Physics - August 2007

suppose u r pressing a spring, and in return it will also give a resisting force on ur hands. according to newton, energy is neither created nor destroyed, then from where does the spring get energy continuously to resist the force applied on it untill u remove ur hands.

2007-08-07 16:29:07 · 8 answers · asked by Anonymous

1. A unifrom electric field with a magnitude of 250 N/C is directed in the positive x direction. A 12 C charge moves from the origin to the point ( 20.0 cm , 50 .0 cm). What is the change in the lectrical potential energy of the system as a result of the change in position of this charge?

2. What is the chage in the electrical potential energy in a lighting bolt of 35 C of charge travel to the ground from a cloud 2.0 Km above the ground in the direction of the field? Assume the electric field is unform and has a magnitude of 1.0 * 10 ^ 6 N/C.

2007-08-07 15:57:55 · 1 answers · asked by confused ~ 1

Let's try this again. I typed in 'c' for 'v' by mistake in the eariler question. My bad.

So, about the equation ' E=1/2MV^2' ? Can the answer to practical space travel be found in this equation?

2007-08-07 15:22:32 · 6 answers · asked by Doc Watson 7

Im not sure that i understand exactly what the fourth demention is but from what i've read, watched people describe it as time ... when i think about that i wonder is it possible to be a fourth dementional being considering the fourth demention is just a timeline of something, so if you know your past and future all in one... how would you exist.... this is probley a stupid question and or it doesnt make sence... but yeah

2007-08-07 15:07:55 · 4 answers · asked by Brandon P 2

Drywall,1.3cm(0.50in) R-value 0.45
Wood Shingles (overlapping) R-value 0.87
Flat glass 0.318cm(0.125in) R-value 0.89
Hardwood siding 2.54cm(1.00in) R-value 0.91
Vertical air space 8.9cm(3.5in) R-value 1.01
Insulating glass 0.64cm(0.25in) R-value 1.54
Cellulose fiber 2.54cm(1.00in) R-value 3.70
Brick 10.2cm(4.00in) R-value 4.00
Fiber glass batting 8.9cm(3.5in) R-value 10.90

Assume an area of 1.0m2(squared) and a temperaturedeffrence of 20.0 celsius

2007-08-07 14:56:51 · 1 answers · asked by Anonymous

I have a red laser and I want to make it burn... I saw how to make a green one burn but i'm not sure ho to make a red one burn... please help!?

2007-08-07 14:51:22 · 1 answers · asked by Matt W. 2

Every minute in our life experience on earth is a part of the forever expansion of the universal growth, it's as perfect as a math formulation.

If you believe the same, can you show me more?

2007-08-07 14:32:04 · 5 answers · asked by Anonymous

Sincere question, please, sincere answers.

Where does this dark matter fit into the equation? Everything has an opposite. Matter/Antimatter. Does this equation become a triangle?

2007-08-07 13:56:10 · 3 answers · asked by Anonymous

i believe Nikola Tesla was the most important genious since Da Vinci. i believe so because of his inventions that change every single person on our earth today. Einstien didn't have much other than his equation. Tesla however, wasnt popular because of the hate toward from edison who was popular and led People to think he was crazy. Here is an article off the internet i found




Nikola Tesla was the first to blaze the trail for the creation of incredible, world transforming devices that we, in the world of today, take for granted. Tesla invented such things as: radio, the bladeless turbine, wireless communication, fluorescent lighting, the induction motor, a telephone repeater, the rotating magnetic field principle, the poly-phase alternating current system, alternating current power transmission, Tesla Coil transformer, and more than 700 other patents.

http://home.earthlink.net/~drestinblack/teslatoc.htm

2007-08-07 13:33:19 · 11 answers · asked by Anonymous

Well I was wondering, if the velocity stays the same, say goes at five hundred m/s constantly.

Then does that mean that it has no force, since it has no acceleration...? I mean, you are still moving at 500m/s, so how can that have no force?

Please Explain

2007-08-07 12:45:32 · 6 answers · asked by xblah900x 1

I am confused with this.
Is matter just consiousness in form - a form which we create?

2007-08-07 12:45:12 · 5 answers · asked by Precious Taboo 2

i know my wording isnt all that clear, but any one know of some thing you can put between a magnet and some metal that would keep the metal from sticking to the magnet?

2007-08-07 12:31:43 · 8 answers · asked by mrhuntern 2

Entanglement - how do we know the twin also colapses **at the same time** when we collapse the first one?

2007-08-07 12:23:15 · 1 answers · asked by San 1

Can't we use heat's tendency to rise to create energy? Doesn't it displace anything?

2007-08-07 11:47:25 · 5 answers · asked by Anonymous

2007-08-07 10:04:40 · 9 answers · asked by Anonymous

after 2.00 days, the activity of a sample of an unknown type of radioactive material has decreased to 84.2% of the initial activity. What is the half life of this material.

2007-08-07 09:41:17 · 4 answers · asked by yahoo addict 1

Does it feel like falling endlessly, or like being on a roller coaster?

2007-08-07 08:54:53 · 4 answers · asked by Anonymous

There's been some excitement lately with scientists in the UK revealing that they've been able to use meta-materials to create a positive Casimir Force. This got me thinking that if gravitons have a wavelength would it be possible to create a metamaterial that would have a negative refraction index for them?

2007-08-07 08:54:15 · 3 answers · asked by Anthony N 1

Does anybody knows to explain me (qualitatively) why electromagnetic field exists in cladding layer even if the total internal reflection condition is satisfied?
Does it mean that for example: laser ray contains electromagnetic field beyond its visible track or what? It doesn't seems logical to me.

2007-08-07 08:32:10 · 4 answers · asked by lanmikus 2

2007-08-07 08:30:25 · 6 answers · asked by a.X.n 1

When propellors move fast, we are able to (kind of) see each individual blade move slowly, usually bluish on colour. At times, it is in the opposite direction of the actual blade movement.

2007-08-07 08:29:38 · 4 answers · asked by a.X.n 1

http://www.youtube.com/watch?v=cXsvy2tBJlU

2007-08-07 08:18:57 · 3 answers · asked by Anonymous

2007-08-07 08:15:55 · 7 answers · asked by Anonymous

when pressure is at 25 m bar and the temp is 25c

2007-08-07 07:03:58 · 3 answers · asked by rama k 1

When a radar detector goes off is it a sound wave that is being shot at it? Are radar and sonar waves able to interferring with each other? Does pitch have anything to do with radar?

2007-08-07 06:42:34 · 12 answers · asked by Joseph C 2

explain?

2007-08-07 06:37:47 · 7 answers · asked by sara.girl122 1

atoms are made of electrons, protons, and neutrons.
A. which has the most mass?
B.which has the least mass?
C. what is the charge on each?

2007-08-07 05:29:01 · 11 answers · asked by Anonymous

2007-08-07 05:10:45 · 7 answers · asked by Anonymous

if inside cylindrical material magnetic induction=bR^a where b,a are constant and R is radial distance from axis of cylinder then find current density ie J (current/area) as function of R

2007-08-07 04:57:06 · 4 answers · asked by miinii 3

Two cars are 15 kms apart. One is turning at a speed of 50kmph and the other at 40kmph . How much time will it take for the two cars to meet?


plz solve with explanation.

2007-08-07 04:13:32 · 3 answers · asked by Lolla 2