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  1. C

    Electric field E= dV/dS

    That the thing I have no idea. All we did was connect a battery and draw on a Electric field mapper. have no idea what the lines mean.
  2. C

    Electric field E= dV/dS

    ty, im going to do it, what is the value if should expect?
  3. C

    Electric field E= dV/dS

    how do i get r? do i measure the lines?
  4. C

    Electric field E= dV/dS

    yes that part of it. My second question is how to i calculate for the value E?
  5. C

    Electric field E= dV/dS

    Homework Statement OK we had a lab and the lab was to draw some dots mapping a electric field. I connected the dots, but i have no idea which way the field points and how to calculate the electric field. I think we need to use E= dV/dS , but i have no idea what dS is. Do i just take the...
  6. C

    Rotational static equilibrium

    ok im no expert but i got the sign to be 30.4 kg. My class is in the same subject right now. so if you know the answer and it is somewhat similar to mines I can tell you how I did it. I don't want to tell you the wrong thing until the answer is confirmed.
  7. C

    Equilibrium problem

    FxsinθL - WcosθL / sin θL = Tension edit: FxsinθL - WsinθL / sin θL = Tension then it will simplfy as , T = Fx-W = Tension... now it doesn't even seem right
  8. C

    Equilibrium problem

    Homework Statement http://img820.imageshack.us/img820/3505/23625990.jpg [Broken] Two uniform beams, each of mass M and length L, are connected by a hinge at the top and by a chain of negligible mass attached between their centers. The system will stand upright on a frictionless surface as...
  9. C

    Represent (1+x)/(1-x) as a power series.

    alright, thanks a lot guys. I'm going to practice some more.
  10. C

    Represent (1+x)/(1-x) as a power series.

    ohh i see it now, thanks you. My class just started this section and I'm kinda new to this. Is there a shortcut of doing this or I have to write out the terms to find power series?
  11. C

    Represent (1+x)/(1-x) as a power series.

    Homework Statement Represent (1+x)/(1-x) as a power series. Homework Equations The Attempt at a Solution I started with 1/ (1-x) = sum (x)^n n= 0 - infinity (1 + x) sum x^n and this is where I am stuck. Homework Statement Homework Equations The Attempt at a Solution
  12. C

    Is this problem do able?

    I don't know initial and finial speed.
  13. C

    Is this problem do able?

    kinetic, momentum , cant think of the last one.
  14. C

    Is this problem do able?

    A proton with initial kinetic energy (5.2 MeV) collides with an alpha particle (initially at rest). The collision is perfectly elastic and the proton travels off at an angle of 133o relative to its initial direction. What is the velocity of the alpha particle after the collision? Assume the...
  15. C

    A radial acceleration problem.

    You really did help me out a lot. Yup finished b and c.
  16. C

    A radial acceleration problem.

    I see it. Edit: Got it! angle = 81.07 if I did this right. [PLAIN]http://img176.imageshack.us/img176/2347/32500903.jpg [Broken] Picture for who any1 wants to see what I'm doing. r=(sinB)R , R = 0.1m T=4rev/sec V= 4(1 rev)/sec = 4(2(pi)r)/sec a_rad= v^2/r ...
  17. C

    A radial acceleration problem.

    This is confusing me. v= wr, shouldn't speed be just 4rev/s ? edit: nvm the v= rev/sec , 1 rev= 2(pi)R, and therfore v = 4(2piR) / sec = 8(pi)R / sec
  18. C

    A radial acceleration problem.

    Ok, I got r=(sinB)R , since the hoop is spinning, the bead will be going up. As it goes up r will will be changing with respect to angle. where you get this?
  19. C

    A radial acceleration problem.

    Just to check is this right? a_rad= 4pi^2(0.1)/.25= 15.79 m/s^2
  20. C

    A radial acceleration problem.

    so that means the a_rad is pointing right from the bead?
  21. C

    A radial acceleration problem.

    Will this be the direction of a_rad?
  22. C

    A radial acceleration problem.

    Homework Statement [PLAIN]http://img508.imageshack.us/img508/6861/21296472.jpg [Broken] I tried to get a_rad and if i didn't make any mistake, then a_rad = 15.79 m/s. I need to find angle when the bean is at vertical equilibrium. Homework Equations a_rad= v^2/R =...
  23. C

    How do I find acceleration of two block.

    Omg you did it! Mass of B will be 25/9.8=2.55 Mass of C will be (the answer I got from part c), 30.8/9.8=3.14 so with the questions you gave me w-t=ma and t-f-p=ma i can t=w-ma and replace t in the 2nd equation w-ma-f-p=ma, and replacing with what I already know...
  24. C

    How do I find acceleration of two block.

    ma=t-f-parallel (block b) For block C there is only Tension and Weight. F=t-w, ma=t-w (block c), right?
  25. C

    How do I find acceleration of two block.

    Then how is it possible to solve for tension?
  26. C

    How do I find acceleration of two block.

    ∑F= t-f-parallel? N= cos(36.9)(25) Friction = (cos(36.9)25)(0.35) parallel= sin(36.9)25 T= can't i use the value i got from part c) of the problem?
  27. C

    How do I find acceleration of two block.

    N= cos(36.9)(25) Friction = (cos(36.9)25)(0.35) Tension = 30.8N ∑F= t-f-n? So i got 30.8-19.99-6.997=3.813N and mass is 25/9.8=2.55kg so in the end i get 3.813=2.55a a = 1.495m/s^2
  28. C

    How do I find acceleration of two block.

    huh? gravity is a force? so tension - friction - sin(36.9)(9.8) =ma ?
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