Solve this problem and i will send 50 bucks paypal to whoever gets it right first.

[bboyrevert]

Answer will be given at the end of the week on friday @10pm Boston time. First person to get it right and SHOW THEIR WORK wins. Ill be doing these for the entire month of June and sometimes the monetary amounts will be different depending on the difficulty of the question. Yes this is real, I recently graduated from MIT and got hired as a chemical engineer for BP, my salary is more money than i could ever spend on my own, so ive decided to spread the love around. Lets start off with an easy question. You only get one try so make it count, one little mistake and that's it.


A cylindrical resistor of radius 6.00nm and length 19.8cm is made of material that has a resistivity of 3.50E-5 ohm meters. What is the current density and the potential difference when the power dissipation is 2W?

 

[The Sach]

I will solve it because I am bored.Zzz
First, let's go step wise:
Given: resistivity=3.5E-05, Radius=6nm, Length, l=9.8cm, Power, P=2W
Solution:
1. Calculation of Area.
Area/Surface area=2*pie*r*h+2*pie*r^2
Putting values of r and h,
we get, surface area=7.6444*10E-9
2. Calculation of Resistance.
Resistance(R)=Resistivity*length/area.
We have all the values, put them and you will get answer as,
R=928.41 ohms.
3. Calculation of Current.
Power=I(square)*R
Using this we will get,
current, I=46.44 mA
4. Calculation of Current density.
Current density=I/A
Putting values of current and area,
we get, Density=6.22*10E6 A/m.
5. Calculation of voltage
Using Ohm's law,
Voltage=Current*Resistance.
Put value of resistance and current and you will get value of voltage,
V= 46.414mA*928.41ohm
V=43.09V.
I am not giving you calculations, just cross-check the answers.Zzz

 

[Oblivionx]

I will solve it because I am bored.Zzz
First, let's go step wise:
Given: resistivity=3.5E-05, Radius=6nm, Length, l=9.8cm, Power, P=2W
Solution:
1. Calculation of Area.
Area/Surface area=2*pie*r*h+2*pie*r^2
Putting values of r and h,
we get, surface area=7.6444*10E-9
2. Calculation of Resistance.
Resistance(R)=Resistivity*length/area.
We have all the values, put them and you will get answer as,
R=928.41 ohms.
3. Calculation of Current.
Power=I(square)*R
Using this we will get,
current, I=46.44 mA
4. Calculation of Current density.
Current density=I/A
Putting values of current and area,
we get, Density=6.22*10E6 A/m.
5. Calculation of voltage
Using Ohm's law,
Voltage=Current*Resistance.
Put value of resistance and current and you will get value of voltage,
V= 46.414mA*928.41ohm
V=43.09V.
I am not giving you calculations, just cross-check the answers.Zzz

well done.... *_* (if calculations are correct)...

 

[The Sach]

well done.... *_* (if calculations are correct)...

I hope they are correct.*_*

 

[bboyrevert]

You are wrong. Double check your work next time.

 

[Aya San]

You just did his homework Lol

 

[The Sach]

You just did his homework Lol

I know, I was just doing it because I was bored.

You are wrong. Double check your work next time.

May I know where I went wrong, if you are serious?O_O

 

[bboyrevert]

read the damn post answers are given out at the end of the week moron. Ifi were to give out the answers no one else would have a chance to get the prize.

 

[The Sach]

^Thank you for 'kind' info.

 

[bboyrevert]

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