if a man approached a plane mirror @ the rate of 2kmph,then his image would approach him at the rate of ?
344153
The image would approach him at 4kmph. The image of the person would be formed at a distance behind the mirror equal to the distance between the mirror and the person since a plane mirror has focus at infinity.  Now if a person moves 'x' distance towards the mirror, the image formed by the mirror would also move 'x' distance towards the face of the mirror. If the time taken by the both is constant (since the speed of light is much much greater than the speed of the man, this approximation can be safely taken), then they would approach each other with equal velocity. Hence the relative velocity would be 4kmph.
719623
There are 2 possible scenarios ::\n1) Mirror in your hand ::\n   Yes definitely u'll be able to see ur image as mirror is\n   also travelling at the same speed as u & so u both are\n   stationary with respect to each other.\n2) Mirror is stationary ::\n   No, because ur eyes wont be able to adjust to such a fast\n   transition.
133450
well, the usual rules of physics at such speed don't apply. so when you turn the headlights, the light will travel from them at approximately the usual speen of light, and i guess you won't notice anything unusual..\nfor more information check the subject at wikipedia. and the following subject: Constant velocity from all reference frames
66085
Earth is around, you know that. An aero plan has to fly around and it would be flying thousands of kilometers away from you.\n\n It would appear that the plane is flying so slowly. But if you see an aero plane that is flying on low altitude that would appear to be faster.\n\nSky is so wide, you can see larger area if you look further and further you can see more wide angle. \n\nIt is not same as if it is closer to you, the distance would be very small. If it is far distance is greater.
593131
The incident ray is perpendicular to the surface of reflection.\nThen one has the least distance case.
946998
since its a concave mirror, f = -31.6 cm\nlet object position be u and image position v\n\nmagnifivation m = - v/u = h'/h      h is abject size n h' image size\nresulting image is uprigth so h' is +ve and is 6h\n- v/u = 6 or v = -6u\nby mirror formula 1/v+1/u=1/f\n1/u = 1/f-1/v\n1/u = 1/f + 1/6u\n5/(6u) = 1/f\nu = f * 5/6\nu = 31.6 * 5/6\nu= 26.3 cm(approx)\nits kept at a distance 26.3 cm from the pole of the concave mirror.
1028951
The example of each person going faster than the previous assumes a consistent additive nature of speed which unfortunately falls apart (shown by experimentation) as your speed approaches the speed of light.\n\nSpeed is not absolute in the sense that there isn't a universal stationary reference point.  If there were, then the example will apply.  According to experiments, however, something travelling away from you at light speed will do so regardless of whichever direction you happen to be moving.  This is not something to reason about (nobody arbitrarily made up this rule so that philosophers can find loopholes around); it's just what's been observed so far.\n\nThe Wikipedia article at http://en.wikipedia.org/wiki/Speed_of_light explains it a lot better than I can.  Jump to the section "Constant velocity from all reference frames" for the discussion applicable to this example of yours.\n\nHowever, an article at http://science.howstuffworks.com/news-item6.htm suggests that at least two experiments (pending validation) may have found exceptions?
985833
I think I understand your experiment.  I'm standing at the anulus observing.  I see the light from the lighthouse.  Exactly one second later, I see the next flash of light from the lighthouse, no matter the radius of the anulus.  To satisfy (1) the perimeter of the anulus must be 186,000 miles, the diameter 186,000 miles / pi or 59,206 miles, and the radius d/2 = 29,603 miles.  That's about 7.47 times the earth's radius.  For (2), if you double the radius, you double the circumference.  Keeping the time the same, that doubles the speed.  You already knew that.\n\nFor (3), at the lighthouse you see the reflection of the lighthouse beam.  To reduce confusion, you could do what real lighthouses or bouys sometimes do:  alternating rotations are a different color.  But what you would see is the reflection, but delayed by 1/pi seconds, or 318 milliseconds.\n\nI'm guessing at your response.  At z=2D, this 'intersection' is travelling at twice the speed of light.  There's no physics problem with that.  It's not conveying either matter or information faster than the speed of light.  You have just contrived two events closer in time to each other than the time light would take to go between them.
652091
try to get closer to him and don't do it too fast.
233087
this is where relativity comes into play. It depends from what viewpoint. speed is always relative to a "fixed" point (which might not be so "fixed" after all). get my drift?
400952
Use 1/s+1/s'=1/f  where f=R/2, s is object distance (in this case negative) where the image of the first mirror is the object of the second.  s' is the image distance you are solving for.  I'll leave it for you to work out the details of your homework, but this should get you started in the right direction.
401228
An airplane flying in reverse of the earth's rotation will travel the same distance faster than one flying in the same direction as rotation.
916307
if light did not travel in a staight line then the mirror would make the light refract (focus)and since it does not it proves that light travels in a straight line
392981
Is the speed at which it travels.
724874
Answer is yes.  By "seeing", what we really mean is our eyes receiving light either reflected or emitted from an object.  It doesn't matter how fast the object is moving, or if it's approaching or receeding - the speed of light is constant, therefore you will see it both coming and going.  That's one of the beautys of relativity - the speed of light is not relative to the object it's coming from, but instead is fixed and will measure the same speed for all observers in the universe, moving or not.
193299
It would take infinite energy to accelerate you and your light fixture to the exact speed of light which would thus be impossible.  However, as you approach the speed of light, at ever greater fuel expenditure, your rocket ship would shrink in the direction of travel and you would become a "pancake" but not be aware of it.  When you turn on your light, the photons emitted straight ahead would travel at the speed of light, c.  Photons always travel at the speed of light in a vacuum.  it is not like shooting bullets ahead from a fighter plane where muzzle velocity is added to the speed of the plane.  Although Einstein's theories of relativity do apply to the plane and bullets as well as photons, the effects are almost undetectable at the very low velocities we ordinarily experience on earth.
943118
Since the light beam actually transfers momentum to the reflector, I believe you can "consider" that the photons have slowed down and reversed direction.  But that is not what "really"  happens.  The time it takes for 10m in one direction and two 5m paths is the same, as the velocities are identical in both directions.  The momentum of a photon is not related to its velocity (as it is in physical objects); it is a function of its wavelength only.