Calculus!!!

[koivu_11]

Hi I am in school part time and I am in a calculus class.

Is there any good forums where I can ask calculus questions?

Thanks.

[isleepinadrawer]

#math efnet

[AnimeFreak1013]

oh wow i hated calculus, i started out very good in 90s but then got lazy and started to skip alot and went down to high 50s

[Sajjad]

This forum, we've got some amazing mathl33ts (mathletes).

[mok86]

oh baby i'm teh pwn!

[eelfliw]

Why not ask your teacher? They're being paid to answer your questions.

Besides, since your teacher gave you those questions to begin with, they're best equipped to answer those questions.

Help us make better use of our tax money.

[evman150]

http://physicsforums.com/

Or you can ask here. Maths aren't exactly my specialty, but if it's just high school or first year I can probably handle it!

[winner2000]

Definitely try this

>> http://www.ilc.org/cfmx/AAT/AboutAAT...300&Lang_Sel=1

A free daily chat run by professional tutors (free!)...you usually have to wait a little bit depending on the time/subject etc., so do some other HW in the meantime.

[koivu_11]

alright thanks for the help people!

maybe I'll post the problem I'm having on here to see if anyone can figure it out!

[Fox2k]

yeah there are lots of post-secondary people on this forum itching to show off their random knowledge..you're bound to get some help.

[blizzah]

yeah there are lots of post-secondary people on this forum itching to show off their random knowledge..you're bound to get some help.

Calculus is exactly random now

[koivu_11]

ok well I think I figured it out but here it is to see if anyone gets the same answer as me...

Houdini's Escape!

Harry Houdini was a famous escape artist. In this project we relive a trick of his that challenged his mathematical prowess, as well as his skill and bravery. It will challenge these qualities in you as well.

Houdini had his feet shackled to the top of a concrete block which was placed on the bottom of a giant laboratory flask. The cross-sectional radius of the flask, measured in feet, was given as a function of height z from the ground by the forumla r(z)=10/sqrt(z) , with the bottom of the flask at z=1 foot. The flask was then filled with water at a steady rate of 22(pi) cubic feet per minute. Houdini's job was to escape the shackles before he was drowned by the rising water in the flask.

Now Houdini knew it would take him exactly ten minutes to escape the shackles. For dramatic impact, he wanted to time his escape so it was completed precisely at the moment the water level reached the top of his head. Houdini was exactly six feet tall. In the design of the apparatus, he was allowed to specify only one thing: the height of the concrete block he stood on.

A) Your first task is to find out how high this block should be. Express the volume of water in the flask as a function of the height of the liquid above ground level. What is the volume when the water level reached the top of Houdini's head? (Neglect Houdini's volume and the volume of the block.) What is the height of the block?

there's more but this is what I have done so far...

the answer I get for the height of the block is 2.025ft. does that answer look good?

[Thundercloud]

wtf, FEET?

[koivu_11]

wtf, FEET?

yup feet, it's an american question...

at the bottom of the page it says:

From Student Research Projects in Calculus, Coheh et. al., The Mathematical Association of America, 1991.

[koivu_11]

actually here is a link with the same calculus problem...

http://barzilai.org/cr/houdini.html

found it on google.