Physics - July 2006

2006-07-10 14:13:32 · 15 answers · asked by musiczar 1

If a spaceship travels in light speed to the nearest galaxy upon his arrival Earth will be a few million years older. Action and reaction exists apparently everywhere and in everything. Is it safe to say that the ship in order to return to its point of origin will have to travel backwards in space and time. Will the understanding of dark matter and energy will provide us with an answer?
And what about the paradox? As the spaceship travel in light speed and the earth gets older and more technologically advanced wouldn't the dissendents of the travellers catch them on route or meet them at the finish line?

2006-07-10 13:52:30 · 5 answers · asked by petros465 1

Let's say I travelled back into time and shot my grandfather(the grandfather paradox. BTW, I would never do this). Wouldn't I know that my grandfather would live because he did it before. See, In my grandfather's "original" lifeline, I also came from the future and shot him and he survived(how else would I be around to shoot him). So you see, if I shot him, wouldn't physics make sure he didn't die?

Why is it a paradox? My grandfather was shot. he lived. he had my mother who had me. I travelled back in time, shot him, and he lived, had my mother, etc.

Wouldn't physics prohibit his death?

Or am I completely off my rocker?

2006-07-10 13:47:41 · 8 answers · asked by iammisc 5

2006-07-10 13:39:39 · 10 answers · asked by CHAZ2006 3

2006-07-10 13:04:50 · 20 answers · asked by felix_therox 2

2006-07-10 12:50:33 · 15 answers · asked by sara t 1

2006-07-10 12:41:52 · 5 answers · asked by Yape 1

Seriously, some of the responses sound as if the person was so sure of themself but are horribly wrong.

2006-07-10 12:29:49 · 21 answers · asked by Nick N 3

Ok I know its not possible because we don't have the technology, but in theory would it be?

2006-07-10 11:54:18 · 18 answers · asked by Anonymous

through the element. How much energy is used up during a period of 5 hours by the element?
A. 352 Wh
B. 550 Wh
C. 1760 Wh
D. 2580 Wh

2006-07-10 11:25:42 · 9 answers · asked by Andrea 3

At school i was taught there are only 3 states. Solid, liquid, or gas. How then, can liquid crystal be explained? Also, ut has been brought to my ateention that there are several others which exist in a grey area to all those without a PHd in Chemistry.

2006-07-10 11:09:57 · 9 answers · asked by mehboobahmad 2

If gravity is dependant on the presence of two masses and the distance between them, and at the atomic scale mass is constantly moving, won't the gravity resulting from two masses be constantly changing?

2006-07-10 10:51:34 · 3 answers · asked by Robert S 1

Many assume we feel gravity, but there is no tactile sensation; neither do we see, taste, hear, or smell it.

2006-07-10 10:23:30 · 11 answers · asked by R. Hike light 1

... to reach the ocean floor. I was asked this question in an interview. They were testing my thought process and I am very interested in a rough answer!

2006-07-10 10:22:27 · 5 answers · asked by JB 1

Quantum physics totally confuses me. I just seen "what the bleep" (documentary) and they said that there are photos of this phenomena: can anyone direct me to a link so I can see this for myself? I'm pretty sure it is something small like a spec of dust or sonething.

2006-07-10 10:15:55 · 14 answers · asked by D J 2

1. A Boeing 767 travelling at 590 mph has more energy than a Boeing 757 travelling at 530 mph. (Bigger plane - more mass, higher speed, therefore more kinetic energy). Also walls of reinforced concrete and steel can sustain greater impact than sheets of glass and steel. How did the 757 plowed through more than 235 feet of concrete and steel (Pentagon) and the 767 couldn't even go through 208 feet of glass and steel (WTC tower 2)?

2. A 1368 foot tall building with 110 floors (approx 12.44 ft per floor) takes 96.9 seconds to collapse under the "pancaking" or "progressive collapse" theory. The WTC towers took close to 10 seconds. 9.25 seconds is the free fall time from the top of the towers. I have explained this in the section below.

3. Gravity on the earth's surface points downwards. If no other forces are introduced and the resultant is still vertically downwards, why are there plumes and projectiles going sideways and upwards in the videos of the WTC collapse?

2006-07-10 10:13:15 · 5 answers · asked by The_Dark_Knight 4

Edwin hubble discovered that there are stars and galaxies as far as you can see but none show any sign of a center of orgin or singularity; no one spot in the universe is signifigant to another.if this is true why do people beleive in the big bang theory and what physical shape can explain the properties of this universe. Any sphere would be insufficient since a sphere has center. maybe I'm missing something.

2006-07-10 10:03:56 · 11 answers · asked by brent l 1

If we had the time and resources, and were able to actually create a wormhole, what would we find inside? Would it have a tunnel-like effect, or would you never notice the hole itself as you passed through it and instantly appeared on the other end?

I realize this is a question of theoretical physics, but I've never heard anything mentioned about the "inside" of one. Has anyone?

2006-07-10 09:59:30 · 9 answers · asked by Anonymous

is 12 ohms and the resistance of the other device is 4 ohms, the total resistance of the two devices is..?
A. 0.625 ohms
B. 0.333 ohms
C. 3 ohms
D. 16 ohms

2006-07-10 09:07:04 · 6 answers · asked by Andrea 3

2006-07-10 09:01:42 · 4 answers · asked by e=mc2 1

A. exposed to weak light.
B. cooled rapidly.
C. bombarded by high-speed electrons.
D.subjected to a small voltage.

2006-07-10 09:00:20 · 7 answers · asked by Andrea 3

2006-07-10 08:44:45 · 20 answers · asked by belideli 1

Einstein was an atheist who used God as a metaphor for the cosmos and the rules of the universe. His quotes have been misinterpreted by religious people who think Einstein believed in a personal god, or that he had faith in some sort of supernatural basis for the cosmos. Have Einstein's "God quotes" been helpful or harmful in communicating his ideas to future generations?

2006-07-10 08:34:16 · 9 answers · asked by Jon R 2

Air is very dense at sea level so one would imagine that the protons, neutrons & electrons would be close enough together to obscure light.

2006-07-10 08:28:04 · 14 answers · asked by Alex M 1

2006-07-10 08:12:46 · 17 answers · asked by Anonymous

when a fly flies (say30 kmph) within a jet along the direction of jet travelling, the jet travels in speed of 1000 kmph what is the actual speed of fly (have u ever saw fly flies in a bus).remember that fly wont have any physical contact with jet.

2006-07-10 07:35:14 · 10 answers · asked by fromhell17 3

2006-07-10 07:03:56 · 12 answers · asked by mchrisco2003 1

About two years ago there was a plan to build a space rocket powered by two electromagnets disconecting - when two electromagnets disconnect from each other they release a large ammount of energy, there was a plan to harrness this and use it to power a space rocket. I havn't heard since about it.

2006-07-10 06:56:47 · 5 answers · asked by Alex B 1

i.e. does food heated in a microwave cool faster than food heated slowly on a stove?

2006-07-10 06:41:15 · 14 answers · asked by Z, unnecessary letter 5

How can the universe expand into something that doesn't exist? Could it be that nothing is actually something? A true paradox?

2006-07-10 06:04:28 · 12 answers · asked by Chad W 1