Science & Mathematics - 1 November 2006

Three identical train cars, coupled together, are rolling east at 2.0 m/s. A fourth car traveling east at 4.0 m/s catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples to make a five-car train. What is the speed of the five-car train?

2006-11-01 15:01:21 · 3 answers · asked by Anonymous in Physics

I get an answer of 11.2 rev/min and this could be the problem to me obtaining the proper answer or it could be my conversions. please help!

A playground merry-go-round of radius 2.00 m has a moment of inertia I = 230 kgm2 and is rotating about a frictionless vertical axle. As a child of mass 25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rotates at the rate of 14.5 rev/min. The child then proceeds to walk toward the edge of the merry-go-round. What is the angular speed of the system when the child reaches the edge?

2006-11-01 15:00:24 · 4 answers · asked by Anonymous in Physics

I'm drawing a blank on this...

how do I get the number of moles of H20 produced in a rxn of 50 mL of 1.0M HCl and 50mL of 1.0M NaOH?

any help is appreciated:)

2006-11-01 14:58:46 · 5 answers · asked by Anonymous in Chemistry

What is the half-life of zirconium-86?

a.) 4 hours
b.) 16.5 hours
c.) 22 hours
d.) 8.2 hours

2006-11-01 14:57:44 · 2 answers · asked by Anonymous in Chemistry

2006-11-01 14:56:08 · 4 answers · asked by Cecil v 1 in Biology

For example, instead of adding two drops of indicator 20 are added...

2006-11-01 14:55:17 · 4 answers · asked by Nuna 3 in Chemistry

Suppose you tell a friend about the many trillions of neutrinos that pass through our bodies every second. Your friend becomes alarmed about this and buys a leadvest for protection.

a)What would you tell your friend to ease his fear of neutrinos?

b)If your friend is still worried, what else could you tell your friend to convice him to return the lead vest to the store and get his money back?

2006-11-01 14:54:36 · 6 answers · asked by amy 1 in Biology

a.) beta
b.) alpha
c.)x-ray
d.) omega

2006-11-01 14:53:33 · 3 answers · asked by Anonymous in Chemistry

The big bam is what scientests belive what made the universe and what I mean by static is when you have a fuzzy screen on the tv or when you turn on the radio and you hear a zzzzzzzzzzz.

2006-11-01 14:53:19 · 2 answers · asked by smart smart. 3 in Astronomy & Space

Four candidates run for president of the student council. Three other candidates run for vice-president. How many different ways can the two offices be filled?
Don't get it. HELP

2006-11-01 14:53:05 · 5 answers · asked by hao a 1 in Mathematics

How are radiowaves, xrays red blue and gren light similar and how are they different.

2006-11-01 14:52:21 · 3 answers · asked by John L 1 in Physics

what is the specific gravity?
is it have any unit?
how can we explain it in laymen way and technical/detail way

2006-11-01 14:51:56 · 1 answers · asked by MTT 1 in Physics

Ten points for the first correct answer.

2006-11-01 14:51:40 · 8 answers · asked by Mike S 7 in Mathematics

(I know that someone else did one w/ the same title, but this one is different)
Aside from piercings, what is the purpose of earlobes? Note: I'm talking aboutthe fleshy part of it that hangs down. I know the rest of it is to amplify sound, but I'm talking about the part usualy used for earrings.

2006-11-01 14:51:03 · 8 answers · asked by ldnester 3 in Biology

222Rn ------> 218Po + ______

a.) an alpha particle
b.) a beta particle
c.) a hydrogen atom
d.) a neutron

2006-11-01 14:50:42 · 3 answers · asked by Anonymous in Chemistry

Ten points to the first correct answer.

2006-11-01 14:50:16 · 17 answers · asked by Mike S 7 in Mathematics

Mars...

2006-11-01 14:49:06 · 8 answers · asked by busterp 3 in Astronomy & Space

2006-11-01 14:48:37 · 1 answers · asked by deb r 1 in Earth Sciences & Geology

2006-11-01 14:48:29 · 4 answers · asked by rodolfo v 1 in Astronomy & Space

In the first derivative test; If we only have one critical number, do we have an inflexion point or we don't?

2006-11-01 14:47:24 · 4 answers · asked by alanis118 1 in Mathematics

I am doing a project where we make a vehicle that has to go 1 m and follows newton's third law. I cannot be moved by electricity, wind, fire, or a human hand. Any help? Designs?

2006-11-01 14:45:01 · 3 answers · asked by JeffK 1 in Physics

2006-11-01 14:44:46 · 10 answers · asked by curiousdan 2 in Earth Sciences & Geology

I know it looks easy but my math teacher says we have to do it a special way, cut my some slack I am only 12 and yes this is supposed to be advanced. So here is how I have to do the problem.

x-6=-25
x-6+6=-25+6
x=

2006-11-01 14:44:03 · 5 answers · asked by Blondie 1 in Mathematics

Do they co-exist or are they in separte parts of the world?
Thanks, john

2006-11-01 14:43:34 · 6 answers · asked by John C 1 in Zoology

This is for all of those people who think that they are a piece of bread.

2006-11-01 14:43:31 · 8 answers · asked by THE DUDE 1 in Mathematics

1)When photographs are taken of the Sun in ultraciolet light, the Sun appears to be slightly larger in diameter than it appears in visible light photographs. Why is this?

2)Explain why our Sun is able to exhibit "diggerential rotation," while it is inpossible for the Earth to rotate in such a manner.

2006-11-01 14:42:25 · 2 answers · asked by amy 1 in Astronomy & Space

2006-11-01 14:41:03 · 16 answers · asked by Kylee 1 in Astronomy & Space

Find the points on the graph of y=sec x , 0>(or equal to)x>(or equal to)2pi, where the tangent is parallel to the linde 3y-2x=4

2006-11-01 14:40:35 · 3 answers · asked by venom90011@sbcglobal.net 1 in Mathematics

2006-11-01 14:35:11 · 2 answers · asked by spiked 1 in Botany

I need to find the definite integral between 3 and -2 (i don't know how to make the integral sign on here) (x^4 - 9x^3 + 7x^2 - 3x +1)dx

my friends and i have tryed this a bunch of times and for some reason we keep getting different answers. So please help?!

2006-11-01 14:34:58 · 5 answers · asked by iamthehandcuff 1 in Mathematics