Physics - December 2007

two satellites (same masses) orbit round Earth in radii r and 2r (from Earth's center). The closer satellite experiences force of gravity (F). What additional force (Fo) need to be added to force of gravity experienced by farther satellite so that both complete one revolution in equal amount of time.
find F0 in terms of F?

2007-12-20 05:27:57 · 2 answers · asked by Anonymous

20 inches of lead in more effective than 20 inches of water, but the combination of 10 inches of each is more effective than either.

Why?

2007-12-20 04:53:00 · 3 answers · asked by Anonymous

I deliberatly put this question here and not in Entertanment section, because I think that people here have higher criteria.

2007-12-20 04:44:34 · 13 answers · asked by Wintermute 4

I understand that the state of a system at any instant of time is completely specified if we give the positions and velocities of all the particles, but why not also the accelerations and higher derivatives?

2007-12-20 04:38:15 · 5 answers · asked by Anonymous

Calculate the probability that you will dematerialize one morning and rematerialize on the surface of Mars?

lol!

2007-12-20 04:10:24 · 9 answers · asked by Anonymous

In the twin paradox the person traveling near the speed of light appears to age slower than the twin on Earth and vice versa.

I don't get the whole vice versa part. Who actually ages more slowly?

2007-12-20 03:56:56 · 9 answers · asked by kano7_1985 4

He said that time goes slower, the faster your speed. A few minutes later he was talking about GPS stellites going 18,000 miles per hour, and sending an image to Earth. I was half asleep, but I could have sworn that he said that if the time was traveling slower for the satellite, then the image would be jumbled! Or he might have said that it is proof that time does travel slower when you travel faster. Which one is it?

2007-12-20 03:34:44 · 3 answers · asked by Anonymous

2007-12-20 03:05:16 · 11 answers · asked by Anonymous

2007-12-20 02:56:48 · 15 answers · asked by anil m 6

The closest thing I can think of is the 5th comprising ALL alternative options that did not occur in reality. i.e.--if history didn't proceed in the way it did and took a significant "turn", (say JFK survived for example).
Any thoughts?

2007-12-20 02:55:50 · 8 answers · asked by bradxschuman 6

i bought a book on the quantum theory i was wondering what it was and bought the book (haven't read it yet finishing of a paper on mercury) in anyway just wondering can someone give me the gist on what the quantum theory is

2007-12-20 02:54:33 · 3 answers · asked by Anonymous

The rear of a bicycle passes a point O on a road with a velocity of 4 m s-1 and an acceleration of 2 m s-2.
4 seconds later the front of a car passes O with a velocity of 2 m s-1 and an acceleration of 4 m s-2.
When and how far from O does the dront of the car meet the rear of the bicycle?

2007-12-20 02:41:13 · 3 answers · asked by Alan 2

2007-12-20 02:28:32 · 25 answers · asked by thoraxe_the_lmpaler 2

Light travels at the speed of 3.8 lakh km/sec. similar is the speed of electicity. What is the speed of Gravitation or Magnetism ?

2007-12-20 00:11:21 · 11 answers · asked by kishan j 1

My triangular prism is made of perspex. I have tried using florescent lights, torchlights, but I still can't see the spectrum. Does it work only with sunlight?

2007-12-19 23:55:15 · 5 answers · asked by E-girl 2

What is your favorite math topic? Why? I love geometry because geometric shapes are so beautiful and geometric proofs increase my attention to detail.

What about you? Tell me about your math experience and what your favorite math topic is and why?

2007-12-19 23:14:08 · 8 answers · asked by Anonymous

Please don't say gravity as I know that sticks us to the Earth. For example, why are those of us on the side of the planet still not stuck to the Earth by our Feet but kinda' hanging off sideways. I hope people can understand my zany but good question.

2007-12-19 21:26:51 · 8 answers · asked by Anonymous

During a miliary function,bullets are usually fired in the air.But when the bullet comes back to the ground,why does'nt it hit somebody?And if it does,why does'nt somebody get hurt due to its impact?

2007-12-19 18:58:21 · 8 answers · asked by asheeb r 1

Correct me if I'm wrong. Matter can transform into massless energy, and vice versa. Can someone explain how this is possible, if it is true?

2007-12-19 18:45:51 · 6 answers · asked by calzrhe 7

2007-12-19 18:31:40 · 3 answers · asked by gal2210 1

Could I use a series of transformers to step up an extremely low voltage - like a 9V battery - to a very high one (like that of a power station) by using superconductor matrial for the wires and cooling it to about 4 degrees Kelvin in order to overcome any resistance? I imagine it would be expensive, but would such a device have any benefit for power generation? Could it be done or would the low temperature slow the flow of electrons?

2007-12-19 17:54:02 · 8 answers · asked by Anonymous

This applies for opening an envelope of the type where glue is preadded on typically both sides (so you wont need to lick them): When opening the envelope rather quickly in the dark, a blue light (like a tiny lightening) is emitted from glued surface. It only works if the envelope is opened fast. Can anyone explain this phenomena and what type of glue is used?

Regards Lucas Jensen

2007-12-19 17:02:49 · 6 answers · asked by Lucas 1

A block of mass M1 slides along a frictionless tabletop at a speed of v0 toward a second block of mass M2. A coil spring with spring constant k is attached to the second block in such a way that it will be compressed when struck by the moving block. What is the maximum compression of the spring?

This is the drawing given with the problem:
http://img43.imagevenue.com/img.php?image=28138_mass_spring_drawing_122_1014lo.jpg

Thanks in advance,
-tauntingpillow

2007-12-19 16:24:14 · 3 answers · asked by tauntingpillow 1

Could a pinhole microwave camera be made? I'm talking about a camera to see the wavelengths used by cell phone. If I remember right, they're a maximum of a few inches in size. Is there an easy way to focus microwaves like a camera focuses visible light, or would it have to work like a pinhole camera? Would mirrors work, like a reflective telescope? How much "brighter" is a cell phone than background microwave radiation on the earth?

2007-12-19 16:22:57 · 6 answers · asked by Anonymous

A cannon at rest with a mass of 1.2 x 10^3 kg fires a 53kg person out of it (horizontally) at a velocity of 67 m/s. What is the recoil velocity of the cannon?

2007-12-19 16:16:08 · 6 answers · asked by Kayla B 1

2007-12-19 15:54:06 · 4 answers · asked by Stephanie R 1

A major-league pitcher can throw a baseball in excess of 37.0m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0m away from the point of release?

2007-12-19 14:56:05 · 2 answers · asked by Anonymous

can someone explain particle spin in layman's terms. i dont need what particles have what spins, i already know all of that. just what a spin of 1/2 would mean or a spin of 2.

2007-12-19 14:52:26 · 4 answers · asked by Anonymous

Complete this sentence: Atoms emit visible and ultraviolet light as ________.

a. electrons jump from lower energy levels to higher levels
b. the atoms condense from a gas to a liquid
c. electrons jump from higher energy levels to lower levels
d. they are heated and the solid melts to form a liquid
e. the electrons move about the atom within an orbit

2007-12-19 14:50:09 · 7 answers · asked by Anonymous

Four point charges q = +3.4 µC are arranged in a square of edge length 1.9 cm.
What is the electric potential at the center of the square?

2007-12-19 14:44:25 · 1 answers · asked by romaine_style 1