If You Follow The Straightest Possible Path Through A Spacetime Diagram
What is spacetime. The issue is it is 2d and we have to ignore any effects of friction bc there is no friction in space.
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Spacetime can be curved just as a piece of paper can be curved.
If you follow the straightest possible path through a spacetime diagram. What is curved spacetime. The three possible geometries for spacetime are flat spherical and saddle shaped. In flat regions of spacetime freely moving objects move in straight lines.
B earth is following the straightest path possible through spacetime but this path happens to go around and around the sun. Spacetime is the four dimensional combination of space and time that forms the fabric of our universe. D earth orbits the sun because a spacetime diagram shows the sun to be a bowl shaped dip in a rubber sheet.
Notice that the surface of the earth the big solid black line is not a point but a line. Earth is following the straightest path possible through spacetime but this path happens to go around and around the sun. C earth orbits the sun because earth and sun are connected by a rope like set of invisible subatomic particles.
Time is different for different observers spacetime is the same for everyone from sci 238 at university of waterloo. We use it to represent spacetime. D earth orbits the sun because a spacetime diagram shows the sun to be a bowl shaped dip in a rubber sheet.
Earth is following the straightest path possible through spacetime but this path happens to go around and around the sun. This is the worldline of the surface of the earth. Your worldline is following the straightest possible path through spacetime.
The mass of the sun causes spacetime to curve so freely moving objects such as planets and comets follow the straightest possible paths allowed by the curvature of spacetime. B earth is following the straightest path possible through spacetime but this path happens to go around and around the sun. The lines parallel to the red arrow are lines of constant time and the lines parallel to the blue arrow are lines of constant distance from the earth.
If you feel weight then you are not on the straightest possible path. Circles that were evenly spaced in flat spacetime become more widely spaced near the central mass. C earth orbits the sun because earth and sun are connected by a rope like set of invisible subatomic particles.
If you follow the straightest possible path through a spacetime diagram you must be traveling at the speed of light you get from one place to another as fast as possible you are in free fall you do not feel any weight or acceleration none of the above if you follow the straightest possible path through a spacetime diagram.
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