Physics - January 2007

How do reflective objects, such as street signs or vests, function? How do they work so effectively when light is shined on them in the dark.

2007-01-04 15:14:08 · 3 answers · asked by Cassi 2

I am in higher secondary school now..i'm doing a project on Internal Resistance of a Cell and its Variation...i need some material to be added to the project..can u please tell me some useful sites where i can get the info required?..remember, remember, i am in higher secondary..so the information has to be upto the level..please!!!!!

2007-01-04 15:02:55 · 3 answers · asked by Sachin 2

I can't stand the sound when trying to go to sleep, and am wondering why clocks make such an annoying noise.

2007-01-04 14:56:40 · 11 answers · asked by Buckdog06 2

2007-01-04 14:55:49 · 15 answers · asked by kardris05 2

Theoritically if I could ride a plane travelling at the speed of light and hold a mirror infront of me... what would I see considering that my image is also travelling at the speed of light? (Relative to light it will be faster than light)

2007-01-04 14:55:14 · 7 answers · asked by Aga 2

before a lighter person.

2007-01-04 14:54:09 · 12 answers · asked by goldeneagle 3

2007-01-04 14:47:59 · 5 answers · asked by RAGE 2

we know that after light passes through a higher density matter(e.g prism) its speeds reduced and causes a phenomena what we referred to as refraction. However, after it has passed the matter light is able to retain its normal speed again. So, how come light is able to return to its normal speed after losing its speed while passing through the matter?

2007-01-04 14:47:09 · 7 answers · asked by anjoi_05 2

than lighter cyclists.

2007-01-04 14:43:53 · 11 answers · asked by goldeneagle 3

Would the top surface of mercury in a glass container be the same shape as the top surface of water in a similar container? Give the reason for your answers.

2007-01-04 14:39:31 · 2 answers · asked by josh h 3

physics

2007-01-04 14:33:59 · 5 answers · asked by Abdu K 1

2007-01-04 14:29:50 · 5 answers · asked by nagu 1

Alright, basically I want to know if alternating current applied to an electromagnetic coil near a magnetic field pulsing at the same frequency will boost the magnetic field more than the electromagnet alone would. Also, would an alternating magnetic field, when spun fast enough, create a slight repelling force?

2007-01-04 14:09:06 · 2 answers · asked by Lockblade 1

a sled was pushed up a 25 degree inclined plane reaching a max vertical height 1.35m higher than it was when it first started .. what was its initial speed?

HELP PLEASE!

2007-01-04 13:51:26 · 4 answers · asked by pmwschoolstore 1

2007-01-04 13:19:20 · 8 answers · asked by elisaul 1

2007-01-04 13:18:47 · 6 answers · asked by elisaul 1

2007-01-04 13:12:04 · 14 answers · asked by tabloms 1

2007-01-04 12:44:46 · 14 answers · asked by Zulu 1

What if humans existed like frequencies on a radio? Their could be multiple existences going on right now, but you only know of the ones on your frequency. What if you were standing right next to someone right now, but you would never know because they are on a different frequency? This is an actualy theory, does anyone have any comments or explanations?

2007-01-04 12:18:24 · 13 answers · asked by memphis0013 2

which would be more damaging to your car: having head-on collision with an identical car traveling at an identical speed or driving head-on into the Vehicle Research Center's 320000 pound deformable crash barrier?

can you explain?

2007-01-04 12:16:02 · 6 answers · asked by Alex M 1

2007-01-04 12:10:58 · 3 answers · asked by one14life11 1

2007-01-04 12:07:59 · 3 answers · asked by ♥Happy Holidays♥ 1

2007-01-04 11:27:52 · 1 answers · asked by Anonymous

2007-01-04 11:19:31 · 4 answers · asked by tankaboy91 1

2007-01-04 10:41:25 · 4 answers · asked by Jeffrey W 1

The answer is 681.66, but i don't get some of the steps to reach that answer. Can someone explain the steps to me?

A woman stands on a scale in a moving elevator. Her mass is 63.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9500 N. What does the scale read during the acceleration?

2007-01-04 10:24:33 · 5 answers · asked by Rafael 2

(NOTE: The satellite moves in a circular orbit around the Earth at a speed of 4114 m/s and its altitude above the surface of the Earth is 17122000 meters.)

___ hours

2007-01-04 10:19:24 · 1 answers · asked by Anonymous

Aside from the just-as-outrageously-desperate-and-vague-as-those-gullible-believers explanations that videographers and alledged "experts" seem to always come up with?

Can electormagnitism or Quantum Mechanics somehow offer an explanation

2007-01-04 10:15:10 · 4 answers · asked by Smokey 2

I'm doing a project in my physics class where we have to build a DC motor powered by one AA Battery.

Mine didn't work, and I need to find the answers to these questions.

-What happens to the direction of the motor's spin when the battery is placed in the opposite direction?
-What will happen to the direction of the spin of the motor if the commutator is rotated 180 degrees?
-What will happen if the commutator is placed in the same plane as the armature?
-What happens if you connect 2 batteries to the motor? 3 batteries? A 6V battery?
-How would you redesign the motor so it could run on 15 Volts?

2007-01-04 10:05:36 · 3 answers · asked by zburritoman 1

been informed that light gaps in between photons reflects of dust particals therefore filling the spaces so therefroe the beam is then intact as a beam!!!! and not a series of seperate photons with spaces , but wot if a space is not filled with a dust particle but is empty as in say a vacum , it this space then in total darkness and what then happens to these spaces in my first question come on guys i need convincing here also but dosent light only reflect of something when it hits it and not until ?

2007-01-04 09:49:18 · 12 answers · asked by fragmaster3sum 2