Recent content by rubecuber

Homework Statement xy +yz + zx = 3 (1,1,1) Homework Equations equation of tangent plane is z-z0 = fx(x0,y0)(x-x0) +fy(x0,y0)(y-y0) The Attempt at a Solution Right, I've been a few of these exercises, however, this is the first one I've seen that equals a number and not "z". So...

Homework Statement Integral 17(sin(x))^3(cos(x))^9 http://www.mediafire.com/imageview.php?quickkey=55l9ediwdqxsg4f&thumb=4 Homework Equations Integration The Attempt at a Solution I get (-17(5sin(x))^2 +1)(cos(x))^10)/60. But I'm wrong. It says I need to change something...

GOT IT! Thanks.

Homework Statement The velocity v of blood that flows in a blood vessel with radius R and length l at a distance r from the central axis is v(r), where P is the pressure difference between the ends of the vessel and η is the viscosity of the blood. v(r) = P/4nl (R^2 - r^2) a) Find the...

Wow I'm stupid. I just figured it out. Thanks for putting up with this.

9 inches is 3/4 of a foot but I'm solving for three feet so that would makes nine inches a quarter of three feet. Am I really missing something this obvious?

And by the way, thank you for bearing with me

Great, so W= .5kx^2. Then 16=kx^2. Since the initial displacement is 3, 16/9 =k. Now knowing the spring constant to be 16/9 I can find the work to move it .25 of three feet as [(.5)(16/9)(.25^2) which gives me 1/18. But I'm still wrong? Did I make another stupid mistake?

Okay so I set 8 equal to the integral from 0 to 3 of the spring constant dx and then solve. How am I supposed to find the spring constant? Is there a better way?

Homework Statement "If the work required to stretch a spring 3 ft beyond its natural length is 8 ft-lb, how much work W is needed to stretch it 9 in. beyond its natural length?" Homework Equations F=kx. The Attempt at a Solution F=kx so 8 = 3k. k= 8/3 then I use an integral of...

basic quasar info: Quasar is a huge space object that is reeeeeealy bright anbd emits a looooooooot of radiation. i think that if you were to wikipedia it or read a brief history of time or spaceship neutrino, you'd get a getter understanding of it. Hazaaaaaaaaaaaaaaaaaaaaaaaaaa

well i woulnot consider it a force (such as i would gravity). The point is that it is expanding but that expansion started with the Big Bang and it wasn't constant, the uuniverse was not always expanding so i'd say No. But if you want to bring in dark matter and antimatter and all those things...

Sanman, these are the awesomestquestions because they deal in purely hypothetical circumstances. Now what's great aboutmother Earth is that we are in a region where thesun's rays are not too hot nor too cold. Mercury is way too close to the sun to be able to support life,venus is pretty close...

umm i don't have the book in front of me, i read it about a year ago, and my school library is closed. But it's in the first ten pages (near the beginning) just google neutrinos or wikipedia it. rubecuber

i thought that we were being constantly being bombarded by neutrinos,you should read the book SPACESHIP NEUTRINO (no it's not a picture book)