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tosxyChor
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PostPosted: Sat 17 Oct, 2009  Reply with quote

Problem 2:
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Problem 3:
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PostPosted: Sun 18 Oct, 2009  Reply with quote

Not having math problems but I found a few interesting mathematical stuff tounge1

You can for example turn around 12*12=144 to 441=21*21

Same thing goes for 13*13=169|961=31*31 or 11*11=121|121=11*11 tounge2


The answer to everything^2 is 1764 and 1337^2 is 1787569 grin

Im trying to find more funny patterns :D



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Bombax
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PostPosted: Mon 19 Oct, 2009  Reply with quote

Something notable is that

[13.37 * pi] = 42

where [x] denotes the largest possible integer that is < x. Actually, even without the [], it is accurate to two decimals.


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Fallen Youth
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PostPosted: Mon 19 Oct, 2009  Reply with quote

the gravitational pull of a planet compared to earth is 3crazy or 3/8 a new moon starts to orbit the other planet making the gravitational pull 5x stronger what is the new ratio? it took me a while to figure that out myself

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Mew151
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PostPosted: Mon 19 Oct, 2009  Reply with quote

Math/Physics Problem... Solve it for cookies.

(Let's just say that 1g = 9.8 m/s^2 instead. That is equal to 9.8 newtons of force per square kilogram. wink5 grin )

You drop a 1000kg object from 1km high. If it were to fall at a steady rate of 9.8 meters per second, how much force will it undergo when it hits the ground?



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tyrael
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PostPosted: Mon 19 Oct, 2009  Reply with quote

lets find the determinant of [A]!! smile
1 3 4
[A]= 2 6 2
5 0 1


Expand row 3!!

3 4 1 3
5 -- 6 2 + 1 -- 2 6

=5[3(2)-6(4)] + 1[1(6)-2(3)]
=5[6-24] + 1[6-6]
=5[-18] + 0
= -90!!!


yayy!!


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Bombax
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PostPosted: Mon 19 Oct, 2009  Reply with quote

Mew151 wrote:
Math/Physics Problem... Solve it for cookies.

(Let's just say that 1g = 9.8 m/s^2 instead. That is equal to 9.8 newtons of force per square kilogram. wink5 grin )

You drop a 1000kg object from 1km high. If it were to fall at a steady rate of 9.8 meters per second, how much force will it undergo when it hits the ground?
It depends on how long the collision lasts. Longer lasting collisions will result in a smaller average force. The impulse, however, can be calculated:

kinetic energy = 0.5 * mass * velocity^2
potential energy = mass * gravitational acceleration * height
kinetic energy = potential energy
0.5 * mass * velocity^2 = mass * gravitational acceleration * height
velocity = sqrt(2 * gravitational acceleration * height)

impulse = difference in momentum
difference in momentum = final momentum - initial momentum = mass * (0 - initial) = mass * sqrt(2 * gravitational acceleration * height) = 1000 * sqrt(2 * 9.8 * 1000) = 140,000 Ns


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RoD
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PostPosted: Mon 19 Oct, 2009  Reply with quote

God, I'm still in Geometry and High school O_o, so I dunno what's going on here ^_^.

Best I know?

3x-2 is parallel to 3x-12 on a grid. :D
-1/3x + 17 is perpendicular to 3/1x + 1,000 on a grid. (I think anyways, still a freshmen in high school tounge2)


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PostPosted: Mon 19 Oct, 2009  Reply with quote

<.< >.>

I don't know much either.
Except the Infinity - Infinity isn't indeterminate. It's 0. smile



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Fallen Youth
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PostPosted: Tue 20 Oct, 2009  Reply with quote

how long is the piece of string -------------------------------------------

A: since you dont know the exact length its the amount it takes for the right side to get to the left side(vice versa)multiplied by two, right?


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Mew151
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PostPosted: Tue 20 Oct, 2009  Reply with quote

Scarface wrote:
how long is the piece of string -------------------------------------------

342 Pixels? grin



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Fallen Youth
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PostPosted: Tue 20 Oct, 2009  Reply with quote

Mew151 wrote:
Scarface wrote:
how long is the piece of string -------------------------------------------

342 Pixels? grin

haha lol no its just an example


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Phi_guy
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PostPosted: Tue 20 Oct, 2009  Reply with quote

Mew151 wrote:

Except the Infinity - Infinity isn't indeterminate. It's 0. smile

Explain.


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Mew151
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PostPosted: Tue 20 Oct, 2009  Reply with quote

Hmmm...

Well, Infinity, subtracted by itself, should be zero.

Because even though it is unlimited, no further numbers exist.
So even though Infinity + 5 = Infinity, Infinity = Infinity, never something greater, because nothing greater exists. So just treat Infinity like a number.
So Infinity - Infinity = 0. grin
If it is true, Infinity - Infinity - Infinity = -Infinity, because 0 - Infinity = -Infinity.



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Bombax
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PostPosted: Tue 20 Oct, 2009  Reply with quote

Mew151 wrote:
Hmmm...

Well, Infinity, subtracted by itself, should be zero.

Because even though it is unlimited, no further numbers exist.
So even though Infinity + 5 = Infinity, Infinity = Infinity, never something greater, because nothing greater exists. So just treat Infinity like a number.
So Infinity - Infinity = 0. grin
If it is true, Infinity - Infinity - Infinity = -Infinity, because 0 - Infinity = -Infinity.
There is no number such as infinity. And even it there were, it would not hold under arithmetic axioms.

I'll have to repeat: There is no "infinity" number.


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