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Posted on 10/29/21 at 10:41 am to euphemus
Should be a straight line
Posted on 10/29/21 at 11:42 am to euphemus
c
different weight resistance from top of rope to bottom.
different weight resistance from top of rope to bottom.
Posted on 10/29/21 at 3:52 pm to RightHook
quote:
c
different weight resistance from top of rope to bottom.
You should watch the video that I linked in the OP to learn the right answer.
Posted on 10/29/21 at 3:54 pm to euphemus
A
*Not a physics professor. But I can lecture on the history of rope
*Not a physics professor. But I can lecture on the history of rope
This post was edited on 10/29/21 at 3:55 pm
Posted on 10/29/21 at 4:08 pm to Ted2010
I would have said C
Unfortunately I didn't have a lifeline to call my Pop, who was in the Air Cav, as he would have been more than happy to point out that the correct answer was B...seeing as how he rappelled out of Hueys more times than I can count.
Unfortunately he passed from the China virus last December, so that option wasn't available.
But he would have been more than happy to add an addenum question to the physic question posed... how much force is applied to a soldiers body if said rope breaks at the chopper and the soldier falls 70 ft plus onto a steel mat helicopter landing zone.
Unfortunately I didn't have a lifeline to call my Pop, who was in the Air Cav, as he would have been more than happy to point out that the correct answer was B...seeing as how he rappelled out of Hueys more times than I can count.
Unfortunately he passed from the China virus last December, so that option wasn't available.
But he would have been more than happy to add an addenum question to the physic question posed... how much force is applied to a soldiers body if said rope breaks at the chopper and the soldier falls 70 ft plus onto a steel mat helicopter landing zone.
Posted on 10/29/21 at 7:08 pm to euphemus
gotcha. i was debating b or c.
Posted on 10/29/21 at 7:40 pm to euphemus
I think it's C based on the three predominant forces:
The weight acting on a point in the cable in the -Z direction increases as the point gets closer to da Choppa
The wind resistance is relatively consistent, and it keeps trying to push backwards, flexing each segments relative to the last
The downforce of wind from the prop pushes the cable generally straight down.
After typing this out, it may actually be closer to the straight cable at an angle. I feel like this could lead me into a differential equation, which I'm going to choose to avoid.
The weight acting on a point in the cable in the -Z direction increases as the point gets closer to da Choppa
The wind resistance is relatively consistent, and it keeps trying to push backwards, flexing each segments relative to the last
The downforce of wind from the prop pushes the cable generally straight down.
After typing this out, it may actually be closer to the straight cable at an angle. I feel like this could lead me into a differential equation, which I'm going to choose to avoid.
Posted on 10/29/21 at 7:45 pm to euphemus
If speed is constant I would say A, but the cable is not negligible.
I would think its D.
I would think its D.
Posted on 10/29/21 at 8:36 pm to euphemus
My answer is what in the actual fuq are you asking? I am a math and science retahd but can solve s reasonably complex legal problem from time to time.
Posted on 10/29/21 at 11:13 pm to euphemus
You guys sounds like a bunch of god damn retards with your physics lingo and then getting the answer wrong.
Posted on 10/29/21 at 11:34 pm to euphemus
Haven’t looked at the video yet, here’s my guess:
If there were no drag, the rope would hang straight down (A) since the only forces acting on the rope would be gravity and the equal-but-opposite vertical tension.
If there were no gravity, the rope would be directly behind the helicopter (not an option) since the only forces acting on the rope would be the drag and the equal-but-opposite horizontal tension.
In other words, the angle of the rope at any given point is determined by the sum of the drag and gravity vectors for the remaining rope below that point. If the rope is curved, it means that the sum of those vectors is changing along the length of the rope. One would think that if the rope is “uniform,” this means that it should be a straight diagonal line (B).
You could talk yourself into overthinking it because mass is based on volume (cube) while drag is based on cross-sectional area (square) but that’s a red herring. The rope is uniform, so only one dimension changes along its length - the remaining length. Therefore both forces should decrease linearly from the top to the bottom.
Time to find out if I should have failed high school physics.
ETA: Phew.
If there were no drag, the rope would hang straight down (A) since the only forces acting on the rope would be gravity and the equal-but-opposite vertical tension.
If there were no gravity, the rope would be directly behind the helicopter (not an option) since the only forces acting on the rope would be the drag and the equal-but-opposite horizontal tension.
In other words, the angle of the rope at any given point is determined by the sum of the drag and gravity vectors for the remaining rope below that point. If the rope is curved, it means that the sum of those vectors is changing along the length of the rope. One would think that if the rope is “uniform,” this means that it should be a straight diagonal line (B).
You could talk yourself into overthinking it because mass is based on volume (cube) while drag is based on cross-sectional area (square) but that’s a red herring. The rope is uniform, so only one dimension changes along its length - the remaining length. Therefore both forces should decrease linearly from the top to the bottom.
Time to find out if I should have failed high school physics.
ETA: Phew.
This post was edited on 10/29/21 at 11:42 pm
Posted on 10/30/21 at 11:07 pm to euphemus
(no message)
This post was edited on 11/10/21 at 11:40 pm
Posted on 10/31/21 at 7:32 am to euphemus
I'm going with E, Bob.
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