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 Math geeks, assemble!



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May 18, 2009, 06:26:28 pm
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Offline Archz

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Math geeks, assemble!
« on: May 18, 2009, 06:26:28 pm »
So, theres a math problem that is haunting me:

d)

"(...) after 5 second a parachutist releases his parachute. We assume that the air resistance (drag) will now become -k * v(t)^2. We set g = 10 and k = 8."

"Use Newtons 2. law to set up a differential equation for the situation when the parachute opens."

(The guy weighs 80 kg)

ma = mg - L

ma = mg - (kv^2)

v'(t) + k/m * v^2 = g

v'(t) + 0.1v(t)^2 = 10

So far so good I think

but then:

e) "The differential equation in d) is separable. Set v instead of v(t). Show that we can write the differential as: (attachment)"

f) "Find an expression for v by solving the differential equation in e)"

« Last Edit: May 19, 2009, 09:53:06 pm by Archz »

May 18, 2009, 06:31:45 pm
Reply #1

Offline Grishnag

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Re: Math geeks, assemble!
« Reply #1 on: May 18, 2009, 06:31:45 pm »
EEEEEEEEEEEEWWWWWWWWWWWWWWHHHHHHHHHH math
"No matter where you go in life, Keep an eye out for Johnny the tackling Alzheimer patient" - Dr. Perry Cox
MAIM! KILL! BURN! BLOOD FOR THE BLOOD GOD! SKULLS FOR THE SKULL THRONE!

May 18, 2009, 06:37:50 pm
Reply #2

Offline Archz

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Re: Math geeks, assemble!
« Reply #2 on: May 18, 2009, 06:37:50 pm »
Thank you Grish :p

I was well aware that my chances were slim, but I've had help from the guild before!

Come on, halp plox!
« Last Edit: May 18, 2009, 06:53:16 pm by Archz »

May 18, 2009, 06:55:16 pm
Reply #3

Offline Palmar

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Re: Math geeks, assemble!
« Reply #3 on: May 18, 2009, 06:55:16 pm »
I'll look at it, though my physics are a bit rusty...

But can you please photograph/scan the entire thing so it's not horribly set up?
Trolls are awesome!

May 18, 2009, 07:03:59 pm
Reply #4

Offline Archz

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Re: Math geeks, assemble!
« Reply #4 on: May 18, 2009, 07:03:59 pm »
It's in Norwegian :p

The first thingie is the calculations that I have made, if you grap some paper and write down the last differential that is underlined, it might be easier.

May 18, 2009, 07:20:29 pm
Reply #5

Offline kagemoth

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Re: Math geeks, assemble!
« Reply #5 on: May 18, 2009, 07:20:29 pm »

Insanity doesn't run in my family. Rather, it strolls through, taking its time, getting to know everyone personally.

May 18, 2009, 08:05:44 pm
Reply #6

Offline Starbrow

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Re: Math geeks, assemble!
« Reply #6 on: May 18, 2009, 08:05:44 pm »
I'd love to help, although I'd like to see the paper, instead of your attempt at explaining, even if it's norwegian...
Feral, a class of its own.

Alamo - REMEMBERS- HEEL BARES DURID! BARE DURIDS IS STORNG FREND!

May 18, 2009, 09:36:31 pm
Reply #7

Offline Palmar

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Re: Math geeks, assemble!
« Reply #7 on: May 18, 2009, 09:36:31 pm »
best part is, he didn't even define the variables :)

For your own good, shape up on format!

And yes, let us see the paper, even if it's in norwegian.
Trolls are awesome!

May 18, 2009, 09:46:39 pm
Reply #8

Offline Archz

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Re: Math geeks, assemble!
« Reply #8 on: May 18, 2009, 09:46:39 pm »
http://www.ulven.biz/r2/eksamen/r2_eksempel.pdf

Sorry, thought the variables kinda explained themselves ^^

May 19, 2009, 12:00:52 am
Reply #9

Offline Supremacy

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Re: Math geeks, assemble!
« Reply #9 on: May 19, 2009, 12:00:52 am »
OMG NOOOO MATH!!!! IT FOLLOWED ME EVEN HERE!


"Some rise by sin, and some by virtue fall"

May 19, 2009, 10:02:12 am
Reply #10

Offline Goza

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Re: Math geeks, assemble!
« Reply #10 on: May 19, 2009, 10:02:12 am »

May 19, 2009, 01:27:42 pm
Reply #11

Offline Daekesh

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Re: Math geeks, assemble!
« Reply #11 on: May 19, 2009, 01:27:42 pm »
Is that Shiftey?!
Moo

Itkovian
Daekesh
Caladan
Hetan


May 19, 2009, 02:05:36 pm
Reply #12

Offline Supremacy

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Re: Math geeks, assemble!
« Reply #12 on: May 19, 2009, 02:05:36 pm »


"Some rise by sin, and some by virtue fall"

May 19, 2009, 04:07:38 pm
Reply #13

Offline Archz

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Re: Math geeks, assemble!
« Reply #13 on: May 19, 2009, 04:07:38 pm »
Come on guys, exam tomorrow!

Starbrow, Palmar, Tyler! Braintrust gooo!

May 19, 2009, 04:36:35 pm
Reply #14

Offline Shiftey

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Re: Math geeks, assemble!
« Reply #14 on: May 19, 2009, 04:36:35 pm »

 

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