Discovery Homework Help Kiosk!

[Dopamino]

Anyone want a free portable copy of Algebrator (http://www.softmath.com)?
If you do, go here. http://yerdenizden.blogspot.com/2008/02/po...brator-401.html

Works great:yes:

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I mostly lurk around Media Center these days.

[ivr56]

So glad I found this thread. May be a grave dig but I need the help and this is the thread for this stuff.
Subject: Physics
Chapter: Resonance and Sound

Heres the question:
String on violin has a fundamental frequency of 196Hz with the vibrating part at 32cm long and a mass of 0.50g. Under what tension must the sting be placed?

Thanks in Advance for any help because right now I'm very lost.

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[Ximen_Benitez]

Holy smokes... i totally forgot about this thread. I'll help people where I can, and I'll post my stupid Pre Calc questions when I need help:P

Yaaaay for homework!

Oh, you may see some nuclear physics stuff too, I guess I'm learning some o that next semester.

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[Captain]

can someone tell me the difference between C6H12O6 and C6H12O6

P.s I know it just wandering if you would know

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[Ximen_Benitez]

One is blue and one is pink?

No seriously.... they're the same...?

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[Dopamino]

You're talking chemical formulas right? In that case they are the exact same if you typed it right.

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I mostly lurk around Media Center these days.

[Captain]

actualy chemicaly speaking they are written the same,
but 1 is alcohol and the other is sugar, molucelar speaking they are different
but still both are C6H12O6

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[Seth Karlo]

Hey guys, found this for the first time. Can someone explain internal resistance t me in the next 20 hours or so? I missed the lesson, don't get it and my exam is tomorrow!:(

Seth

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[skoko]

Umm.. internal resistance? Well.. That is (bad english incoming) electrical value that any battery or power source possess.. Imagine it like small , very small resistor inside battery.

like this ... .


internal resistance is responsible for power drops inside power source... and when you add all EMF-s from any circuit , you will be short for power drop on source (in Kirchhoff's law).. so EVERY battery has internal resistance which is responsible for certain power loss (it small power loss, but it exists) I hope that is internal resistance you were thinking about.

Example : (found on net)


A battery of emf 12 volts and internal resistance 0.5 ohms is connected to a 10 ohm resistor. What is the current and what is the terminal voltage of the battery under load??



Step 2: Work out the total resistance

R tot = R1 + R2 = 10 ohms + 0.5 ohms = 10.5 ohms

Step 3: Now work out the current:

I = V/R = 12 ? 10.5 = 1.14 A
Step 4: work out the voltage across the internal resistor (lost voltage):

v = Ir = 1.14 amps ? 0.5 ohms = 0.57 volts
Step 5: work out the terminal voltage:

Terminal voltage = emf - lost voltage = 12 - 0.57 = 11.43 volts
We can of course work out the terminal voltage by working the voltage across the 10 ohm resistor, assuming there are no losses.

P.S. Well i am rather good with electrical stuff and mathematics (but forgot differential equations of higher orders and similar things) and you can PM me with that kind of problems here on forums , and maybe i can help you !

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[Seth Karlo]

thanks! Exam is in 3 hours... Wish me luck! *is worried*:(

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