Recent content by Riyuki

I'm not exactly sure what you're representing by the variable wi. Angular velocity? I think the best I can do is to say that rotational motion is always relevant because: 1) A centripetal acceleration/force is required to keep an object moving in this fashion, in contrast to straight-line...

You're right that a one-handed push would probably (perhaps necessarily, regardless of how you hold your arm, given the shape of the human body?) result in some net torque and consequent angular acceleration in the process of pushing off the wall. Which (if I understand things correctly) would...

@DaleSpam: I could be wrong, but it does seem to me that an analytical solution (as opposed to simply numerical integration) is possible with this sort of DE, without having to rely on principles of energy conservation. Of course the solution will also make sense if you look at it in terms of...

Well, it seems that it depends on what you assume is accelerating at 10m/(s^2). It could be the average acceleration of the person’s center of mass. In which case the average force exerted on the wall would indeed be 900N. And the initial acceleration of their fist would be higher than...

Yes, the acceleration is such that it tends to make the distance between the objects smaller. The analogy to a Hookean spring is correct in that regard. Though of course a Hookean spring isn’t a full analogue to gravity (unlike the Coulomb force for example, which is a total analogue)...

I don’t think that gabba was relying on the concept of potential or kinetic energy to derive his equation [ (1/2)(v^2) = -GM/r + constant ] in the last post. As you say, the problem can be analyzed solely by reference to the idea of acceleration (here including variable acceleration) and the...

Alphysicist, hanks for letting me know that the parallel-plate field is approximately uniform. I guess I can see that the angles of forces from the charges farther away on the plate will change as a test charge moves. Shooting Star, your mention of the dependence on the battery connection is...

Homework Statement I encountered the following capacitor problem on a recent test and it has brought up a couple of questions about the voltage and electric field of parallel plates. In summary my questions are: 1) How is the electric field between parallel plates quantitatively related...