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About dndfuf98

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  1. What do you mean by "short"?
  2. So in the phase diagram, since the temeprature doesn't change while phase changing, does the internal energy also not change?
  3. On A) of #7 of circuits of ap style, could you explain why your answer is right? I thought C and D had the most current immediately after closing because c has 2v/r and D also had 2v/r.
  4. On ap style number 7 on magnetics, shouldn't the answer to b be cos instead of sin? Where did you get sin from?
  5. On gangnam style problem (AKA ap style), on number 7, I think the answer is C=D>A=B>E could you check on that.
  6. In ap style problem section, #8 on fluid section, isn't the net force 800-4-707??? In the explanation you talked about the pressure holding the lid, but you didn't include in the net force.
  7. Om 7.27, I don't understand the picture. I'm not sure how the wire can produce emf when the wire doesn't have an area of change. The answer says it's moving horizontally, but isn't the wire just moving without changing the area?
  8. On question 7.33, there isn't sufficient explanation for the answer. Could you elaborate on that please? I'm not sure what is causing the needle to point toward the top. By the way, does toward the top mean out of the page or just top?
  9. In the electricity part of the AP style problems, I think there is an error for #8. I think the initial current is 0.6 instead of .75. Shouldn't R2 and R4 be in series? Then, R24 (combined) would be 2R. R234 (combined) would be in paralled and be 2R/3. Then, the Req would be R1+R234 (R+2R/3) which is 5R/3. Then wouldn't the current be 3/5? Not .75.
  10. For #2 of the Gravity part of the AP style problem, I'm not sure why speed has to increase in order to increase the radius. I thought speed has to decrease because of the inverse relationship with radius according to the derived equation, v = square root of Gm/r.
  11. For #14 of the circular motion & rotation part of the AP style problems, for (c) why is the answer 2L/t instead of L/t? I don't understand why the L was doubled.
  12. For #15 of the Dynamics part of the AP style problems, why can't we use mgsin instead of Normal force, AND why can't we use mgcos for Normal force - why do we have to derive another one.