2 point question
 

Katies Turn! Your five minutes starts now.

"Bart Senior" wrote in message
. ..
You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

2 point question
 

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

2 point question
 

do we assume the distance covered is equal in all directions, or are you
saying it doesn't matter?
Scout

"Bart Senior" wrote in message
. ..
You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

2 point question
 

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector

you can't draw a vector between positions without knowing (in this case) speed
over ground. The distance between positions is a scalar, the direction is not
determinable from your data.

between your starting
position and your final position. What would you
call that vector?

2 point question
 

On Sun, 04 Jul 2004 04:53:15 GMT, "Bart Senior"
wrote:

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)


Cheers!


Remco

2 point question
 

that's what I was thinking but didn't want to assume anything : )
Scout

"Remco Moedt" wrote in message
...
On Sun, 04 Jul 2004 04:53:15 GMT, "Bart Senior"
wrote:

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)


Cheers!


Remco

2 point question
 

a dot is not a vector. try again.

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)


Cheers!


Remco

2 point question
 

a dot is not a vector.

that's what I was thinking but didn't want to assume anything : )
Scout

"Remco Moedt" wrote in message
.. .
On Sun, 04 Jul 2004 04:53:15 GMT, "Bart Senior"
wrote:

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)


Cheers!


Remco

2 point question
 

Bart Senior wrote:
You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

Leeway?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

"Wally" wrote in message
...
| Bart Senior wrote:
| You sail directly East for 14 hours,
| then South for 14 hours,
| and then West for 14 hours,
| and then North again for 14 hours.
|
| Now if you draw a vector between your starting
| position and your final position. What would you
| call that vector?
|
| Leeway?

To be accurate you would need the start and end coordinates. The vector
between the 2 if any could be calculated.... but the point is moot. If all
speeds and bearings [no leeway] were constant you would be at your starting
point.

I believe Bart is having some fun! ;-)

Got that compass boxed yet Bart?

CM

2 point question
 

yes I know, that is the point (no pun intended)
Scout

"JAXAshby" wrote in message
...
a dot is not a vector.

that's what I was thinking but didn't want to assume anything : )
Scout

"Remco Moedt" wrote in message
.. .
On Sun, 04 Jul 2004 04:53:15 GMT, "Bart Senior"
wrote:

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)


Cheers!


Remco

2 point question
 

Bart Senior wrote:

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

Track made good.


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

Capt. Mooron wrote:

To be accurate you would need the start and end coordinates. The
vector between the 2 if any could be calculated.... but the point is
moot. If all speeds and bearings [no leeway] were constant you would
be at your starting point.

Speeds haven't been stated, so they can't be assumed to be constant.


I believe Bart is having some fun! ;-)

The spanner in the works is idea that it's a round trip.


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

"Wally" wrote in message
...
| Capt. Mooron wrote:
|
| To be accurate you would need the start and end coordinates. The
| vector between the 2 if any could be calculated.... but the point is
| moot. If all speeds and bearings [no leeway] were constant you would
| be at your starting point.
|
| Speeds haven't been stated, so they can't be assumed to be constant.

Without the speeds you have no position to calc a vector... thus constant
speed must be assumed.

|
|
| I believe Bart is having some fun! ;-)
|
| The spanner in the works is idea that it's a round trip.

Without the speeds that determination can neither be assumed nor denied.

Of course the vector could be 0 degrees T. ;-)

CM

2 point question
 

Capt. Mooron wrote:

Speeds haven't been stated, so they can't be assumed to be constant.

Without the speeds you have no position to calc a vector... thus
constant speed must be assumed.

ISTM that speed is unknown, so no assumption can be made.


I believe Bart is having some fun! ;-)
The spanner in the works is idea that it's a round trip.

Without the speeds that determination can neither be assumed nor
denied.

I meant that the wording of the question is such that the unwary might
assume that it is a round trip - which it could be - but it might not be.
The vector can be anything, IOW, so I think he's looking for the name of the
resultant vector, and not its magnitude.


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

our physics professor used to smack our knuckles for saying speed and not
velocity. What a grump.
Scout

"Capt. Mooron" wrote in message
...

"Wally" wrote in message
...
| Capt. Mooron wrote:
|
| To be accurate you would need the start and end coordinates. The
| vector between the 2 if any could be calculated.... but the point is
| moot. If all speeds and bearings [no leeway] were constant you would
| be at your starting point.
|
| Speeds haven't been stated, so they can't be assumed to be constant.

Without the speeds you have no position to calc a vector... thus constant
speed must be assumed.

|
|
| I believe Bart is having some fun! ;-)
|
| The spanner in the works is idea that it's a round trip.

Without the speeds that determination can neither be assumed nor denied.

Of course the vector could be 0 degrees T. ;-)

CM

2 point question
 

"Wally" wrote in message

| I meant that the wording of the question is such that the unwary might
| assume that it is a round trip - which it could be - but it might not be.
| The vector can be anything, IOW, so I think he's looking for the name of
the
| resultant vector, and not its magnitude.


Astute.... but COG has been deprived of SOG and my ETA is now as dubious as
my DR ... now I need a drink of Rhumb! :-)

CM

2 point question
 

btw - I've used my saved sailing gps tracks in the classroom - the physics
teacher projected them onto the board and had the students work out vectors
and so forth.
Scout

"Bart Senior" wrote in message
. ..
You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

2 point question
 

So what did your Prof refer to the vector between your departure coordinates
and your arrival coordinates?

CM

"Scout" wrote in message
...
| btw - I've used my saved sailing gps tracks in the classroom - the physics
| teacher projected them onto the board and had the students work out
vectors
| and so forth.
| Scout
|
| "Bart Senior" wrote in message
| . ..
| You sail directly East for 14 hours,
| then South for 14 hours,
| and then West for 14 hours,
| and then North again for 14 hours.
|
| Now if you draw a vector between your starting
| position and your final position. What would you
| call that vector?
|
|
|
|

2 point question
 

Capt. Mooron wrote:

Astute.... but COG has been deprived of SOG and my ETA is now as
dubious as my DR ... now I need a drink of Rhumb! :-)

I now realise that the whole journey is a red herring - he never said
anything about the final position being worked out as a DR. It could just as
easly be observed or GPS. He might as well have said...

You start at X, sail about for a bit, and finish at Y.
What's the vector from X to Y called?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

sorry, I was flirting with a math teacher at the time.
Scout

"Capt. Mooron" wrote in message
...
So what did your Prof refer to the vector between your departure
coordinates
and your arrival coordinates?

CM

"Scout" wrote in message
...
| btw - I've used my saved sailing gps tracks in the classroom - the
physics
| teacher projected them onto the board and had the students work out
vectors
| and so forth.
| Scout
|
| "Bart Senior" wrote in message
| . ..
| You sail directly East for 14 hours,
| then South for 14 hours,
| and then West for 14 hours,
| and then North again for 14 hours.
|
| Now if you draw a vector between your starting
| position and your final position. What would you
| call that vector?
|
|
|
|

2 point question
 

Ah... Yes.... calculating a vector between "Legs".... one of my favourite
navigational pastimes. ;-)

CM

"Scout" wrote in message
...
| sorry, I was flirting with a math teacher at the time.
| Scout
|
| "Capt. Mooron" wrote in message
| ...
| So what did your Prof refer to the vector between your departure
| coordinates
| and your arrival coordinates?
|
| CM
|
| "Scout" wrote in message
| ...
| | btw - I've used my saved sailing gps tracks in the classroom - the
| physics
| | teacher projected them onto the board and had the students work out
| vectors
| | and so forth.
| | Scout
| |
| | "Bart Senior" wrote in message
| | . ..
| | You sail directly East for 14 hours,
| | then South for 14 hours,
| | and then West for 14 hours,
| | and then North again for 14 hours.
| |
| | Now if you draw a vector between your starting
| | position and your final position. What would you
| | call that vector?
| |
| |
| |
| |
|
|
|
|

2 point question
 

A theory exercise?

:P

Cheers

Capt. Mooron wrote:

Ah... Yes.... calculating a vector between "Legs".... one of my favourite
navigational pastimes. ;-)

CM

"Scout" wrote in message
...
| sorry, I was flirting with a math teacher at the time.
| Scout
|
| "Capt. Mooron" wrote in message
| ...
| So what did your Prof refer to the vector between your departure
| coordinates
| and your arrival coordinates?
|
| CM
|
| "Scout" wrote in message
| ...
| | btw - I've used my saved sailing gps tracks in the classroom - the
| physics
| | teacher projected them onto the board and had the students work out
| vectors
| | and so forth.
| | Scout
| |
| | "Bart Senior" wrote in message
| | . ..
| | You sail directly East for 14 hours,
| | then South for 14 hours,
| | and then West for 14 hours,
| | and then North again for 14 hours.
| |
| | Now if you draw a vector between your starting
| | position and your final position. What would you
| | call that vector?
| |
| |
| |
| |
|
|
|
|

2 point question
 

"Bart Senior" wrote in message
. ..
You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A Tidal vector.


Regards


Donal
--

2 point question
 

If you don't have the theory down pat.... how in the world will you pass the
practical?

CM

"Nav" wrote in message
...
| A theory exercise?
|
| :P
|
| Cheers
|
| Capt. Mooron wrote:
|
| Ah... Yes.... calculating a vector between "Legs".... one of my
favourite
| navigational pastimes. ;-)
|
| CM
|
| "Scout" wrote in message
| ...
| | sorry, I was flirting with a math teacher at the time.
| | Scout
| |
| | "Capt. Mooron" wrote in message
| | ...
| | So what did your Prof refer to the vector between your departure
| | coordinates
| | and your arrival coordinates?
| |
| | CM
| |
| | "Scout" wrote in message
| | ...
| | | btw - I've used my saved sailing gps tracks in the classroom - the
| | physics
| | | teacher projected them onto the board and had the students work
out
| | vectors
| | | and so forth.
| | | Scout
| | |
| | | "Bart Senior" wrote in message
| | | . ..
| | | You sail directly East for 14 hours,
| | | then South for 14 hours,
| | | and then West for 14 hours,
| | | and then North again for 14 hours.
| | |
| | | Now if you draw a vector between your starting
| | | position and your final position. What would you
| | | call that vector?
| | |
| | |
| | |
| | |
| |
| |
| |
| |
|
|
|

2 point question
 

Wally,

That "VECTOR" would be called "DRIFT"

Drift would include leeway, tide, deviation and variation, windage,
helmsmans error, etc. Drawn from the starting point to present position

Ole Thom

HAPPY 4th

2 point question
 

yes I know, that is the point (no pun intended)
Scout

no it wasn't the point. the point was the question lacked sufficient data to
form an answer.

btw, a point is not a vector either.

a dot is not a vector.

2 point question
 

wally, go back to study hall. lunch is not for another 45 minutes.

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

Leeway?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

Speeds haven't been stated, so they can't be assumed to be constant.

speeds are never constant, so assuming such can put you on the rocks.

in addition, any set, any drift will have you someplace else.

wally, go back to study hall. lunch is not for another 45 minutes.

2 point question
 

Of course the vector could be 0 degrees T. ;-)

no such vector exists. *that* is a direction, moron.



CM

2 point question
 

so I think he's looking for the name of the
resultant vector, and not its magnitude.

vectors ALWAYS have magnitude, wally. go back to study hall.



--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

Constant speed.

Scout wrote

do we assume the distance covered is equal in all directions, or are you
saying it doesn't matter?
Scout

"Bart Senior" wrote

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

2 point question
 

our physics professor used to smack our knuckles for saying speed and not
velocity. What a grump.
Scout

speed is a scalar, velocity is a vector. rather different breeds of cats.

2 point question
 

The solution is a vector.

Remco Moedt wrote

On Sun, 04 Jul 2004 04:53:15 GMT, "Bart Senior"
wrote:

You sail directly East for 14 hours,
then South for 14 hours,
and then West for 14 hours,
and then North again for 14 hours.

Now if you draw a vector between your starting
position and your final position. What would you
call that vector?

A dot. :-)

Remco

2 point question
 

You can assume they are constant.

Wally wrote in message
...
Capt. Mooron wrote:

To be accurate you would need the start and end coordinates. The
vector between the 2 if any could be calculated.... but the point is
moot. If all speeds and bearings [no leeway] were constant you would
be at your starting point.

Speeds haven't been stated, so they can't be assumed to be constant.


I believe Bart is having some fun! ;-)

The spanner in the works is idea that it's a round trip.


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

JAXAshby wrote:

Speeds haven't been stated, so they can't be assumed to be constant.

speeds are never constant, so assuming such can put you on the rocks.
in addition, any set, any drift will have you someplace else.
wally, go back to study hall. lunch is not for another 45 minutes.

Was it the "can't" part of "they can't be assumed to be constant" that you
failed to discern the meaning of?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

btw - I've used my saved sailing gps tracks in the classroom - the physics
teacher projected them onto the board and had the students work out vectors
and so forth.
Scout

high school teacher, right? Or maybe a community college teacher?

2 point question
 

Bart Senior wrote:

You can assume they are constant.

Is the start point 7 miles north of the Equator?


--
Wally
www.artbywally.com
www.wally.myby.co.uk

2 point question
 

Pat will tell you that there is no theoretical great lover...

;)

Cheeers

Capt. Mooron wrote:

If you don't have the theory down pat.... how in the world will you pass the
practical?

CM

"Nav" wrote in message
...
| A theory exercise?
|
| :P
|
| Cheers
|
| Capt. Mooron wrote:
|
| Ah... Yes.... calculating a vector between "Legs".... one of my
favourite
| navigational pastimes. ;-)
|
| CM
|
| "Scout" wrote in message
| ...
| | sorry, I was flirting with a math teacher at the time.
| | Scout
| |
| | "Capt. Mooron" wrote in message
| | ...
| | So what did your Prof refer to the vector between your departure
| | coordinates
| | and your arrival coordinates?
| |
| | CM
| |
| | "Scout" wrote in message
| | ...
| | | btw - I've used my saved sailing gps tracks in the classroom - the
| | physics
| | | teacher projected them onto the board and had the students work
out
| | vectors
| | | and so forth.
| | | Scout
| | |
| | | "Bart Senior" wrote in message
| | | . ..
| | | You sail directly East for 14 hours,
| | | then South for 14 hours,
| | | and then West for 14 hours,
| | | and then North again for 14 hours.
| | |
| | | Now if you draw a vector between your starting
| | | position and your final position. What would you
| | | call that vector?
| | |
| | |
| | |
| | |
| |
| |
| |
| |
|
|
|

2 point question
 

A cat is not a vector.

Cheers

JAXAshby wrote:

our physics professor used to smack our knuckles for saying speed and not
velocity. What a grump.
Scout


speed is a scalar, velocity is a vector. rather different breeds of cats.