Physics - May 2007

Let us say that the universe contains only two pieces of matter, a space ship as a whole, and you in it! There are no planets and no galaxies. The universe is an empty void with not a single atom in it. You are free to travel in any direction.

What SPEED will you choose?

Note: Please answer in your own words, no google or wikipedia etc...

2007-05-29 05:32:47 · 8 answers · asked by Anonymous

2007-05-29 05:15:54 · 9 answers · asked by Ninad S 2

i got the dictionary definition, "The four-dimensional continuum of one temporal and three spatial coordinates in which any event or physical object is located.", which i understand, but i was thinking about somethin i saw on Nova, i think, that explained gravitational pull through this analogy; imagine that the sun is a bowling ball on a trampoline, and the earth is a golf ball, the sun creates a depression in space-time that draws the earth toward it.

2007-05-29 04:33:43 · 4 answers · asked by Anonymous

1. what causes light to be emitted from an atom?

2. why are only certain wavelengths emitted from atom?

3.Why does hydrogen emit different wavelengths of light than mercury?


thanks first one with all 3 answers get best answer.

2007-05-29 04:29:07 · 7 answers · asked by Joseph V 1

any kind of website and from where 2 collect data.

2007-05-29 04:27:26 · 5 answers · asked by zaid ahmad 1

Why do you weigh mor eon the earth than you do on the moon?

Next Question is...

Why do satellites not fall down on earth?

I appreaciate every bit of help I can get, Thanks!

2007-05-29 03:49:18 · 7 answers · asked by savannah 1

2007-05-29 03:41:06 · 11 answers · asked by weird_girl 3

a mass hanging from a vertical spring and a simple pendulum each have a period of oscillation of 1 sec. If you were to take these devices to another planet where the acceleration due to gravity is greater than on earth, would the period of each device be greater than 1 sec , less than 1 sec, or the same? why?

2007-05-29 03:09:11 · 3 answers · asked by Anonymous

2007-05-29 03:01:20 · 8 answers · asked by beck 2

Ok. How can someone prove that there is Time(past, present, future)? I know we feel the time, actually we invented the notion of time but does time really exist?or is just entropy?

2007-05-29 02:37:06 · 8 answers · asked by noTime 1

2007-05-29 01:59:10 · 7 answers · asked by Gillbates 2

Where did it go?

2007-05-29 01:51:38 · 5 answers · asked by Anonymous

What I want to know is Just how big the universe is.. I mean what was before time .. I mean its really weird you know I just cant comprehend how big the universe is and how we became there isn't no god nor no devil first of all if there was a god we wouldn't have war etc anyways how big is the dang universe! i know theres billions of other universes but WTF how did it become? I mean what was before What ever created the universe is it never ending. and even if the universe Died and everything got sucked in.. it will go some where right? i mean Nohting is something is it an eternal white! or what and when is are sun gonna explode im waiting!????

2007-05-29 01:34:45 · 4 answers · asked by Anonymous

2007-05-29 01:17:07 · 6 answers · asked by goring 6

At one point, my text book states that the speed of sound is approximately 5000m/s in iron (desnity = 7.9 g/cm^3) and about 330 m/s in air (density = 0.001 g/cm^3). However, it then states that: "WAVES WILL TRAVEL FASTER IN AIR THAN IN IRON, BECAUSE THE AIR IS LESS DENSE." Is it just me or is this statement false?

Can someone please give a detailed sceintific explanation to how the velocity and wavelength of waves change as they enter different media?

2007-05-29 00:47:08 · 9 answers · asked by ? 1

2007-05-28 23:44:51 · 5 answers · asked by nikhil science 1

2007-05-28 23:03:28 · 23 answers · asked by Prem 1

We are storing bottled water in a freezer to keep it cold, and when we take the bottles out of the freezer they then freeze to ice before your eyes. This happens faster when shaking or opening. The freezing occurs usually from top to bottom.

The bottles are not pressurized and the water is distilled drinking water.

What causes this?

2007-05-28 22:24:07 · 4 answers · asked by Blue 4

2007-05-28 22:23:37 · 3 answers · asked by Anonymous

2007-05-28 22:04:36 · 3 answers · asked by Anonymous

can we somehow lengthen each second...so I can live longer?

2007-05-28 21:58:55 · 4 answers · asked by Fire Lemon 2

Well, if you think about it, everytime you exercise, you use energy which results in a loss of mass!

2007-05-28 21:54:34 · 6 answers · asked by Anonymous

My surmise is that quantum entaglement has different levels of attachment and influence...

1. The big bang singularity: all matter, even the matter in our own bodies, is tied to the original incidence of quantum entanglement, within the singularity. All matter intermixed and thus became entangled, permanently. The impact upon us is now quite weak, but possibly discernable.

2. Far away objects. We are entangled to nearby and far away stars, which constantly interact with us, jiggling molecules inside our bodies. The vibration is weak, however, but can be amplified if desired.

3. A trip: we go on physical journeys to reclaim our past entangled connections. We also forge new connections when we arrive in a new place.

4. Home: this is the area of most intense quantum connection. This affects our bodies the most, since we are always touching things in our house and creating new entanglements. The vibratory effect upon us is at its most intense while we are home....

2007-05-28 20:56:20 · 2 answers · asked by sassychickensuckerboy 4

i didn't under stand the prof when he explained it.. please explain it to me(explain how do we get the answer) :
Velocity

Question: A subway train starts from rest at a station and accelerates at a rate of 1.60 m/s} ^ {2} for 14.0 s. It runs at constant speed for 70.0 s and slows down at a rate of 3.50 m}/s} ^ {2} until it stops at the next station. Find the total distance covered.

Answer: Acceleration phase:
s=1/2 at^2
s=1/2 * 1.6 *14^2 = 156.8 m

At that point, the train moves at v=at = 1.6 * 14=22.4 m/s, so for 70 seconds, the distance traveled at constant speed is 22.4 * 70 = 1568 m/

Deceleration phase:
v=a t
22.4 = 3.5 * t so t is 6.4 seconds
Distance traveled during deceleration is
s=1/2 a t^2 = 71.68 m

total distance traveled is thus 1796.48 m

2007-05-28 20:48:32 · 4 answers · asked by mhd1995 1

earth rotates @18km/sec - planes flying in reverse direction of earth's rotation dont reach their destination quicker - why ?

2007-05-28 20:29:09 · 9 answers · asked by chander b 1

I have to identify energy transfers and transformations involving the conversion of energy in household items. I've tried, and this is what i've managed.

Cordless Drill:
240v AC electrical energy from ring main --> 14.4v DC (in transformer (and rectifier?)) stored in battery --> mechanical energy (via the motor effect in the motor producing torque)

Downlight:
240V AC electrical energy from the lighting circuit --> 12V AC (in the transformer) --> heat energy from resistance in the filament --> kinetic energy of electrons and atoms in filament --> light energy in the form of black body radiation

Refrigerator:
240V AC Electrical energy from the ring main --> mechanical energy (compressor in the motor) --> thermal energy

The problem is, i don't think the cordless drill or the refrigerator are in enough depth, and i don't even know if the downlight one is right, i was just guessing. And i don't know enough about how the drill or fridge work to go more in depth.

HELP!!!!

2007-05-28 18:37:24 · 2 answers · asked by Anonymous

2007-05-28 17:26:27 · 4 answers · asked by Brian S 2

I have been given a task to design an experiment at school, and since I don't want to do a bouncing ball experiment, I decided to do a variation the Morley experiment for detection of an ether.

Problem is, I have very limited materials and skills. I have pocket lasers, and Lego Mindstorms kits and a very basic level of electronics.

So I am actually asking two questions here. First, is ideas on other ways an ether can be detected(yes I know it is accepted that it doesn't exist, but I don't care about the results, I want to do something cool) but please answer this question without spood feeding me with answers, as I want my idea to be original.

Second, how would I do the original experiment in the first place with limited materials and skills(as my variation will be similar)?

2007-05-28 17:14:23 · 5 answers · asked by worried person 1

2007-05-28 16:27:31 · 13 answers · asked by hairypotto 6

2007-05-28 16:21:27 · 6 answers · asked by sapherous 2