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| Deceleration's 100 math problems thread!; Absolute torture... | |
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| Tweet Topic Started: Aug 4 2011, 04:22 AM (5,611 Views) | |
| Brayzure | May 1 2012, 10:15 AM Post #171 |
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The Analytic Commander
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I was going to post yesterday, but forgot. Anyways, I discovered a fatal error in my calculations. See, I had converted the initial velocity to km, but left the initial height and acceleration due to gravity in m. I fixed it, and one history class later, I have a new, much larger, answer. 371.5527225 km. |
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| Deceleration | May 1 2012, 09:50 PM Post #172 |
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Coreling Conquerer
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I got something pretty similar with no conversions. I prefer to work in meters, they are the common length that relate to other forms of measurement. Here's how I did it. I broke 2,000 meters per second into two vectors. The first is the vertical vector, at precisely 1,000 meters per second. The second is the horizontal vector at 1,732.05 meters per second. Using an equation of motion, I found that a projectile with an initial vertical velocity of 1,000 meters per second will fall 15 meters from its starting position in 204.096 seconds. After that, it was a simple matter to multiply this time by the initial horizontal velocity to obtain a distance of 353,505.3 meters or 353.5053 kilometers. I didn't bother to factor in the curvature of the Earth, but it should increase the distance by about 200 meters or so. |
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| Brayzure | May 1 2012, 10:25 PM Post #173 |
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The Analytic Commander
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So it seems we got similar answers. Maybe I could send it to my Pre-calc teacher for verification... |
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| Deceleration | May 2 2012, 12:51 AM Post #174 |
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Coreling Conquerer
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You know, the US Navy fired a railgun shot at Mach 7 or 2,382.03 m/s recently, I think. It may have been a few years ago. The shot burned up due to friction in the atmosphere rather quickly, meaning that the projectile in my question wouldn't have hit anything. |
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| Spar | May 2 2012, 03:44 AM Post #175 |
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Wandering Scavenger
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Quite a number of years ago. Nearly capsized the ship they fired it from while they were at it. |
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| Brayzure | May 2 2012, 10:10 AM Post #176 |
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The Analytic Commander
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What material did they use in the slug? Surely they could get it to last longer. |
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| Spar | May 2 2012, 12:27 PM Post #177 |
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Wandering Scavenger
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It was a solid steel projectile. I forget how heavy it was, but it was something like five tons or so. It was a test shot and they didn't want to use a more expensive material. The US Army did a test with railguns as well and shot one of their tanks (without informing the tank crew while the tank was on a mission). It punched a hole clean through the tank and killed the occupants with the concussive force. They covered it up by putting a bomb under it and claiming the tank was destroyed with an IED, but foreign press images clearly showed that the tank's cockpit was fine (thus the crew would've survived), apart from the hole through the tank. The US military was most displeased with the presses images and hacked several press websites to remove the images (including the images taken of where the railgun was set up and dismantled) and documentation. |
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| nedben | May 2 2012, 07:39 PM Post #178 |
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Eternal Commander
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As stated (apparently somewhere background) before, Spar has impeccable timing when it comes to reading the news. |
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| Spar | May 3 2012, 01:11 AM Post #179 |
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Wandering Scavenger
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I like having accurate knowledge of what's going on in the world. However that requires that I get almost all my news from outside the US. |
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| Brayzure | May 3 2012, 10:11 AM Post #180 |
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The Analytic Commander
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What are your sources? I like the sound of them! |
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