Recent content by jKotha

Homework Statement How would you prepare a 500 ml lab stock of 20% (w/v) SDS That is all that is stated in the problem. Homework Equations I'm assuming for w/v the volume would be 0.5L but the weight I'm not sure. The Attempt at a Solution 0.5L x .20 = .1g SDS / .5 L .. is...

Please look at the attached Microsoft word document because I don't know how to write out everything in this template. I need help with algebra, thanks!

Nevermind.. I"m stupid.. I figured it out. Thanks man.

yes.. 4E/R - 9I3/2 = I3 x 2 8E/2R - 9I3 = 2I3

I multiplied both sides of the equation by 2.

I don't understand.. How did I do 2 things? If I'm left with 8E/2R = 11(I3), then finding I3 would be dividing both sides by 11, which would not give me the correct answer. Also, that doesn't explain where she got the 2I3/2 on the right side. Thats what I'm concerned about. Still...

Hey guys, I'm having a little trouble with some basic algebra. I'm working on solving for currents using kirchhoffs rule. 4E/R - 9I3/2 = I3 Trying to solve for I3... I should get: 8E/2R -9I3 = 2(I3).. and then 8E/2R = 11(I3).. and then I3= 4E/11R However I am looking at my teachers...

where did the 4.9 come from? nevermind.. figured that out.. THANKS!>. i feel really dumb now because i should have known that.. sometimes i complicate myself too much.

hey hey.. I need help again. I can't believe I've forgotten my simple algebra. Anyway.. is there a way to solve the following without using the quadratic equation? 0 = (22)t + 1/2(-9.8)t^2 I'm tryin to isolate t, so i can solve for time. I know you can factor it out as...

Doc, you are a genius. One of a kind. Thank you.. i really appreciate it. I should have already known that.

but wouldn't that take away the dtruck that i want? (dtruck)(88km/hr) - (dtruck)(75km/hr) wouldn't that take away the dtruck?.. and just leave 10km/hr. That can't be right.

thanks.. but still not totally getting it don't think. If i do that.. I get this right? (dtruck)(88km/hr) = (dtruck + 110m)(75km/hr) (dtruck)(88km/hr) = (dtruck)(75km/hr) + (110m)(75km/hr) Now I'm stuck again.. i feel stupid. I know I should be able to islolate dtruck, but how.

Hey guys, I'm having an algebra blank, can't figure this out for some reason, I know it simple. aHH!. Ok.. here's the question. I'm trying to isolate d truck, ie, trying to solve for dtruck from the following. Dtruck = Dtruck + 100m 75km/hr...

I Got It! Hey, thanks. YOU ARE THE MAN. I can't believe I forgot about those.

Ok, I am having some trouble with this problem: How much energy does it take to convert .500 kg ice at -20C to steam at 250 C? Specific heat capacities: ice: 2.1 j/g C, liquid: 4.2 j/g C, steam: 2.0 j/g C. Hvap = 40.7 kj/mol, and Hfus = 6.02 Kj/mol. What I have done so far is use q=mst...