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Because of Bernoulli's principle. A moving train makes the air close(r) to the train move faster. Faster moving air has less pressure. So a paper is sucked closer to the train because of the pressure differential.
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Do all magnets attract to all metal?
no. They only attract to Nickel, Cobalt, Iron, and certain alloys.
What is pseudo force-?
AnswerIn a closed moving train, moving with uniform velocity with respect to an observer on a station, the person in the train - here after we shall denote the person by the symbol A- will not know that he is moving.A bob suspended by as string from the ceiling of the train will be vertical to the floor of the train.Suppose the train now begins to accelerate. The bob will turn through an angle θ to the vertical. Since the train is a close one, A will infer from this this change in the vertical direction that his train is accelerating. He can calculate the acceleration from the angle and hence he will apply a force equal to mass times this acceleration to all the objects in his train.This force is not the result of reaction force as far as A is concerned To apply Newton's laws of motion which is for inertial frames of reference, A applies this force to all objects in his train and thus makes his frame equivalent to an inertial frame.This force which is not as a result of action reaction force [ with respect to A] is called pseudo force.
Does red attract or repel sunlight?
All the colors seen or unseen are part of sunlight and neither attract nor repel itself.
What does all moving water have in it?
energy
What is the relationship between motion and a frame of reference?
Motion is the change in distance between two things. One of those "things" is a reference point to which the other thing is being compared. For example, in a race, my fixed point or reference point is the starting line. I move away from it toward the finish line. There is a change in distance between the starting line and me.
Can the train appear to be rest at rest while moving?
Yes and no. All motion is relative. When you say you are moving you mean in relation to something else. If are on the train and you choose something that moving alongside you at the same speed (another train for instance) then you are not moving relative to that, however you are moving in relation to the countryside. Both trains are moving in relation to a cow in the field.
What happens to sound of a train whistle as a train approaches and passes you?
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.
What happens to the sound of a train whistle as a train approaches and passes you?
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.
Why is the pitch of a train's whistle higher as the train approaches and loweras it moves away?
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.
If you watch a train go by at 20 meters per second at what speed with people sitting on the train be moving relative to you?
The people on the train are watching you go by at 20mps. It's all relative.
How do you lubricate a model train?
Use light grease around all the moving part s of the loco.
When a moving train stops kinetic energy is changes to what kind of energy?
Heat energy cause it stops and let's off all the heat it just gained from the train tracks.
Will two moving bus attract each other?
There is a force of gravity in each direction between every two objects that have mass. The forces attract the two objects toward each other. All the time. Doesn't matter what the objects are, or how far apart they are. Doesn't matter whether they're moving or still.
What happens to the sound of a train whistle as the train approaches and then passes?
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.Read more: http://wiki.answers.com/Why_is_the_pitch_of_a_train's_whistle_higher_as_the_train_approaches_and_loweras_it_moves_away#ixzz1DToTuS3j
There is a train which is moving on a straight track without any jerks or vibration. Everyone is asleep and you are awake.Doors and windows are closed. How do you know that the train is moving?
You wouldn't be able to tell. This is because you have no frame of reference to compare the motion to. You judge motion based on a point in space. If all the doors are closed, and all of the windows have shades pulled, the only points that you could compare to are ones that are moving at the same speed as you. Assuming that you feel no vibration, you couldn't tell if the train is stopped or moving. There are ways however to tell motion, just not visually. . If you have a GPS with you, you will realize that the position on the earth is changing.
When a person is sitting in a train the train is moving is the person in rest or motion?
Technically, the person is resting itself, but is in motion as long as the train is moving. ================================================== There is no 'absolute' answer. All motion is relative to the 'frame' in which it's measured. A physicist on the same train, sitting across the aisle from the person, observes the person to be at 'rest' in the physicist's frame. Another physicist, sitting in his car at a crossing, watching the train go by, observes the person to be moving past him at 50 mph. Both physicists are correct, because they're making their measurements in different 'reference frames'. By the way . . . the physicist in his car observes the physicist in the train to be moving too. At the same time, the physicist in the train is so at rest that he's preparing to take a nap. Have you ever read a book while you're in a passenger jet flying along at 400 mph ? Were you at rest or moving ? The answer is 'yes'. ============================================================== Very good point.
What if you change states in the middle of a divorce?
Tell the other party you are moving, or postpone moving until the divorce is settled. or I'm pretty sure that you can finish all of the papers via email or mail, or phone calls. Good luck~!
