Recent content by z.js

  1. z.js

    Undergrad Calculating latitude and longitude at any time

    I was not so extreme as to that though... I will have a look at the book.:smile:
  2. z.js

    Undergrad Calculating latitude and longitude at any time

    Yes, I quite agree. :biggrin:
  3. z.js

    Undergrad Calculating latitude and longitude at any time

    I just do not like GPSs. They give you your exact location, BUT to me I feel like a dummy, using that. What I asked for was one that you could use your brain on. I need to find lat. and long. at any time of a given day.
  4. z.js

    Undergrad Calculating latitude and longitude at any time

    Calculating position on Earth at anytime I've already posted this somewhere else, but I would like some more answers to it.:smile: https://www.physicsforums.com/showthread.php?t=760001
  5. z.js

    Undergrad Calculating latitude and longitude at any time

    The exact way to do it is like this. 1. Find three or more brighter(and therefore more important) stars. 2. Measure the height of each star in at most two minutes with a sextant or something. Two minutes would give you plenty of time to measure and also, the amount of error is not so high. 3...
  6. z.js

    Undergrad Calculating latitude and longitude at any time

    Well, I already know this way. What I meant is in the daytime and using the sun, chronograph and other things like that.
  7. z.js

    Undergrad Calculating latitude and longitude at any time

    oops... please move this to 'Other sciences>>Earth' Buhowyeesii ;)
  8. z.js

    Undergrad Calculating latitude and longitude at any time

    Calculating latitude at noon is easy: say I got ##73^o## on 6/20/2014 So, ##90^o-73^o=17^o## then ##17^o+(\frac{1}{91})^o=17.01^o##(i forgot how to find N or S:biggrin: Calculating longitude is also easy: First I set my watch to 12 00 at solar noon. Then, I find the time difference between my...
  9. z.js

    Faulty electricity homework question?

    Well, in series, the current is constant across the circuit. So if I can find V for which both graphs have the same I, I guess that would be it... something to chew on... looks like I = 400mA for which both V are approximately equal to 2V! Thanks guys!
  10. z.js

    Faulty electricity homework question?

    Sorry... it was a typo. The diode and resistor are in series, not parallel. @Simon Bridge: "(R = 1/gradient). Since V = IR, the voltage drop across the diode also approaches zero." You said this was incorrect... could you elaborate on that? "Therefore the effective resistance of the...
  11. z.js

    Faulty electricity homework question?

    Hi, Hoping someone will be able to help me out with a electricity homework question that sounds a bit unreasonable to me. Homework Statement Question 8 (Read the section after Q4 first!) The I-V characteristics of a diode and a resistor to be used in a simple circuit with a varaible...
  12. z.js

    Difficult G.P. Problem from a Difficult Math Book

    Homework Statement 15. The series $$a+ar-ar^2-ar^3+ar^4+ar^5-ar^6-ar^7+...,$$ where ##a>0##, has its ##k##th term, ##T_k##, defined by $$T_k=ar^{k-1}$$ if ##k## is of the form ##4p-3## or ##4p-2## and $$T_k=-ar^{k-1}$$ if ##k## is of the form ##4p-1## or ##4p,## where p is a positive...
  13. z.js

    Undergrad What Is Infinity? Analyzing the Limit of x→∞

    But, what about my equations?
  14. z.js

    Undergrad What Is Infinity? Analyzing the Limit of x→∞

    Why, sure as you live, that's JUST IT!:biggrin:
  15. z.js

    Undergrad What Is Infinity? Analyzing the Limit of x→∞

    Well does my equation make sense? ##∞## might be absorbent, but I'm not sure.