Recent content by grouchy

Homework Statement For the RC Circuit (R = 1M Ohm, C = 1 Micro Farad and E = 30 V) find the potential difference across the resistor 10 sec after the switch is closed. Homework Equations V = E (1 - e^ -t/RC) The Attempt at a Solution I use the above equation but I get it wrong...

I found my mistake, I used the equation for conducting sheet of charge E = d/ϵ but the problem says non conducting which is E = d/2ϵ which tells me its right when I multiply by 2 :)

Homework Statement an electron with mass m = 9.11 x 10^-31 is released at rest near a very large positively charged non-conducting charged sheet lying horizontally. What should the surface charge density on this sheet be to keep the electron balanced at rest above the ground? Is it above or...

humm...I get 1/2ln(x^2 + 4) - 2arctan(x/2) can someone double check for me? I'm pretty sure its right

I'm stuck on a calculus problem. The intagral (from 0 to 2) of (x-4)/(x^2+4) I figure you can split it as x/(x^2+4) - 4/(x^2+4) but I have no idea what to do after.

UPDATE: Ok, I think my addHead and removeHead methods work as intended. They seem to add and remove (thx for pointing out that tail would remain in the end). Only problem I'm having now is addTail. it always seems to add to the head. Here is the code. public void addHead(Object newData) {...

ok, i think I know what you mean. Also, about the tail pointer, I am supposed to have it reference my last object on the stack. I tried to change somethings around to make more sense. The problem, for example if I addHead A, then B, then C, then D. When I go to remove,the first time it...

Hi, i need to use a list class (provided and complete) and then use a Linkedlist class (need to add the methods) to get a stack going. I am having trouble with my remove from head method although I ain't too sure if my addHead method is right... I'd appreciate it if someone could look over my...

eh.. thanks lol! Need to pay attention in class a bit more :)

wait..is the answer zero?

Hint: Use shell theorem and/or flux argument for a symmetrical shell. A thin spherical shell has a radius of 3.4 m and a mass of 456 kg. The Universal gravitational constant is 6.6726 x 10^-11 N m^2/kg^2. What is the gravitational field 1.4 m from the center of the shell? Answers in units of...

i dunno, I'm thinking about it and I just don't get this one

for m2, would the weight W, be equal to 2T? also I think a1 = a2

For the system in the figure mass m1 is 10 kg and mass m2 is 5 kg. What is acceleration of m1 if the horizontal surface is frictionless? Hint: How does a1 compare to a2? http://geocities.com/grouchy187/untitled.bmp My attemp: T = m1a T - m2g = m2a m1a = m2g + m2a a= m2g / m1-m2

GOT it, I kept assuming that I need to use the potential of the spring. All i need was.. 1/2mv^2 = k(coefficient of kinetic friction)Nd v = square root of (2kNd/m) = 3.07 m/s matches up perfect Also, I used the 1.2 m for d. thx.