# Questions tagged [distance]

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### Basic high school physics problem regarding the formula speed is the distance over time [closed]

A train 1 moves from a point $A$ in straight line at $38 km / h$ and after $2.5$ hours is followed by a train 2 which moves from the same point $A$ in straight line at $80$ km per hour. At which time ...
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### Is it possible to create computational substrates from a distance?

Processors are manufactured by photolithography, shining a light on a chemically prepared object. Layer by layer, an "active" object with computational capabilities results. Does/can a ...
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### Discretizing kinematics of moving object

I think this is a simple question, but I'm unable to find the relationship: The relative distance between two objects at any time $t$ can be written as: $x_r(t)=x_{ro}+\int_{t_0}^{t_f}v_r(t)dt$ where: ...
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### Calculating for total distance travelled vs position given $v(t)$ graph

It is currently to my understanding that the area under a $v(t)$ graph is the displacement of an object because $$\int v(t)dt = s(t).$$ However, some of the problems I have attempted recently give you ...
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### Are we seen or not by an observer from a galaxy farther away than the age of our solar system?

I looked at this question. There's one answer that alludes to what I'm asking, but I don't find it satisfactory, because to me the following is still a paradox: The most distant galaxies we have ever ...
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### How to define “work” on a movement of a celestial body? [closed]

A moving celestial body (such as a planet orbiting the Sun) creates infinite distance. How to relate this to Work formula ($W=F\cdot d$)? I know I must have wrong understanding about this formula when ...
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### Finding the distance travelled by a fly in a room from one lower corner to the diagonally opposite one [closed]

A room has a length of 4 meters, width of 5 meters and height of 3 meters. A fly is on one of the corners and walks to the diagonally opposite one. What is the length of the shortest possible traveled ...
129 views

### What is the distance from an object at which the gravitational force is exactly zero?

It is clear that the gravitational pull diminishes with increasing distance, but I can't find the answer to whether there is a point where it becomes "exactly zero". Is there such distance? Is it ...
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### What's the proper distance from the event horizon to the singularity?

How far away is the event horizon of a (Schwarzschild) black hole away from the central singularity for a radially infalling observer starting with $v=0$ somewhere outside the black hole? After ...
196 views

### Distances in general relativity

Three dimensional distance doesn't exist in general relativity because the integration of $d \vec l$ depends on the integration path. Well, maybe there is no mininum but it must be a maximum lower ...
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### Distance in seconds between moving vehicles

If two cars are moving in the same direction. let’s say ego car is in the front and another follower car. the speed, location in x, y coordinates of both cars are given. How to calculates the ...