Recent content by kk727

So my teacher said that the KH2PO4 would be considered the acid, and that the K2HPO4 would form a strong conjugate base. I converted from grams to mols, and then to molarity. Using the given Ka value of 6.2 x 10^-8, I just plugged everything into the Henderson-Hasselbalch equation and got a pH...

Thank you! I realized I had my signs all wrong...stupid mistake! I figured it out and got the right answer!

Homework Statement Ball 1: 3kg, 7 m/s initially Ball 2: 4kg, V m/s initially Ball 3: 5kg, 10 m/s initially Find V if the system collides inelastically and moves off at 2 m/s at 5 degrees above the horizontal. Homework Equations p + p = p + p (in both x and y directions) The...

Homework Statement Calculate the pH of a buffer made with 10.0 g of K2HPO4 and 5.0 g of KH2PO4 in 1.0L of water. Homework Equations -log Ka + log (base/acid) = pH The Attempt at a Solution So...mathwise, I know how to do this problem. My only question is, aren't K2HPO4 and KH2PO4...

I just realized that the worksheet has two problems that are #37... -_- So I'm doubting that -1 m/s is the answer to this one. I'm still confused with trying to solve it, though!

Homework Statement I was given this worksheet today: http://www.mrwaynesclass.com/impulse/WS/momentum.pdf However, I was not in school today nor when we started momentum. So I'm a little confused with the graphs. On a force versus time graph, how do you go about solving for velocity? An...

My teacher uses this website a lot - not sure if it's exactly what you're looking for, but I find it useful! http://www.chemmybear.com/groves/apchem.html

I'm amazed that you're so motivated and have such opportunities! I'm a senior in high school now and not a single person I know is doing anything similar to what you're doing. How did you go about finding such programs? I'm amazed!

Yeah, I talked to some of my teachers and they said it would be a waste, too. They said that having dual degrees won't really make a difference. I'm kind of leaning towards the 5 year Master's program...it just seems so much more reasonable than trying to do it all in only 4 years.

As an incoming college freshman in the Fall of 2011, I've been given various options and various paths to take. I'll be attending Stevens Institute of Technology in Hoboken, NJ. My first option is a Scholars Program, which offers me two unique choices: a 4-year Masters/Bachelors Program, and...

Nevermind, I pretty much understand it! Doing similar problems just helped everything connect in my head! Thank you for all of your explanations though, it helped me so much!

Thank you so much! That's exactly what I needed. Sometimes seeing the solution is enough to help me figure something out, but this wasn't the case. I think I understand what you're saying. I forgot that you would use the center of mass - for some reason I was looking at the length. That's why...

Homework Statement This is a question from the 1999 AP Physics C test. You can view the picture here, on Page 6: http://vhphysics.com/ap/x-test-q/Resource/b)%20Physics%20C%20Materials%20(656)/c)%20AP%20C%20Free-Response%20Problems%20(213)/Physics%20C%201999%20Free%20Response.PDF As...

Hahaha, okay, it totally confused me and made me doubt everything that I did...thanks for the verification! :)

Homework Statement The flywheel of an engine has a moment of inertia 2.50 (kg)m^2 about its rotation axis. What constant torque is required to bring it up to an angular speed of 400 rev/min in a time of 8.00s, starting from rest?Time (t) =8.00 sec Ang Velocity (W) = 400 rev/min Moment of...