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Everything posted by J.C.MacSwell
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Well when I said object I meant a Black Hole orbited by a piece of tarpaulin. It was an "object" to us.
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Why is Moon so round and spinless?
J.C.MacSwell replied to Inquisitor's topic in Astronomy and Cosmology
Not much of a cheese shop, here at SFN. -
Cue the four Yorkshiremen from Monty Python: "U'm amazed it's cooled as much as it 'as. Thought it would be tough living with all the heat." "Never thought it would 'ave cooled enough to have evolved as far as we 'ave. Thought it would 'ave been still too bloody hot." "Didn't 'spect to even start evolving at all...yet"...Not even an amoeba would try to survive at the temperature I expected it would be." "What I meant by "living" was more like a pre-amoeba stage. I thought I might be that, perhaps living out on some trans Neptunian object. I certainly didn't 'spect to be evolving anywhere close to Earth." "I expected to be singed to death on my trans Neptunian object...'alf an 'our before I even tried to form some DNA."...
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Why is Moon so round and spinless?
J.C.MacSwell replied to Inquisitor's topic in Astronomy and Cosmology
This is a Science Forum. It has long been proven that it is made of cheese. Now given enough cheese in one place in space and it will tend toward round due to gravity. Not enough cheese and it stays in a nice tasty wedge shape. -
1. Solar radiation 2. Radioactive decay 3. Initial Heat lost at current rate Not sure if I have them in the right order for the present conditions.
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Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
inertia -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
The flow would be increasing at that point. It cannot instantaneously adjust to match any change in pressure. Force is proportional to acceleration, not velocity. -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
Isn't the period constant for an ideal pendulum? -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
That should be correct, for the tension. The flow would lag somewhat behind. But that doesn't change the fact that there is no horizontal component adding to the tension at that point in the swing. The tension is all vertical at that point.The tension at that point is greatest there because the centripetal acceleration is greatest at that point. -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
My guess (haven't worked it out either) is that the vertical component cancels out exactly, and because there is an additional horizontal component to the force, always adding to the tension except when the bucket is at the bottom of it's swing, then it would, on average, have more tension and therefore empty faster. -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
If it is proportional to the force, it would be faster for the swinging pendulum, since on average the vertical force will be the same, and there are additional components to the force in that case. -
Two water-filled buckets. One swinging. Which empties first?
J.C.MacSwell replied to Neil9327's topic in Classical Physics
Add to CP's remarks, how does the water move, or slosh, relative to the bucket? It is unlikely to be as regular or in sync with the pendulum swing, so it is quite a complex problem. If you swung it in a circle at 45 degrees it should empty faster, but that would not be the same thing. -
Lift is by definition at right angles to the overall flow (not the orientation of the blade or wing, though they are often close to the same) The direction of the flow can be relative to the turbine, or relative to the blade, in which case it would change direction from hub to tip, so there is probably a convention of taking it as relative to the turbine as a whole unless otherwise stated. Drag is in the direction of the flow, at right angles to lift. You can get a turbine to turn with drag alone, usually with the axis of rotation at right angles to the flow, almost always vertical, but they are generally less efficient. Note: if you squeeze a pea (pip) it will take off much faster than you squeezed it.
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Find the weight of a metre stick – using the law of the lever
J.C.MacSwell replied to Vivara's topic in Physics
Can you use a known weight and a fulcrum point? -
Can you provide a link to one of the more promising ones that you patented? Or did you only patent the wrong ones?
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Black hole's gravity tears objects into bits?
J.C.MacSwell replied to Baby Astronaut's topic in Relativity
If I dropped you in space and you extended (threw) a rope toward a black hole you would be "towing" it until the rope broke. Unfortunately it would be towing you as well, in the opposite direction, only faster (assuming you are not more massive than the black hole). Rope or no rope, by the time you enter the black hole and become part of it you will have displaced it from it's original path. -
Correct me if I'm wrong but light curves as it is affected by gravity and therefore undergoes constant velocity acceleration (maintains c while changing direction) So what is the smallest possible radius of that curvature?
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How would YOU build the Temple of Jupiter?
J.C.MacSwell replied to Realitycheck's topic in Engineering
But it is "Rock it" science! -
More like 500 seconds.
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Even a light touch will put it through in that case... ...so you need the speed as well. Also note that the force will not be directly in the line of travel and there will be a torque as well. Can you do an experiment?
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The moon would still throw you off course.
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What's the rush? The heat will dissipate into the rest of the kitchen eventually.
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I agree with what you are saying overall but generally it is when the wing is in stall that the lower part of the wing provides most of the lift. This is true whether the wing is inverted or not, and while a non symmetric airfoil will stall sooner when inverted there is no reason the top of the wing cannot provide the majority of the lift for inverted flight.