Physics - September 2007

I have to do a breif presentation over Heisenberg's uncertainty principle, and unfortunatley it is way to complicated for me to understand. She gave us 2 days to research it and i dont know what im doing. What i would like from you guys, if you would be so kind, is a simple explanation, in your own words, so no plaguerizing is going on, as to what his uncertainty princple says. Also, a link to a webpage with a proof of his theory, and some of the problems with his theory. If any of you could provide me with any or all of these answer it would be so awesome!

2007-09-17 02:45:22 · 5 answers · asked by buckeyefan1191 3

if a rigid body is rotated about a fixed axis , prove that the curl of the linear velocity 'v' of a point on the body is equal to twice the angular velocity...

2007-09-17 02:23:15 · 1 answers · asked by goerge 1

2007-09-17 02:20:04 · 7 answers · asked by Anonymous

2007-09-17 02:11:16 · 8 answers · asked by Anonymous

2007-09-17 01:51:09 · 3 answers · asked by Marcus 1

Under which conditions should indistinguishability of particles in a quantum gas be taken into account?

And why this affects the energy distribution of the gas

ps: this is on an old exam paper. I said that the DeBroglie wave length should be approximately equal to the spacing between the atoms, but the energy distribution bit. I'm stumped

2007-09-17 01:28:04 · 1 answers · asked by   4

The time of passage of a ball rolling on an inclined plane is measured by 3 light gates positioned 60 cm apart. The ball passes the light gates at .30, 1.15, 1.70 seconds. what is the acceleration of the ball?
I am not sure how to approach this probelm. Please help explain the steps to get to the answer.

2007-09-17 00:52:06 · 2 answers · asked by Anonymous

can u give me a syt that i can get their researches and papers!!!!

reason: because im doing a research (phD) and i really need 'em!

2007-09-17 00:47:09 · 3 answers · asked by TRUE-NERDY-BOY 1

I know they're force carriers. Which force in particular are they involved with. If I were to remove them from an atom, what would this do to it?

2007-09-17 00:08:02 · 1 answers · asked by Bob B 7

I am asking this question third time.....and yet i m not satisfied.......so plz give me genuine answer

2007-09-17 00:05:39 · 2 answers · asked by Anonymous

its for my GCSE at college

2007-09-16 23:49:24 · 23 answers · asked by Anonymous

Shrek have 2 spaceships. Ship "1" flying in a speed of 0.84c (c- speed of light). Ship "2" is faster than ship "1" (no one is actually flying in the speed of light).
Shrek also have 2 machines. A food machine (1) and a drink machine (2). He want to activate both the machines and that they will finish their work simultaneously and beside him.
The "normal" time it takes the food machine to work is 2.7hours , while the washing machine takes 3.28h.
(a)What Shrek need to do with himself and the machines ,so he could wait as little time as possible combine with the machines finishing their work simultaneously (meaning who will be on earth and who will be on the ships).
(b) how much time will pass on Shrek during the above events.
(c)Using Lorentz transformation, how much time it takes (from the view of the one who stayed on earth-Shrek, or one of the machines) the ships to turn around meaning stopping moving forward and starting heading back

2007-09-16 23:37:59 · 3 answers · asked by riverdancer 1

physics hw questions....
Can you feel the inertia of a pencil? of a book?

thank you.

2007-09-16 20:47:25 · 5 answers · asked by JewishLady 1

...Why all objects fall at the same rate in a vacuum? Also, which of Newton's Laws does this relate to?
Thanks in advance!

2007-09-16 20:29:50 · 6 answers · asked by CassC 1

the one you make when you go out and move around with each other

2007-09-16 20:27:30 · 1 answers · asked by Anonymous

what is the basic priniciple of fucntion of a thermo-baric bomb

2007-09-16 20:22:58 · 4 answers · asked by Anonymous

Is there any way to tell if a quantum particle is in a definite state or a superposition of states before a measurement is made?

Another words, when you make a measurement, is there any way to know if your measurement collapsed the wavefunction or if it just measured a definite eigenstate that had previously collapsed?

2007-09-16 19:57:23 · 3 answers · asked by Jeffrey K 7

Or do you believe that possibly it is only relevant to general observation of mankind based upon our size state of existence relative to physics, and combined mass of the micro state of the universe which gives function to our universe.

2007-09-16 19:53:18 · 4 answers · asked by Thoughtfull 4

An electric power plant that would make use of the temperature gradient in the ocean has been proposed. The system is to operate between 5.00°C (water temperature at a depth of about 1 km) and 20.0°C (surface water temperature).

(b) If the useful power output of the plant is 80.0 MW, how much energy is taken in from the warm reservior per hour?
answer is wanted in TJ/h

so 80MW at a 5.2% efficiency is 1538MW so i figured i joule per watt so 10^6 times 1538 = 1538000000 in TJ/h i dont know if i calculated that right or if its wrong because if its seconds and not hours but it says im off by orders of magnitude

2007-09-16 19:29:25 · 2 answers · asked by sabresfan58 1

Energy from a vacuum

2007-09-16 19:21:05 · 4 answers · asked by Anonymous

2007-09-16 19:02:56 · 8 answers · asked by Asker 6

http://www.nasa.gov/audience/forstudents/k-4/home/F_NASA_Contests.html

2007-09-16 18:58:02 · 3 answers · asked by Anonymous

If nuclear fusion fuses hydrogen atoms together to make helium atoms and vise versa then why are stars running out of hydrogen if hydrogen is always made again by nuclear de-fusion which would probably mean helium turning back into 2 hydrogen atoms? This is a wierd phenomena. How is it running out when it is made again and again? Is nuclear fusion made more than nuclear de-fusion?

2007-09-16 18:50:01 · 4 answers · asked by Allen 2

The actual efficiency of the engine is 42.0%. How much useful power does the engine deliver if it takes in 1.15 10^5 J of energy each second from its hot reservoir?

i did the calculation (0.42) * (1.15 10^5 J ) and got 48300 joules and cannot figure out how to get it to kilowatt not kwh just kW is what the site asks for

2007-09-16 18:46:53 · 6 answers · asked by sabresfan58 1

During a volcanic eruption, chucks of solid rock can be blasted out of the volcano; these projectiles are called volcanic blocks. Rock is blasted at an elevation of 3300 meters at an angle of 35 degrees.

a) At what initial velocity would a block have to be to be ejected, at 35 degrees to the horizontal, from the vent to the foot of the volcano 9400 meters away?

b) What is the time of flight?

I can do B, but I dunno how to find initial velocity, most of the problems I did with projectile motion already gave me initial velocity. Here's what I did:

I used the formula y-y(0)=vt-1/2at^2. I'm going to assume the final velocity of this whole thing is 0, and gravity is -9.8m/s^2, so:

-3300=-4.9t^2; t=26

I used that "t" to plug into: v=v(0)+AT

0=v(0)-9.8(26); V(0)=255 m/s. The answer that the book got was 260 m/s, can anyone show me what I did wrong and how to do the problem? Thanks!

2007-09-16 18:42:19 · 3 answers · asked by Anonymous

2007-09-16 18:29:09 · 2 answers · asked by Anonymous

goes west 30 km from A-town to C-city, then 30 km south to D-burg, 12km west to E-town and 30 km N<45>E to B-Ville.

a) what is the shortest distance from A-town to B-ville?


b) if the express but takes 0.45 hours to go from A-town to B-ville, and the local bus takes 3.0 hour, calculate the average velocity for each bus.


please help me i am a stupid guy who will never stand on my own i can just rely on smart and above-classed people in this world who will probably get way better careers than me ill do anything for you if we ever meet!

2007-09-16 18:26:25 · 2 answers · asked by a idiot with dreams of wiseman 1

If so, some examples? Or a quick explanation. Thank you.

2007-09-16 18:23:19 · 4 answers · asked by thnbgr1 1

one to remove the sig zeros
two remove ambiguity as to the sig fig
three allow the ins of the numbers precision

2007-09-16 17:38:49 · 6 answers · asked by hitlovefree 1

small charged sphere of radius a=1.00 cm is suspended by a nylon thread inside a larger neutral, conducting sphere. The larger sphere has an interior radius b=3.10 cm and is Δ=0.5 cm thick. The charge on the small sphere is q=0.90 nC. The two spheres are concentric and insulated from their surroundings. For the following questions, the origin of our coordinates is the center of the spheres.

1) What is the magnitude of the electric field just inside the larger sphere?


2)What is the magnitude of the electric field at a radius 3.35 cm?

3) What is the magnitude of the electric field at a radius 10.0 cm?

4) What is the magnitude of the electric potential at the surface of the smaller sphere?

5) What is the magnitude of the electric potential at the outside surface of the larger sphere?



I've been trying to figure out this problem for couple of hours now, i cant seem to figure it out....please help

2007-09-16 16:57:44 · 1 answers · asked by chs_soccer_02 2