All Questions
Tagged with relative-motion kinematics
171
questions
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How do we know if a particle is moving or not? [duplicate]
if there is only one particle in the universe, how do we know if it is moving or not?
We don't have any other object to track the distance between the two, then is it possible to determine the ...
- 103
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votes
1
answer
111
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Distance between two airplanes [closed]
I need help with a vector problem where my solution is different from that of my teacher. The translation of the problem reads as follows:
An air traffic controller observes two aircraft on his radar ...
4
votes
1
answer
151
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Relative Circular Motion [duplicate]
Four particles $P_1, P_2,P_3,P_4$ are moving in a plane. At $t=0$, they are at the four corners of a square $ABCD$ of edge length $l$. Each of the particles has a constant speed $v$. The velocity of $...
- 345
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1
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CoM-and-relative velocity
In our scrip we are considering the elastic collision between two particles, one with inital velocity $\vec v$ and the other $\vec w$. We also consider that the particles have the same mass.
...
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3
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2
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278
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Can we use relative motion if acceleration of two bodies are different?
Suppose, on the $x$-axis, a body $A$ is moving with velocity $v_1$ and acceleration $a_1$, and a second body $B$ is moving with velocity $v_2$ and acceleration $a_2$. $B$ is at a distance of $S$ from $...
3
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2
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Relative Velocity (Kinematics) [closed]
I was studying the concept of relative velocity and after solving a few problems I am running into this confusion.
a) Let’s say two cars are moving perpendicular to each other (no collision) with ...
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2
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3
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675
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I am moving right and rain is falling vertically down.Why should I hold umbrella at an angle?
This is related to relative velocity.I get that, from my moving frame of reference rain is making an angle.But still... it doesn't make sense to hold umbrella at an angle when rain is falling ...
1
vote
1
answer
124
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Velocity of an object with respect to the same object
I know that velocity of an object with respect to the same object is a null vector but I'm not able to get a grasp of it.
Whatever I had thought till now is that if I'm sitting in a train (which may ...
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What will be the minimum drift possible when a boat crosses a river? [closed]
Imagine a boat with a constant speed $v$ that has to cross a river of width $d$. Let the river flow with a constant velocity $u$. I want to know the angle at which the boat should sail in order to ...
0
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1
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35
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Using rate and per unit time together for describing effects of motion
I have observed recently 3 different elementary definitions of velocity
Rate of change of position, change in position per unit time ,and
rate of change in position with respect to time,so I am not ...
1
vote
2
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428
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Apparent wavelength received by observer in doppler's effect
I have a few doubts about Doppler's effect.
Does the apparent wavelength received by the observer depend upon whether the observer is moving or not?
$λ_{apparent}=\ \frac{v_{sound}\pm v_{source}}{f}$....
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On a rainy day, a man is running on a hilly terrain in such a way that he is always finding the rain drops hitting him vertically
It is assumed that rainfall is uniform in the whole terrain from O to E(figure attached) When the man was at rest on stretch OA, he found the rainfall at an angle of $30^o $ with the vertical.
What ...
- 309
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1
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278
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Relative position from two reference frames
Here, clearly $\vec{r}_{S'S} + \vec{r}_{PS'}= \vec{r}_{PS}$. Then we differentiate and double differentiate and get the standard equations of relative velocity and acceleration.
Now according to my ...
- 45
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Why do we say the resultant vector as the relative motion in this case?
If a car A moves with acceleration $2m/s^2 $due east and car B moves $1m/s^2 $due north. What would be the acceleration of car B with respect to car A. Now , for this. The solution in my textbook is ...
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131
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Can I apply Newton's equations of motion to relative motion?
We know that
Velocity of A relative to B is
$$ \vec v_{A|B} = \vec v_A - \vec v_B $$
and Acceleration of A relative to B is
$$ \vec a_{A|B} = \vec a_A - \vec a_B $$
So, is it correct to do this to ...
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