All Questions
75
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How does the distribution of floor choices of your co-passengers affect your time of arrival in an elevator?
Note: This is a wiki post.
Suppose you are late for a meeting and you have to take an elevator. The floor choice of your fellow passengers influences how late you will reach your destination. If ...
- 12.5k
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3
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212
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Why is it that objects inside a moving train tend to move at the same speed as the train itself?
I mean I get people saying because it's Newtonian mechanics. Everything inside the train will have same speed as that of train but my question is why ? Why is it like that ? And How does that happen ?
...
- 294
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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
1
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152
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In a uniformly accelerated motion experiment, the acceleration can be attained from $V_{ave}$ vs. $t/2$ and $x$ vs. $t^2$ graph. How is this possible?
Specifically, in the experiment, we had to release a glider from an inclined plane (that had an angle of inclination of 10 degrees). We had to calculate the time it reaches the final position. We had ...
- 13
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36
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Product of two 4 positions without writing the components
I was able to solve the first part of the following question by expanding the terms as vectors
I can't understand how to do it without expanding so I had a look at the answers.
I understand how we ...
- 13
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2
answers
102
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What to do when the time interval is negative? Should its magnitude only be considered or should it be rejected?
Two bodies are dropped from the same point at different times. I am asked when they meet. The answer I get is -4 seconds. How do I interpret this?
I think that a time interval $t_2-t_1$ always has to ...
- 21
2
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3
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116
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What does the $v$ term in the proper time equation represent exactly?
I'm trying to intuitively understand proper time which is defined as the time that is always measured in a moving observer’s or particle's rest frame and is given by the equation.
$\Delta\tau = \sqrt{...
- 335
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1
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84
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Is average velocity equal to displacement per unit time OR displacement divided by time?
I had looked for the definition of average velocity in books like Resnick Halliday, Tipler ' Sears zemansky but no book writes average velocity as displacement per unit time although in these books ...
- 1,357
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1
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71
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Sine and Cosine Functions [closed]
So long story short, We were given a windmill to experiment with and a sensor could sense the Voltage produced and graph it concerning time. We decided to make a sine wave out of the positive and ...
3
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1
answer
235
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Why does it take $2d/\lvert v_1 - v_2\rvert$ time to overtake? (Can physics catch-up to math?)
The following answer is from this post.
So it becomes particularly easy to see that the opposite-direction meetings must occur at the interval $2d/(v_1 + v_2)$ and that the overtaking meetings must ...
- 177
1
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3
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86
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What is the rate of change of time wrt velocity of an object?
disclaimer, I'm just an average highschooler so please be a little friendly with the mathematics of your answers but I wondered what would be $dt/dv$?
- 33
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1
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79
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Why do my equations say that an object thrown at $30^o$ with velocity 30 m/s has a $y$ velocity of 15 m/s? [closed]
I don't know if I have stumbled upon a genuine truth, or if I'm doing something very wrong. But here is my problem:
I am modelling the 2D trajectory of an object with constant acceleration using ...
- 309
0
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1
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100
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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 ...
- 353
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2
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44
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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?
- 3
3
votes
4
answers
696
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How does the clock postulate apply in non-inertial frames?
I've read countless answers and other sources on the question of whether time dilation is caused both by velocity and acceleration or only by velocity, but they all look at things only from an ...
- 235