# Questions tagged [velocity]

The time rate of change of the position of an object

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### Buoyancy - Droplet of Oil in Water

If I place a droplet of oil, which is less dense than water, at the bottom of a glass of water, it should start to rise in the water due to the buoyant force. Will the oil droplet start rising faster ...
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### Does “$\rm m/s$” mean the same thing when used for instantaneous velocity and for mean velocity?

The following question on Philosophy SE https://philosophy.stackexchange.com/q/73366/ relies on this "given" "suppose that the instantaneous velocity of object A is $1$m/s and that the mean ...
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### Speaker on bicycle - would it propel the rider forward?

You strap a super powerful speaker on your back, blast it on max volume. Would it propel you forward?
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### External force dependent on velocity on a Lagrangian [duplicate]

The question I have is, what conditions must satisfy an external force dependent on velocity so it can be a part of the lagrangian and Euler-Lagrange equations are still true.
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### Does tangential acceleration change with radius? [closed]

Do tangential velocity and tangential acceleration change with radius (change of radius on the same object)? For example consider a spinning disk. Does the equation $$a_t = \alpha R$$ (where $a_t$ ...
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### Is the initial horizontal velocity of a kicked ball also it's maximum horizontal velocity? [closed]

The horizontal velocity that the ball acquires from the impact of your foot, will this be the maximum velocity, or will there be some horizontal acceleration at first, after which drag will slow down ...
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### Acceleration as a function of position and time

I know if you have an acceleration as a function of $t$, $a(t)$, to find the velocity you simply integrate $a(t)$ with respect to $t$. Moreover, if the acceleration was a function of position, $a(x)$, ...
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### Electron's velocity speed and angle with time [closed]

An electron follows a helical path in a uniform magnetic field, does its velocity, speed and angle changing with time?
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### Why does speed affect turn radius when turning a motorcycle given a fixed lean angle?

I have been looking at a formula which is supposed to calculate the lean angle and turn radius which is $$\theta=\arctan\left(\frac{v^2}{gr}\right)$$ I do not understand how velocity effects turning ...
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### Non-inertial uniform velocity frame

Suppose, an observer is on a train which has only platform to stand but no walls. The train is moving with a constant velocity with reference to railroad. While moving, the observer feels strong wind ...
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### In the equation: $a = dv/dt$ , is $dt$ the time taken to achieve that instantaneous acceleration?

If you solve for $dt$ from $a = \frac{dv}{dt}$ , is it the time taken to to achieved that instantaneous acceleration? $a$ : acceleration $v$ : velocity $t$ : time
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### Dynamic Bend Angle During Explosion Bonding Process (Simple Vector Problem)

For some reason this makes no sense to me. The setup is pictured: A flyer plate at a fixed distance from a base plate has explosive placed on top and is accelerated into the base. $V_D$ and $V_C$ are ...
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### What does the first derivative of (2-norm) distance with respect to time tell us?

My basic physics' knowledge is a little rusty. My apologies in advance. I know that the first derivative of position or displacement with respect to time is the instantaneous velocity. Suppose I have ...
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### The relation between rebound angle and angular frequency of dropped spinning ball?

The dropped ball is spinning around a horizontal axis and bounces away from the vertical at an angle. I tried solving this problem using the angular and linear momentums with the following logic: ...
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### Why don't these conversions of time between reference frames seem consistent? [closed]

I am a student and due to school closures I am reading ahead in physics. I have been learning about relativity and I made up a problem for myself. You can see a diagram that I drew below: The diagram ...
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### Velocity of particle due to acceleration. Special relativity

I understand how to do transformations of four velocities, acceleration and so on under Lorentz boosts. However after all I have learned in special relativity I still don't know how just an ordinary ...