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How an observer sees your motion depends on how it compares with his own motion?
Wiki User
∙ 12y ago
If you are standing still and a car passes you at 60 mph it appears to be moving at 60 mph
If you are traveling in a car at 60 mph and a car alongside you traveling in the same direction at 60 mph it appears to be not moving, since the relative velocity is 0
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoYes that's true. But it's even worse than that. There's no such thing as your
'real' motion. All there is is your motion compared to whoever is observing it.
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Why must motion be with respect to the observer?
Imagine a person riding past in a car who looks at you says to you "I'm not moving. I am sitting still in my car. YOU are moving!"An airline passenger flying overhead then looks down at both of you, and reports "I'm up here sitting still, and BOTH of you guys are moving!".And an astronomer working at the observatory on the moon, taking a break and using his super-duper telescope to see what's shaking back on earth, watches the events on Earth and, and sees clearly that ALL THREE of you are moving.Now here's the important part: all perspectives are correct ! There is no such thing as absolute motion - all mostion is relative to the observer, or the person who is measuring the movement.
Why are rest and motion called relative term?
rest and motion are indeed relative terms take for example, you are standing on a platform and see a train speeding past you. the train is definitely in motion with respect to you. now, think of a passenger in the same train..to the passenger the train in at rest but he sees the platform speeding past him, meaning you appear to be in motion with respect to him... this concept is very much relative, as the earth like all the other planets including the sun are actually moving. so though the computer in front of you may seem to be at rest with respect to you, it is actually in motion if someone from the moon or some other planet sees it...:-)
How can a person see in slow motion?
Slow motion is a special effect used in movies, not an actual action. You have to train your body to move really fast. Martial art Masters are able to see novice fighters in slow motion because they are able to react really fast. A fly can dodge 95% of the strikes you send at it , because it's so fast that it sees you coming in slow motion. The moon is rotating around the earth at 3000 miles a hour , but the earth is rotating at 6000 miles a hour. so when you see the moon it looks like it isnt even moving. train yourself to move faster and things will seem slower.
Describe the Doppler effect?
VROOOOOOOMMMM! The change in pitch when a car speeds by, first higher (when approaching) then lower (when receding).The Doppler effect is the term we give to the apparent change in frequency of waves (often light or sound waves) as the distance between the source and the observer changes. If either the source or the observer of a wave is moving so that the effect is that they are getting farther apart or closer together, the Doppler effect will appear. Let's look more closely.If the distance between the observer and the source of a wave is decreasing because they are closing in on each other, something happens. The wave, which is normally characterized by a given frequency and an associated wavelength, will appear to increase in frequency (and decrease in wavelength). Let's get even closer and break it down a bit to see what happens.When a wave reaches at an observer, it has a given wavelength. If there is no change in the distance between that observer and the source that wavelength remains constant. But if the distance of separation is decreasing (say if the sensor - observer - moves towards the source 8motion is relative so it does not matter which of the source or sensor moves relative to any frame of reference), as the crests and troughs of the wave arrive the observer will be (apparently) "running towards the next peak or trough" of the wave. This makes the wave appear to have a shorter wavelength. The observer is "running to intercept" the oncoming wave and the next crest or trough will "arrive sooner" because of the relative motion. This gives the effect of a change of frequency of the wave, and it makes it appear higher in frequency (with an accompanying shorter wavelength).If there is no change in distance between the source and the observer, the wave has a given wavelength. When a crest of the wave arrives at the observer's position, it takes "x" amount of time for the next crest to arrive. That's the period of the wave, or the time it takes for one complete cycle of the wave to occur. If the source and/or observer are/is moving relative to one another and the distance is closing, the "next crest" will "arrive sooner" and the period of the wave is effectively reduced. A shorter period of a wave equates to a higher frequency and a shorter wavelength. As the distance between the observer and the source opens, the opposite effect can be seen. Doppler effect isn't too tough to get a handle on if you work with it and think it through.If you've ever stood beside a roadway (or railroad track) with a vehicle (or train) coming toward you at speed, it has a given pitch (frequency). As it passes and moves away, the pitch (frequency) goes down. Simple and easy to observe. In astronomy, we note that the colors of stars in very distant galaxies are "wrong" as we observe them, but by "shifting the frequency" to increase it, they take on their "correct" colors. (*We know the "correct" colors due to the obvious pattern of spectral lines which the elements in a star have. The distant galaxies are moving away from us, and the light they emit is lower in frequency as we observe it than it would be if we were not moving apart. That light has been shifted toward the lower end of the optical spectrum, which is toward the red end. This is red shift, or the so-called redshift (one word) you hear about in astrophysics.Need a link for more information? Look below and you'll find some.When pitch rises as sound approackes then drops as the source passes by example: sirens
How does 3-d work?
The answer is really simple, your left eye sees one image and the right eye sees another. Since your eyes are a different distance they see a different image
What does observer mean?
It means the observer is all knowing. For example, people believe that GOD is an omniscient observer, who sees and knows everything
What does omniscent observer mean?
It means the observer is all knowing. For example, people believe that GOD is an omniscient observer, who sees and knows everything
An observer on Earth sees the phases of the Moon because?
It moves on its axis.
On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in London would see?
That person in London would see a new moon.
When an observer sees cirrus cloud followed later by cirrostratus and then altostratus he or she is witnessing the spproch of a?
warm front
What happens the apparent retrograde motion of the planet?
The planet's progress appears to slow down, or reverse its direction altogether so that it appears to move westward with respect to the stars over a period of many nights. It is important to note that this aberration of motion is an illusion - the planet in question has not changed its orbit in any way. Because of the relative motions among the observed planet and Earth, the observer on Earth sees an illusion, and from the observer's perspective, the planet appears to deviate from its normal orbit.
When an observer in Germany sees a first quarter moon an observer half way around the world and south of the equator on the same night would see?
Assuming the Moon is above the horizon, the other observer would also see a first quarter moon.
What is a natuer journal?
A nature journal - is simply a list of plants, birds insects and animals an observer sees on a country walk.
What animal does Melinda compare herself to whenever she sees An-day?
Supposing you mean the novel Speak by Laurie Halse Anderson, Melinda compares herself to a rabbit whenever she sees Andy Evans.
How are moon phases affected by the observers location?
As long as the observer is some place on the earth, his locationhas essentially no effect on the moon phase that he sees.
Can a body be regarded in a state of rest as well as in motion at the same time?
We suppose it can, according to two reports from different observers. An observer on the ground sees a passenger jet whizzing by at 400 mph, while a passenger aboard the aircraft at the same time observes it to be sufficiently motionless that she can nap or read a book.
Why do pulsars appear to flash on and off?
Because they spin. The radiation is directional and sweeps across the universe. A relatively stationary observer sees the pulsar as an off/on phenomenon.
