Physics - May 2007

is it true that you can use it to transmit electricity wirelessly???
if so whats the efficiency ????

2007-05-19 16:04:47 · 3 answers · asked by saggy 2

2007-05-19 15:52:25 · 7 answers · asked by Anonymous

2007-05-19 15:48:49 · 7 answers · asked by Anonymous

A wire of resistance 10 ohm is bent in the middle at 18 degree .Its two halves are mutually connected.Its new resistance will be
1. 10 ohm
2. 30 ohm
3. 5 ohm
4. 2.5 ohm

2007-05-19 15:39:18 · 2 answers · asked by godisgreat 1

2007-05-19 15:36:54 · 3 answers · asked by Anonymous

a cube is constructed by joining 12 similar wires,each of resistance 6 ohm,current enters at one corner and leaves at diagonally opposite corner of the cube.the equivalent resistance between these two corners will be--
1. 12 ohm
2. 6 ohm
3. 5 ohm
4. 1 ohm

2007-05-19 15:27:39 · 3 answers · asked by godisgreat 1

2007-05-19 15:25:52 · 2 answers · asked by Anonymous

Wouldn't the earth just have to go back to the same exact place where it was at that time you want to go back to, because think of how fast we're moving. So is time travel possible at all?

2007-05-19 15:08:58 · 15 answers · asked by Cosette 2

2007-05-19 13:49:09 · 6 answers · asked by Herschel 1

2007-05-19 13:48:31 · 8 answers · asked by Herschel 1

I need to know the name of that thing that you see in science museums sometimes. The toys that are like it are called marble runs, but I'm looking for those cool things with tracks made of metal that have balls falling spinning and running around all over. Anyone know?

2007-05-19 13:45:46 · 1 answers · asked by Anonymous

plz

i want to know the minimum of g that must the suppositry bear according to usp

i think it is called
breaking test

can u help?

2007-05-19 13:33:03 · 2 answers · asked by Anonymous

how did they solve them. (both uranium and plutonium bomb) i dont know.

2007-05-19 13:05:44 · 4 answers · asked by Anonymous

Hi. I want to make my own Xray ...
but what I really need to do is figure out how to make a voltage across two parallel plates with the stuff that i would typically find at home @

Also ...How hot would I typically have to heat something so it emits a gamma ray ..is this possible?? Do all things when heated (I know they must emit infared radiation and if they're incadescent -then some in the visual spectrum and possible UV rays if glowing more than White hot) -- but what about Radio waves to gamma rays??

Thnks.

2007-05-19 12:49:51 · 2 answers · asked by Anonymous

Here is a question on my homework that is very puzzling:
So you have a 9V battery that is connected to 4 light bulbs. First is a parallel circuit with a 50w and 25w bulb. Next is a single 40w bulb, and last is a 25w bulb. What is the current that flows through these, and how does the voltage change?

2007-05-19 12:33:34 · 5 answers · asked by tallahasseeman 1

2007-05-19 12:27:52 · 2 answers · asked by Sonia Q 1

2007-05-19 10:51:22 · 8 answers · asked by Anonymous

A 40 g block of ice is cooled to -68°C. and is then added to 620 g of water in an 80 g copper calorimeter at a temperature of 22°C. Determine the final temperature of the system consisting of the ice, water, and calorimeter. Remember that the ice must first warm to 0°C, melt, and then continue warming as water. The specific heat of ice is 0.500 cal/g °C = 2090 J/kg°C.
_________°C

2007-05-19 10:44:18 · 1 answers · asked by Emma 1

I know that antimatter exists-or used to exist, and that matter is just energy in a different state like what ice is to water, but does anti-energy exist or has it ever existed?

2007-05-19 10:32:20 · 16 answers · asked by Alanthegrey 3

how come microwaves in restaurants and other places can heat metal objects but our ones will give off sparks??
They just shove those foil dishes in.

2007-05-19 09:55:24 · 12 answers · asked by Anonymous

Hi, i have just swiched to virgin and was told by them that i will have a faster internet service and speed. Can someone tell me what speed is 11.0Mbps. Is it slow. They did say it would fluctuate from time to time because we have the internet tthrough the phonelines, (broadband).
The other day it read 54.0Mbps.
At the moment my internet is running slow, very slow. I can send an email through the post quicker.
Also, in a morning it runs rapid, so can someone explain why?
Thankyou.

2007-05-19 09:54:26 · 5 answers · asked by julie 6

2007-05-19 09:17:30 · 8 answers · asked by Anonymous

2007-05-19 08:37:22 · 22 answers · asked by Anonymous

2007-05-19 08:08:27 · 25 answers · asked by Bossman ™ 4

2007-05-19 07:49:04 · 5 answers · asked by Melanie 1

If black holes are the result of the density of matter, wouldn't that
mean that the big bang theory and black holes are mutually exclusive?

2007-05-19 07:44:48 · 4 answers · asked by Anonymous

2007-05-19 07:34:55 · 5 answers · asked by Anonymous

2007-05-19 07:30:54 · 7 answers · asked by rossmin 1

A 0.60kg mass at the end of a spring vibrates 3.0 times per second with an amplitude of 0.30m. what is the velocity when it passes the equilibrium point.

2007-05-19 06:58:49 · 5 answers · asked by Anonymous

I've got the deffinition of Q-factor in a laser cavity as
Q=2 x PI x energy stored in cavity / energy loss per cycle.
How do I find the energy stored in the cavity?

Basically, I've got the question:
"The output in a gas laser with a cavity length of 1m transmits 0.5% of the incident light at a wavelength of 488nm. Ignoring other losses in the system, calcuate the Q-factor of the cavity and the cavity lifetime."

(I've also got the cavity lifetime to be, Q= freq x cavity lifetime, for the last bit of the question.)

Thanks.

2007-05-19 06:35:25 · 1 answers · asked by bjh_101 2