jbriggs444's latest activity
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.What is the stroke distance? That is, what is the height difference between the piston at the bottom of a stroke and the piston at the... -
jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.Yes. I think that everyone here understands that. You want the total of: 1. The force of water pressure on the bottom surface of the...
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jbriggs444 reacted to Steve4Physics's post in the thread I've come across another fluid pressure problem I don't understand with
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Yes. Post #26 was intended for the OP - in case they didn't understand the underlying physics. My school physics teacher (from many... -
jbriggs444 reacted to Steve4Physics's post in the thread I've come across another fluid pressure problem I don't understand with Like.
You may have some misundestandings - even about the forces in Fig. 1. Try working through this: Consider the simple Fig. 1 setup...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.I do not disagree with this at all. If we are working with absolute pressures and ignoring surface tension then water pressure is always...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.For a massless piston assembly subject to no external forces other than water pressure, the calculation for ##F_3## is immediate and...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.You are seeking to design a pump? It is indeed quite challenging to design a pump that raises water without requiring power.
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.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...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.What freely falling water? I see no freely falling water. I see water constrained by cylinder walls, a piston assembly, a cylinder...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.You have not described the situation adequately. Are we to assume that the piston assembly is held in place until a preset moment when...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.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...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.If the pistons were motionless in equilibrium with some external force (as I had supposed), no water would flow. So the check valve...
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jbriggs444 reacted to haruspex's post in the thread I've come across another fluid pressure problem I don't understand with Like.
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...
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jbriggs444 replied to the thread I've come across another fluid pressure problem I don't understand.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...
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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...