jbriggs444's latest activity

There are forces other than gravity acting on it. I listed a bunch of constraints on the water. No. That is not the correct result. You...

What freely falling water? I see no freely falling water. I see water constrained by cylinder walls, a piston assembly, a cylinder...

You have not described the situation adequately. Are we to assume that the piston assembly is held in place until a preset moment when...

Did you mean to say that ##F_3## is the resultant force exerted by water on the assembly that includes both pistons? That is to say that...

If the pistons were motionless in equilibrium with some external force (as I had supposed), no water would flow. So the check valve...

I do not understand the function of the check valve here. It is drawn as though allowing flow upwards, which means admitting air if the...

I agree that the downward force (suction) from the water on the first piston (##F_1##) is 50000 N. I agree that the upward force...

Every time he himself turns by an angle x relative to the ground beneath his feet, he also turns the arrow by -x relative to himself, so...

It's a question of balance and clearly there is disagreement about that. Fortunately one person's preference doesn't decide. If I were...

@jbriggs444 many years ago, I was watching the US Open Tennis. Andy Roddick was playing Giles Muller from Luxembourg. The commentators...

We have Christmas and Easter breaks as well. It's also worth noting that the teachers holidays are shorter as they have preparation to...

You shouldn't be. All human history shows that we humans are very poor at deciding things for others. There are cases where it has to be...

It would be easy to read this as saying that unproficient students is a solved problem. That the solution is called "special education"...

For us (1960's and 70's midwest US) it was a three month vacation from June through August. My parents were both teachers, so the entire...