Science & Mathematics - 29 August 2007

Something that is lightweight and pressure resistant. I have already tried pvc and it was to heavy. I thought about using a fluoresent tube cover because it is lightweight but will it be able to hold enough pressure. 150-200 psi

2007-08-29 11:49:16 · 3 answers · asked by BaseballDude#10 1 in Engineering

Doesn't it need to be insulated to make the current go round and round in circles?

2007-08-29 11:46:40 · 4 answers · asked by winter_new_hampshire 4 in Engineering

2007-08-29 11:46:22 · 4 answers · asked by dave s 1 in Mathematics

2007-08-29 11:46:02 · 9 answers · asked by melz 2 in Medicine

Ok show how to solve the integral [(sin(z)(z^3 - 2z)] / (2z^5 - 3z)

2007-08-29 11:44:06 · 1 answers · asked by Robert W 1 in Mathematics

2007-08-29 11:42:08 · 2 answers · asked by blessed 1 in Mathematics

2007-08-29 11:38:52 · 15 answers · asked by Anonymous in Other - Alternative

here are a couple of the problems I am facing.

f(x) = 5x^2 + 2x - 1


f(x) = 3y / x + 5

2007-08-29 11:38:17 · 3 answers · asked by Big Bob 2 in Mathematics

The sides are 2mm x 2km x 7mm

What do I do with the km?

28 mm2 km? Hmmmm???

2007-08-29 11:36:11 · 7 answers · asked by Me 4 in Mathematics

2007-08-29 11:30:03 · 17 answers · asked by Chuy 2 in Zoology

2007-08-29 11:27:41 · 10 answers · asked by ruffian 2 in Astronomy & Space

Look at the graph and comment on the sign of D or the discriminant. Form the quadratic equation based on the information provided and find its solution. The points are (-1,0), (0.67,0), and (-0.16,2) which is the vertex.

2007-08-29 11:27:23 · 2 answers · asked by Anonymous in Mathematics

2007-08-29 11:24:00 · 4 answers · asked by shadedmoss 1 in Biology

I think its the stars is that right?

2007-08-29 11:22:44 · 5 answers · asked by Jdotski Z 1 in Mathematics

Two 6-sided number cubes are rolled 270 times. The sum of 5 comes up 42 times. To the nearest hundredth, what is the experimental probability of rolling a sum of five? What is the theoretical probability of rolling a 5? Compare the 2 results.

2007-08-29 11:20:58 · 5 answers · asked by Anonymous in Mathematics

2007-08-29 11:20:48 · 13 answers · asked by Anonymous in Astronomy & Space

For instance what is:

256
x 23

or

256
x123

Please show working out? I have forgotten how to work out long multiplication by hand. I need to know in preparartion for a job interview tomorrow that is going to involve a few numeracy and written tests.

Thanks

2007-08-29 11:18:52 · 16 answers · asked by Anonymous in Mathematics

2007-08-29 11:18:43 · 2 answers · asked by dixicar07 1 in Medicine

2007-08-29 11:18:27 · 6 answers · asked by me m 1 in Earth Sciences & Geology

Prove that (1/9) is less than or equal to SQRT(66) -8 which is less than or equal to (1/8)

(without computing SQRT66 to 2 decimal places!)

Hint: Recall the Mean Value Theorem.

Can someone please show me how to do this problem without using "integral" or integration... just using elementary calculus i guess....


thank you!

2007-08-29 11:13:45 · 2 answers · asked by DSS 1 in Mathematics

I saw in a documentary that the whole population is now using 20% more natural resources than Earth can reproduce. I don't know where this 20% comes from, but it makes me think more about environment. It is as with money: we can spend more money than we earn, but if you continue doing so, you will go bankrupt? Does it mean one day Earth will go bankrupt?

2007-08-29 11:13:33 · 3 answers · asked by Anonymous in Earth Sciences & Geology

what is the domain of the following...?

s(y)=3y/ y=5


f(t)= ^3 square root of t + 4



h(x) = 10 / x^2 -2x



f(s)= suare root of s-1 / s-4



~thank you so much

2007-08-29 11:11:48 · 2 answers · asked by Jasmeen 3 in Mathematics

A source would be helpful.

2007-08-29 11:10:27 · 4 answers · asked by amsoil9hammer 2 in Chemistry

2007-08-29 11:08:22 · 6 answers · asked by atruenerdsays 1 in Chemistry

2007-08-29 11:01:28 · 4 answers · asked by i l o v e y o u ! 2 in Engineering

Suppose that 25% of all wise people are nice and half of all nice people are wise. Suppose further that 25% of all people are neither wise nor nice. What percent of all people are both wise and nice?

2007-08-29 10:57:08 · 3 answers · asked by Anonymous in Mathematics

i tought the moon had one full moon in 28 days, i looked at the moon last night and it was full . tonight i looked again and it was full again how is that so?

2007-08-29 10:57:01 · 7 answers · asked by george g 1 in Astronomy & Space

Suppose f:R-->R is differentiable at a. Let u and v be real valued functions defined on a neighborhood I of a such that u - v doesn't vanish on I - {a} and such that u(x) --> 0 and v(x) --> 0 as x --> a. Then, is it true that

lim ( x -->a) [f(a + u(x)) - f(a + v(x))]/(u(x) - v(x)) = f'(a)?

2007-08-29 10:54:38 · 1 answers · asked by Steiner 7 in Mathematics

2007-08-29 10:54:19 · 3 answers · asked by blessed 1 in Mathematics

Lots in the space aroud earth

2007-08-29 10:40:41 · 11 answers · asked by John H 1 in Astronomy & Space