Physics - March 2007

2007-03-24 14:26:43 · 2 answers · asked by fAtiN hAsEgAwA 1

I know that there are a few existing questions about boxes lined with mirrors, but this is an interesting twist. Assume that when light hits a surface, precisely half of it is reflected and half of it escapes the box. The mirrors are lined up with as perfect exactitude as humanly possible - this means that it looks perfectly cubic to us, but, for instance, if you were to shine a torch with a linear beam at one wall it would not go straight back into the torch. Now, if you were to shine it into, say, one corner from the opposite corner, the light would go off in every direction, and bounce around interminably (that is, until the beam's intensity became infinitesimal from being halved so many times) - but would the torch, based in its own corner, end up with the same amount of lighting on it as the corner the beam is on?

2007-03-24 14:15:53 · 1 answers · asked by antondevey 1

What causes the reaction: the arabic gum in the mentos allows the surface tension of the liquid to be broken more easily, allowing the carbon dioxide trapped in the bubbles to be released very quickly which creates the pressure for the explosion.
What is carbon dioxide: a colorless, odorless, incombustible gas.
Carbon dioxide is the reason for the explosion that was caused during the experiment. If there wasn't any carbon dioxide in the diet coke then there would have been no explosion or reaction.

2007-03-24 14:04:36 · 4 answers · asked by Anonymous

a beam of electrons moves from the back to the front of a room. The beam is deflected rightward, when facing the back of the room, by a magnetic field. What is the direction of the field causing the deflection and why?

2007-03-24 13:54:25 · 4 answers · asked by nybabyblu 6

Using
- a small 9 volt battery
- wire
- long iron nail
- thin copper wire

also is that enough or do you need more materials?

i need the electromagnet to test the strength of it by changing one variable.

2007-03-24 13:39:26 · 4 answers · asked by Anonymous

What is or how do I calculate the gravitational constant for a millisecond?

2007-03-24 13:35:15 · 3 answers · asked by Rob W 2

2007-03-24 13:30:22 · 2 answers · asked by Mujahid E 2

by the way he snores and kicks. Thanks for the feedback

2007-03-24 12:56:40 · 5 answers · asked by spicy23 2

2007-03-24 12:54:41 · 6 answers · asked by spicy23 2

2007-03-24 12:14:31 · 3 answers · asked by JAMES 4

can somebody please explain why the deeper you dive into the sea, the pressure will increase? and where does that pressure come from?

2007-03-24 12:02:30 · 6 answers · asked by      7

(not that i want to make one or anything) :]

2007-03-24 12:00:05 · 13 answers · asked by Anonymous

Please answer in *figs*

2007-03-24 11:54:09 · 5 answers · asked by Yahoo! 5

- There's air in the coffin but how does the air run out? You breathe air in and it comes right back out so how do you suffocate? I just need an explanation...

2007-03-24 11:49:47 · 13 answers · asked by Anonymous

I know that W = mass x G, where G = 9.8m/s squared

So, if something has a mass of 100kg on Earth, will the calculation for its weight be 100 x (9.8 x 9.8) ?

2007-03-24 11:38:24 · 3 answers · asked by Anonymous

2007-03-24 11:28:07 · 9 answers · asked by Anonymous

2007-03-24 11:14:47 · 21 answers · asked by xxpink_carnationxx 1

KE = 1/2 mass X velocity squared

SO, what would KE be if mass = 100 kg and velocity = 5 m/s?

1/2 (100) x ???? = KE

2007-03-24 11:03:41 · 10 answers · asked by Anonymous

I don't really understand why the voltage in the neutral wire of an electrical instrument is zero, and there still be a current in that wire. I'm talking about AC power in our houses.

2007-03-24 10:32:03 · 5 answers · asked by tasd 3

where G (on earth) = 9.8 m/s squared

2007-03-24 10:30:29 · 2 answers · asked by Anonymous

I got half of this problem correct so far
. A diverging lens (f = -10 cm) is located 20.0 cm to the left of a converging lens (f = 31.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.
(a) Determine the distance of the final image relative to the converging lens.
I got this answer correct, -121.15 cm
(b) What is the height of the final image (including proper algebraic sign)? in cm
I know that hi/ho = -di/do but I'm not getting the correct answer. Any help will be appreciated.

2007-03-24 10:27:23 · 1 answers · asked by Confused 1

will there be a difference in
brightness, will one light bulb be brighter than the other?
will one be more costly to run per currency unit per unit of electricity, than the other (given that the costs were the same for comparison purposes) ?
then, could one say that for example (like shoe sizes) that a 115volt x 100watt usa light-bulb is equal to a 230volt x 50watt light-bulb in London.?
or, if each are equally bright to read by the difference would be in the energy consumption and efficiency of the different volltages; then, which one usa or London?
I am not an electrician, but a philosopher; puzzelled by this for ages!

2007-03-24 10:24:41 · 5 answers · asked by D a n 2

How would I measure the frequency of a tuning fork that was unmarked?

thank you

2007-03-24 10:24:18 · 2 answers · asked by Anonymous

I need help understanding and explaining a problem...

1. When sound waves pass from air into water, their speed increases by a factor of 4. This means that either the wavelength or the frequency also increases by a factor of 4. Which is it? Explain.

thank you

2007-03-24 10:19:31 · 4 answers · asked by Anonymous

2 different kinds of watts light bulbs produce different heat

2007-03-24 10:18:54 · 3 answers · asked by tykira l 1

the clocks go foword tonight / tomorow morring

2007-03-24 10:13:12 · 11 answers · asked by ak222002 4

I thought this was true, but heard differently on TV.

2007-03-24 10:04:49 · 12 answers · asked by Anonymous

...Via radioactive fallout or some other vector in harmful doses?? How small of a radioactive dose is harmful?? it has been ascertained in the studies done by government radiation releases over the town of Hanford that small exposures to radiation are likely to have highly adverse effects on the human thyroid gland... frequently resulting in thyroid cancer. Small doses of radiation also may cause a high rate of birth defects...

Please try to support your responses with useful information... this is something we should all discuss before advocating use of nuclear force on the middle east with our loved ones deployed in the region.

Plus I just really want to know... because I thinks its important.

2007-03-24 09:59:33 · 2 answers · asked by Anonymous

absolute zero is the condition in which atoms (particles) are completely still have no movement at all. I wish to find out how scientists are trying to achieve absolute zero since so far it has never been achieved

2007-03-24 09:50:46 · 7 answers · asked by Bobbyshoemaker 1

three capacitors of 1.5, 2.0, and 5.0 uF are joined together in parallel. What is their equivalent capacitance?

could you help me? thanx

2007-03-24 09:24:14 · 2 answers · asked by shiriguro 1