vaklas Posted January 20, 2011 Report Share Posted January 20, 2011 Hi, Monday is the deadline for my portfolio and I can understand the last question about the assumptions of the model and the limitations of it when applied to other situations. Can somebody help me, I am really stuck !! Reply Link to post Share on other sites More sharing options...
dessskris Posted January 22, 2011 Report Share Posted January 22, 2011 (edited) Hi, Monday is the deadline for my portfolio and I can understand the last question about the assumptions of the model and the limitations of it when applied to other situations. Can somebody help me, I am really stuck !!I'm not doing this portfolio yet but I guess some assumptions would be:[Removed by moderator]There may be some more I can't think of. The limitation would be those assumptions. People and dogs do not run in constant speeds and dogs won't be as smart as Buddy to catch up with Angie like that. Edited June 13, 2011 by Keel Reply Link to post Share on other sites More sharing options...
StephenDavis Posted January 24, 2011 Report Share Posted January 24, 2011 Does anyone know the recursive formula for this? im extremly confused and any input would be much appreciated. Reply Link to post Share on other sites More sharing options...
biosurvival Posted January 28, 2011 Report Share Posted January 28, 2011 Hi Can someone please answer the part about the recursive formula. I downloaded Function Generator but don't seem to understand how to use it. I found some interesting coorelations, but they only work after finding the coordinates which is pointless, because when it comes to the other part where speed, initial distance and all that is changed, it would take so much time to calculate and then test the formula. It is already taking to long for the dog to reach the lake, i've calculated more than 35 coordinates of buddy and he still didnt reach the lake. Please is there any way to do it faster than manually doing it. Reply Link to post Share on other sites More sharing options...
patronymic Posted February 6, 2011 Report Share Posted February 6, 2011 On the sheet, when they ask us 'choose reasonable values for angie's running speed......' are they asking us to make up the speeds, or do we calculate them with the information given by our teacher? Reply Link to post Share on other sites More sharing options...
dessskris Posted February 6, 2011 Report Share Posted February 6, 2011 On the sheet, when they ask us 'choose reasonable values for angie's running speed......' are they asking us to make up the speeds, or do we calculate them with the information given by our teacher?I would say you got to make up reasonable values for the speed. like, really reasonable values, chosen with common sense. of course Angie's speed can't be like 100 m/s maybe less than 5 m/s? so it doesn't really have something to do with the given data, I suppose. Reply Link to post Share on other sites More sharing options...
cank92 Posted February 9, 2011 Report Share Posted February 9, 2011 We were given the same portfolio and what I can say is that no one in my class has a clue about the assignment. It is very challenging and I could use some help. At least, can someone give me a hint about where to start? Reply Link to post Share on other sites More sharing options...
patronymic Posted February 14, 2011 Report Share Posted February 14, 2011 I can't seem to get a recursive formula. Any tips on what i should look at to get the formula? Reply Link to post Share on other sites More sharing options...
StarSecret Posted February 19, 2011 Report Share Posted February 19, 2011 Can someone please tell me which software to use for drawing diagrams sowing different positions of angie and buddy , drawing horizontal and vertical lines? Reply Link to post Share on other sites More sharing options...
asdfasdf Posted February 21, 2011 Report Share Posted February 21, 2011 I have been pondering this recursive formula for hours but have come up with nothing. If someone could just point me in the right direction it would be greatly appreciated. Thanks Reply Link to post Share on other sites More sharing options...
smrtrf Posted February 21, 2011 Report Share Posted February 21, 2011 hey so what counts as meetingis it alright to assume that anything under 1m is buddy catching up with angieand if buddy crosses the y axis by -2E-9m does that count as "plunging into the lake" or is it still valid ps: who else hates buddy?I have been pondering this recursive formula for hours but have come up with nothing. If someone could just point me in the right direction it would be greatly appreciated. Thanks just use basic trig.think of how you found buddy's coordinates for the question before thatand just apply it for general terms (hope this helps) Reply Link to post Share on other sites More sharing options...
asdfasdf Posted February 21, 2011 Report Share Posted February 21, 2011 just use basic trig.think of how you found buddy's coordinates for the question before thatand just apply it for general terms (hope this helps)I've been trying something similar.For your x-value, you know that x= √(x² + y²)cosθ (by rearanging cosθ=a/h), and same thing for your y-value except you use sinθ.I am stuck on creating a recursive formula though.Any more help would be greatly appreciated.hey so what counts as meetingis it alright to assume that anything under 1m is buddy catching up with angieand if buddy crosses the y axis by -2E-9m does that count as "plunging into the lake" or is it still valid They will eventually meet at one given point. The moment Buddy reaches the edge of the lake, he will just continue directly north until he catches up to Angie. This is the point that you are looking for. Reply Link to post Share on other sites More sharing options...
mvosicky Posted February 23, 2011 Report Share Posted February 23, 2011 oh brilliant i got 13/20 for this crap and i had like 40 pages ... i have to go start modelling a functional building now then Reply Link to post Share on other sites More sharing options...
1993ha Posted February 24, 2011 Report Share Posted February 24, 2011 Anyone knows how to use diagram to plot the positions and directions of Angie and Buddy? Reply Link to post Share on other sites More sharing options...
gr12ibsucks Posted February 24, 2011 Report Share Posted February 24, 2011 I have only just started this portfolio but need help on finding buddy's coordinates,i've drawn the diagram but don't understand where to place all the numbers... I chose 2m/s for angie and 4 for buddy and my teacher gave us 300m for the initial distance and 10s, which means each slope is 10 right? but I don't get where the other numbers fit in. eg.is the speed on the y-axis?and even if i knew where to put the figures, I still don't understand how to find the coordinates!please somebody provide me with some guidance, seriously desperate,, it's due in a few days.thanks in advance Reply Link to post Share on other sites More sharing options...
bigpocho Posted February 28, 2011 Report Share Posted February 28, 2011 can someone help me get started?? do you figure out an equation based on the information your teacher gives you and where you want buddy and angie to meet??? do you come up speeds for each and then decide on the function??? im a little confused.....You decide the speeds, then find the coordinates of Buddy's position at different times based on the speeds and the info your teacher gave you. Then you figure out the equation.i know im late. but you can find the second coordinate of buddy using pythagoras. then you can extend the hypotenuses and figure out their lenghts and construct right angles triangles by extending each hypotenuse to touch the x-axis. Reply Link to post Share on other sites More sharing options...
tj14 Posted March 4, 2011 Report Share Posted March 4, 2011 How do u find the recursive formula!!!!and how do u use derivative in this thing?how do you get √(x² + y²) just use basic trig.think of how you found buddy's coordinates for the question before thatand just apply it for general terms (hope this helps)I've been trying something similar.For your x-value, you know that x= √(x² + y²)cosθ (by rearanging cosθ=a/h), and same thing for your y-value except you use sinθ.I am stuck on creating a recursive formula though.Any more help would be greatly appreciated.hey so what counts as meetingis it alright to assume that anything under 1m is buddy catching up with angieand if buddy crosses the y axis by -2E-9m does that count as "plunging into the lake" or is it still valid They will eventually meet at one given point. The moment Buddy reaches the edge of the lake, he will just continue directly north until he catches up to Angie. This is the point that you are looking for.how do u get √(x² + y²) Reply Link to post Share on other sites More sharing options...
bigpocho Posted March 5, 2011 Report Share Posted March 5, 2011 how do you find the recursive formula? please help Reply Link to post Share on other sites More sharing options...
Khaoniao Posted March 8, 2011 Report Share Posted March 8, 2011 How does one approach the recursive formula? Reply Link to post Share on other sites More sharing options...
tj14 Posted March 8, 2011 Report Share Posted March 8, 2011 3 pages of doubts and no answer.... how could one possibly rely on this site? 1 Reply Link to post Share on other sites More sharing options...
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