jbriggs444's latest activity
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There is no perimeter. As far as we are aware the universe is either infinite in size or closed and boundaryless (like the surface of a... -
jbriggs444 replied to the thread I Where did the early photons go?.We start by laying down a "co-moving" coordinate system. In this coordinate system the universe at a particular time is homogeneous. We...
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jbriggs444 replied to the thread I Where did the early photons go?.Density, for one thing.
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jbriggs444 replied to the thread I Where did the early photons go?.According to our accepted theories there is no edge. Just more approximately homogeneous universe in every direction. The "diameter of...
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https://en.wikipedia.org/wiki/Statically_indeterminate
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jbriggs444 replied to the thread Correct statement about siphon used to empty water tank.At room temperature the saturated vapor pressure of water is about 3% of an atmosphere. Whether this counts as "approximately zero"...
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jbriggs444 replied to the thread B The Effect of Linear and Rotational Motion on Measured Weight.On the contrary, I would expect an effect for all circle sizes. The effect would gradually increase as the diameter of the circle...
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jbriggs444 replied to the thread Correct statement about siphon used to empty water tank.[Water] siphons stop working at about 0 C.
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jbriggs444 replied to the thread Correct statement about a reservoir with an outlet pipe.Which would mean that no water is exiting at the bottom.
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jbriggs444 replied to the thread Correct statement about a reservoir with an outlet pipe.If the water level is constant then the surface water is motionless. If it is supposed to be raining, then one needs to say so. The...
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jbriggs444 reacted to Chestermiller's post in the thread Correct statement about siphon used to empty water tank with
Like.
At the maximum hight of the siphon, when cavitation occurs, the absolute pressure is not zero, It is equal to the vapor pressure of the... -
I wrote my PhD dissertation in the early 1980s using the TECO text editor and RUNOFF page formatter on my department's VAX 11/780, on...
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jbriggs444 reacted to PeroK's post in the thread B How to derive the 4 laws of motion using Calculus? with Like.
You can't. The laws of motion are physical laws, independent of the foundations of mathematics. The laws can be stated in mathematical...
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jbriggs444 replied to the thread Correct statement about siphon used to empty water tank.I dislike this question. It is full of ambiguities. It appears that by "at maximum height" they mean the maximum height to which the...
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