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April 19, 2024, 05:37:59 pm
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Author Topic: HELP! VECTORS  (Read 3761 times)  Share 

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hard

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HELP! VECTORS
« on: July 07, 2008, 08:12:50 pm »
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can anyone please help me with these!

okay these are the questions.

Q1. if -->  = 60mN   ,  --> = 20 mS   
         A                     B
a)       -->    -->     
           A  +  B



Q2.
 -->                      -->
  A   = 60 km-1 NE   ,  B  = 60 km-1  SE
  Find -->   -->
         A   +  B

Q2.
-->                      -->
 A   = 40 km W   ,    B  = 40 km SW

a) find the south component of -->
                                            B

b) find the west component of -->
                                          B
c) find -->    -->
           A  +  B




THANKYOU
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hard

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Re: HELP! VECTORS
« Reply #1 on: July 07, 2008, 09:14:21 pm »
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SO NO ONE AT ALL CAN HELP!
THEN WHAT'S THE POINT OF THIS FORUM!!!!!!!
PLEASE HELP PEOPLE
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Mao

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Re: HELP! VECTORS
« Reply #2 on: July 07, 2008, 09:25:57 pm »
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Quote from: hard on July 07, 2008, 09:14:21 pm
SO NO ONE AT ALL CAN HELP!
THEN WHAT'S THE POINT OF THIS FORUM!!!!!!!
PLEASE HELP PEOPLE

it was an hour ago, dude. i think you should give people a chance to notice its up here at all.

and you can do a much better job at formatting than that. I cannot understand it.
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Collin Li

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Re: HELP! VECTORS
« Reply #3 on: July 07, 2008, 09:26:09 pm »
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Manners, or else no one will help you.
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Ken

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Re: HELP! VECTORS
« Reply #4 on: July 07, 2008, 09:41:42 pm »
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i think the arrows on top of the letters are just the vector symbols?
« Last Edit: July 07, 2008, 09:50:11 pm by Ken »
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Mao

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Re: HELP! VECTORS
« Reply #5 on: July 07, 2008, 09:49:05 pm »
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i don't think NE and SE point in the same direction :P
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cara.mel

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Re: HELP! VECTORS
« Reply #6 on: July 07, 2008, 09:59:21 pm »
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1. Draw them out as triangles
2. Use whatever you feel like (pythag if possible, cosine rule, breaking each vector into horizontal and vertical components etc) to get magnitude
3. Use trig to get direction
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ganges

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Re: HELP! VECTORS
« Reply #7 on: July 07, 2008, 10:41:29 pm »
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Also the (head) of a an arrow always touches the (tail) of an arrow when connecting these vectors.

go on itute.com for more help.......
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2008

Chem
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2007

history revolutions

2006

yr 10

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yr 8..........


1999 -grade 4

COmpleted grade 5 arithmetic......

hard

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Re: HELP! VECTORS
« Reply #8 on: July 07, 2008, 11:09:09 pm »
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very sorry for the language but i was really in a hurry.
thankyou for the replies but i'm not sure how else to lay it out.
But the arrows on top are the vector symbols.
Also NE stands for North East and SE or SW stands for south east or south west.
These are the questions. If they don't work out then please tell me.
 thank you all, appreciate every thing thanks.
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bturville

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Re: HELP! VECTORS
« Reply #9 on: July 08, 2008, 12:06:44 am »
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Quote from: caramel on July 07, 2008, 09:59:21 pm
1. Draw them out as triangles
2. Use whatever you feel like (pythag if possible, cosine rule, breaking each vector into horizontal and vertical components etc) to get magnitude
3. Use trig to get direction
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Mao

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Re: HELP! VECTORS
« Reply #10 on: July 08, 2008, 09:12:11 am »
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Quote from: hard on July 07, 2008, 11:09:09 pm
very sorry for the language but i was really in a hurry.
thankyou for the replies but i'm not sure how else to lay it out.
But the arrows on top are the vector symbols.
Also NE stands for North East and SE or SW stands for south east or south west.
These are the questions. If they don't work out then please tell me.
 thank you all, appreciate every thing thanks.

it does not appear you have attempted these. from what it sounds like, it's more like holiday homework for U1/2 you cbf doing...
maybe we can point you in the right direction if you show us where you got up to and where you are stuck on.
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hard

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Re: HELP! VECTORS
« Reply #11 on: July 08, 2008, 04:02:09 pm »
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well honestly this is like a fraction of the entire thing. I've done the rest, its just these ones im stuck on. The reason i'm stuck on the first to is because of the fact that when you draw the arrows, the are parallel to each other and cannot form a triangle, to my knowledge.
Can you show me how you do it, at least just one out of the question.
thanks
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cara.mel

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Re: HELP! VECTORS
« Reply #12 on: July 08, 2008, 04:29:42 pm »
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These are the pictures you get when you draw them out, adding tip to tail. Try to work it out from there :)

Edit: in Q3 I got the blue/purple colours around the wrong way but I can't be bothered changing it :P
« Last Edit: July 08, 2008, 04:34:49 pm by caramel »
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/0

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Re: HELP! VECTORS
« Reply #13 on: July 08, 2008, 04:35:53 pm »
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Quote from: hard on July 07, 2008, 08:12:50 pm
can anyone please help me with these!

okay these are the questions.

Q1. if -->  = 60mN   ,  --> = 20 mS  
         A                     B
a)       -->    -->    
           A  +  B



Q2.
 -->                      -->
  A   = 60 km-1 NE   ,  B  = 60 km-1  SE
  Find -->   -->
         A   +  B

Q2.
-->                      -->
 A   = 40 km W   ,    B  = 40 km SW

a) find the south component of -->
                                            B

b) find the west component of -->
                                          B
c) find -->    -->
           A  +  B




THANKYOU

OMG lol caramel got it just before me

The resultant vector is achieved by placing two vectors head to tail and finding the displacement between the ends... soo... (look at attached image)

1. By making the 20m S vector negative, you reverse its direction. Now you have two vectors heading north, and adding them you get the resultant vector 40m N.

2. I don't know what you mean by km-1 so I'll just take it to mean km. Here we just move vector A so its head is at B's tail. As the angle between them is , it's just a right triangle and km E.

3. a) South component of B is found by trigonometry: km S.
   b) West component is also km W.
   c) The resultant vector is found using the Law of Cosines.

km

The direction of the vector will be where by the Law of sines,





So the bearing of the resultant vector is
« Last Edit: July 08, 2008, 04:40:12 pm by DivideBy0 »
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hard

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Re: HELP! VECTORS
« Reply #14 on: July 08, 2008, 04:45:24 pm »
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that's quite simple if you think about it :P silly me. no but thanks for the hlp guy, you are great. GREAT.
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