z2 = 1100m

Next you need to do is subtract your vectors

simply put.... x2 - x1 = xT = -863

y2 - y1 = yT = -2095

z2 - z1 = zT = 300

Then you would use your distance equation:

D=SqrRoot(xT^2 + yT^2 + zT^2)

D=2285

Hope that helps

-Ian

x1 = C * cos(angle)

y1 = C * sin(angle)

so....

x1 = 19200 * cos(25) = 17401

y2 = 19200 * sin(25) = 8114

z1 = 800m <----- leave that as 800 meters

x2 = 17600 * cos(20) = 16538

y2 = 17600 * sin(20) = 6019

z2 = 1100m

Next you need to do is subtract your vectors

simply put.... x2 - x1 = xT = -863

y2 - y1 = yT = -2095

z2 - z1 = zT = 300

Then you would use your distance equation:

D=SqrRoot(xT^2 + yT^2 + zT^2)

D=2285

Hope that helps

-Ian

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#9
Members - Reputation: **1373**

Posted 09 October 2001 - 02:54 AM

I''m closing this thread and several others because the question appears to be a school homework assignment from a math class. The purpose of homework is to teach students to build their comprehension of a subject and their problem-solving skills, possibly with the assistance of other students in the same class or teachers of the class. Especially for math problems such as the one posed here, it is absolutely NOT appropriate to seek the answers from folks outside one''s class or school.

These forums are to be used for assistance in game development activities only.

Graham Rhodes

Senior Scientist

Applied Research Associates, Inc.

These forums are to be used for assistance in game development activities only.

Graham Rhodes

Senior Scientist

Applied Research Associates, Inc.