Recent content by jbriggs444

I've taken the liberty of clarifying your assertion. Yes, I agree that an expansion tank would work for that.

As drawn, the pressure inside the system is indeterminate. You have a fixed amount of fluid in a container with a fixed volume. No headroom anywhere. No pressure relief valve. In the ideal world, that would be an insolvable problem. In the real world it means that your setup will be finicky...

There is an interpretation that the net of all internal forces in a system is zero. It follows that internal forces alone cannot produce an acceleration of the center of mass of a closed system. Indeed, a modern interpretation of the third law is as a statement of momentum conservation. But I...

The chosen terms were in Latin. I believe that they were written for the capable learned men of the time: I find the explanation in the second part quite apt and symmetric. The initial phrasing is subject to misinterpretation. The second is straightforward. That is your intuition grumbling...

As I recall, your argument in this thread started out as an idea about pedagogy. That it was more helpful to accept student intuitions about cause and effect rather than to bludgeon them into submission about the fact of the matter that the third law is not at all about cause and effect. Sure...

The non slippery condition would dictate the path along which the cone rolls. It would also assure us that the motion along that path is maintained by the force of static friction.

Oh dear. The conversation has apparently shifted away from the question of gear ratios to the matter of a failure to account for the energy in a rocket exhaust stream. As a rocket goes faster and faster there is an apparent gain in efficiency. The rate at which kinetic energy is gained by a...

One does not tell the student that cause and effect do not exist. One tells the student that there is no causal relationship in the third law. One does not [always] teach in an exercise. One asks the question to test knowledge or to exercise skills. We might reasonably ask questions to probe...

Since this is your attitude, I am out. Live long and prosper.

If you have something to say, say it. Do not say that you already said it. I am not going to go back to prior posts to try to tease out some unseen meaning. If it was not clear then, it will not be clear now. Again, this is unhelpful. What does "at the bend" mean? In the scenario 3 that I am...

Which scenario are you contemplating here? I made it quite clear that I was writing about scenario 3. In this scenario there is nothing to the left of the element that is entering the inlet to the quadrant. The only source of tension in this scenario is the impulsive acceleration of the...

The power and torque lines should cross at most once (discounting the edge cases end where both torque and power are zero). The choice of units and scale will mathematically dictate the rotation rate where the crossover will be depicted. In the graph as shown, I eyeball the crossing point at...

As the graphic shown by both @PeroK and @kuruman suggests, the "field lines" in blue are perpendicular to the "equipotential surfaces" in red. For a point mass (or a spherically symmetric mass distribution), the equipotential surfaces will be concentric spherical shells and the field lines will...

The element that was returned to the top never left the system. The impulse that brought it to momentary rest was an external force. The description of the scenario requires this external force. If @haruspex wishes to think of the scenario modification as having "created" the required external...

Kingsong 18XL is rated at 2200 W and 104 Nm. One finds online that rated power and peak power differ by roughly a factor of two. One also finds that there is a constant torque regime up to a certain speed where the constant power regime kicks in. Apparently the controller will throttle up to...