Physics - July 2007

2007-07-19 23:36:19 · 13 answers · asked by bob m 3

How moving charges produce Magnetic Field? What is the physics behind that?

2007-07-19 22:19:52 · 8 answers · asked by kumar 1

How much work is done by the barrier on the cart and by the cart on the barrier if a cart with spring plunger runs into a fixed barrier. The initial velocity, final velocity and mass of the cart are given.

2007-07-19 21:52:00 · 1 answers · asked by Physicspsycho 1

2007-07-19 21:31:49 · 5 answers · asked by jaswinder s 1

suppose lightning has to travel from point A to B, it always takes zig-zag or infinite turns to reach A-B, so why doesn't lightning travel in a straight line?

2007-07-19 20:03:24 · 11 answers · asked by Anonymous

Like if you dropped a tennis ball from a great height... does it accelerate during it's decent... and reach a top-out speed of an average maximum velocity?

In simple terms please. (Average maximum velocity of gravity allowing for slight variations in objects which generate some.. .whatever it's called where it slows the airstream)

I ask cause I read about a guy in my almanac... who was on a sidewalk of a US city... when a baby hit him on his head - the baby had fallen from a window of a skyscraper. They both survived - although he took a bit of injury.

Even more strangely.. the exact same thing happened to him 5 years later.. in a different US city, where another baby hit him on his head, having fallen from a skyscraper window. (Don't ask me what kind of person allows babies near skyscraper windows).

2007-07-19 19:04:37 · 19 answers · asked by golfgirl 3

2007-07-19 18:31:05 · 12 answers · asked by Anonymous

im struggling with this problem so any help you can give me would be great...

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the box.

http://session.masteringphysics.com/problemAsset/1007964/18/6335.jpg

What is the magnitude F of the upward force you must apply to the rope to start raising the box with constant velocity?

2007-07-19 18:30:07 · 3 answers · asked by dimachevelle 2

because if if the do.. then they will broke some law of nature;
1. there are no forms of life that could be found in our solar system, and that for 'them' to travel to earth from the outside of our solar system they need to go faster than the life and it would take for millions of years...
2. there's no scientific proof..
what do you think?

2007-07-19 17:50:03 · 12 answers · asked by >D_ConTradictor< 4

i mean, the only light could travel as fast as it self, so is there any other particles(not light) could travel faster than the speed of light???

thx

2007-07-19 17:16:49 · 13 answers · asked by Anonymous

how fast is the speed of light???

2007-07-19 17:09:33 · 10 answers · asked by Anonymous

If you are driving down the interstate going 70 mph and there is a fly in the car buzzing around....is the fly going 70 mph also?

2007-07-19 16:57:35 · 6 answers · asked by g8rfan4u 4

Why is time the 4th dimension of space? Why not something else? What led physicists to conclude time is the 4th dimension?

What is it we can move on in one direction in time, ie, forward? If we can move freely in the 3 dimension, why is it we can move only forward in time?

2007-07-19 16:45:50 · 5 answers · asked by Sleuth! 3

I was talking to my friend on the phone earlier, and she played a recording of our friend singing that she had recorded with her cell phone earlier that week. However, I could not hear any trace of the recording. Also, her phone was running low on battery, and it began to beep incessantly, and this I could not hear either. Then, I realized that if I were able to hear the sound produced by my friend's phone, I would also be able to hear my voice resonating around her kitchen, because I was on speaker-phone at that point. Why couldn't I hear the sounds being produced by the cell phone with which mine own was corresponding?

2007-07-19 16:44:49 · 1 answers · asked by Ellen H 1

A tanker ship is filled with 2.25 x 10^5 m^3 of gasoline at a refinery in southern Texas when the temperature is 17.2 degrees C. When the ship arrives in New York City, the temperature is 1.3 degrees C. The coefficient of volumetric expansion for gasoline is 9.50 x 10^-4/C degrees.

2007-07-19 16:44:25 · 2 answers · asked by Anonymous

A middle-aged man typically has poorer hearing than a middle-aged woman. In one case a woman can just begin to hear a musical tone, while a man can just begin to hear the tone only when its intensity level is increased by 5.5 dB relative to that for the woman.

2007-07-19 16:15:20 · 1 answers · asked by adrianterrellhogan 1

A wave has the following properties:amplitude=0.575 m, period=0.730 s, wave speed=14.4 m/s. The wave is traveling in the -x direction.

2007-07-19 16:10:13 · 2 answers · asked by adrianterrellhogan 1

2007-07-19 16:03:48 · 5 answers · asked by Adam M 2

I mean if you think about it, things happen all the time that shouldnt have happened that alter virtually everything.However maybe those things that shouldnt have happend were supposed to happen.

2007-07-19 15:31:29 · 14 answers · asked by brewer37 1

What is the speed of gravity?

Is there an physics equation?

2007-07-19 15:27:54 · 11 answers · asked by Anonymous

2007-07-19 14:57:27 · 4 answers · asked by Madelin U 1

2007-07-19 14:18:51 · 5 answers · asked by Anonymous

Given the same outside temperature, and assuming you disregard the initial phase when the air conditioner is dehumidifying the room (assume the room is sealed), would the humid air be better at cooling the condenser coils?

2007-07-19 14:04:46 · 5 answers · asked by Anonymous

2007-07-19 13:48:22 · 11 answers · asked by JAMES 4

What kind of magnets could pick up 100kg or more? And where would one get them? (I dont know a lot about particular magnets so I cant go into specifics)

2007-07-19 13:36:21 · 4 answers · asked by ntm495 4

Hello, I know this is a hard question to understand because I don't know how to really present it. So pleae bare with me.

I curious in learning more about mechanics but not nessarly in the field of auto mechanics. But more around the lines of using compents like gears, cranks, shafts, etc to build things that can function once all the peices are put in place.

I don't know what this would be called and perhaps someone else may know? I know it's mechanics but is there a more scientific name to it?

Thanks.

I'm hoping someone in the physic section of yahoo answers could give me some names or terms to use for a search. Thanks.

2007-07-19 13:27:32 · 3 answers · asked by Anonymous

2007-07-19 13:15:31 · 3 answers · asked by Michael P 1

I remember in high school it was said that current is the flow of electrons. (Note the textbooks then were very old)

But it seems that the above statement is incorrect and it is found that current flows in the oppsite direction of the electrons.

So what is current exactly? Is voltage now the flow of electrons is it is the force that pushes?

2007-07-19 13:14:51 · 4 answers · asked by Anonymous

2007-07-19 12:44:07 · 12 answers · asked by Anonymous

2007-07-19 12:13:54 · 17 answers · asked by ejay2cool92 2