Recent content by oportunity

  1. O

    Undergrad Calculations for sun position follower

    HI I'm making a sun follower with a pic, and I need the formulas to calculate the position of the sun, I need to calculate azimuth angle and zenith angle (Is that enough to know at any time the position of the sun?). Thanks
  2. O

    Electromagnetic induction problem

    Homework Statement http://imageshack.us/photo/my-images/194/55132039.png/ http://imageshack.us/photo/my-images/194/55132039.png/ How much curret flows trough circuit ABCD when the center of the circuit (O) is distance r from the straight wire? I think these are the relevant equations...
  3. O

    Amount of power consumed by a non linear light bulb

    yes. thanks
  4. O

    Electric field, magnetic flux , potetial difference

    i get it, thanks a lot.
  5. O

    Electric field, magnetic flux , potetial difference

    No, i don't know. please tell me. this is really important. help please.
  6. O

    Electric field, magnetic flux , potetial difference

    you mean lorentz force?
  7. O

    Electric field, magnetic flux , potetial difference

    Homework Statement As shown in the figure below, potential difference V exists between two parallel plates(a,b) that have a small hole. Uniform electric field E and magnetic flux density B exist in the region above the plates, and are perpendicular to each other. The directionof E is parallel...
  8. O

    Amount of power consumed by a non linear light bulb

    ok. thanks
  9. O

    Amount of power consumed by a non linear light bulb

    Homework Statement figure 1 shows the relation ship between voltage and current when voltage is applied o a certan light bulb. Next as shown in figure 2, the bulb os connected n series with a 12V battery and 5Ω resitor. Figure 1 http://imageshack.us/photo/my-images/585/imagnecir.png/...