# Search results

1. ### Spring System with Variable Tensions, functions of displacement.

each mass has a spring sticking straight out of it. I guess a better way to describe it would be the following.. 2 masses with springs are attached in the followin order. mass1_spring1_spring2_mass2 the masses have some initial velocity toward eachother
2. ### Spring System with Variable Tensions, functions of displacement.

woops. I meant... F(at B)= 0 = K1(X1)*X1 - K2(X2)*X2
3. ### Spring System with Variable Tensions, functions of displacement.

So...I wanna solve the problem where two masses on springs collide into eachother on a frictionless surface. The two masses are different, and both springs' tensions are linear functions of x. The two mass-springs collide into eachother, each having some initial speed V1 and V2,and the...
4. ### Any physics students from Berkeley or UCLA here?

Wow that's exactly the the kind of information I was looking for. Exactly like you, I'm coming from a community college. It's good to hear that you're experience has been positive there. Your story is kindof funny because it's similar to mine. At my community college there's a couple of...
5. ### Any physics students from Berkeley or UCLA here?

I got accepted to UC Berkeley and Los Angeles. I would like to know what being a physics student at these 2 schools is like. Were the professors enthusiastic? In general, were the students in this major helpful to eachother? How about the availability of the professors and/or someone else from...
6. ### Cause of this diffraction?

Well, if the orientation of the "streamers" is always the same with respect to your head, then they're probably being caused by some filtering (or polarizing?) around your eyes. My best guess is your eyelashes are the cause. Even though you tried to cover them up, light is ligh,t and it will...
7. ### Electromagnetic induction and Faraday's Law

Ok, so that diagram represents what I was saying perfectly. If you pretend you are the small face of the magnet (on the north side) that is entering the coil as you enter the coil, you will see the current moving counterclockwise as you enter the loop. Looking at the coil from the top (as...
8. ### Electromagnetic induction and Faraday's Law

If you look at wire coil down it's central axis (so that coil looks like a single ring) then shove a magnet in this hole, the current induced in the coil will go counterclockwise. If you hold a wire with your right thumb lying along the wire in the direction of current and wrap your fingers...
9. ### Angular Velocity of Bullets

Does anyone know where I can find a list of angular velocities of different kinds of bullets fired from different kinds of guns?
10. ### Heat Transfer problem need help !

I remember the the equation for a problem like this was something like.. power = [(area)(change in temp)]/[sumation of (length/conductivity)] , where the lengths are the thickness of each individual layer, and then the "conductivity" is the conductivity of that particular layer. sorry, I'm...
11. ### Mass of air leaving a room with temp raised.

Yo, that looks good to me.

13. ### Problems Involving Integration Please

Hi, I'm taking my second semester of physics right now. I do a lot of practice problems from my book and am able to complete the problems marked "difficult" without much trouble. Even though these problems are a little more challenging, they hardly ever employ the use of calculus (integration)...
14. ### Tougher than it looks

how did you do it?
15. ### Tougher than it looks

Were you able to solve this? I tried solving it but I can't. I set up a few relationships, but I think this problem requires some calculus and I'm really weak with that. Can someone help further please?
16. ### Matrix of a Parabola? (It's my first day)

HallsofIvy, I do see and understand that, although I'm having trouble understanding why or how that answers the question in the second phrase. Could you explain to me what the second phrase is asking me to do? Sorry for all the questions. This whole thing is totally new to me.
17. ### Matrix of a Parabola? (It's my first day)

Hi guys, I started linear algebra just yesturday. I've read the first section of the first chapter and now I'm trying to do some problems from this section and I'm stuck on #7. I scanned the page from my math book (here's a link: http://img392.imageshack.us/img392/8476/lach11n72fb.jpg [Broken])...
18. ### Uniform Hoop Hit By a Small Sticky Ball of Putty

Thanks I understand it now.
19. ### Uniform Hoop Hit By a Small Sticky Ball of Putty

Why is the torque about the pivot pointzero after the impact? Before the impact, gravity causes no torque because it acts through the center of mass of the hoop, and the line of acting of gravity passes through the pivot point (thus, no torque). When the putty immediately sicks to hoop, doesn't...
20. ### Uniform Hoop Hit By a Small Sticky Ball of Putty

here's a link to the image. By vertical loop, I mean the hoop is able to complete a revolotion around it's pivot point (as if you pushed the hoola hoop hanging from your finger so that it went all the way around). The faded loops just demonstrate the motion that the second part of the question...
21. ### Uniform Hoop Hit By a Small Sticky Ball of Putty

I had this question on my physics final this summer and I can't figure out the answer. A uniform hoop of mass M and radius R is hanging from a frictionless pivot point. A sticky putty ball is thrown horizontally at the hoop with linear momentum "mVo", where m is the mass of the putty and "Vo" is...
22. ### 2 balls involved in 1-D Elastic Collision

Thanks a lot for the assistance you guys. this has abeen huge help :)
23. ### 2 balls involved in 1-D Elastic Collision

A ball of mass 0.200 kg has a velocity of 1.50i m/s; a ball of mass 0.300 kg has a velocity of -0.400i m/s (where "i" is supposed to be that unit vector along x-axis). They meet in a head-on elastic collision. (a) Find their velocities after the collision. I know I can use the conservation of...
24. ### Acceleration Caused by some Forces on a Cart, Help Please

Thanks, that helped a lot. I now understand 2 of the 3 equations. I worked out the 2nd one and the 3rd one by myself, but now I'm a bit confused as to how the acceleration "a" of the 2 masses connected by the string is related to the acceleration "A" of the entire cart M. This is my thought...
25. ### Acceleration Caused by some Forces on a Cart, Help Please

The process of identifying the forces and accelerations is where I'm having the most trouble. this is where I need help. More specifically, I dont understand how the acceleration of the cart M arises. If it moves to the left, there must be a force going to the left, right? When I look at the...
26. ### Acceleration Caused by some Forces on a Cart, Help Please

This is my first physics class and I'm looking to do more than just pass it, I want to understand everything fully. Anyway, my class just started going over Newtons first, second and third laws, and I'm having trouble with a problem in my book (this problem...