Science & Mathematics - 13 September 2006

im doing homework and id like to know the history of the number 15, eg. origin, who invented it and stuff. it would be great if you could answer

2006-09-13 06:17:15 · 8 answers · asked by ? 3 in Mathematics

I am a fresh MSc mechanical engineer with good research resume.

2006-09-13 06:16:55 · 2 answers · asked by saeed f 1 in Engineering

2006-09-13 06:15:48 · 29 answers · asked by jennifereccles_uk 3 in Astronomy & Space

2006-09-13 06:12:23 · 12 answers · asked by Mark E 1 in Physics

2006-09-13 06:09:52 · 3 answers · asked by harvinderdevgan 1 in Engineering

A train of mass 55,200 kg is traveling along a straight level track at 26.8 m/s (60.0 mi/h). Suddenly the engineer sees a truck stalled on the tracks 184 m ahead. If the maximum possible braking force has magnitude 84.0 kN, can the train be stopped in time?

No; it takes 236 m for the train to stop.
Yes; it takes 52 m for the train to stop.
No; it takes 1180 m for the train to stop.
No; it takes 184 m for the train to stop.

2006-09-13 06:09:11 · 3 answers · asked by Anonymous in Physics

Does anyone have a manual or something from where to learn the basics about circuit theory?Or give me a link (I prefer it to have some exercises based on the theory) from where to learn..Thanks..

2006-09-13 06:08:12 · 4 answers · asked by PanK 1 in Engineering

2006-09-13 06:06:58 · 7 answers · asked by george h 2 in Other - Science

In a tug-of-war between two athletes, each pulls on the rope with a force of 999 N. What is the tension in the rope? What is the absolute value of the horizontal force that each athlete exert against the ground?

2006-09-13 06:06:07 · 4 answers · asked by Anonymous in Physics

find the angle in standard position of smallest possible measure whose terminal side contains P(-2,2)

how do i do this?

2006-09-13 06:03:50 · 2 answers · asked by iluvhipos 3 in Mathematics

2006-09-13 06:02:06 · 5 answers · asked by Shawn249900 2 in Astronomy & Space

thanks

2006-09-13 05:58:53 · 5 answers · asked by ads 1 in Biology

Linear Alebra

2006-09-13 05:56:42 · 1 answers · asked by Dikshit 1 in Mathematics

with only a horizontal component of velocity. He is standing 4.5 m below her window and 5.0 m from the base of the house. How fast are the pebbles going when they hit the window???

2006-09-13 05:55:49 · 3 answers · asked by bulldawg771 1 in Physics

If that same volume of water was ice, they'd surely be dead as they wouldn't be able to cope with the weight, but why is this not the case when totally submerged in water.

2006-09-13 05:55:07 · 21 answers · asked by Anonymous in Physics

I can only think of one answer. As the zygote grows, a somatic cell mutation occours in one of the cells which will eventually continue to divide forming the left eye. This line of mutant cells could have a different pigmented protein which colours the iris-making the "mutant-eye" green. The other eye however developed from a normal cell line without the mutation making it blue.

That's the only answer I can find... but the probability of this occouring must be small since a mutation like this would be rare. But this is'nt that rare a condition.

2006-09-13 05:53:56 · 13 answers · asked by theBoyLakin 3 in Biology

Please tell me if these are true or false. Only tell me if you are definatly sure. Ta!!!
1.Catalysts are specific to certain reactions.
2.Reations slow if catalysts are used.
3.Enzymes increase the activation energy.
4.Reactions slow down if diluted.
5.Inreasing concentration increases the rate of reaction.
6.Pressure increases the rates of gaseous reactions.

2006-09-13 05:39:55 · 33 answers · asked by PeachyPies 3 in Chemistry

2006-09-13 05:39:26 · 5 answers · asked by Mz. LoLO 1 in Chemistry

2006-09-13 05:36:03 · 40 answers · asked by rochelle 1 in Zoology

2006-09-13 05:33:32 · 7 answers · asked by Joan09 1 in Biology

this would then use the wind to turn a fan,producing electricity for say the lights or other electrical appliances.

2006-09-13 05:32:32 · 18 answers · asked by Richie D 1 in Engineering

2006-09-13 05:31:31 · 4 answers · asked by Joan09 1 in Biology

This forming a Magnetic Shield,would this stop solar winds,radiation from space and help speed the craft?

sorry if not spelt right

2006-09-13 05:27:16 · 12 answers · asked by Richie D 1 in Astronomy & Space

2006-09-13 05:23:53 · 6 answers · asked by krisy m 1 in Astronomy & Space

2006-09-13 05:21:16 · 9 answers · asked by bobbyintellectual 1 in Other - Science

2006-09-13 05:19:11 · 2 answers · asked by ruchika j 1 in Medicine

The class is Signals and Systems (LTI) and the term project should involve MATLAB. Any ideas???

2006-09-13 05:17:54 · 2 answers · asked by Paco 211 2 in Engineering

i just wondering; no matter what color you wear, your shadow is always in black?

2006-09-13 05:14:47 · 11 answers · asked by btribuwono 1 in Physics

2006-09-13 05:09:49 · 18 answers · asked by pookeysmum 1 in Earth Sciences & Geology

In terms of prevailing winds and air pressure, explain why most
weather patterns in the United States begin in the west, yet most hurricanes affect only the eastern states. (Hint: Most hurricanes begin off the western coast of Africa.)

Given that the tropical region retains more heat energy than is
released to space, and the polar regions release more heat energy
than they receive, explain why the tropical region hasn't burned up and
the polar regions have not become increasingly colder.

2006-09-13 05:06:52 · 2 answers · asked by maconheira 4 in Geography