Physics - January 2007

why pair production need mass enviornment?

2007-01-12 08:38:04 · 3 answers · asked by a 3

why pair production need mass?

2007-01-12 08:36:59 · 2 answers · asked by a 3

why pair production need to be happen in an enviornment that include mass?

2007-01-12 08:32:45 · 4 answers · asked by a 3

A shop sign hanging off the edge of a wall weighting 201 N is supported by a uniform 129 N beam of length = 1.70 m. The guy wire connecting the sign is D=1.36 m from the backboard. The angle the uniform beam supporting the sign and the wall makes is 39.2 degrees.

What is the tension in the guy wire?

What is the horizontal force exerted by the hinge on the beam?

What is the vertical force exerted by the hinge on the beam?

I have been working on this for hours but all the teacher has given us to work this problem is a torque equation, which I don't think helps in this question. Please help!!!

2007-01-12 07:39:27 · 5 answers · asked by Anonymous

2007-01-12 07:21:24 · 14 answers · asked by Anonymous

moving charges/current creates a magnetic field around the conductor.so why dosent an electron?if it does why arent all objects magnetic?

2007-01-12 07:18:28 · 13 answers · asked by leo 1

2007-01-12 06:55:27 · 7 answers · asked by chantellerown 15 1

You have nothing else besides those two things.

2007-01-12 06:40:54 · 10 answers · asked by madeulo0k 2

like through the ground coming up through the roots?

2007-01-12 06:09:29 · 5 answers · asked by Dayne's gal 2

If subatomic particles can come into existence and disappear spontaneously... then why are atoms (and other, larger objects which are composed of atoms, such as rocks, trees, houses...) not able to spontaneously "appear" and "disappear"?

2007-01-12 06:06:34 · 10 answers · asked by Kilroy 4

2007-01-12 06:00:11 · 15 answers · asked by billy s 1

2007-01-12 05:48:51 · 5 answers · asked by wuzzbert 1

a. what is the wavelength of the wave?

b. what is the period of the wave?

2007-01-12 05:17:53 · 3 answers · asked by Anonymous

Some say it is heavier than the air, and some say it is lighter than the air. Which is true? If you are a chemistry major, your answer would be very appreciated.

2007-01-12 05:11:27 · 5 answers · asked by Curious_man 2

It is my birthday on 6th August and it would be nice to celibrate it with a bang

2007-01-12 04:53:29 · 13 answers · asked by Anonymous

2007-01-12 04:44:52 · 5 answers · asked by demonfish1556 1

I was asked how did scientifics determined which charge to be called positive and which to be called negative (+), (-). If you make an experimental measure, you can get either two charges that attract each other or that repel each other, but you don't know which one to call positive and which to call negative. Could it be that this convention comes from the magnetic flux around a magnet? I need this answer urgently, please.

2007-01-12 04:08:07 · 8 answers · asked by Novelo 1

a-it has a definite volume but not a definite shape
b-it has a definite volume and a definite shape
c- it has a definite shape but not a definite volume
d- it has neither definite shape nor a definite volume

2007-01-12 04:03:53 · 22 answers · asked by deibe8489 1

a) Its a suggested answer to a question
b) It can be changed when new discoveries are made
c) It cant be reproduced many times
d) It represents the end of the scientific process.

2007-01-12 03:55:45 · 12 answers · asked by deibe8489 1

Maybe at least the engine block would make it to earth as a fireball and what would be the splash size then? Would it create a big enough wave in a giant lake, like as big as the Great Salt Lake?

2007-01-12 03:51:38 · 9 answers · asked by dreamelixir4453 3

2007-01-12 03:14:31 · 5 answers · asked by chow_dna 1

2007-01-12 03:10:09 · 6 answers · asked by Chi Chi 1

when an electron passes through a flourescent tube why is the gas not atracted to it

2007-01-12 02:55:26 · 13 answers · asked by robert h 1

Does centrifical force of the earths rotation make us lighter at the same time? I've always wondered.

2007-01-12 02:34:41 · 9 answers · asked by Timothy S 6

2007-01-12 02:22:20 · 10 answers · asked by Anonymous

If ur answer is 'YES' can u prepare tea with this boiled water?

2007-01-12 01:46:58 · 19 answers · asked by uni_wax 2

2007-01-12 01:46:22 · 7 answers · asked by Anonymous

2007-01-12 01:24:23 · 4 answers · asked by Anusha R 1

2007-01-12 01:17:19 · 7 answers · asked by chris v 1

I was travelling in a taxi that was travelling at 70 mph however there were mosquitos inside the car flying around the car as if it were stationary. How is it that these mosquitos who were not connected to the car in anyway could fly at over 70 mph even when the car changes speed at stoplights etc. Please give me the facts behind the explanantion.

2007-01-12 00:52:14 · 6 answers · asked by B.R.E 2