Physics - June 2007

is this true according to the kinetic theory?

2007-06-12 01:42:34 · 2 answers · asked by Anonymous

A rose colored mineral specimen is given to you for identification. It has a conchoidal fracture, no streak, and a non-metallic luster. It has can be scratched with a steel file, but not with glass or a pocketknife blade. It has no streak. Its mass is 53 grams. you place it in water and it displaces a volume of 20 cubic centimeters of water.
A - What is the hardness of this mineral.? PLEASE Explain.
B - What is the specific gravity of this mineral?
C - Please Identify this mineral.

2007-06-12 01:37:10 · 6 answers · asked by Anonymous

2007-06-12 00:48:57 · 7 answers · asked by Anonymous

What are some devices that have been invented as a result of widespread use of AC electricity?

I already have induction cooktops and electric guitars, but a need one more.

One which works only with AC would be best, rather than one that CAN use DC but doesn't.

2007-06-12 00:42:32 · 3 answers · asked by Anonymous

2007-06-12 00:01:15 · 3 answers · asked by Mac Anthony M 1

2007-06-11 23:57:40 · 5 answers · asked by Mac Anthony M 1

Hello everyone,

I need to get some information about Rauss function or Rauss method. ( association with lagrange mechanics is prefered but anything will suite) Maybe there is another title for the same function because it´s hard to find anything about ¨Rauss¨ function on the web.

Thank you!!!

2007-06-11 23:33:32 · 1 answers · asked by Nooto 1

According to the theory of relativity, an object moving at the velocity of light has infinite mass.

But electrons in current carrying conductors pass at comparable velocities to light. Still their mass remains so small. Why?

2007-06-11 23:24:15 · 4 answers · asked by Karoly 2

my teacher said that this "c" is a five letter word that ends with a letter "r". please tell me what the word is.

2007-06-11 22:49:08 · 8 answers · asked by rachelle 2

heavier object is falling, naturally it's pulled to the earth with a greater force. what makes it fall at the same rate as a lighter body. i don't get why the acceleration due to gravity has to be sthe same for all bodies irrespective of their masses.

thanks:)

2007-06-11 22:38:10 · 6 answers · asked by tut_einstein 2

2007-06-11 22:33:56 · 8 answers · asked by ? 4

2007-06-11 22:24:16 · 3 answers · asked by jesse b 1

2007-06-11 21:13:00 · 3 answers · asked by Anonymous

if u r given exactly similar blocks , one iron and other magnet how would u tell which one is the magnet without the help of anything else..?........ answering this question could hav got me a job....

2007-06-11 20:59:58 · 6 answers · asked by Anonymous

2007-06-11 20:53:55 · 9 answers · asked by ozycattledog 2

I was researching telekinesis and I came across a something that said the earth would soon be moving into the fourth dimension and that everyone would be gifted with telekinesis. I don't have much background knowledge on dimensions and such.

2007-06-11 19:03:40 · 12 answers · asked by Sugarpie 1

TIME
Friday 13 October - Friday 3 November 2006 TBC
In this four-programme series, string theory pioneer Michio Kaku goes on an extraordinary exploration of the world in search of time.

1. DAYTIME
Time seems to drive every moment. It's the most inescapable force we feel.

2. LIFETIME
The most powerful effect of time on our lives is the way it limits us. Our knowledge of death is so embedded in our lives and spirituality that, were immortality possible, would we lose the sense that makes us human?

3. EARTH TIME
We hold a unique knowledge of time, realising that it stretches deep into the past, and will continue into the future. How does this affect our sense of who we are?

4. COSMIC TIME
We've always structured our lives based on an unchanging past and a predictable and ordered future. But atomic and cosmic discoveries have changed all that. What is time itself? And will it ever end? http://www.bbc.co.uk/bbcfour/documentaries/features/time.shtml

2007-06-11 18:24:22 · 4 answers · asked by sagarukin 4

Why do we think water is essential for life in other planets, just because it is so in earth? Why cant life happen with Hydrochloric acid or sulphuric acid?

2007-06-11 16:54:15 · 8 answers · asked by Karoly 2

will I be able to travel back in time? Will I be able to travel back in time only to be stuck there with no way home because the time machine doesn't exist yet?
What if it's portable? Won't it still have to run on something other than electricity, for going backwards?

2007-06-11 16:45:48 · 11 answers · asked by rebekkah hot as the sun 7

An electron with a velocity of 3.00E6 m/s [horizontally] passes through two horiizontal parallel plates. The magnitude of the electirc field between the plates is 120 N/C. The plates are 4.0 cm across. Edge effects in the field are negligible.
I dunno where to begin, please help :(

2007-06-11 16:21:51 · 1 answers · asked by Anonymous

How does the conservation of angular momentum apply to complicated rotations where the actual axis of rotation is itself rotating about a different axis? Aren't the rotations of Hyperion and 4179 Toutatis like this? If no torque acts on the system, are even these complicated rotations preserved in space? Or do they gradually simplify into simple single-axis rotations over a billion years or so?

http://en.wikipedia.org/wiki/Hyperion_%28moon%29
http://en.wikipedia.org/wiki/4179_Toutatis

2007-06-11 16:09:25 · 3 answers · asked by Anonymous

I need a container that is:
capable of holding up to 5 atmospheres without changing shape drastically
an opening large enough to fit a small apple
readily available and affordable

Thank you in advance for any help

2007-06-11 16:04:08 · 5 answers · asked by Unautrefois 2

The career and opportunities of physicist.. give me 5 examples

2007-06-11 15:48:51 · 4 answers · asked by tHeo 2

2007-06-11 15:34:02 · 2 answers · asked by James G 1

Magnetic vs. Electrical force?

2007-06-11 15:03:24 · 2 answers · asked by Anonymous

Explain without using math formulas if possible.

2007-06-11 14:40:12 · 8 answers · asked by Lobster 4

list 5 facts about the Big Bang.

2007-06-11 11:22:39 · 7 answers · asked by :) 5

Have you ever thought being that we leave in a three dimensional, it seems next to impossible to imagine one dimension.

We can think on two dimensional terms, like a picture on the television or a picture printed in a book. Even a picture, not a print, painted in a canvas is not truly two dimensional seeing that the paint itself have some dimension to it , so technically it's three dimensions, even if not perceived by the human eye.

What really is interesting is the concept of one dimension. It usually is represented by a line. But, wouldn't this line have to be infinitesimally small as not to have two dimensions. Being that a line no matter how small still has two dimensions, the thickness of the line. Even if it is too small for the eye to see, there has to be two dimensions to it, if it is a line.

So, do you think that one dimension can really exist in a three dimensional world or do you think it just exists as a theoretical concept?

2007-06-11 10:32:08 · 10 answers · asked by Anonymous

A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.40 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.90 107 J at lift-off. What is the work done on the jet by the catapult?

Tried two different ways and both were wrong.....what am i doing wrong

Thrust*Distanc+Wc*D=Ke
2.40*10^5*87+Wc*87=4.90*10^7J
Wc=2.347

1st attempt
W=Chane Kinetic Energy
Wc=Fs=(2.40*10^5)87=20880000J
Wc=323218.391

2nd attempt
We+Wc=change KE
Wc=2.347
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Additional Details
2 minutes ago
For the response
The KE at lift of is 4.9x10^7, meaning that 2.612x10^7 J comes from the catapult.
how did you get the 2.612X10^7<

2007-06-11 09:52:23 · 2 answers · asked by wildcherrychica1 2

A car is up on a hydraulic lift at a garage. The wheels are free to rotate, and the drive wheels are rotating with a constant angular velocity. Does a point on the rim of wheel have (a) tangential acceleration and (b) centripetal acceleration? In each case, give your reasoning.

is this considered nonuniform circular motion because the tangential speed changes? So wouldnt there be both tangential and centrepetal accleration at all points on the rim?

2007-06-11 09:39:01 · 3 answers · asked by Kel 1