# Questions tagged [relative-motion]

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### Wind and sound waves [closed]

The official answer is C. Why not A? If I add a horizontal component of velocity towards left, why would the path become curved?
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### Why can't any object gain the speed of light? [duplicate]

Suppose a object A is moving towards left with 200,000 km/s and objects B moving with 200,000km/s towards right. According to this above Statement, this could be happened because Speed of objects is ...
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### Velocity of one particle w.r.t. another

Let us say that two particles $p_1$ and $p_2$ are moving in an inertial frame fixed to some point on earth. Call this frame as world frame. The velocity of $p_1$ is $(v_{1x}, v_{1y})$ in $x-y$ ...
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### What angle does a projectile have to be shot on a rotating disk in order to pass through the center?

Let us consider the following setup: We have a rotating disk of radius $r$ and with angular velocity $\omega$. At the periphery of the disk, we have a projectile with some mass that's sent with a ...
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### Can't understand a statement about motion

From the book where I am studying motion, It says Motion is a combined property of the object under study and the observer. There is no meaning of rest or motion without the viewer. I know that, for ...
1 vote
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### A problem Understanding how a two-body system of planets starts rotating around barycentre

Consider,We are Creating a Two-body system in free space,Where no other mass exists,Let's Take First Mass M1 and hold it,Now bring Second Mass M2,hold it up,Now we are giving a suddenly impulse To M1 ...
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### Minimum seperation of moving objects doubt

Let there be $2$ objects $P_1$(initial velocity $u$ $ms^{-1}$ & acceleration $a$ $ms^{-2}$) & $P_2$ (initial velocity $U$ $ms^{-1}$ & acceleration $A$ $ms^{-2}$) initially separated by ...
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### How can I calculate the relative velocity on the surface of a planet that is both rotating and orbiting a star? [closed]

So here is the problem that I'm dealing with: I thought that I could just subtract the 10000 m/s from the 30000 m/s since they're spinning opposite of each other but that didn't end up giving me the ...
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### Angular velocity of a particle in uniform circular motion about a general point

This problem was given by our professor. Consider a particle P executing uniform circular motion wrt the point O with uniform angular velocity $\omega$ anticlockwise whose cordinate is $(2R,0)$ in a ...
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### Is there a bug in this step (and how to fix it?)

Reading an old book of classical mechanics (Spiegel's theoretical mechanics) I came across a passage that I would like to clarify. In order to find the equations of motion of free falling point ...
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### Why is the speed of near speed of light moving particles not over the speed of light?

I've been looking for an answer to this question for a while now and I've seen the mathematical explanation $$Vr=[V1+V2]/[1+V1*V2/c²]$$ I understand that the result cannot be greater than $c$ because ...
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### How is a change in KE the same in every inertial reference frame?

This is not about special relativity, so assume speeds are much less than $c$. This article says a change in kinetic energy (KE) remains constant in all inertial reference frames. So the kinetic ...
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### Can a bubble of vacuum move through space?

If there are really regions in space where a vacuum exists, I have learned there can still exist electric and magnetic fields within. That makes this region then differentiable from the regions around ...
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