Science & Mathematics - 13 October 2006

Your hair must be completely dry before you use a curling iron on it, as it will boil the water molecules in your hair and ruin it.

2006-10-13 14:01:39 · 4 answers · asked by greenfrogs 7 in Physics

You could have a dream that seems to take for ever but once waking up that dream was only minutes long. Is time dilation taking place? In the dream everything was moving in a normal manner and not in fast forward or slow motion.

Was 1 second in the dream a hundredth of a second in the real world?

2006-10-13 14:00:54 · 3 answers · asked by aorton27 3 in Mathematics

Imagine you have a bird, flying directly north. The sun is shining directly east (from the west). There is a wall to the east of the bird which runs at 45 degree angle so that as the bird flies forward it's perpendicular distance from the wall increases (e.g. running south-west to north east). So, as the bird flies north, it's shadow moves up the wall, going north at exactly the same speed. But because the wall is at an angle, the shadow is actually moving a greater distance than the bird in a set amount of time. So, the shadow is moving faster than the bird by a certain ratio. Now imagine that (somehow) this bird could travel at the speed of light. The shadow would therefore be travelling faster than the speed of light.

2006-10-13 14:00:24 · 11 answers · asked by BabyMD 2 in Physics

function s(t) = (t^2.2t+8)^0.5
point (2,4)


thanks

2006-10-13 13:56:10 · 4 answers · asked by sandyclaws08 2 in Mathematics

A power supply for a transistor amplifier develops an output of 25V at 2.4A. If the overall efficiency of the power supply is 80%, what input current will it draw from a 120 volt source?

2006-10-13 13:56:00 · 5 answers · asked by element69ca 1 in Engineering

2006-10-13 13:52:58 · 1 answers · asked by Anonymous in Physics

I know that there is freefall, which the gravity is constantly pulling the astronauts down. But how come they dont actually fall in?

On Earth, if you jump off froma plane, you can fell weightless, but you are actually falling down and you will die if you don't land properly.
How come the situation is different from the situation in space?

And how come the satalite can move faster than earth's rotation, if you say it is just keep falling toward the Earth?

(Tell me if you don't get what I am saying)

2006-10-13 13:49:33 · 6 answers · asked by help_our_health 1 in Physics

2006-10-13 13:49:17 · 12 answers · asked by Anonymous in Biology

2006-10-13 13:48:25 · 26 answers · asked by militarydata 1 in Zoology

2006-10-13 13:48:24 · 20 answers · asked by j a 1 in Mathematics

2006-10-13 13:44:28 · 13 answers · asked by Chris M 2 in Astronomy & Space

i just had surgery and my daughter asked me this.
so if i robed a bank and left blood evidence and you donated blood would your blood DNA evidence be there?

just curious i did not get blood nor am i going to rob a bank.
thanks

2006-10-13 13:44:12 · 4 answers · asked by blackrealty 3 in Medicine

2006-10-13 13:40:17 · 13 answers · asked by Chris M 2 in Astronomy & Space

2006-10-13 13:39:56 · 3 answers · asked by Anonymous in Mathematics

2006-10-13 13:39:29 · 2 answers · asked by bartrmsy 1 in Other - Science

slides on a horizontal frictionless surface with a speed of 1.4 m/s. It is brought momentarily to rest when it hits a bumper that compresses a spring. Acceleration of gravity is 9.8 m/s^2.

How much is the spring compressed if its force constant is 8 kN/m? Answer in units of m.

2006-10-13 13:39:20 · 1 answers · asked by Mariska 2 in Physics

This question is based on the "Speed of light?" question that was asked some minutes ago. I would like to know if, say, there is an atom travelling at speed of light in a vacuum, how can it gain mass if everything around it is nothing but empty space? Does this mean that space can transform into matter? I'm confused!

p.s. Sorry if my question sounds kind of ignorant but I'm really interested in physics and am considering this field for college.

2006-10-13 13:35:33 · 4 answers · asked by Anonymous in Physics

considering that i have all the proper lab equipement...i want ideas not whether or not if its really hard...

2006-10-13 13:33:41 · 3 answers · asked by anikabot 2 in Biology

2006-10-13 13:19:27 · 13 answers · asked by Anonymous in Astronomy & Space

2006-10-13 13:17:52 · 11 answers · asked by moocow50000 1 in Biology

A mixture of Ne and Ar gases at 351 K contains twice as many moles of Ne as of Ar and has a total mass of 47.0 g. If the density of the mixture is 4.17 g/L, what is the partial pressure (in atm) of Ne?

2006-10-13 13:12:42 · 2 answers · asked by thewhite_stag 1 in Chemistry

2006-10-13 13:10:25 · 6 answers · asked by Anonymous in Mathematics

People often discuss objects that are in the universe such as wormholes, planets, supernovas and much more....... But what consists outside of the universe?

2006-10-13 13:06:56 · 15 answers · asked by Ahmed M 2 in Astronomy & Space

Please provide proof if you can.

2006-10-13 13:03:40 · 13 answers · asked by crazydribbler 1 in Astronomy & Space

2006-10-13 13:01:06 · 5 answers · asked by M.H. 1 in Biology

2006-10-13 12:59:57 · 5 answers · asked by shimafive 1 in Engineering

2006-10-13 12:54:54 · 8 answers · asked by ast5792 1 in Astronomy & Space

A sample of zinc metal was reacted with an excess of hydrochloric acid.


Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)




All of the zinc reacted, and the hydrogen gas was collected over water at 24C; the barometric pressure was 755 mmHg. The level of water inside the tube was 31.0 cm above the level outside the tube. If the volume of gas in the tube is 21.4 mL, how many grams of zinc were there in the sample? The density of Hg is 13.596 g/mL and the density of water is 1.000 g/mL.

2006-10-13 12:54:52 · 2 answers · asked by thewhite_stag 1 in Chemistry

And that outer-outer space most be infinite, for outer space to form into it?
And does any one know the real name for outer-outer space?
Would it be considered non existence, and if so how does a point of singularity form from no existence.

2006-10-13 12:54:19 · 12 answers · asked by Anonymous in Astronomy & Space

(each costing the same).each round table can seat 8 people and each rectangle table can seat 12 people.how many round and rectangle tables should you rent? explain
its a problem solving using linear systems.

2006-10-13 12:53:58 · 6 answers · asked by Anonymous in Mathematics