# Search results

1. ### The Hall Effect

If I move a strip of copper mechanically with my hand through a uniform magnetic field will their be a drift velocity? And if so will the drift velocity be in the same direction as the moving copper strip? What would the magnitude of the drift velocity be if this happens? Can you have a drift...
2. ### Capacitors, Electric Fields, and Dielectrics

I have a question that is confusing me perhaps one of you can help me. If I hook up a constant potential difference to a capacitor and place a dielectric inside of it, will the electric field decrease even if the plate separation remains constant? I think that the capacitance will increase as...
3. ### Calc 3 homework problem need help!

Hello guys I am not sure if I am doing this right. If you could offer any advice or point out my mistakes I would appreciate it. Problem: Sketch the graph of the domain of f(x,y,z) = \frac{1}{x^2+y^2-z} Domain: (x,y,z) \in R^3 \mid x^2+y^2 does not equal z Graph: I set f(x,y,z) = 1 and...
4. ### Level Curves: Homework, need help!

I am trying to find and graph the level curve f(x,y)=\sqrt{x^2-1} that passes throught the point (0,1), as well as its domain and range. I am not sure if my reasoning is right, so let me know if I got the wrong idea. For the graph I have x = 1 which is independent of y and is just a...
5. ### 2 Homework Problems

Infinite Series Calculus 2 hw problem Hello. I need help finding the answer on two of these. #1. Find a power series representation for f(x)=ln(1+x^2) I have f'(x)=\frac{(2x)}{(1+x^2)} So I factor out 2x and have \frac{1}{(1+x^2)} which is a geometric series = \sum(-1)^{n}x^{2n} then...
6. ### Area Between Curves

Hey guys, I am curious if I am setting this up right. Could you take a look and make sure I am on the right path? I have three questions. 1) I am trying to find the area bound by y=x^2 and y=4x+5 Upper function y=4x+5 Lower function y=x^2 For my integral I have \int^{5}_{-1}4x-5-x^2...
7. ### Test Question (Potential Energy): Need help finding answer

I can't figure out what I did wrong on this test question. A 4kg block is dropped from a height of 0.8m above a spring, k=120N/m. Find the maximum compression of the spring. I have the PE at the top is equal to KE at the bottom. PEtop=31.4J KEbottom=31.4J The potential energy in the...
8. ### Uniform Circular Motion Confusion

I have a question about uniform circular motion that is just confusing me. Maybe one of you can elucidate it for me. Say I am in a roller coaster car and I am travelling in a loop. At the top of the loop if my velocity is not great enough I should fall out of the loop but because the car is...
9. ### Orthogonal Curves

How do I prove that two curves are orthogonal when they interest each other at a specific point? Do I just take the derivative of both and compare the slopes? The slopes should be negative reciprocals of each other, correct?
10. ### Chemical Reaction, need help!

Hey guys could you tell me if I got the right answer; my teacher hasn't went over this material and it is due tomorrow. Given the following reaction, how many grams of Zn are required to obtain 2.00g of Au? 4CN^{-1}~+~3Zn~+~2Au(CN)_4^{-1}~~-->~3Zn(CN)_4^{-2}~+~2Au (2.00g of Au)(1 mole...
11. ### Chemistry help

Hey could you guys tell me whether I am on the right track with this or not. First Problem: A tablespoon of sugar, C_1_2H_2_2O_1_1, weighs 2.85g. molar mass of sugar = 352g molar mass of oxygen = 16g A.) How many moles of sugar are there in a tablespoon? (2.85g of sugar/1)(1...
12. ### Stoichiometry Help

Hey could you guys tell me whether I am on the right track with this or not. First Problem: A tablespoon of sugar, C_1_2H_2_2O_1_1, weighs 2.85g. A.) How many moles of sugar are there in a tablespoon? Do I calculate the molar mass of sugar in grams and then divide 2.85g by the molar...
13. ### Need Vector Help

Hey guys, I need your help figuring out what I am doing wrong. Two beetles run across flat sand, starting at the same point. Beetle 1 runs 0.5m due east, then 0.80m at 30 degrees north of due east. Beetle 2 also makes two runs; the first is 1.6m at 40 degrees east of due north. What must be...
14. ### Vector Magnitude/Direction Problem

Hey guys I need your help on this one. There is something I am doing wrong on this problem. Can you help me figure out what I am doing wrong? Problem: A golfer takes three putts to get the ball into the hole. The first putt displaces the ball 3.66m north, the second 1.83m southeast, and the...