help me math help

# Thread: help me math help

1. Senior Member
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Dec 1969
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105

## help me math help

okay,<BR>i know this doesn&#039t belong here but can someone give me an answer fast. it&#039s about logs<BR>okay i know to convert to a base 10 log you do something like this lg = log base 2 log= base 10<BR> let say you have: lg 5<BR>to convert to log 10 you would say something like<BR>lg5 = (log5)/(log2)<BR>help!!!! please!! sorry!

2. Senior Member
Join Date
Dec 1969
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142

## RE: help me math help

5 chocolate logs divided by 2 chocolate logs = 2 and a 1/2 chocolate logs ;)

3. Senior Member
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Dec 1969
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96,118

## Nope! Inconsistent units!

Think of this example:<BR><BR>60 miles-per-hour times 2 hours = 120 miles<BR><BR>Why? Because the UNITS cancel, just the same way that numbers do!<BR><BR>Thus:<BR><BR>60 M &nbsp; * 2 H<BR>----<BR> &nbsp;H<BR><BR>becomes<BR><BR>60 M * 2 H<BR>------------<BR> &nbsp; H<BR><BR>The H below the division line cancels the H above the line, so indeed the result is <BR><BR>120 M<BR><BR>To take the example:<BR><BR> &nbsp; 5 chocolate logs divided by 2 chocolate logs <BR><BR>and let "L" stand for "chocolate log(s)"...then we do:<BR><BR> &nbsp; 5 L<BR> &nbsp; ---<BR> &nbsp; 2 L<BR><BR>and we end up with the L above the line cancelling out the L below the line, so the result is simply<BR><BR> &nbsp; &nbsp; 2.5<BR><BR>no units! Just a simple real number with no units.<BR><BR>There...your pedantic math lesson for the day...<BR><BR>(p.s.: Ending up with inconsistent units in Physics and Chemistry problems is a sure sign you set up the problem incorrectly! If you care.)<BR><BR><BR>

4. Senior Member
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## Way off topic, but fun...

Yes, you have the formula correct.<BR><BR>Usually, it&#039s expressed in natural logarithms (Ln for natural logs, Log for base 10):<BR><BR>Ln(N) == Log(N) / Log(e)<BR><BR>where "e" is 2.718281828... (the base of natural or Napierian logarithms).<BR><BR>But it is just as true for any other logarithm base(s).<BR><BR>You can also transform the equation to get the other useful fact:<BR><BR>Ln(N) == Log(N) / Log(e)<BR><BR>becomes [ multiplying both sides by Log(e) ]<BR><BR>Ln(N) * Log(e) == Log(N)<BR><BR>And you can extend *that* to see why it all works in the first place:<BR><BR>Ln(N) * Log(e) == Log(N)<BR><BR>transforms [ because Log(b^a) is the same as a*Log(b) ] to <BR><BR>Log( e ^ Ln(N) ) == Log(N)<BR><BR>But the *definition* of logarithms says that <BR><BR>e ^ Ln(N) == N<BR><BR>so, Q.E.D., <BR><BR>Log(N) == Log(N)<BR><BR>****************<BR><BR>Whew! It&#039s been 30 years or so since I did that kind of stuff! Fun to realize that I still remember it!<BR><BR>

5. Senior Member
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## Fun? You gotta be kiddin' me

BW,<BR><BR>I know fun is relative, but logarithms?<BR><BR>Ufta. I guess I won&#039t drink the water if I am ever in your part of the country. :)<BR><BR>whadda ya think of Mitchells attempt at popups, I like mine better.(of course)<BR>skol

6. Senior Member
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## Okay, then...relaxing.

&nbsp;<BR>&#062; I know fun is relative, but logarithms?<BR><BR>Ehhh...it&#039s a break from trying to make Japanese text work. And it *was* fun pushing the old tired gray cells into remembering all that stuff.<BR><BR>&#062; Ufta. I guess I won&#039t drink the water if I am ever in your part of the country. :)<BR><BR>Water? Drink? Water is for washing. What part of the country you come from that you actually drink the stuff???<BR><BR>&#062; whadda ya think of Mitchells attempt at popups, I like mine better.(of course)<BR><BR>I still say: Use Outlook Express News reader as your model. MS spent many many person-years and many millions of dollars coming up with that interface. Piggy-back on their success.<BR><BR>

7. Senior Member
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Dec 1969
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1,362

## water is the main ingredient in Beer, and is good

Okay,<BR><BR>>Water? Drink? Water is for washing. What part of the country you come from that you actually drink the stuff???<BR><BR>Well not explicitly, its an implicit thing. When drinking beer, you are actually drinking water with some good stuff added. <BR><BR>skol<BR>as for country, I watch the Badgers and the Packers, I hunt fish and have a beard. <BR>I am not going to explicitly tell you......<BR>

8. Senior Member
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Dec 1969
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96,118

## "It's the water..."

...is (was?) the marketing slogan for Olympia beer, produce just down the road a piece (okay, an 80 mile piece) from here. From Tumwater, Washington (a suburb of Olympia, WA, state capital, hence the name).<BR><BR>But anyway...<BR><BR>Shostakovich wrote:<BR><BR>&#062; as for country, I watch the Badgers and the Packers, I hunt fish and have a beard. <BR><BR>Ummm...let&#039s run that by again...<BR><BR>&#062; ...I hunt fish...<BR><BR>WOW! I knew the muskies could get big back there, but to actually have to *hunt* them! You use a shotgun or are you more sporting than that?<BR><BR>[ Ain&#039t missing commas fun things to watch out for? ]<BR><BR>

9. Senior Member
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Dec 1969
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1,362

## Yes,*comma*, fish do get big,*comma*

Your retentiveness proves your programming ability,<BR> your worse than my grandmother.<BR><BR>The muskies are big, record was caught just a ways from here.<BR>Second largest typical buck was shot 25 miles from here.<BR> (sorry peta, its a way of life here)<BR><BR>Well, I used outlook express. Not too bad. That thread marking stuff is cool.<BR>To get that nice control, I would have to open a new window and eliminate the back and forward buttons, they seem to cause problems in frames.<BR><BR>a thought, but that psychology of windows opening up on people, its not good, its like running out of beer during a Packer game. ohhhh(bad memories) (and this year we will need beer)<BR><BR>as for olympia, i remember that crap(i say it with affection). It could give me a hangover.<BR><BR>skol

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## Is a superscripted comma an apostrophe?

&#062; Your retentiveness proves your programming ability,<BR>&#062; your worse than my grandmother.<BR><BR>Should be<BR><BR>...you&#039re worse than my grandmother.<BR><BR>You missed the apostrophe.<BR><BR>****************<BR><BR>&#062; as for olympia, i remember that crap(i say it with affection). <BR><BR>Well, you don&#039t think that *I* drink it, do you? Hart ale or Guiness Stout, maybe. But an American beer??? (Though even Guiness is watered down here in the States. Sigh. See! Too much of that damned water!)<BR><BR>

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