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timmy
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Has no life at all |
Location: UK, in Devon
Registered: February 2003
Messages: 13796
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We may still have some technical difficulties, though
Author of Queer Me! Halfway Between Flying and Crying - the true story of life for a gay boy in the Swinging Sixties in a British all male Public School
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Steve
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Really getting into it |
Location: London, England
Registered: November 2006
Messages: 465
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Even though now smith has given me an enormous load of homework 
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stephen
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Toe is in the water |
Location: UK
Registered: December 2002
Messages: 31
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that's my grandson for you - why do it himself when he can get others to do it for him! LOL!
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smith
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On fire! |
Registered: January 1970
Messages: 1095
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My mama didn't raise no fool 
Steve told me he didn't have anything to do, so I gave him a job....{smith ducks&covers}
Grandpa, I've got some trig here that needs doin'. You busy?
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smith knows better than to ask ME for help with his trig homework; after all, he wants to actually PASS the course!
We do not remember days...we remember moments.
Cesare Pavese
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May I suggest we all send at least a quick e-mail to megaman (megaman@iomfats.org) to thank him for all the hard work he puts in "behind the scenes" to make sure this message board and Timmy's website works smoothly from a technical standpoint (case in point being this recent migration, which it seems he watched over like a mother hen to make sure it happened as quickly as possible but without incident).
Sometimes I don't think he realizes how important his work is. He does it without fanfare, expecting little if any thanks (and, alas, that may indeed be all he gets).
How about it, folks?
We do not remember days...we remember moments.
Cesare Pavese
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rbryce
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Likes it here |
Registered: January 1970
Messages: 216
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No Message Body
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stephen
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Toe is in the water |
Location: UK
Registered: December 2002
Messages: 31
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smith, you know I have all the time in the world for you - but as I've already done your brain surgeon's entrance exam, aeronautical masters and quantum physics, I suggest that you are on your own with the trig. I can't do everything!!
Gramps
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smith
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On fire! |
Registered: January 1970
Messages: 1095
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I only had 2 questions tonigt....yea me !!
#1 How far off the ground are you and how far have you gone if you're in a ferris wheel in which the people at the top are 50 feet off the ground, and you've gone 3/8 of the way around?
The angle all the way around is 360*, so 3/8 of that is 135*; figure out the sine of 135*...-/2/2, so h=25+25-/2:=: 42.7 ft off the ground.
How far have you traveled.....arclength....3/8 of the circumference of a 25ft radius circle; so s=(3/8)(2Pi)(25)=75 Pi/4:=: 58.9ft. The circle is 2 Pi radius lengths, so the angle 360* is 2Pi radians. One radian=360*/(2Pi)=180*/Pi or about 57.3 degrees.
#2 What do the numbers 1/1, 1/2, 1/3, 1/4, 1/5....get closer and closer to?
It's clear they approach 0, so the limit is 0. The nth term is 1/n, so the notation is lim(n->oo)1/n=0. Use the function f(x)=1/x. As x->oo, f(x)->0, so lim(x->oo)fx=lim(x-oo)1/x=). Now you have a horizontal asymptote at y=0 since the output values approach 0 as the graph goes to the right. Let f(x)=x+3. Then, as x->3, f(x)->3=3, so lim(x->3)[x+3]=6.
Are they right? Please....someone tell me why I need to know this? >>>>>>>hahahahaha<<<<<<< smith
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smith
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On fire! |
Registered: January 1970
Messages: 1095
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I didn't know an 8 and a ) made a  ....I have a smoking guy in the middle of my homework wheeeee !!
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trevor
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Really getting into it |
Registered: November 2002
Messages: 732
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You use a lot of trig in electronics dealing with AC - alternating current - which includes all radio systems.
Quick example, you have 120V AC in your house. If you build an ac to dc converter (power supply) without a transformer, you will get about 160V out. Why? Because 120 is actually the "average" of the sine wave - the voltage actually goes from 0 to about +160 and back to 0 in 1/120th of a second, then reverses polarity 60 times (cycles - full sine waves) a second. To "steady" the pulsing voltage you use a capacitor which charges to the peak value, not the average value. 120V is the RMS (root mean square) or 1/sqrt(2) of the peak, or 160/1.414 (approx.)
Another: If you hook up a coil or something with a coil like a motor or transformer, the current and voltage become out of phase with each other by some difference between the two sine waves, called power factor. A power factor of 1 is 0 degrees out of phase, PF of 0 is 90 degrees out of phase. For non-coil loads like light bulbs, watts = volts x amps and there is a PF of 1. Not true for motors and transformers, you need to multiply by the power factor somewhere between 0 and 1. The power factor is determined by the properties of the coil. This is because coils store current (amps) for awhile and cause a time delay. (Similar to the way capacitors store voltage for awhile.)
This is why, for example, UPS's (Uninterruptable power supplies - like to protect the computer during power outages) are rated in VA (volts x amps) and NOT in watts.
Well, you asked!
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No Message Body
"But he that hath the steerage of my course,
direct my sail."
-William Shakespeare, Romeo and Juliet, Act One, Scene IV
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stephen
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Toe is in the water |
Location: UK
Registered: December 2002
Messages: 31
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Stop helping him, he'll never learn!! LOL. I didn't understand a word of what either of you were talking about, so I must be getting old!
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...be able to solve diffeential equations using power series and their limits one day... Well, there the limit you calculated comes usefull... And they actually keep telling me that knowing how to solve differential equations is going to be usefuöll someday...
Setras
That which is dreamed can never be lost, can never be undreamed.
-Master Li in Neil Gaiman's Sandman
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