Discovery Homework Help Kiosk!

[Zig]

The frequency of something is the number of cycles per second. The period is the number of seconds per cycle.

In this case, there are 0.05 cycles per second. Multiplying by one hundred, we get five cycles in 100 seconds, or one cycle in 20 seconds.

Thus, the period of this ride is 20s.

(Crappy explanation, I know)

f (in hertz) = 1/T (in seconds), so T= 1/F. 1/0.05 is 20s.

It's just that easy. D:

Boss, remember that Dilbert comic from way back when in which a new project name is being brainstormed, and terms from both astronomy and physics are to be used?

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Luls:

Role-play is not the be all and end all.

[Feldspar]

okay, I need to understand how to use the combined and idea gas laws for my chemmistry class. I have almost no idea how these work... all I need to know, is what are these formulas and how do I use them?

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[Feldspar]

also on a seprate note... I need help using sin and cosin to find angle and side mesurments in geometry, i need to understand how to use them

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[mwerte]

As pressure rises, temperature also rises and volume decreases.

That kind of stuff? (that's about all I remember of chemistry gas laws... :S)

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[Feldspar]

yeah... somthing to do with that

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[Skoorb]

As far as i can remember the only real equation for the gas laws is

PV=nRT

P= Pressure
V= Volume
n= number of moles
R= Gas constant = 0.0821 (L*atm)/(mol*K) or 8.314 J/(mol*K)
T= Temperature in Kelvin

You use this formula if you are given 3 out of the 4 variables and asked to find the 4th.

If you have a before and after question, as in if temperature changes what happens to the pressure at constant volume you use

(P1*V1)/T1 = (P2*V2)/T2

1 means before and 2 means after so P1 is pressure before and P2 is pressure after
*** This is essentially the first equation in a before and after form minus the n and R variables since they remain constant. ***

Anything that stays constant you remove from the equations, in this example you would remove volume so you get
P1/T1 = P2/T2
P2=(P1*T2)/T1

So the conclusion you draw is that if temperature goes up (T2>T1 and therefor T2/T1 > 1), Pressure (P2) will also go up and vice versa (when T2<T1, T2/T1 < 1, P2 would be less than P1) .

I think that is really all you need to know for an intro chem class.

Hope this helped and good luck.

[hribek]

See also: http://en.wikipedia.org/wiki/Ideal_gas

As for sine and cosine - trigonometric functions - (since you need to understand basic concepts): http://en.wikipedia.org/wiki/Trigonometry

If you have any complex problems which aren't covered in that, dump them in here.

[Feldspar]

okay thanks for the information! :)

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[Feldspar]

a toy balloon has an internal pressure of 1.05 atm, and a volume of 5.00 L. if the temperature where the balloon is released is 20 'C what will happen to the volume when the balloon rises to an altitude where the pressure is .650 atm and the temerature is -15'C?

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[pragun]

Using the formula (P1*V1)/T1 = (P2*V2)/T2

And using the values ->

P1 = 1.05 atm
V1 = 5 L
T1 = 293 K

P2 = 0.65 atm
T2 = 258 K

You can evaluate the equation, which finally yields V2 = 5.3 L, which is the answer.:)

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Retired