Science & Mathematics - 26 October 2007

“Imagine a plane is sitting on a massive conveyor belt, as wide and as long as a runway. The conveyer belt is designed to exactly match the speed of the wheels, moving in the opposite direction. Can the plane take off? “

2007-10-26 12:14:35 · 5 answers · asked by tru_story 4 in Physics

if the mass is 0.5kg and the density is 10.5g/cm3 what is the volume?

2007-10-26 12:09:23 · 6 answers · asked by wakeboarding <3 2 in Mathematics

I'm thinking of a science fair idea about the effects of writing on your skin. If it's a bad idea do you have a better one?

2007-10-26 12:08:22 · 11 answers · asked by freezepop10 1 in Other - Alternative

summation of
[(-1)^(n-1)] / ln (n+1)
from 1 to infinity

please show work

2007-10-26 12:01:06 · 2 answers · asked by Tiffany 4 in Mathematics

1. Hookes Law. The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If the distance is 67 cm when the weight is 4 kg. What is the distance when the weight is 8kg?

2. The speed of a stream is 3mph, a boat travels 3 miles upstream in the same time it takes to gtravel 9 miles downstream. What is the speed of the boat in still water?

3. Janet, an experienced clerk can fill a certain order in 9 hours, Jim, A new clerk, can fill the same order in 10 hours. Working togehter how long will it take them to fill the order.

I am helping my 16 yr old son with Algebra, all foreign to me, these are the 3 i dont know if the answers are correct, can you help?

2007-10-26 11:55:47 · 2 answers · asked by iwishiwereanangel 3 in Mathematics

2007-10-26 11:48:39 · 10 answers · asked by joseph g 1 in Mathematics

2007-10-26 11:47:02 · 7 answers · asked by joseph g 1 in Mathematics

2007-10-26 11:42:00 · 12 answers · asked by joseph g 1 in Mathematics

Why? Is it fair?

2007-10-26 11:41:04 · 6 answers · asked by Anonymous in Zoology

2007-10-26 11:38:37 · 3 answers · asked by Ken 1 in Physics

2007-10-26 11:37:10 · 37 answers · asked by Anonymous in Physics

2007-10-26 11:34:05 · 1 answers · asked by javanna g 1 in Zoology

given a=2, beta=20, c=5

have to find b, alpha, gamma

please help me step by step so I can follow, thanks

2007-10-26 11:31:41 · 4 answers · asked by Anonymous in Mathematics

I cut my Mimosa back to the ground because all of the limbs were dead from winter. As the new limbs came back from the root stock, they all came back green except for one brown limb. It is now about 4 ft tall and I don't have the brown leaves when I planted it two years ago. How do I fix this problem? Thanks

2007-10-26 11:28:41 · 2 answers · asked by John W 2 in Botany

What would you like to think happens to you? The reallity would probably be not very pleasant so let your imagination run riot and what would be the best outcome..

2007-10-26 11:20:38 · 11 answers · asked by H.A.L 3 in Astronomy & Space

A 900 g ball moves in a vertical circle on a 1.09 m-long string. If the speed at the top is 3.90 m/s, then the speed at the bottom will be 7.61 m/s.

What is the ball's weight?

What is the tension in the string when the ball is at the top?

What is the tension in the string when the ball is at the bottom?

2007-10-26 11:15:57 · 5 answers · asked by katie m 1 in Physics

2007-10-26 11:08:46 · 7 answers · asked by Anonymous in Astronomy & Space

Would I Be Able To See A satalite Or Something From My Bedroom (SouthCoast)
With A Normal Telescope?

2007-10-26 11:07:45 · 8 answers · asked by Anonymous in Astronomy & Space

3x+2y-8=0

Can someone please explain how you do it??

2007-10-26 11:07:43 · 3 answers · asked by Anonymous in Mathematics

how do u get the general solution of y" + 4y' + 3y =x +1

iv got alot of similiar question like this, but i dont know where to begin, if you can help me i would REALLY appreciate it!!!!!

2007-10-26 11:06:10 · 2 answers · asked by red-poka-dot-joe-bird 1 in Mathematics

a be used to solve any problem involving triangles
b only be used for right angled triangles
c only be used for triangles that have an obtuse angle
d only be used for triangles that have a straight angle

im not sure a or b thank you so much and god bless you forever

2007-10-26 11:05:15 · 9 answers · asked by Anonymous in Mathematics

An archer pulls her bowstring back 0.420 m by exerting a force that increases uniformly from zero to 222 N.
(a) What is the equivalent spring constant of the bow?

(b) How much work does the archer do in pulling the bow?

2007-10-26 11:02:28 · 3 answers · asked by bob 1 in Physics

The larger of two positive integers is five more than twice the smaller integer. The product of the integers is 52. What are the two integers?The smaller integer is___and the larger integer is___. This is a review question and I just can't figure it out without getting decimals, and i'm unsure of the answer. Please help. First right answer gets best answer.

2007-10-26 10:56:08 · 4 answers · asked by Lee 1 in Mathematics

block A has mass m_A = 2.09 kg, block B has mass m_B = 0.450 kg, and the rope connecting them has a nonzero mass 0.159 kg. The rope has a total length 1.07 m and the pulley has a very small radius. Let d be the length of rope that hangs vertically between the pulley and block B. Ignore any sag in the horizontal part of the rope.

If there is friction between block A and the table top, with mu_k = 0.201 and mu_s = 0.248, find the minimum value of the distance d such that the blocks will start to move if they are initially at rest. Ignore any sag in the horizontal part of the rope.

Force of the hanging mass is that of the vertical portion of the rope + mass of Block B * gravity
(M_r + M_B)(g) +
(.159+.450)(9.8) = 5.9682N = -5.9682N = Fnet of Block B

Tension T from Block A equals to Fnet of Block B = 5.9682N
Static Friction = (0.248)(n) = -5.079N

n = Mass of Block A * gravity = (2.029)(9.8)

Do I need Kinetic Friction in this problem?

Please Guide me. I'm Lost...

Thank You

2007-10-26 10:56:07 · 1 answers · asked by Anonymous in Physics

When we write an essay, there should be a conclusion , at the end. Whatever is at the end is a conclusion.
What should I do, assuming the body has been written well, to come up with the right conclusion?

2007-10-26 10:54:56 · 4 answers · asked by Janusz 1 in Botany

miles per hour?

2007-10-26 10:52:06 · 9 answers · asked by Panda Baby 3 in Weather

Have two city locations for weather & need only one. How to delete the other one

2007-10-26 10:51:59 · 2 answers · asked by Charles J 1 in Weather

you know the equation of circle.
x^2+y^2=r^2

how do you use that equation to graph a circle on a graphing calculator
-for ex,- the "y=" form of that equation

2007-10-26 10:51:17 · 6 answers · asked by shish_101 3 in Mathematics

Or near extinction. These animals deserve to be preserved for the future. Do you agree?

2007-10-26 10:49:30 · 12 answers · asked by Ruby Tuesday 2 in Zoology

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Algebra%20II/214%20tr/picture11.png

2007-10-26 10:43:28 · 12 answers · asked by Anonymous in Mathematics