# Recent content by eczeno

maybe xzibit can help.
2. ### Collision Problem - A gain of kinetic energy?

well, we seem to have an impossible situation here. and in fact we do. if you look at the change in KE of B, it is bigger than the whole of A's KE coming in. this is impossible. these numbers do not correspond to a possible physical situation.
3. ### Is there a physical reason why conservation of momentum HAS to happen?

according to the internet, chuck norris seems to have something to do with it.
4. ### Collision Problem - A gain of kinetic energy?

can you show us the work you did.
5. ### How to graph magnetic field between two wires?

hmm, that doesn't look right. one thing is my fault, you need to change your units from mT to microT. but the graph itself looks wrong too. it should be symmetric and it should have a minimum at the center. make sure you are adding the fields from the two wires together.
6. ### How to graph magnetic field between two wires?

sorry, hard to tell, so i just guess. anyway, we are on the right track, have you calculated the field anywhere else?
7. ### How to graph magnetic field between two wires?

ideas, he quoted all the information needed in the above post. any perpendicular line between infinite wires will result in the same graph.
8. ### Egg drop project

get 10,000 straws and 100m of tape and then start building and dropping. use your intuition to get started, but test, test some more, and then do some more tests; you get the idea :smile:.
9. ### How to graph magnetic field between two wires?

yes, you have the idea, now you just need to calculate the field at a few more points and get the shape of the graph. you should try to take advantage of the symmetry of the situation. notice the field in the middle is 45 microtesla, so you need to adjust your scale. oops, i just noticed i...
10. ### How to graph magnetic field between two wires?

oh, ok, then we can solve the problem. do you know how to calculate the magnetic field due to a current carrying wire?
11. ### How to graph magnetic field between two wires?

it seems like we need to know if the currents are in the same direction or in opposite directions. does the problem say anything like that?
12. ### How to graph magnetic field between two wires?

ok, that is good. that is all you can do until you figure out the currents in the wires. do you know how to do that?
13. ### How to graph magnetic field between two wires?

no, all of our action will take place between the wires. you need to make the position of wire 1 = 0cm, and the position of wire 2 = 6cm, and then fill in the rest. the field we are given is for the point located 2cm from wire one, so that is where we plot the value 8.
14. ### How to graph magnetic field between two wires?

ok, that should work, though you may need to consider negative B values. Now, we need to partition our axes and give them some units. we can use the one data point that we know already, (2 , 8x10^-6), to help us determine the scale we should use for each axis. the x-axis is easy, just put a...
15. ### Physics Project Help

if you are thinking about the efficiency of the machine, you don't really want to think in terms of initial vs final energy, but rather energy in and energy out. what do you have to put into the thing, this is basically the cost of lifting the bricks, vs the desired output, which is the KE of...