# Tag Info

## Hot answers tagged angular-velocity

### Is the speed of Earth's spinning constant over a given 24 hours?

The rotation of the Earth (~73 µrad/s) does speed up and slow down by a few picoradians per second during the day because of solar/lunar tidal forces acting on the asymmetric distribution of the Earth'...
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### How can I determine the rpm of a wheel that's spinning really fast?

There's a very interesting way to find the angular velocity of a wheel that's spinning so fast that you can't measure using a stopclock. We'll be using a strobe light (a light that flashes on and off ...
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### Why are angles so weird?

Your concerns are valid, and for that reason, there is also an alternative way to view angular velocities, angular momentums, etc.: They are not vectors, but bivectors. A bivector is essentially an ...
• 2,452

### Why are angular mometum and angular velocity not necessarily parallel, but linear momentum and linear velocity are always parallel?

Note that this answer, like the tags of the question, is only focusing on Newtonian mechanics. The definition of linear momentum $\mathbf p$ is expressed in terms of the linear velocity $\mathbf v$ ...
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### How can I determine the rpm of a wheel that's spinning really fast?

I happen to have done this exact experiment over the weekend - detailed write-up below. Basically it involved a laser pointer, a photo diode, two resistors, a transistor, and an Arduino. Set the ...
• 119k
Accepted

### Non-constant angular velocity in orbit

Let's take this in two parts: first an exhibition of how this works for a trained physicist who has access to the tools of multivariate calculus, and second an examination of how you might explain ...

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