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Old 02-18-2010, 09:24 PM #1114
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yeah lol fortunado is the one that gets all drunk and what not and the other guy (can't remember his name) brings him down into a crypt and buries him alive by putting up bricks while fortunado just stands there loling
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Old 02-18-2010, 09:27 PM #1115
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Solve the Taylor Series for y=cosx at a=4 with degree 5.
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Old 02-19-2010, 11:33 AM #1116
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In problems dealing with a pulley with a nonzero moment of inertia, the magnitude of the tensions in the ropes hanging on either side of the pulley are not equal. The difference in the tension is due to the static frictional force between the rope and the pulley; however, the static frictional force cannot be made arbitrarily large. Consider a massless rope wrapped partly around a cylinder through an angle Δθ (measured in radians). It can be shown that if the tension on one side of the pulley is T, while the tension on the other side is T' (T' > T), the maximum value of T' that can be maintained without the rope slipping is T'max =
TeμsΔθ
, where μs is the coefficient of static friction. Consider the Atwood's machine below: the pulley has a radius R = 0.17 m, the moment of inertia is I = 0.39 kg · m2, and the coefficient of static friction between the wheel and the string is μs = 0.31.
(a) If the tension on one side of the pulley is 11 N, what is the maximum tension on the other side that will prevent the rope from slipping on the pulley?
____N

(b) What is the acceleration of the blocks in this case?
_____m/s2

(c) If the mass of one of the hanging blocks is 1.1 kg, what is the maximum mass of the other block if, after the blocks are released, the pulley is to rotate without slipping?
____kg

Halp please
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Old 02-22-2010, 01:40 AM #1117
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Old 02-24-2010, 01:20 PM #1118
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can someone please help i am dying here
calculus AB:
separable differential equations

dy/dx = ((3x^2)+2) / y

please help and if you could post an over view of your work that would be great
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Old 02-24-2010, 02:30 PM #1119
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Quote:
Originally Posted by clumsy View Post
can someone please help i am dying here
calculus AB:
separable differential equations

dy/dx = ((3x^2)+2) / y

please help and if you could post an over view of your work that would be great
Just get the y terms on the side with dy, and the x terms on the side wth dx.

y*dy = ((3x^2)+2)*dx

Now integrate both sides, I'm assuming you know how to do this, they are both very basic integrations. Don't forget integration constants.
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Old 02-24-2010, 03:58 PM #1120
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Quote:
Originally Posted by -PaRaDoX- View Post
Just get the y terms on the side with dy, and the x terms on the side wth dx.

y*dy = ((3x^2)+2)*dx

Now integrate both sides, I'm assuming you know how to do this, they are both very basic integrations. Don't forget integration constants.
thanks man for some reason i want to do the derivative of both sides... i kinda feel dumb for asking that
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Old 02-25-2010, 03:25 PM #1121
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That one was a blast from the past, i used to love derivatives.
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Old 02-25-2010, 04:20 PM #1122
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A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 12 m/s, skates by with the puck. After 3.0 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 4.0 m/s2, determine each of the following.


(a) How long does it take him to catch his opponent? (Assume the player with the puck remains in motion at constant speed.)

Son of a *****, I guessed around 9 and it appears I'm quite close, but I have no idea how to do it really. Since the final x position is the same, I believe I can set them equal to each other. I'm using this equation.

X - Xo = Vot + .5at^2

And I end up getting 1/2a^2=36+Vf(final velocity of opponent)(time)
But then I don't understand what I put in for acceleration, the 4m/s^2?
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Old 02-25-2010, 04:49 PM #1123
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12(t+3) = .5(4)t^2

The guy with the puck goes for three 3 more seconds, hence the 12(t+3). Acceleration is 4. The opponent's V0 is 0, so you can just drop that part.

You get t = 8.19615 seconds
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Old 02-25-2010, 08:00 PM #1124
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Ugh, I didn't think of adding the 3, that's way simpler than I was making it.

Thanks.
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Old 03-01-2010, 05:50 PM #1125
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i have a calc question.

I need to derive this equation:

(x^3)/(6-x^2)

I keep getting [x^2(15+2x^2)]/(6-x^2)^2

but the right answer is:

[x^2(18-x^2)]/(6-x^2)^2


Edit:
nevermind I got it haha
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Old 03-02-2010, 07:45 PM #1126
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My gf needs help with her math homework, and I'm terrible with matracies.

Write the linear system as a matrix equation.
x+4y=3 and 2x-3y=1


I dont remember if you go X='s and Y='s or what
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Old 03-03-2010, 08:30 AM #1127
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i think it goes X then y

and i think C = the other number which is supposed to be on the same side as the variables.
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Old 03-03-2010, 05:30 PM #1128
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Quote:
Originally Posted by Clint Eastwood View Post
A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 12 m/s, skates by with the puck. After 3.0 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 4.0 m/s2, determine each of the following.


(a) How long does it take him to catch his opponent? (Assume the player with the puck remains in motion at constant speed.)

Son of a *****, I guessed around 9 and it appears I'm quite close, but I have no idea how to do it really. Since the final x position is the same, I believe I can set them equal to each other. I'm using this equation.

X - Xo = Vot + .5at^2

And I end up getting 1/2a^2=36+Vf(final velocity of opponent)(time)
But then I don't understand what I put in for acceleration, the 4m/s^2?
A. Xo=0 V1o=0 so that leaves X=(1/2)at1^2

X=V2xt1

t2=sqrt( (2(v2t1))/a)

t2=4.24s
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Old 03-03-2010, 09:21 PM #1129
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establish the identity:

(csc(x)-1)/(csc(x)+1)=(1-sin(x))/(1+sin(x))
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Old 03-03-2010, 10:21 PM #1130
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Quote:
Originally Posted by _WARRIOR_ View Post
establish the identity:

(csc(x)-1)/(csc(x)+1)=(1-sin(x))/(1+sin(x))
just sub in 1/sinx for the cscx terms, make common demonimators on both sides of the compound fraction then cancel the denominators of both. magic.
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Old 03-04-2010, 04:33 PM #1131
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Can anybody help me with my english project?

I need to write a thesis statement about The Scarlet Letter, my teacher told us how to do it in class but i forgot my binder that i wrote it down on in my locker.
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Old 03-04-2010, 09:11 PM #1132
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I have this question for homework and I have no idea how to do it. We need to find the population standard deviation and the sample standard deviation.

The values for (xi) are 3/6/7/8/5,
and the (fi) frequency is 4/3/1/1/3. Can you help? Thanks!
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Old 03-06-2010, 10:02 AM #1133
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Guys I am doing some extra credit in my oceanography class and the subject is the physics of tides. I've explained what causes tides and tidal force, but I'm not sure what more I could cover to fully explain the physics of tides.

Any help?
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Old 03-08-2010, 09:08 AM #1134
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If you are looking for more content, maybe you could type in the importance of tides and myths about how tides occur...
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