Science & Mathematics - 5 August 2007

We know the answer just not the steps

2007-08-05 16:01:45 · 9 answers · asked by jess b 1 in Mathematics

2007-08-05 15:57:54 · 4 answers · asked by Anonymous in Mathematics

2007-08-05 15:57:15 · 4 answers · asked by Anonymous in Mathematics

2007-08-05 15:56:31 · 7 answers · asked by sweetgirl78228 2 in Chemistry

2 cars, each going 30= same effect as a collision at 60 to a non moving wall?

2007-08-05 15:53:29 · 7 answers · asked by Felliph3 3 in Physics

what goes up must come down

2007-08-05 15:51:26 · 10 answers · asked by Felliph3 3 in Physics

It's related to Sequencing and assembly

2007-08-05 15:51:07 · 1 answers · asked by Anonymous in Biology

I'm trying to determine an expression for average torque during the power stroke from a one-cylinder engine with a standard crankshaft.

Let the crankshaft angle when the piston is all the way down be 0 degrees, and when the piston is all the way up, let it be 180. Let the connecting rod be long so the angle between it and vertical can be ignored.

An expression for the instantaneous torque at 90 degrees (when the piston is halfway from bottom to top) would be
T = F*d
where F is the force and d is the distance from the crankshaft centerline to the bearing where the connecting rod and crankshaft mate (the lever arm).

The expression
T = F*d*sin(theta)
should be valid while theta varies from 0 to 180, the 1/2 revolution during which power is available. )Probably F would not be a constant but let's assume it is.)

My problem is how to get the average torque over the 180 degrees of the power stroke. Please, I really need to learn how, more than I need the answer.

Thanks

2007-08-05 15:49:17 · 2 answers · asked by sojsail 7 in Mathematics

2007-08-05 15:49:13 · 4 answers · asked by mastermind 1 in Mathematics

2007-08-05 15:47:15 · 6 answers · asked by peggy anne o 1 in Astronomy & Space

Our DNA and the DNA of all other living organisms is in the form of a code or language, is it not? Do languages spontaneously develop, or do they always have intent and an idea to communicate from some source behind them?

To understand the entire question and its complexity, please see

http://cosmicfingerprints.com/ifyoucanreadthis.htm

This in not religious spam, it a scientific look at information systems theory as relates to pattern vs. design in language. It is a lot to read, so I broke it down in my question, but it is well worth reading for anyone interested in evolution, from any viewpoint.

Please, I'm not looking for dogmatic answers of any persuasion, but a thoughtful response to a challenging question.

2007-08-05 15:46:06 · 5 answers · asked by MBC 4 in Biology

and how long to they last? Please try to be specific and list more than one flower.

2007-08-05 15:41:36 · 2 answers · asked by Irrelavant 3 in Biology

2007-08-05 15:41:27 · 6 answers · asked by Jessica O 1 in Biology

√x+7 + 5 = x

a) {9}
b) {2,9}
c) {9,18}
d) {2}

2007-08-05 15:39:18 · 6 answers · asked by Robby 2 in Mathematics

2007-08-05 15:37:54 · 6 answers · asked by shawn 1 in Mathematics

i know they hibernate all winter, but what happens the rest of the year, do they take naps or anything? if so do they sleep in the night time or day?..thanks.

2007-08-05 15:36:53 · 9 answers · asked by connnanza 2 in Zoology

what kind of bear is it? and why is he called "winnie the pooh"? cause they call him pooh bear like its his name, but wouldnt winnie be his name, and pooh be the kind of bear he is? is pooh a kind of bear or is he just a honey bear? yeah i know thats random as hell..but thats what happens in the moutains with no tv. lol thanks.

2007-08-05 15:34:24 · 6 answers · asked by connnanza 2 in Zoology

2007-08-05 15:32:38 · 1 answers · asked by Anonymous in Mathematics

It says to "write each division expression as a multiplication expression to find the quotient" 1/2 divded by 4/5 how the heck u do that

2007-08-05 15:30:27 · 11 answers · asked by Jamie 1 in Mathematics

the choices include beaker and graduated cylinder. which one is the right one?

2007-08-05 15:29:33 · 4 answers · asked by Anonymous in Biology

Five natural numbers D1,D2,D3,D4 and D5 ar such that their sum is odd. If the product of D3,D2 and D1 is odd and (D2D3+D3D4+D4D5) is not even , which of the following is true ?


(1)D4 is even , only if D5 is even

(2)D4 is always even

(3)D4 is always odd

(4)D4 is odd ,only if D5 is odd.


After some fight , i chose 1,3,5,7,11 which satisfies the conditions.

but while trying to choose the answer , i got stumbled because question has "if","always","only if" ....so not able to choose the answer.

How to solve this kind of problem ?

2007-08-05 15:27:20 · 1 answers · asked by calculus 1 in Mathematics

#1. Multiply (6t - 5)(6t + 5)

#2. Multiply and Simplify (3n)^6 * (3n)^7


Need answers to check my own work. Thanks

2007-08-05 15:25:57 · 5 answers · asked by Anonymous in Mathematics

Points Q, R, and S are on a line segment so that R is between Q and S. If QR = 4RS, what percent of QS is QR?

There are 28 students in a math class and 23 students in a chemistry class. If eight of these students take both math and chemistry, what is the ratio of the number of students taking only chemistry to taking only math?

2007-08-05 15:24:23 · 4 answers · asked by ? 2 in Mathematics

2007-08-05 15:20:47 · 5 answers · asked by Anonymous in Mathematics

Even using the formula I can't even get the right anwser this is none sense.
-b+/-√b²-4ac /2a

Prob.
-x²-8x+3=0

Solving.
x²+8x-3=0
-8+/-√64-4*1*-3/2

x=-8+/-√76/2

The anwser is totally wrong, how useless the formula is...

Complete the square.

(x+8/2)²-64/4=-3 +64/4
(x+8/2)²=52/4
(x+8/2)=2+/-√13/2
X=-8+/-√13/2

2007-08-05 15:14:12 · 6 answers · asked by Anonymous in Mathematics

2007-08-05 15:12:55 · 8 answers · asked by Anonymous in Mathematics

Please... I really need to know what the | means and how to solve?

2007-08-05 15:09:17 · 9 answers · asked by xrandomnessx 2 in Mathematics

I read that building a snow house (an igloo) sometimes saves the lives of Arctic researchesrs and trevelers because inside the igloo the temperature is 50 degrees higher than outside. I was wondering whether a similar temperature difference exists in hot climates when something is in shade and out of shade.

2007-08-05 15:08:29 · 9 answers · asked by Anonymous in Weather

2007-08-05 15:08:02 · 4 answers · asked by Anonymous in Weather

Is that a sad profession and would you go into it ?

2007-08-05 15:06:30 · 10 answers · asked by Anonymous in Medicine