Physics - July 2006

be able to escape Earth's gravity, and if so how long would it take to reach the moon?

2006-07-22 11:29:52 · 6 answers · asked by martin h 6

When a 2.0-kg object is suspended in water, it “masses” 1.5 kg. What is the density of the object?

2006-07-22 11:25:22 · 3 answers · asked by Anonymous

A swimmer wears a heavy belt to make her average density exactly equal to the density of water. Her mass, including the belt, is 60 kg. At a depth of 2 m below the surface of a pond, what buoyant force acts on the swimmer? What net force acts on her?

2006-07-22 11:23:56 · 3 answers · asked by a_distorted_realitys_big_nothing 1

2006-07-22 10:33:40 · 9 answers · asked by Am 4

So, maybe Humans can produce electricity after all…
I remember reading a Q asking if it was possible for a human to wear a suit to produce electricity from what they do everyday (move).

I recently ran across this article yesterday…
“Bob Komarechka, a geologist from Sudbury, Ontario, spends many tedious days in the field lugging rock samples and electrical instruments. Two seemingly unrelated desires—one for a pair of comfortable gel-cushioned soles, the other for an alternative to frequently changing his instruments’ failing batteries—led to an epiphany.

In May 2001, Komarechka received a U.S. patent for a shoe design that uses the rolling motion of walking to produce a steady flow of electric current. When a person steps forward, fluid is forced out of a sac in the heel through the blades of a small turbine into another sac in the toe, where the fluid is held by a check valve. When the foot rolls onto its toe, the fluid is squirted back through the turbine and into the heel. Both the turbine and a microgenerator are located between the sacs, in the center of the sole, and a socket connects a wire to electrical devices.

Using calculations based on the average person’s weight, Komarechka believes that the shoes could generate a steady three watts of electricity—enough to power a hand-held computer, a GPS device, or a radio, or to continuously recharge batteries.
No prototype exists yet, although Komarechka is waiting for replies from Reebok, Nike, and the U.S. military. “I know I can make it work,” he says. “It’s fairly straightforward.””

Source:
http://www.yesmagazine.org/article.asp?ID=1012
So now the question is, is harnessing human movement possible in the future to create energy?

(even if it only powers my rechargeable batteries for my MP3 player I’ll be thrilled! Endless MUSIC!)

2006-07-22 10:18:38 · 4 answers · asked by Am 4

I'm looking for somewhere that i can put my opinions and theories about physics,math,and etc

2006-07-22 09:59:28 · 3 answers · asked by violin_love1369 1

If matter transporters really work like the way in Star Trek etc. (i.e. breaking him down into atoms and then rebuilding him from atoms at the other side), doesn't that mean the original person is actually killed and the person come out is really just a clone?

I mean even if he has the exact memory as the original, he'll believe he is the original, but the truth is the original is really killed during the process and he is really just a clone with the exact memory, isn't it?

No I'll never go through a transporter even when it becomes a reality, you're killing yourself!

2006-07-22 09:46:03 · 5 answers · asked by C1N2G8 1

To the way it normally does, that is! And, I know the ocean would be a tiny hiccup - but, for the purpose of this question imagine all land mass is joined.

2006-07-22 09:31:49 · 28 answers · asked by Lauren 2

Why does touching a past version of yourself cause a paradox?
In sci-fi shows which involve the main characters travelling back into their own pasts, protagonists are often warned that touching their past selves will cause a paradox (for example, in the Doctor Who episode 'Father's Day'). If you accept that being part of your own timeline is possible without causing a paradox, why does the act of two versions of yourself from two different times touching cause one?

This is not my question someone asked this in the philosophy section but i want to know the oppinions for those in the physics section.

2006-07-22 08:55:48 · 9 answers · asked by candyisland2002 2

Speed is measured relative to a stationary object. Velocity is determined by calculating the time it takes to travel a known distance from a stationary object. A cars speedometer measures speed relative to the stationary ground it is traveling on. An airplane measures speed by the same thing, by how long it takes to travel between points of a known distance on the ground.

So when it is said that a spacecraft is hurtling at 46,000 miles per hour beyond the orbit of Pluto towards the next star, what is that speed being compared against? In that part of space, there is no stationary object to calculate velocity. Is it still being compared to a stationary object on the surface of the Earth? At that distance, the Earth is traveling through space in orbit around the sun, which is traveling in orbit around the galaxy, which is traveling through space around who knows what.

So, what is the spacecraft traveling at 46,000 miles per hour from or towards that can be measured?

2006-07-22 08:44:34 · 7 answers · asked by cdb 3

2006-07-22 08:41:52 · 11 answers · asked by AlwaysWondering 5

i just bought an ice cold bottle of 7 up. at first it was cold but not in a solid nor liquid-solid state but just plain liquid state. the moment, i opened it, the 7 up started freezing from top to bottom and it felt like slurpee when i drank it. howd this happen?

2006-07-22 08:10:28 · 9 answers · asked by Jigz 2

In a sense he gave the people of the world the key to the doors of Armageddon. He did not turn the key but he forged it and handed it to the people that had the power to turn his creation into the most destructive force that man has ever controlled, the nuclear bomb.

He lived long enough to witness the destruction that his brain-child brought down on Hiroshima and Nagasaki, and saw the tests carried out by the United States, beyond the point of being able to stop it.

Think of what he must have felt...
Think of the guilt.

2006-07-22 08:07:26 · 17 answers · asked by •) (• 2

suppose u r told that the linear size of everything in this universe has been doubled overnight.

Can u test this statement by measuring sizes with a metre stick ?

Can u test it by using the fact that the speed of light is universal constant and has not changed?

What will happen if all the clocks in the universe will aso start running at half the speed.

2006-07-22 08:05:21 · 9 answers · asked by omsandip 1

Chicago Ridge IL 9-13-74 Please I want to see how good you guy's are. Please only Physics please.

2006-07-22 08:00:09 · 13 answers · asked by sweat mamma bear 3

the metre is defined as the distance travelled by light in 1 / 299,792,458 th of a second.

why did'nt people choose some easier no. such as 1/300000000 th of a second or why not even 1 second ?

2006-07-22 07:59:51 · 6 answers · asked by omsandip 1

2006-07-22 07:59:09 · 10 answers · asked by CurlyQ 4

2006-07-22 07:54:12 · 5 answers · asked by sweat mamma bear 3

2006-07-22 07:47:19 · 6 answers · asked by rampdogg2000 2

2006-07-22 07:38:27 · 7 answers · asked by Anonymous

Does your drink cool faster by pouring the drink over the ice cubes already in the glass, or by adding the ice cubes after the drink is poured? Or does it make any difference.

I always put the ice in first, since I theorize that the WHOLE drink will cool, as opposed to just the top where the ice is, but is that true?

2006-07-22 07:12:10 · 13 answers · asked by butireallyam_nikkijd 3

I want a detailed mathematical proof so please send a Web reference because equation editing must be hard on this system.

2006-07-22 07:01:53 · 9 answers · asked by Joseph Binette 3

I understand that it would be hard to organize but what would happen?

2006-07-22 06:38:38 · 12 answers · asked by Anonymous

I imagine different sheets, the weight on them, the weather conditions, and goodness knows how many other variables would affect this. All I want to know is if you really could do it or if it is just a cool idea like Mary Poppins' umbrella. If you stood at a height of x meters or miles or whatever, could a sheet save you from plummiting to a rather nasty death, or is the only parachute a real parachute?

2006-07-22 06:33:35 · 22 answers · asked by Frankie 2

I am studying particle accelerators and tungsten is mentioned as the target for an electron beam in order to make positrons. Can lead (or any element) be used for the target, or is it only tungsten? Thanks.

2006-07-22 05:46:44 · 2 answers · asked by Kolinahr7 1

2006-07-22 05:34:22 · 9 answers · asked by Anonymous

I think all the fundamental forces [gravity, electromagnetism, strong, weak] are all fluctuations of the dimensions of spacetime. Gravity is due to the bending of spacetime due to mass; so isnt it a possibility that all the forces are due to the fluctuations of spacetime; maybe the strong & weak are due to mass fluctuating in the higher-dimensions of spacetime, or could there be a fifth force in the higher dimensions that binds them altogether.

2006-07-22 05:21:43 · 7 answers · asked by German M 1

2006-07-22 05:19:58 · 7 answers · asked by rmoller69 2

2006-07-22 05:08:22 · 13 answers · asked by Javier U 1

Bohr atomic planetary Model
Rotational equilibrium theory

2006-07-22 04:59:22 · 1 answers · asked by goring 6