Science & Mathematics - 14 November 2007

2007-11-14 05:12:06 · 4 answers · asked by Adam R 1 in Earth Sciences & Geology

Is it possible to conduct electrolysis experiments with the 120V mains? I'm sure that if I do that carefully, I'll get a rather good yield of H2 and O2 with the water...

2007-11-14 05:07:34 · 2 answers · asked by Anonymous in Chemistry

Two billiard balls of equal mass undergo a perfectly head-on collision. If one's ball initial speed was 2.00 m/s and the other's was 3.00 m/s in the opposite direction, what will be their speeds after the collision?

2007-11-14 05:06:52 · 4 answers · asked by Rasheena E 1 in Physics

How do you differentiate Sin[x^2]?
i.e. NOT (Sin[x])^2, but with the square operator actually part of the argument of sine.

2007-11-14 05:04:44 · 3 answers · asked by Rob H 4 in Mathematics

A simple pendulum consists of 3.1 kg point mass hanging at the end of 2.0 m long light string that is connected to a pivot point.
Calculate the magnitude of torque, due to the force of gravity, around this pivot point when the string makes a 2.8degree angle with the vertical. Accleleration of gravity is 9.81 m/s^2. Answer in units of N m.

What would the calculation be for a 19.9degree angle? Answer in units of N m.

2007-11-14 05:03:23 · 3 answers · asked by Anonymous in Physics

Any info. explaining special relativity would be great, thanks.

2007-11-14 04:57:53 · 6 answers · asked by kano7_1985 4 in Physics

2007-11-14 04:56:07 · 12 answers · asked by Laurie C 1 in Astronomy & Space

signs discovered in images?

2007-11-14 04:55:47 · 5 answers · asked by terethian 1 in Astronomy & Space

A closed cardboard box measuring 7 by 14 by 5 is filled full with 1 by 1 by 1 sugar cubes. How many of these 490 sugar cubes touch the box with at least one face?

2007-11-14 04:54:33 · 13 answers · asked by richard s 2 in Engineering

2007-11-14 04:53:17 · 9 answers · asked by Anonymous in Geography

2007-11-14 04:49:09 · 30 answers · asked by becca w 1 in Earth Sciences & Geology

How do I put y=(x-2)^2-4 in the form y=ax^2+bx+c
Thanks for any help.

2007-11-14 04:39:20 · 5 answers · asked by Anonymous in Mathematics

What is the innermost layer that the bullet has penetrated?
1. skin (i'd say not to that)
2. bone (i'd say no to that as well)
3. fat
4. periosteum

2007-11-14 04:36:18 · 5 answers · asked by fukitol1215 1 in Medicine

yeaaaaaah

2007-11-14 04:36:17 · 4 answers · asked by lex t 2 in Biology

1) Always polar.
2) Always non Polar
3)Depending on the arrangement of outer atoms, this molecule could be polar or nonpolar.

2007-11-14 04:36:03 · 3 answers · asked by Anonymous in Chemistry

2007-11-14 04:33:51 · 13 answers · asked by Adam R 1 in Astronomy & Space

A pupil measured the angles in a tringle.
she said:

The angles are 30 degrees, 60 degrees and 100 degreees

Could she be right ?
YES or NO

Explain your answer.

2007-11-14 04:30:37 · 10 answers · asked by Anonymous in Mathematics

1)
x-5y=32
-3x=y

2)
x-y=8
3x+2y=-1

Thanks in advance!

2007-11-14 04:23:16 · 4 answers · asked by Justin K 1 in Mathematics

Final solutions are provided but please show the method:

A work crew for a building project is to be made up of two craftsmen and four laborers selected from a total of five craftsmen and six laborers.
a. How many different combinations are possible? (ans:150)
b. The brother of one of the craftsmen is a laborer. If the crew is selected at random, what is the probability that both brothers will be selected? (ans: 0.2667)
c.What is the probability that neither brother will be selected? (ans: 0.20)

2007-11-14 04:21:59 · 4 answers · asked by Albert A 2 in Mathematics

I need to show that fn(x)=cos(x/n) converges uniformly to f(x)=1 for x in [0, pi]. I need help finding an n from the inequality
|cos(x/n) - 1| < eps

Thanks...

2007-11-14 04:21:26 · 2 answers · asked by linzaroo06 1 in Mathematics

2007-11-14 04:19:58 · 23 answers · asked by peter john maloy 1 in Geography

2007-11-14 04:16:47 · 1 answers · asked by Anonymous in Botany

2007-11-14 04:16:37 · 4 answers · asked by hayhay_unlimited 2 in Earth Sciences & Geology

The given function is f(x) = -3x(squared) + 12x + p.
- At which p does point (p, 14) lie on the graph of f?

The subject is quadratic relationships. I know that I either have to use the quadratic formula in some way, but I don't know how, as p is also in the x and y coordinates.

And please, no stupid comments like ' do you homework yourself '. It's study : )


Thanks a lot!

2007-11-14 04:16:17 · 5 answers · asked by pallasfield 2 in Mathematics

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

2007-11-14 04:14:16 · 3 answers · asked by emma 1 in Mathematics

2007-11-14 04:06:56 · 2 answers · asked by OmegaAsh 1 in Physics

(a) How much work does an elevator motor do to lift a 920 kg elevator a height of 84 m?
J
(b) How much power must the motor supply to do this in 44 s at constant speed?
W

2007-11-14 04:06:28 · 1 answers · asked by Jim E 1 in Physics

Also what is the purpose of a welding transformer ?

2007-11-14 04:06:16 · 3 answers · asked by weedly76 2 in Engineering

Is International Affairs similar to studying Regional Geography?...
I wanted to study Regional Geography, concentrate on Italy's affairs with us (U.S), work for the govt. but I am sacrificing majoring in Geography to go to my dream school, even though it does not offer Geography, but I figured International Affairs is similar, as both have a little Political Science; history; anthropology; Geography; culture, in them *and can be a diplomat as a career when graduated. But is this true or what?..Deep down inside I'd love to say Geography is my major, but a sacrifice had to be made, I've concentrated on getting credits transfered to this school, *I don't want to go back to square one again.

2007-11-14 04:05:20 · 2 answers · asked by Anonymous in Geography

2007-11-14 04:03:36 · 5 answers · asked by Anonymous in Mathematics