# Questions tagged [speed]

Scalar quantity which is the magnitude of velocity.

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### How to accumulate torque of multiple independent gears? [closed]

If I have 3 gears meshed with a gear in the center of the 3 gears as shown in the picture. all of those 3 gears are connected to different power sources. They are free to rotate in the same direction ...
39 views

### If traveling with relativistic speeds can observer find space denser than normal?

I know that outer space contains few particles per cubic meter, but I am curious if travelling that fast for our brave traveller all of these particles will look like a dense pool of molecules. And ...
46 views

### Straight Motion Kinematics Equation [closed]

Please explain to me, for the interval $15\leq t\leq 20$, why $x(t)=x(15)+8t=x(0)−160+8t$ with $v(t)=+8$, and the positive sign (+) indicates the direction to the right.
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### Is mass relative? [duplicate]

Since time is relative to the observer's velocity, does that mean that velocities are also relative, since the same distance is covered in a different time, depending on your reference frame? If ...
34 views

### 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 ...
36 views

### Velocity while falling from table

Suppose there is a chain of mass $m$ in a semicircular tube of radius $r$. If it's pushed, then find the velocity of the chain while leaving the tube. This is a simple problem which we can do using ...
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### How can mean free path affect the propagation of sound in a gas?

I was thinking, since mean free path is a measure of "how long" a particle has to travel to collide with another, that this surely must influence sound propagation somehow. I would say this ...
1k views

### Can relativistic mass actually change gravitational pull?

I've heard that relativistic mass can influence gravity, but this seems to create a paradox, unless I am missing something. It seems to me that if there were two celestial bodies that are observed to ...
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### Visualisation tool for different speeds? [duplicate]

I'm a student often doing kinematics word problems with objects moving at X km/h, Y m/s, or Z cm/s. Yet, I have no idea what these units look like in real life. Out of curiosity, I'm searching for a ...
110 views

### Conversion between pressure in PSI and velocity [duplicate]

My question is about whether you can convert the pressure something has to the velocity it will have. For example, if I had water shooting out of a hose at 100PSI, could I calculate the speed that the ...
I was going through my book when I came across this statement which was stated as a fact. 'That the minimum distance between two particles always having the same speed is $\frac{\lambda}{2}$ where \$\...