Physics - March 2007

do solar panels create electricity from the ultraviolet light created from the sun? because they only have an efficientcy of like 18% and this scientist found out a way to collect the visible light also, and he says the solar panel could have an effeciency of up to 80%! so my question really is, do solar penels creat electricity from heat? do you know of anything that can?

2007-03-08 00:34:28 · 4 answers · asked by Anonymous

2007-03-08 00:17:04 · 1 answers · asked by Sarah L 1

2007-03-08 00:09:54 · 7 answers · asked by christian_cag 1

I just wanna know whoever scientist or physicist found it...thank you.

2007-03-08 00:02:21 · 12 answers · asked by §hãðôw™ 4

2007-03-07 23:59:56 · 5 answers · asked by christian_cag 1

what is the difference between special theory of relativity and general theory of relativity?

2007-03-07 23:58:05 · 10 answers · asked by Anonymous

I've got the science exam tomorrow, please !

2007-03-07 23:53:02 · 1 answers · asked by Shy 2

and not like the "wont move" freeze but the -1000000 deg. c. or somethin.

2007-03-07 23:47:11 · 1 answers · asked by Anonymous

A 61.7 kg canoeist stands in the middle of her canoe. The canoe is 3.9 m long, and the end that is closest to land is 2.5 m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe. Suppose the canoeist is 3.4 m from shore when she reaches the end of her canoe. What is the canoe's mass?

Is there a simple way to do this problem? I can not seem to figure it out.

2007-03-07 23:38:51 · 1 answers · asked by PhyzicsOfHockey 2

2007-03-07 23:34:38 · 8 answers · asked by christian_cag 1

2007-03-07 23:28:53 · 4 answers · asked by malka m 1

If so, will we be able to go both backwards and forward in time, or just forward? It would seem to me that if we were able to go backwards in time, we'd be able to change things, thereby altering the past history of the world. What do you think? Personally, I can't even begin to fathom this concept.

2007-03-07 23:26:46 · 13 answers · asked by Anonymous

One description I remember from a class I took many years ago was that time was like a spring that was big on both ends, funnel shaped to the middle, constantly bouncing. And that Dejavu was when the springs of time touched at some point, allowing you to see into the future.

What is your description of TIME?

2007-03-07 22:59:07 · 5 answers · asked by Anonymous

2007-03-07 22:57:14 · 1 answers · asked by shahryar 1

explain the operation principle of an optical
fibre, and how it has changed the world of communication

2007-03-07 22:32:25 · 2 answers · asked by dania 1

2007-03-07 22:04:35 · 5 answers · asked by Anonymous

I have heard that electricity flows from positive to negative terminal and electrons from negative to positive. But is'nt the flow of electricity due to the flow of electrons?? How can that be true? Please explain.

2007-03-07 21:57:21 · 6 answers · asked by cute little 1

calculate the energy transferred in the light bulb when 20c of charge flows through it??

2007-03-07 21:39:13 · 4 answers · asked by Anonymous

what is max limit of iq score for a person to be genius

2007-03-07 21:23:31 · 9 answers · asked by Anonymous

I have to find the weight of 2 kilograms of yogurt.
If you could, please just explain the process. I want to try and get it myself.
Thanks!

2007-03-07 21:05:49 · 8 answers · asked by eqlar 3

Full question:
An elephant and a mouse would both have zero weight in gravity-free space. If they were moving toward you with the same speed, would they bump into you with the same effect?

Please explain as much as you can.

2007-03-07 20:57:02 · 3 answers · asked by eqlar 3

2007-03-07 20:33:37 · 5 answers · asked by jeheil 1

Twice the inertia? Twice the weight (when weighed in the same location)?

2007-03-07 20:27:38 · 9 answers · asked by eqlar 3

2007-03-07 20:24:48 · 1 answers · asked by jeheil 1

This is the two greatest scientist, i just want to know who is smarter between them.

2007-03-07 20:09:50 · 10 answers · asked by Engr. Ronald 7

2007-03-07 20:02:46 · 5 answers · asked by gebster c 1

2007-03-07 19:23:51 · 7 answers · asked by Anonymous

A hot piece of metal splaced in an equal mass of water. Which will have the greater temperature change, the metal or H2O? and why?

2007-03-07 19:17:44 · 6 answers · asked by totally_confused 1

2007-03-07 18:58:25 · 17 answers · asked by idealexplosives 1

her, I'm actually seeing a woman on a diffferent time line then the one I started off in, and my wife is in another parallel universe with a different time line. How can I get my real wife back?

2007-03-07 18:39:29 · 10 answers · asked by Anonymous