# Questions tagged [acceleration]

The rate of change of velocity of a body per unit of time.

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### Can the question of a gravitationally accelerated charge radiation be tested experimentally?

I know that the question of radiation from a gravitationally accelerated charge has been discussed extensively at Does a charged particle accelerating in a gravitational field radiate?. Yet the ...
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### Is acceleration continuous?

The extrapolation of this Phys.SE post. It's obvious to me that velocity can't be discontinuous, as nothing can have infinite acceleration. And it seems pretty likely that acceleration can't be ...
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### Are Maxwell's equations valid in a rotating frame?

Maxwell's equations are covariant under Lorentz transformations. Are they covariant under going to a rotating frame and if not how do they look?
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### Can anyone explain me how do I calculate torque?

For my gate automation project, I estimated the amount of force required (in order to estimate the torque) to pull my gate with a spring balance. The display on the spring balance read $2 \text{ kg}$. ...
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### Energy consumption from acceleration

I have an interesting problem. I have a machine which has to lift 35 kg (this is the total mass of the object and the lifting arm). The lifting is done by a servo motor. Now I want to calculate the ...
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### Acceleration from scalar-matter coupling in classical field theory

I have came across a text where an interaction term in a classical Lagrangian is presented that couples a matter density $\rho$ and a scalar field $\phi$ as \begin{equation} \mathcal{L}_{\text{int}} =...
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### The flyby anomaly, rotation, and gyroscopes: help understanding the theoretical connection

The flyby effect in spaceflight is described in the question Is the Flyby Anomaly still a thing? It is an very small unexplained acceleration seen in some spacecraft trajectories during flyby ...
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### Force of impact the same regardless of which object is moving?

My friend is trying to tell me the force of an impact of riding a bicycle into a stationary car at a speed $v$ will be the same force as if the car is traveling at the same speed $v$ and drives into a ...
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### Calculating an acceleration from 3 axis MEMS

I installed a MEMD sensor on a motor that I can control the motor speed. I'm recording the information from the sensor (x, y, z) I'm trying to compare if the MEMS sensor reading is ad the same as my ...
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### Relative acceleration

If the accelerations of two objects are such their one of their components are directed opposite to each other , while the other components are directed in the same direction , then why is relative ...
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### Infinite current carrying wire, moving parallel to it's current flow direction?

At $t=0$ current flows in an infinite wire, and creates a magnetic field, after sometime the infinite wire begins to accelerate(only the wire wile $I$ remains constant), in a direction parallel to the ...
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### Determining the mass of my car via m = F/a

I'd like to do something unconventional. I'd like to weigh my car by hitting the gas. I have an accelerometer in my phone (a). I'm trying to determine the force the car is exerting (against the road, ...
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### Avoiding inertial affects by accelerating larger mass in 2 body system

Suppose two bodies S and L are in proximity (asteroids say). L is substantially larger than S. For simplicity, let them initially have negligible angular and linear velocity. S will begin to fall ...
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### Gravitation Acceleration in General of Kerr-Newman Black Hole

The surface gravity (acceleration at event horizon, as measured by an observer at infinity, since the proper acceleration is infinite) of a Kerr-Newman black hole is given (e.g. here) as: \kappa ...
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### Misconception regarding Wedge constraints motion

The block of mass $m$ slides on a wedge of mass $m$ which is free to move on the horizontal ground. Find the acceleration of wedge and block. Sol. Let $a$ acc. of wedge and $b$ acc. of block w.r.t. ...