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.
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
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...
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...
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!
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...
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...
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...