Science & Mathematics - 2 December 2007

So Im really confused.. Im helping my friend out with a math question, and I need some help, cause im stumped.

3/8 = n/128.

Aka: three over eight, equals, n over one hundred and twenty-eight.

How do I do this, and whats the answer?

2007-12-02 09:15:36 · 6 answers · asked by chatterbox_2122 2 in Mathematics

27 ÷ 3 – 12 ÷ (4 + 8)

2007-12-02 09:15:33 · 4 answers · asked by Anonymous in Mathematics

What is the right way to balance these complex equations? I don't think I am doing it correctly, which is why I'm having such a hard time. For example:

C3H6 + NH3 + O2 -> C3H3N + H2O

What steps do I take to balance this so I don't screw it up and can do it as quickly as possible and properly?

2007-12-02 09:15:25 · 2 answers · asked by myname_isalbert 1 in Chemistry

Evaluate. | –5 | + | 5 |

2007-12-02 09:15:05 · 27 answers · asked by Anonymous in Mathematics

Express 342% as a decimal.

2007-12-02 09:14:32 · 11 answers · asked by Anonymous in Mathematics

I see where you can insert the exponents 2 and 3 but I need to insert a 6 as an exponent. I don't see it in the symbol/math.
I need to write 7 to the 6 power.

2007-12-02 09:13:55 · 4 answers · asked by Anonymous in Mathematics

f(x) = x^3

g(x) = tan x

f(g(x)) = ???

i think the answer is tan^3 x but it could be tan x ^ 3 or is that the wrong way to write it? thanks for any help

2007-12-02 09:11:20 · 6 answers · asked by AP12 2 in Mathematics

How are both of these different in 2 ways?

2007-12-02 09:07:34 · 4 answers · asked by Anonymous in Biology

A) A force of 40N is required to pull a 10kg wooden block at a constant velocity across a smooth glass surface on Earth. what would be required to pull the same wooden block on the planet Jupiter???
Ok first off, it doesnt give the gravity due to accel on Jupiter, and i dont know any formulas. I drew it out and I'm just completely lost.. I looked up Jupiters actual gravity (24.5m/s^2) and used f=mg to find 245N. and then i set up a proportion, you know how 98 over 40 = 245 over x. that got me close to the answer but how do you actually find it the right way?

B) Use G(m1)(m2) over d^2 (newtons version of keplers 3rd law) to find the mass of the earth. the moon is 3.9e8m away from the earth and the moons period is 27.33 days. okay i dont have the mass of the moon and what does all of that have to do with the formula they told me??

C) the asteroid ceres has a mass of 7e20 kg and a radius of 500km. whats g on the surface? what formula do i use!? none of them help me with it!

2007-12-02 09:07:28 · 1 answers · asked by E 2 in Physics

2007-12-02 09:06:24 · 8 answers · asked by jkss 1 in Mathematics

2007-12-02 09:04:37 · 2 answers · asked by Whatupdawg 3 in Mathematics

Two cards are selected at random from a shuffled standard deck of 52 cards, without replacement. Find the probability that

Both cards are a picture card:

Both cards are queens:

2007-12-02 09:03:45 · 6 answers · asked by bobby m 1 in Mathematics

consider these three equations: Y= 0.625^x, Y=0.375^x, and 1-0.5^x


a. Sketch graphs of the equations on one axes.


its my sister's problem so if anyone can help her or explain how to do this in the best way that you can it would help.

2007-12-02 09:03:08 · 1 answers · asked by Anonymous in Mathematics

Ok, so I know that you factor it so it would be:
(x+4)(x-2)<0,
and you find the critical values, so it would be:
x=-4 and x=2

What do you do after that (what would the solution set be) and how do you graph the solution set?

2007-12-02 09:01:42 · 5 answers · asked by Anonymous in Mathematics

hi
i am building a prepaid meter and i need a relay/circiut breaker that can be controlled by a micro controller to do the switching
it must be very reliable
any help?

2007-12-02 09:01:31 · 3 answers · asked by GILBERT M 2 in Engineering

I have a science fair project to do. So, I was wondering if they are synonyms?

2007-12-02 09:00:41 · 3 answers · asked by Anonymous in Botany

2007-12-02 08:57:25 · 14 answers · asked by Anonymous in Physics

a science question of atoms. i cant figure it out, and i need help. please answer it with steps so i can see how you did it. thank you =]]

2007-12-02 08:56:23 · 3 answers · asked by Clueless Person 1 in Chemistry

Solve by the addition method:
2x+4y=-2
3x-y=11

2007-12-02 08:55:44 · 4 answers · asked by tianna_85902 1 in Mathematics

Here is the problem:
A box has a square base of side x and height y. Find the dimensions for which the surface area is 20 and the volume is as large as possible.
When I solved the problem, I came up with one of the sides equaling the square root of 10/3, but once I tried it in the first derivative test, it fails. Can someone help me out, my book is bad and I don't know where else but here to look.

2007-12-02 08:53:34 · 2 answers · asked by krispykreme487 1 in Mathematics

An organ pipe that is open at both ends has a fundamental frequency of 389 Hz at 0°C. Using the fundamental frequency for this pipe at 20°C, what is the length of the organ pipe?

2007-12-02 08:52:58 · 1 answers · asked by Anonymous in Physics

2007-12-02 08:50:31 · 5 answers · asked by jokersrage2 1 in Mathematics

A 62.0 kg person jumps from rest off a 10.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative.

2007-12-02 08:49:41 · 2 answers · asked by scarlet123 2 in Physics

2007-12-02 08:49:41 · 4 answers · asked by Anonymous in Chemistry

If -2x+3=7 and 3x +1=5+y, the value of y is...

(A) 1 (B) 0 (C) -10 (D) 10

i know i can just plugin each mulitple choice into the problem but i can't show my work like that..
thanks a bunch for whoever can help me with this problem

2007-12-02 08:49:30 · 5 answers · asked by Blah 4 in Mathematics

thanks!

2007-12-02 08:49:04 · 13 answers · asked by Anonymous in Medicine

1. )when do you use cis and trans? I am so confused..
i am learning about alkynes . . and while naming them
some have trans or cis before them..how do i know when to
put them?

2.) When do you use nonen?

2007-12-02 08:48:59 · 3 answers · asked by Velvet - joux 3 in Chemistry

A frictionless block of mass 1.95 kg is attached to an ideal spring with force constant 310 N/m. At t=0 the spring is neither stretched nor compressed and the block is moving in the negative direction at a speed of 12.6 m/s.

Find the amplitude.

Find the phase angle.

2007-12-02 08:48:14 · 3 answers · asked by Bugz 3 in Physics

What are the three species that actually exist in significant amounts in a one-tenth molar aqueous solution of HCl?

Explain why hydrogen ion (H+) is NOT one of the three species.

2007-12-02 08:47:50 · 1 answers · asked by RogerDodger 1 in Chemistry

A 35 g ball released from rest falls vertically. It hits the ground and remains in contact with it for .5 ms. Rebounding elastically, it returns to its original height. The whole trip takes 8 s. Calculate the average force on the ball during contact with the ground.

2007-12-02 08:46:26 · 3 answers · asked by Anonymous in Physics