Nick Against the World (75 Viewers)

GordoDeCentral

Diez
Moderator
Apr 14, 2005
70,934
IncuboRossonero said:
NO retard..it means I knew someone who gave me passes to opening night where ticket buying individuals cannot attend....
not the first screening but opening night....the movie opens today I viewed it Wednesday...

my bad, no need to get offended i always confuse warsies and trekkies
 

JCK

Biased
JCK
May 11, 2004
125,413
Andy said:
Is anybody here familiar with finding the capacitance of parallel-plate capacitors?

Piss easy






k = relative permittivity of the dielectric material between the plates.

d is the distance between the plates

and A is the area of the plate.
 

Bjerknes

"Top Economist"
Mar 16, 2004
116,528
Jeeks said:
Piss easy






k = relative permittivity of the dielectric material between the plates.

d is the distance between the plates

and A is the area of the plate.
I know all the formulae etc, however for some reason I cannot figure out this problem... perhaps its just the way the question is worded:

Figure 25-42 shows a parallel-plate capacitor with a plate area A = 5.76 cm2 and a plate separation d = 5.76 mm. The left half of the gap is filled with material of dielectric constant κ1 = 9.00; the right half is filled with material of dielectric constant κ2 = 10.0. What is the capacitance?


I used this but Webassign keeps saying my answer is wrong.

C(left)=k(left)*(epsilon naught)*(Half the area of the plate) / (plate separation)
C(right)=k(right)*(epsilon naught)*(Half the area of the plate) / (plate separation)
C(total)=C(left)+C(right)
 

JCK

Biased
JCK
May 11, 2004
125,413
Andy said:
I know all the formulae etc, however for some reason I cannot figure out this problem... perhaps its just the way the question is worded:

Figure 25-42 shows a parallel-plate capacitor with a plate area A = 5.76 cm2 and a plate separation d = 5.76 mm. The left half of the gap is filled with material of dielectric constant κ1 = 9.00; the right half is filled with material of dielectric constant κ2 = 10.0. What is the capacitance?


I used this but Webassign keeps saying my answer is wrong.

C(left)=k(left)*(epsilon naught)*(Half the area of the plate) / (plate separation)
C(right)=k(right)*(epsilon naught)*(Half the area of the plate) / (plate separation)
C(total)=C(left)+C(right)
That is correct, but I have to point out something for you, make sure all your units are the same. I see the area is given in cm2 and the seperation is in mm and usually the konstant is in F/m. These are three different units that need to be normalized to one.
 

Bjerknes

"Top Economist"
Mar 16, 2004
116,528
Jeeks said:
That is correct, but I have to point out something for you, make sure all your units are the same. I see the area is given in cm2 and the seperation is in mm and usually the konstant is in F/m. These are three different units that need to be normalized to one.
Indeed Jack all need to be in meters which are all easy conversions. That's why I'm not sure what I'm doing wrong because all the steps I have taken are correct.

Physics and calculus homework that need to be submitted online is utter bullshit... even if you mess up the sig figs you still get the answer completely wrong.

But I'll work it out again... thanks Jack.
 

Bjerknes

"Top Economist"
Mar 16, 2004
116,528
Jeeks said:
Physics homework submitted online? This is the silliest thing I've ever heard.
If you think physics homework submitted online is silly, just think about dealing with trig subsitution in calculus and having to enter all sorts of different configuration to obtain the points. Makes you want to pull your hair out.
 

Bjerknes

"Top Economist"
Mar 16, 2004
116,528
Jeeks said:
Naah, calculus is the coolest thing ever.
Right now we're doing techniques of integration, specifically trig substitution and integration by parts. It's not all that bad, however sometimes it's tricky submitting the answers online because you have to enter it exactly to their standards. So if your answer appears to be correct when you preview it, you still might not have it correct because you misplaced parenthesis.

I have my first midterm on Monday and that's why I'm not doing much partying this weekend. Next we have to do sequences and I'm not sure how well that will go.

And I don't agree with calculus being the coolest thing ever. The coolest thing ever would be people handing me millions of dollars to do nothing but watch soccer games, eat General Tso's and drink Patron every night.
 

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