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June 20, 2025, 03:23:43 am
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Author Topic: Last Question of Exam 2?  (Read 14932 times)  Share 

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paulsterio

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Last Question of Exam 2?
« on: November 09, 2011, 02:39:16 pm »
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What did everyone get for the last part of the last question in the Methods Exam 2?! D:
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dking123

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Re: Last Question of Exam 2?
« Reply #1 on: November 09, 2011, 02:41:41 pm »
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some weird as surd?
it said values but i couldnt find any more :(
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chrysalis

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Re: Last Question of Exam 2?
« Reply #2 on: November 09, 2011, 02:44:03 pm »
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I only got one value too :/
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paulsterio

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Re: Last Question of Exam 2?
« Reply #3 on: November 09, 2011, 02:44:48 pm »
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I got k less than or equal to that value :S
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ttn

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Re: Last Question of Exam 2?
« Reply #4 on: November 09, 2011, 02:46:30 pm »
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I got K>= 5root(37)/74? no idea if it's right
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chrysalis

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Re: Last Question of Exam 2?
« Reply #5 on: November 09, 2011, 02:48:01 pm »
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Oh, I got that! I just used = though :/
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BubbleWrapMan

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Re: Last Question of Exam 2?
« Reply #6 on: November 09, 2011, 02:48:37 pm »
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Quote from: ttn on November 09, 2011, 02:46:30 pm
I got K>= 5root(37)/74? no idea if it's right
I got this
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thatisanote

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Re: Last Question of Exam 2?
« Reply #7 on: November 09, 2011, 02:48:42 pm »
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Quote from: ttn on November 09, 2011, 02:46:30 pm
I got K>= 5root(37)/74? no idea if it's right

That's what my math teacher had. But he didn't spend ages on it so it could be <=

I just had = to, so i'll lose 1 mark.
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b^3

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Re: Last Question of Exam 2?
« Reply #8 on: November 09, 2011, 02:48:52 pm »
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Quote from: ttn on November 09, 2011, 02:46:30 pm
I got K>= 5root(37)/74? no idea if it's right
Yeh I got a greater than or equal to aswell, I'm not 100% sure but I think those are the numbers I got ttn. Did you do it by the subbing in x=root(7)/2 and dt/dx=0?

Also nice post count.
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ttn

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Re: Last Question of Exam 2?
« Reply #9 on: November 09, 2011, 02:50:27 pm »
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I did >= as I noticed it was larger than the other K value they gave and since K is proportional to the distance, the larger, the slower he will be swimming in the river? so he may as well go straight to it.
« Last Edit: November 09, 2011, 02:54:49 pm by ttn »
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paulsterio

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Re: Last Question of Exam 2?
« Reply #10 on: November 09, 2011, 02:53:27 pm »
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Quote from: ttn on November 09, 2011, 02:46:30 pm
I got K>= 5root(37)/74? no idea if it's right

why greater than?
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b^3

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Re: Last Question of Exam 2?
« Reply #11 on: November 09, 2011, 02:55:02 pm »
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Quote from: ttn on November 09, 2011, 02:50:27 pm
I did >= as I noticed it was larger than the other K value they gave and since K is the proportion of the distance, the larger, the slower he will be swimming in the river? so he may as well go straight to it.
Yeh, I also found out what the value of T would be in terms of k, and realising that there was a negative in front of the K, as K increased Time decreased and so he had to take the direct route.
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acinod

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Re: Last Question of Exam 2?
« Reply #12 on: November 09, 2011, 02:57:08 pm »
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k E [0,5root(37)/74]
remember k is a positive constant.
Hopefully I get one mark for saying it's more than or equal to zero since it's positive.

Edit: or maybe not...apparently the answer might be something else...
« Last Edit: November 09, 2011, 02:59:10 pm by acinod »
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bobby1470

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Re: Last Question of Exam 2?
« Reply #13 on: November 09, 2011, 03:00:13 pm »
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since he runs directly there and doesnt swim at all, isnt k negligible? :S
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BubbleWrapMan

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Re: Last Question of Exam 2?
« Reply #14 on: November 09, 2011, 03:01:42 pm »
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Quote from: paulsterio on November 09, 2011, 02:53:27 pm
Quote from: ttn on November 09, 2011, 02:46:30 pm
I got K>= 5root(37)/74? no idea if it's right

why greater than?
The larger k is, the longer it takes to swim up, so it will be practical to take the direct path if it is greater than or equal to... that.

That's what I think...
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