Physics - January 2007

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I would think a message could be transmitted faster than the speed of light based on whether or not an interference pattern developed.

2007-01-21 11:59:17 · 1 answers · asked by LGuard332 2

from the earth, the distance to the center of our galaxy is 24000 light years. from the frame of reference of photon of light travelling from earth to center of our galaxy, what is this difference?

i dont really get the q and have no idea how to answer.

please help me,
thanks^^

2007-01-21 11:55:08 · 2 answers · asked by Anonymous

calculate the weight of a 5-kg box in newtons. remember the force of gravity on earth is 9.8 m/s2

2007-01-21 11:47:07 · 9 answers · asked by Someone in gresham 1

Why can't an object with mass go the speed of light? What would happen to lengths and time at the speed c?

2007-01-21 11:39:04 · 9 answers · asked by Anonymous

An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.32 10-11m. What is EPEfinal - EPEinitial, which is the change in the electric potential energy?
J

2007-01-21 11:33:51 · 1 answers · asked by Taylor W 1

(a) What is the electric potential a distance of 2.5 * 10^-15m away from a proton? (b) What is the electric potential energy of a system that consists of two protons 2.5*10^-15m apart -- as might occur inside a typical nucleus?

2007-01-21 11:18:49 · 1 answers · asked by Anonymous

Please answers quilky need answer fast.

2007-01-21 10:22:32 · 7 answers · asked by Josh 2

Is it possible, or could it be possible in the future to freeze a sound or light wave?

2007-01-21 10:20:29 · 10 answers · asked by Anonymous

an electric field of 640V/m is desired between two parallel plates 11.0mm apart. How large of a voltage should be applied? How do I arive at the answer?

2007-01-21 09:51:32 · 1 answers · asked by Anonymous

2007-01-21 08:48:36 · 5 answers · asked by ??♥ 1

2007-01-21 07:28:56 · 4 answers · asked by Dr. Chapatin 2

Say a car crashes into a mountain at 3mph.

If it were going 20 times faster then that it would produce a collision *400* times worse, with 20 squared times the energy.

Why is the car still only 20 times harder to stop?

2007-01-21 07:21:38 · 3 answers · asked by JA 2

if I rub certain material with differring cloths I can charge or dischage sufaces and this does not chang the element. so could someone in simple terms explain.

2007-01-21 07:10:02 · 7 answers · asked by Anonymous

2007-01-21 07:09:27 · 5 answers · asked by Anonymous

f is + if the mirror is a concave mirror
f is - if the mirror is a convex mirror

what dooes this mean?(lense-makers equation 1/f=1/distance of objct+1/distance of image)

ok, so does this mean that if im solving a problem for a concave mirror, and lets say the problem says the focal point is 15 cm away. Do i plug in -15 into the equation instead of 15? because of

f is "-" if the mirror is a convex mirror

2007-01-21 07:06:57 · 1 answers · asked by Anonymous

2007-01-21 07:03:51 · 5 answers · asked by car292335 1

(the effects of exerting pressure on air and water in closed systems)

2007-01-21 07:01:14 · 5 answers · asked by Anonymous

What are they measuring?

2007-01-21 06:40:24 · 6 answers · asked by JA 2

2007-01-21 06:23:20 · 12 answers · asked by Sarah F 1

Can you please answer this by typing a few, fun, everday examples of inertia!

2007-01-21 06:21:57 · 11 answers · asked by smoothieblender 2

The overall heat transfer coefficients (U-Values) are key factors in a cooling/heating load calculation as required for the sizing of HVAC equipment. Such values are generally taken from tables for different wall arrangements and materials and climatic conditions. out-line the theory behind the U-Value evaluation and to apply it to evaluate the U-Value of common walls in building industry (composite walls made of hollow bricks, plasters, coatings, etc…). Comparison with similar values taken from the tables is required along with an analysis of possible discrepancies

2007-01-21 06:15:03 · 1 answers · asked by Anonymous

is it possible to change a direction of force by deforming a shape?
for example imagine you got a cylinder and you apply a force from top now if you bend the cylinder does it change the force direction?
if yes how do you describe the reason?
thanks^^

2007-01-21 05:54:10 · 3 answers · asked by farshid hss 2

When I was breaking down some boxes recently, I snapped the tape and I could of sworn I saw a tiny blue spark. I did it again on another corner, then turned the light off and did it again. I saw sparks all three times. How can this be? I hope I didn't just stand up too quick?

2007-01-21 05:42:09 · 6 answers · asked by Boba Dub 1

Suppose we have 2 rigid rods, immensely long, with absolutely no elasticity. If we hold the rods
so that they cross a few meters in front of us at some point A. Now slowly move them
towards a parallel direction, the intersection point, P of the 2 rods will move away from us at an
ever-increasing rate.

The intersection point P will surpass the speed of light apparently, but why?

2007-01-21 05:26:14 · 4 answers · asked by sh 1

Consider a sphere of surface area A and volume V. The volume of some other sphere that has twice the surface area (i.e. 2.00 A) is..

are they saying that the second sphere's surface area is 2.00..or you have to multiply by 2.0

2007-01-21 04:49:04 · 6 answers · asked by Anonymous

How does an illuminated area on a screen change as a point light source moves away?

Now at first, i would guess that it gets larger, but when i think about it, wouldnt the illuminated area be the EXACT same? Since light comes out in infinite rays around a point source, the whole screen would be lit up close AND far away right?

either from close up or far, you can ALWAYS draw a ray connecting the point and any part of the screen right? does that mean the whole screen will be lit up no matter where the point light source is?

I dont know, i drew a ray diagram, but im still so confused Can someone help?

2007-01-21 04:21:29 · 4 answers · asked by Anonymous

A river is flowing from west to east at aspeed of 5 metrs per minute. A man on th south bank of the river, wants to swim across the river in th eshortest time. He should swim in whish direction?

2007-01-21 04:04:40 · 7 answers · asked by Anonymous

Rain is falling vertically . A man running on the road keeps his umbrella tilted but a mn standing on th estreet keeps his umbrella vertical to protect himself from the rain. Both of them keep thier umbrella vertical to avoid the sun rays. explain

2007-01-21 04:00:20 · 9 answers · asked by Anonymous

It's a mysterie to me!

2007-01-21 03:58:03 · 9 answers · asked by J F 1

2007-01-21 03:55:46 · 8 answers · asked by Anonymous