All Questions
45
questions
-1
votes
1
answer
97
views
Speed is equal to distance divided by time but is this correct?
In this study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9784821/, the distance the punch travelled from start to impact is 0.49 meters and the time taken from start of punch (that's it, they define ...
- 364
0
votes
1
answer
76
views
Given a distance, and velocity as a function of time, how do I find the time taken to travel the distance? [closed]
Given the velocity of a particle as a function of time V(t), and a distance between two points on a straight line (from point A to point B), I would like to find the time it will take the particle to ...
- 605
0
votes
0
answers
33
views
I need a ship at rest to accelerate under preferably constant acceleration/deceleration to arrive at rest at an object 55 AU away [duplicate]
I'm working on the story and I need help with the plot point. Assume that the energy needed for constant acceleration is not a problem. And there's no need to complicate this with outside forces.
I ...
-4
votes
1
answer
70
views
Can a big enough Giant travel many lightyears in just a few seconds? [closed]
We, as humans, given our height and size, view the world from the same general perspective. An ant, on the other hand, will understand the same world in a completely different way, given how limited ...
- 97
2
votes
0
answers
71
views
Number of meetings of $2$ cars starting from opposite ends of a road [closed]
Question:
$2$ cars travelling at $108,75$ kmph respectively, start from the opposite ends of a $90$ km straight road. Travelling back and forth continuously for $10$ hours, how many times do the $2$ ...
- 177
0
votes
4
answers
151
views
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.
6
votes
4
answers
742
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 $\frac{π^2}{6}$, ...
0
votes
1
answer
100
views
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 ...
- 353
0
votes
2
answers
44
views
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?
- 3
-2
votes
1
answer
249
views
Why are people using 'lightyear' as a measurement of time? [closed]
I came across 2 people in an open forum, who are college students, who that agree using the term 'lightyear' as a measurement of time is correct. Their context was "This country's technology is ...
1
vote
1
answer
145
views
Confusion with light year distance and space events
I had read that the Betelguese star may be going supernova in may of 2022. Now it is about 500 Light years away, so if we see a supernova explosion in may, then does that mean it occurred about 500 ...
- 2,042
22
votes
5
answers
3k
views
When we say 'Andromeda galaxy is 2 500 000 light years away from us' do we mean 'now' or in a far past?
When we say 'Andromeda galaxy is 2 500 000 light years away from us do we mean 'now' or in a far past and can this past be calculated easily?
- 2,255
0
votes
1
answer
150
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 ...
- 425
1
vote
2
answers
2k
views
What is distance multiplied by time?
From grade 6th we have been taught that if we find the area of the velocity-time graph is distance covered or in other words if velocity is constant then distance= velocity* time as velocity = ...
- 21
8
votes
2
answers
1k
views
If two reference frames are not moving with respect to each other, do we take into account their distance apart to determine simultaneity of events?
I'm trying to clarify the definition of simultaneity and/or relative simultaneity - for now, only with respect to two different reference frames that are not moving relative to each other.
There ...
- 391