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Last edited by Raeryn at 3:00 pm, Aug 21 2015

You could just go wind up a clock and see it for yourself. lol

The hour hand has be between 3 and 4, so it's between 3:00 and 4:00. (common sense says it's 3:xx)

Now, you need two equations. One to represent the hour hand. one to represent the minute hand.
Let x represent the the minute.
At time x = 3:00 (or just m=0)
Hour hand is at 3 (aka h=3/12)
Min hand is at 12 (aka 0/60)
At time x = 4:00 (or 60)
Hour hand is at 4 (aka 4/12)
Min hand is again at 12 (aka 60/60)

Taking the difference we can express the hour hand like so:
h = 3/12 + x/60/12
And the minute hand like so:
m = x/60

Now we're looking for equality, so 3/12 + x/60/12 = x/60
Lets factor (*12) => 3 + x/60 = 12x/60
again simplify => 3 = 11x/60
and some more => x = 16.36363636... (180/11)

So at 3:16.36363636, they are on top of each other.
or
~03:16:22

Or a cleaner solution:
http://www.wolframalpha.com/input/?i=3%2F12+%2B+x%2F60%2 F12+%3D+x%2F60
And you can see the graph here:
http://www.wolframalpha.com/input/?i=Plot%5B%7B3%2F12+%2B +x%2F60%2F12%2C+x%2F60%7D%2C+%7Bx%2C+0%2C+60%7D %5D

Last edited by Grumpy at 2:47 pm, Sep 11 2010

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[b]Batoto

I get it but the formula I need isn't the one you just mentioned .
I need the formula for sequences

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Chick3n!!!!
Fo0d!!!!

Just convert it then....

min_n = min_(n-1) + 1/60
or
min_n = n/60. lol
and so on...

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[b]Batoto

Hi guys, so this is the deal. I'm curently in my last year of college (12th grade), and for my end of course project I decided on making a EVA-01 PC case acompanied by a game.

The thing is I'm new to moding and I don't know how I'm going to make the model, I'd realy apreciate some help and sugestions.

Thank you in advance.

This wiki links tells you about various programs for graphic modeling

NX and SolidWorks are the two main programs I know.

However most cost a lot of money. So ask your school if they have these kind of programs as a general licence.

Also TrueSpace is free. http://en.wikipedia.org/wiki/TrueSpace

Remember, you're suppose to learn a lot of stuff in your senior project so....you kind of have to do this yourself.

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Gay book discussion thread

The game will be made in some language using sprites as models, what I have trouble with is building the actual PC case, where the motherboard and the other hardware will go in.

Hello! I am in need of some calculus help! I have a test tomorrow, and I'm doing review problems. The problem I'm doing is on implicit differentiation, but I don't know to how differentiate a certain part of the problem.

Click HERE to see the problem!!!!

EDIT-- Oh yeah, the answer to the problem is 1/[y(x+1)^2] in case you need to check what you got or something. :] Thanks again!

Last edited by PeachMangoTea at 6:48 pm, Sep 23 2010

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I was gonna help and I thought I knew how to do it... but I got the wrong answer. Guess it's been longer than I thought since I last solved one of those...
But this site: http://calc101.com/webMathematica/derivatives.jsp should help you lots for your calculus needs. (has integrals too)

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[b]Batoto

y^2 = (x-1)/(x+1)
(y^2)*(x+1) = x-1
x*y^2 + y^2 = x-1

Differentiating implicitly with respect to x:

y^2 + 2xy*(dy/dx) + 2y*(dy/dx) = 1
2xy*(dy/dx) + 2y*(dy/dx) = 1 - y^2
(2xy + 2y)*(dy/dx) = 1 - y^2
(x+1)*2y*(dy/dx) = 1 - y^2
2y*(dy/dx) = (1 - y^2)/(1+x)
2y*(dy/dx) = (1 - [x-1]/[x+1])/(1+x)
2y*(dy/dx) = 1/[1+x] - (x-1)/([x+1]^2)
2y*(dy/dx) = (x+1)/([x+1]^2) - (x-1)/([x+1]^2)
2y*(dy/dx) = [(x+1) - (x-1)]/[(x+1)^2]
2y*(dy/dx) = 2/[(x+1)^2]

(dy/dx) = 1/[y*(x+1)^2]


I totally forgot how to do this also, but that's why we have cliff notes!
http://www.cliffsnotes.com/study_guide/Implicit-Differentiation.top icArticleId-39909,articleId-39882.html

i'm not at calculus yet... so i can't help u srry

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D'oh!

I need help with calculus homework....... again!!!! >____>;;

So tomorrow, I have a free response quiz over #2 of the college-board-released AP calculus AB 2010 free response questions. Problem #2 is on the third page of this PDF link:
http://apcentral.collegeboard.com/apc/public/repository/ap10_f rq_calculus_ab.pdf

Here are the solutions to the parts of this problem (#2):
http://home.roadrunner.com/~alcosser/ABBC2_10.pdf

Okay. On part (c), how do they get 16 from the integral? What I need to know is this... Did they plug the equation P(t) into the integral, differentiate, and then plug 12 into the differentiated equation minus plugging in 8 into the differentiated equation?

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Hmm, ok! Let me see... I'll tackle the 16. The 16 comes from the integral of P(t).
I'm horrible at explaining, but I will try.

P(t) is a function that says how many entrees are processed per hour. The integral is like multipling times -- time... or in this case, hours. Thus you're left with entrees processed :3 The limits are there because you want to know how many were processed from 8pm-12. A way to think of the integral is an accumulator-- it's accumulating how many were processed each hour... each minute... each second... and adding them to give you the total processed

Oh, and also.. this is a calculator problem. But if you want to know how to do it manually.
1) Integrate P(t)
2) Plug the top limit and get an answer.
3) Do it again but with the second.
4) Subtract the first from the second.

This comes from the 2nd fundamental theorem of calculus... (I took AP Calculus BC last year so it's hard to recall all the names)


Last edited by Mizi at 6:40 pm, Oct 7 2010

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Ah! Thank you sooo so much! I guess I did know what to do, I just didn't think my though process was right!


Yes, I took the AB test last year... with this exact same free response problem and had NO idea how to do it. >__< But this semester I am in Calculus 2, which is after AB that includes the rest of what BC covered. I heard the BC test last year was rape! @___@ Haha.

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ahh~ someone help me with this!! I have limited to send this in! someone help me
I can't find the answer!! ;_;

help meh~
this is the question --> http://tinypic.com/r/2zfrcjt/7

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I hear you say "Why?" Always "Why?" You see things; and you say "Why?" But I dream things that never were; and I say "Why not?"