Math Problem of the Day

[Dr. Strange]

What is the formula for the radius of a cylinder?

Extra Credit: Did mcctatas really remember the correct formula?

Super Extra Credit: On SOAP, who was Danny Tate's biological father?

[struggle4progress]

1. Begin with "radius = distance/thyme." I checked the container

of thyme in my pantry: it holds 8 oz; so put "thyme = 8." I had to walk about 20 feet to check it, so put "distance = 20." So the radius of that cylinder is 2/5. YMMV

[Dr. Strange]

2. That's some sage advice you have there.

[TZ]

3. hmm

It has pi and it has r. Thats all I can remember. There are a few different formulae floating around in my head but I don't remember any..

[redqueen]

4. The radius of a cylinder?

Is that different from the radius of a circle?

(This is probably a stupid question... if so, sorry!)

[TZ]

5. Yeah definitely different

Problem is I don't remember which one of the multiple formulae I memorized it is. 2 pi r?

[Dr. Strange]

7. Yeah, a cylinder is a three-dimensional object.

But the ends of the cylinder are circles, so there are circles involved.

[redqueen]

10. Yeah but so...

what is the radius of the cylinder? I mean, how is it different from the radius of the circle shape that is consistent along its length? I'm not understanding this...

[Dr. Strange]

11. It's not.

That's what we mean by the radius of a cylinder: the radius of the circle at the end.

[redqueen]

14. ...

x(

[racaulk]

6. I can give you the formula for the volume of a cylinder.

V = pi * r-squared * h

(Does DU allow for greek characters and superscripts?)

You want the surface area?

SA = (2pi * r-squared) + (2pi * r * h)

I think that's all I can give you. I didn't know that a cylinder (or any 3-dimensional solid) could have a radius... :shrug:


Extra Credit : Doubtful. Very, very doubtful.

Super Extra Credit : Dude, you're showing your age! All I remember about Soap is that is starred the same red-haired actress that was Mona in "Who's the Boss?," though I don't remember her name. Do I get any credit for that?

[Dr. Strange]

9. Dude!

I didn't know that a cylinder (or any 3-dimensional solid) could have a radius.

What do you think that "r" means in your formulas?

All I remember about Soap is that is starred the same red-haired actress that was Mona in "Who's the Boss?," though I don't remember her name.

You win the second-place prize: Betty White copping a feel from you.

[racaulk]

16. Dude!

I know what r means, silly! But you asked:

What is the formula for the radius of a cylinder?

So I thought you were expecting something in the form of r = ___.

Oh, wait a minute! How's this? r = sqrt {V / (pi * h)}

Do I win now? :woohoo:

[Dr. Strange]

18. Dude!!

r = sqrt {V / (pi * h)}

That's exactly what I would think. (Assuming you know the volume and height, you can find the radius.)
But mcctatas won't tell me what the original problem was, so I don't know if this is what she was looking at.

[struggle4progress]

27. .

V = π r² h

http://webdesign.about.com/od/localization/l/blhtmlcodes-gr.htm
http://www.tizag.com/htmlT/htmlsuperscript.php

[racaulk]

36. Oh, very cool!

Thanks! :hi:

[MrCoffee]

8. The radius of a cylinder?

Isn't it d/2?

That seems to easy. This is some sort of trick, isn't it? ISN'T IT?!?!??!

[Kali]

31. my answer, too

[flvegan]

12. Formula: r = MrCoffee's mom's squealing dB / 2

Extra credit: no

Super extra credit: Fonzie.

[MrCoffee]

13. I'm gonna kick you in the pi-hole.

[Dr. Strange]

21. Super-Duper Extra Credit: Find the radius of flvegan's pi-hole.

Express your answer in terms of vegan numbers only.

[Lyric]

24. Well that's easy.

Since 5gan's pi hole is infinite, the radius would simply be half of infinity, expressed pictorially as a shark carved out of a carrot that is eating its own Tofurky tail.

:D

[TZ]

25. are vegan numbers the same as imaginary numbers?

:hide:

[Rosie1223]

15. 1) you don't need a formula, you need a ruler

2) of course, she's more than just a pretty face.
3) Chester, but I cheated off MrCoffee's paper.

[Orsino]

17. Half the diameter of the base. n/t

[Lyric]

19. It's still a circle, right?

?

My uneasiness is that if the two end circles are different sizes, is it still a cylinder? Because if that's the case, then there would be more than one radius, depending on where you measured.

I dunno. I'm not a freaky math douche like you. :P

[Dr. Strange]

20. If the end circles had different radii...

then it would not be a cylinder--it would be a "frustrum". (http://www.engineersedge.com/volume_calc/frustrum_cone.htm)
That's the word of the day: frustrum. Use it all over the place.

I'm not a freaky math douche like you.

You kiss our love child with those lips?

[Lyric]

22. Frustrum sounds like a dirty word. I like it!

So was I right? Is it the same formula you'd use to determine the radius of ANY circle?

[Dr. Strange]

23. You could.

But then it would really be a question about a circle, not a cylinder. And mcctatas won't tell me the original problem, so my mind is a whirling dervish of preponderment.

[mcctatas]

26. I can't see you, I have put you and your snobby mathish ways on ignore

:P

[Dr. Strange]

28. I cannot begin to calculate the radius of convergence of the power series that is your ignored post.

n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t n/t

[mcctatas]

30. oh go bugger off and wank to the latest edition of the Journal or Applied Mathematics

FREAK!

[Dr. Strange]

32. OMG!

"Journal or [sick] Applied Mathematics"
That's a low blow!

[CreekDog]

29. Don't know? You will...

after this episode of...SOAP.

[Dr. Strange]

34. Ding-dong.

You want me to get that?

[Dr Morbius]

33. There is no formula.

To find the radius of a cylinder, measure across the base and divide by two.

[Dr. Strange]

41. But then why mention a cylinder at all?

That makes it circle problem. I'm all consternated here!

[Dr Morbius]

46. To confuse you.

What is the difference between a circle and a cylinder? A cylinder is the full solid of a circle; it's a circle extended to three dimensions. The radius of a cylinder equals the radius of the circle on the end.

Some things one calculates. Other things, one measures. Assuming you have the volume or surface area and height, you can calculate the radius. Others have given you these formulae, but here:

The surface area of a cylinder = 2 (pi) r^2 + 2 (pi) rh
Volume of a cylinder = (pi) r^2 h

Then it's simple algebra to find r.

I think yer friend's playin' wit' yer head. :) Ask her in response to prove why pi must necessarily be irrational!

[Shell Beau]

35. Math sucks.

I got the math award in 1st grade. After that, it was all downhill. Don't even bring up long division.

[Dr. Strange]

37. Um, no.

http://www.mathdoesntsuck.com

Danica is disappointed in you.

[Shell Beau]

39. Math doesn't suck for those who are good at it.

Looks like she might be good at more than just math *nudge, nudge, wink, wink*

[Dr. Strange]

42. Um...

Looks like she might be good at more than just math *nudge, nudge, wink, wink*

You think she might be good at statistical mechanics too? I bet you're right.

[Shell Beau]

55. You read my mind.

;)

[HiFructosePronSyrup]

38. r = (V/(pi*h))^1/2

:shrug:

[Dr. Strange]

40. That's what I think.

Of course, that's assuming you know the volume and height. If you're given the surface area and height, you use a different formula. So the formula would really depend on what you're starting with. And mcctatas won't tell me what the original context was.

She's toying with me, I know it.

[TZ]

43. hmm.

Lots of Math geeks in this thread=also known as people who need dates.....:rofl:
http://gizmodo.com/5174288/computer-science-majors-get-laid-more-than-any-other-kind-of-geek
:evilgrin: Look what is at the top of that scale...

[RandomThoughts]

44. Says he was senile thinking he was fighting ww2 on wiki.

Are you referencing the Neo Con report on the news, when they said all Islam are Nazi

Or when Bush was reading the book on ww2 before Iraq?



Here is the thing, some people read a book, and put themselves in that story, and try to make their world fit the book. I find it better to take the good parts of stories you can learn from and bring them into your own life.

Can you see the difference?

So you don't say we are fighting nazi's in Arizona, thinking it is just like 30's Germany, but you do have to know that some of the things done in many totalitarian regimes, is what they did when they ostracized Hispanics citizens. It is also important to know why nazi's are bad, and it is not just what they did, it is also the belief system of superior races, and being special and thinking they should figure out who lives and dies.


My point is, assuming any of the news is true, is that they are not trying to be ww2, but there are lessons of what not to do from that time, and from those lessons, we learn what we do not accept.

[Dr. Strange]

47. Hi there, ReallyRandomThoughts!

:hi:

[RandomThoughts]

48. It wasn't that random.

The guy asked about the father character in soap.

And wiki, although not the best source, said.

Arthur Peterson, Jr. - The Major - The father of Jessica Tate and Mary Campbell. The major suffers from senility and believes he is in the midst of fighting World War II

And I think I remember a little of the show.

So I was responding to his comment on that.


And hello back :hi:

[Dr. Strange]

50. Ah, I'm hip now.

The Major was not Danny's father.

But he did have some serious WW2 flashbacks.

[RainDog]

45. I wish I had a mathematical mind

it's not fun to be math-mind impaired. I can't even think very spatially.

[Duer 157099]

49. Benson? n/t

[Dr. Strange]

51. Nope, wasn't Benson.

[Duer 157099]

52. Burt Campbell? n/t

[Dr. Strange]

53. Nope.

Here's a "hint": he also killed Burt's son Peter Campbell.

[Duer 157099]

54. Wait, not *this* Pete Campbell?

Was it Dutch? How about that priest guy?