Science & Mathematics - 4 December 2007

Uhm here's the problem: A train left the station at 9 am traveling at 50 mph. AT 11 pm, an airplane left the same place in the same direction at 175 mph. AT what time will the plane overtake the train? Can someone also tell me the steps? Thankshoo. :*

2007-12-04 21:26:20 · 7 answers · asked by Danie... ;) 1 in Mathematics

2007-12-04 21:24:50 · 1 answers · asked by Sarah Giselle A 1 in Botany

I'm trying to learn math n I don't even have a teacher......

That is hard!

- 3(2x + 10) = 5(6x – 5) + 10

Distribute:

6x - 30 = 30x - 25 + 10

Ooh I see now put the x numbers on the left.

36x =

But what about the 30 on the left side....so confusing! I don't get it yet. Can u teach me pls.

2007-12-04 21:23:23 · 10 answers · asked by o0♥0o 1 in Mathematics

which is the correct word to be used in this sentance?
The density and quality of vegetation will vary at different times of the year due to changes in _ _ _ _ _ _ _ _?
weather or climate?

2007-12-04 21:18:50 · 4 answers · asked by Thomas C 1 in Weather

2007-12-04 21:18:48 · 3 answers · asked by black beauty 1 in Agriculture

2007-12-04 21:16:24 · 2 answers · asked by Chris W 1 in Mathematics

ic package SOT-23 and TO-92

What's the full name of SOT and TO?

Where does these digits come from? made from engineering society?

2007-12-04 21:04:40 · 4 answers · asked by Anonymous in Engineering

2007-12-04 20:58:21 · 16 answers · asked by blessedboy 1 in Astronomy & Space

some people say this is a myth, but this makes sense as some tumors become malignant for some reason at some point. So if biopsy shows the tumor is benign u will have to repeat this biopsy (every month? as some malignant cancers can kill within 3 months like thyroid anaplastic cancer) to make sure it did not get malignant yet - so what's the point in this procedure unless u actually have malignant cancer in the first place?

2007-12-04 20:55:42 · 8 answers · asked by Anonymous in Medicine

2007-12-04 20:52:07 · 0 answers · asked by shin shin yameba 1 in Biology

And I was behind the moon, with the right timing to put the earth in between the moon and the sun, so the moon fit perfectly in between. (just look at the picture)

What does this tell you about the universe and the singlarity of everything?

http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=spacejack.jpg

2007-12-04 20:46:41 · 6 answers · asked by Anonymous in Astronomy & Space

Use differentials to estimate the amount of tin in a closed tin can with diameter 6 cm and height 12 cm if the tin is 0.012 cm thick.

Please show ALL work.
Correct answer is 3.39 cm^3.

I need to know how to ARRIVE at the answer.

2007-12-04 20:13:47 · 1 answers · asked by Anonymous in Mathematics

A 100 g ball is attached to a rubber tube and is spun around in a circle at a rate of one revolution every second. A force of 0.5 N is required to stretch the tube 1.0 cm.
(a) If the original length is L = 1.0 m, what will be the change in length of the rubber tube when the ball is revolving?
(b) How much energy do you expend to bring the ball off the ground to a height of 2.5m and then get it swinging at a rate of one revolution every second? Neglect the mass of the rubber tube.

2007-12-04 20:09:29 · 3 answers · asked by irinka0819 1 in Physics

Hi
can I find online info on psychology and parapsychology?
I am preparing for exams, hence seeking info

2007-12-04 20:02:42 · 6 answers · asked by :) 1 in Parapsychology

2007-12-04 19:59:55 · 11 answers · asked by Abbie 1 in Zoology

This is a question I have for class. All i know is that the moon's gravity is 1/6 of the earth's.

2007-12-04 19:58:30 · 13 answers · asked by Anonymous in Astronomy & Space

2007-12-04 19:53:05 · 7 answers · asked by Anonymous in Mathematics

A guy welding together a large cube using angle iron for the edges notices that the cube is not very rigid. So he decides to weld on some diagonal braces, going from any one corner to another. How many braces does he need to make the cube rigid?

2007-12-04 19:42:08 · 6 answers · asked by Scythian1950 7 in Engineering

2007-12-04 19:41:41 · 6 answers · asked by Jennifer L 1 in Mathematics

i used to have one but it wasn't all that great. i am looking for one that i can use around and take to gazing parties. and that is powerful enough to really make out details of what i am looking at. also like to get filters so i can look at the sun, and a good camera to take photos of things i see. any help will be good and appreciated

2007-12-04 19:27:23 · 10 answers · asked by SA Warlock 3 in Astronomy & Space

Where is it and how close to absolute zero is it?

2007-12-04 19:11:54 · 9 answers · asked by ? 4 in Astronomy & Space

Perform this operation

2007-12-04 19:02:21 · 3 answers · asked by monkeybrat12006 1 in Mathematics

A 70kg diver steps off a 10m tower and drops, from rest, straight down into the water. If he comes to rest 5.0m below the surface, determine the average resistance force exerted on him by the water.

I'm pretty much bamboozled. If you could include the steps to get the answer, that would be awesome!
Thanks!

2007-12-04 18:59:04 · 1 answers · asked by mew1033 2 in Physics

for (4+x^2)^(1/2) or sqrt(4+x^2)
write at least 6 terms...

2007-12-04 18:55:02 · 1 answers · asked by ryannnnn 1 in Mathematics

I need a knee replacement, but the Dr's say I'm not 60 they say I'm to young for a knee replacement ( as knee replacement parts have a minimal part which in my case will only last 10 years ), My knee is bone on bone. so they are holding off. I'm just wondering some one has made a lotion or a potion or what ever that will help me with my knee's. As my life is on hold I can't walk distances, dance or even kick a ball with my grandchildren. I on fosamax,celebrex, panadol, nuroforn, fishoil ,glucosamine and osteroEzeThank you

2007-12-04 18:52:38 · 5 answers · asked by Kaye B 6 in Medicine

2007-12-04 18:50:53 · 2 answers · asked by Anonymous in Mathematics

2007-12-04 18:50:26 · 2 answers · asked by Anonymous in Mathematics

also let me know the dimensions like the depth accountablility for expansion contraction e.t.c

2007-12-04 18:49:19 · 3 answers · asked by vijay k 3 in Astronomy & Space

I seem to be having huge difficulties with setting up a probability transition matrix for a Markov chain. I'm not sure where to start or what to do, especially if it's beyond basic.

For example, how would I construct a matrix for:
Suppose that if it has rained for the past 3 days, then it will rain today with probability 0.8; if it did not rain for the past 3 days then it will rain today with probability 0.2; and in anyother case the weather today will, with probability 0.6, be the same as the weather yesterday.

I just can't seem to wrap my head around how to do this...

2007-12-04 18:34:16 · 1 answers · asked by yogastar02 2 in Mathematics

I'm stuck on this problem. I don't know how to do it! Please show the steps.
Thank you!

The launching mechanism of a toy gun consists of a spring of unknown spring constant. If its spring is compressed a distance of 0.120 m and the gun fired vertically as shown, the gun can launch a 20.0 g projectile to a maximum height of 20.0 m above the starting point of the projectile.

(a) Neglecting all resistive forces, determine the spring constant.

(b) Neglecting all resistive forces, determine the speed of the projectile as it moves through the equilibrium position of the spring (where x = 0)

2007-12-04 18:27:17 · 3 answers · asked by mew1033 2 in Physics