Physics - June 2007

Besides the fact that we base "time" on the movement of celestial bodies, how is time related to space?

2007-06-02 15:44:42 · 10 answers · asked by Michael n 2

Could gravity just be an attraction between particles in objects, like a weaker form of magnetism?
Since magnets are polarized, they have a strong attraction, but since charges are spread evenly through normal matter (not magnets), they might just attract one another proportional to the amount of mass, since the charges are spread evenlty throught the objects that share a gravitational attraction.

Also, is gravity necessarily a distortion of space?

2007-06-02 15:41:45 · 7 answers · asked by Michael n 2

If a fly is in a car, does it have to fly foward if its not landed on something?

2007-06-02 15:24:36 · 8 answers · asked by hi 3

2007-06-02 15:12:18 · 5 answers · asked by chad 1

It is possible to cross an infinite space. Take any distance, say the distance from one hand to the other. Halve that distance, then halve that half, and repeat forever. The number can be halved for all time. Now think as each half as a point. That would mean there are an infinite number of points between your hands. Yet you can cross that distance. Mathematically sound theory.
I also want to note that i am no scientist, or mathematician so this may be wrong. Let me know.

2007-06-02 15:12:11 · 11 answers · asked by vaughan9420 2

Is travel into the future possible even though light has not reflected off that moment to show existence of the moment? If we create a time travel device in the future, is it true that in a sense it already exists, if we are able to travel into the past with it? Can we create a telescope of sorts that seeks out light reflected off our planet and then capture single waves in a film format to actually look into the past? The Hubble looks across the galaxy and snaps a shot of a potential Earth like planet. The light from this planet takes 1 million years to reach Earth. Therefore the image to an earth eye is what that planet looked like 1 million years ago. Do telescopes see a zoomed image of this 1 million year old reflection, or a real time view?

2007-06-02 14:38:10 · 6 answers · asked by s g 2

Why do photons not have infinite mass???

2007-06-02 14:29:50 · 4 answers · asked by Moose 4

Ty.

2007-06-02 12:59:44 · 13 answers · asked by Matthew B 1

2007-06-02 12:32:54 · 4 answers · asked by Pradeep k 2

2007-06-02 11:45:24 · 5 answers · asked by lisa_t197 3

Thanks in advance.

In a free body diagram, a thrust force is projected to the right of the page at about a 45 degree angle.
A weight force (Fg) is projected downwards and is smaller than the thrust force. Therefore the Fnet is projected to the right at an angle.

Question: Write a short description of a REAL object for which this is the correct free body diagram.

2007-06-02 11:41:31 · 3 answers · asked by Anonymous

Thanks in advance for your help!

A 500 g model rocket is resting horizontally at the top edge of a 40 m high wall when it is accidentally bumped. The bump pushes it off the edge with a horizontal speed of 0.5 m/s and at the same time causes the engine to ignite. When the engine fires, it exerts a constant 20 N horizontal thrust away from the wall.

Part A: How far from the base of the wall does the rocket land?
Part B: Describe the trajectory of the rocket while it travels the ground.

2007-06-02 11:35:49 · 1 answers · asked by Anonymous

if an AC current goes through a human, the human transmit electromagnatic waves (my previous question).

so does that mean if electromagnatic field applied to a human, the human will generate electrical current?

i'm talking about the brain. and please have a look at my previous question here http://answers.yahoo.com/question/index;_ylt=AjJZ.Q_vZlzVL4D809FCm6Tsy6IX?qid=20070531210334AA1DYwL


thanks!

2007-06-02 11:23:57 · 2 answers · asked by Default 3

2007-06-02 11:23:50 · 4 answers · asked by Anonymous

2007-06-02 11:22:05 · 5 answers · asked by Anthony L 3

2007-06-02 10:45:49 · 3 answers · asked by ibid 3

2007-06-02 10:40:51 · 9 answers · asked by Anonymous

2007-06-02 10:12:37 · 9 answers · asked by Mercury 2010 7

Scientists are having difficulty controlling hydrogen fusion reactions on Earth. Yet they can control the hydrogen reactions in a fuel cell. Explain why this is so. (Hint: Referencing Einstein's famous equation in your explanation might help.)

This is for my study sheet that is for notes only. The teacher never looks at it, never grades it, and knows that it is just for me to study before tests.

So, I am having a hard time answering the questions without any help or any answers, as there are none because not a lot of kids take the time to actually complete their study sheets. Please help me. This question is one of the most important ones on the study guide.

2007-06-02 09:55:00 · 3 answers · asked by Hello 3

Please help. many thanks

2007-06-02 09:27:20 · 1 answers · asked by Katie D 1

I am trying to use an equation involving alititude, and I need to know what the scientific notation or symbol for it is.

2007-06-02 08:42:41 · 5 answers · asked by Anonymous

If Albert holds a mirror in front of his face while travelling at the speed of light, will he be able to see himself in the mirror, or will the light from his face never reach the mirror ? Also what would be the speed of light coming off Albert's face be to an observer on the ground at rest relative to the earth?

2007-06-02 08:29:15 · 4 answers · asked by Portman 2

I'm doing a physics project for my final. I am trying to find the force of how hard I hit a tennis ball. I dropped the ball and let it bouce back up then hit it at the top so the Velocity is 0. I found time and distance but I don't know how I should find the Force. It's driving me crazy and I have to finish this thing by Moday so I'm starting to freak out. Can anyone help me??!

2007-06-02 08:07:27 · 1 answers · asked by Anonymous

I know the deepest hole ever dug is not very deep at all. In fact, if someone can site that it would be nice.

2007-06-02 07:16:20 · 2 answers · asked by ? 5

2007-06-02 07:15:00 · 4 answers · asked by fe203 1

I'm going to be in a physics class next year and I kind of know what it is but not completely. What's it used for?
Thanks.

2007-06-02 06:44:58 · 8 answers · asked by Netti 3

The electric circuit to which a television set is connected is protected by a 15 A circuit breaker. If the power rating of the set is 450 W how many 100 W light bulbs can be operated as well on this circuit without overloading the circuit breaker?

2007-06-02 06:20:28 · 4 answers · asked by de4th 4

Can you explain as this is a serious question.
Thank you.

2007-06-02 06:13:08 · 5 answers · asked by fishtanks 2

I need for a science genius to answer these questions.

1.) A concrete coulumn is to support a 2100000-lb load with a safety factor of 2.5. What must its cross-sectional area be?

2.) If its unstressed height is 80 ft, what will its loaded height be?

Please help, I need to graduate, i will appriecate it.

2007-06-02 06:10:38 · 3 answers · asked by Anonymous

A ray of light passes from air into an unknown substance. If the angle of incidence is 54.0 degrees and the angle of refraction is 36.0 degrees, what is the index of refraction of the unknown substance? (The index of refraction of air is 1.00.)

2007-06-02 05:55:43 · 5 answers · asked by Anonymous