# Questions tagged [distance]

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### Is this $x$-$t$ graph possible? Is the distance decreasing over time in this graph?

I have read in a Book: But I think it is possible as a Negative Velocity and Positive Acceleration: Reference: SL Arora Physics Class 11, Pg No. 152.
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### How to find distance between colliding objects?

Consider an object A with mass m with velocity v collides with another resting object B with mass M. After colliding we know that after some time both the objects will gain same velocity. But a ...
1 vote
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### Is it possible to determine the distance between the earth and a star by only studying the light emitted from this star?

I was reading about the Doppler shift and how we can measure how fast something is moving through its Doppler shift. This got me thinking is their a way/formula to measure the distance between us and ...
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### Calculate Speed From An Accelerometer to get meters per second

We are trying to calculate speed in meters per second from an LIS2DH accelerometer. We get ax,ay,az at regular intervals. I have read many posts about calculating the data, and taking an average over ...
188 views

### Free Fall and constant acceleration

Although the acceleration of free fall is constant, why don't the distance go like $y = 9.8+4.9= 14.7m$ after 2 seconds, $y= 19.6+14.7 = 34.3m$ after 3 seconds? I think Constant acceleration work like ...
458 views

### Finite distance, Infinite time?

Let's say that a ball dropped from $1 \ \text{m}$, covers $\frac{1}{n^2} \ \text{m}$ for every $n$ bounce, i.e $\sum_{n = 1}^{\infty} \frac {1}{n^2}$ so the total distance will be $\frac{π^2}{6}$, ...
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### How to find velocity as a function of distance/time when force is given as a function of distance?

Let's say force between two particles is given as F=k/r² where 'r' is distance between two particles and k is a constant. I am having trouble in finding velocity as a function of distance between ...
169 views

### What is the matter/energy flux on the cosmological horizons?

Consider the usual standard FLRW cosmology. Depending on the model, there may be two distinct horizons around any local comoving observer: the particles (or causality) horizon and the event horizon. ...
44 views

### How to calculate Proper Distance as an arc length in Schwarzschild metric?

I am trying to determine the method to calculate proper distance with constant time and radius in Schwarzschild Geometry. With only $\theta$ and $\phi$ being variable. I think it involves integrating ...
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### How to find time taken for a faster object to cross a slower object of same length, both moving parallel to each other in the same direction? [closed]

Can you explain me how to determine the time taken for a faster object to cross a slower object when they're both of same length and are moving parallel to each other in the same direction?
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### Is redshift an accurate method for measuring distances of distant galaxies and quasars?

I'm currently in 11th grade working on a science project about measuring distances using redshifts. I understand how the wavelength of a light wave increases when an object moves away from the point ...
1 vote
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1 vote
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### Why is position proportional to time squared?

Now I know some of the obvious answers to this, such as if you integrate the acceleration twice, you’ll get time squared, but what I’m really looking for is more of an intuitive answer. One of the ...
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### Myopia far point virtual image

My textbook says that a diverging lens works by rendering the object a virtual image at the myopic eye’s far point. However, wouldn’t the eye then perceive an object farther than its far point at the ...
1 vote
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### How does the universe preserve distance? [duplicate]

Assume I have some physical system, no matter of it's nature. Suppose also that this system can be descripted as some scalar field. So my physical object is just a function q = f(x, y, z). Imagine ...
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### Is the size of far away galaxies smaller or larger than expected?

When items are further away, they look smaller. If we know the size of something nearby, then we can calculate the size of something a known distance far away. So if there is a galaxy whose size (...
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### How do we measure the size (not mass but dimensions) of far away galaxies?

I understand how distances to galaxies are measured. I think I even understand how their mass might be measured (by their orbital trajectories?). But how can we know How big far away stars are? Like ...
351 views

### Difference between distance and norm

In special relativity, different observers measure lengths of objects differently, depending on their respective velocities. However, all observers agree on the invariant inner product of two vectors (...
58 views

### Forces distance dependent find derivatives of position time dependent

Suppose we have a force which is dependent on distance from some point. It is easy to find the acceleration based on the distance from that point, but in a previous question, I asked they told me that ...
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### Distance of the Moon Cycles

Recently, I started to search more about the orbit of the moon, and noticed there are certain periodic patterns or cycles for which I did not find any satisfactory explanation. The first cycle can be ...
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### Suppose you are told that the linear size of everything in the universe has been doubled overnight. Can you test this statement? [duplicate]

Suppose you are told that the linear size of everything in the universe has been doubled overnight. Can you test this statement by measuring sizes with a meter stick? Can you test it by the fact that ...
1 vote
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### Distances in General Relativity, near massive bodies

I've been studying the basics of General Relativity, and my question is: does it make sense to say that near a black hole (or any massive body), distances increase, the way on a topographical map the ...
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### How is position calculated when the acceleration is not constant?

To get the position of an object we can use the equation: $$x=x_0+v_0t+\frac{1}{2}at^2$$ But now I don't have a constant acceleration, both $x_0$ and $v_0$ start at $0$ and $v$ ends at $16 \text{ m/s}$...
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### How to calculate the speeds two objects need to move at in order to reach different destinations at the same time [closed]

For example: On a graph there are two points. Each point has a different destination. The distance between Point A and its destination is 50, and the distance between Point B is 100. The points will ...
401 views

### How do I determine the exact distance from Jupiter to the Sun on a specific date?

I've recently needed to determine exactly how far Jupiter was from the Sun on April 25th 2018, when a Hubble image of Jupiter was taken. I'm a beginner in physics and Google searches lead me nowhere. ...
86 views

### Variables in rectilinear motion

I wrote a post few days earlier on circular motion but it seems i still haven't got the hang of it yet. When is this equation actually true? $s=ut+\frac{1}{2}at^2$ Suppose velocity is given by $v=t-2$ ...
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### Work in different forces over the same distance [closed]

If two forces are different (Force A < Force B) but the distance over which the forces are applied is the same, then by the work formula, the object that is pushed with force B should have more ...
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### Can we observe an event that occurs more than 13.7 billion light years away? [duplicate]

In Kurzgesagt's latest video about the largest black holes, the narrator says that two black holes have been observed orbiting each other at a distance of 17 billion light years from Earth. So light ...