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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Jim Pennino Newsgroups: comp.os.linux.advocacy,sci.physics Subject: Re: A Problem To Solve :-) Date: Mon, 1 Apr 2024 10:54:17 -0700 Organization: A noiseless patient Spider Lines: 52 Message-ID: <7v8rdk-i4b41.ln1@gonzo.specsol.net> References: <17c22061208c6961$50483$3384359$802601b3@news.usenetexpress.com> Injection-Date: Mon, 01 Apr 2024 18:01:04 +0200 (CEST) Injection-Info: dont-email.me; posting-host="1c97c2c9bbcc5401121b94af724d0bb5"; logging-data="2774396"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/BxBKSBwTTGNIaKNGKOC6h" User-Agent: tin/2.6.2-20220130 ("Convalmore") (Linux/5.15.0-101-lowlatency (x86_64)) Cancel-Lock: sha1:ocwM7DzfkCa6mR2SIFTRUlE6a1s= Bytes: 3074 In sci.physics Physfitfreak wrote: > On 4/1/24 05:13, Farley Flud wrote: >> On Sun, 31 Mar 2024 19:40:02 -0500, Physfitfreak wrote: >> >>> >>> If the missile computes that 5 fighter jets at time t will exactly be at >>> these coordinates in the sky: >>> >>> Jet 1: (4.38 km, 3.9 km, 8.1 km) >>> Jet 2: (5.23 km, 9.61 km, 4.74 km) >>> Jet 3: (6.93 km, 6.01 km, 6.88 km) >>> Jet 4: (8.32 km, 2.12 km, 2.5 km) >>> Jet 5: (2.53 km, 4.23 km, 5.82 km) >>> >>> then answer the following 2 questions: >>> >>> 1- what would be the coordinates of the point in the sky, that the >>> missile with the weakest warhead needs to explode at, at time t, to >>> damage all those 5 fighter jets critically enough? >>> >>> 2- within what minimum radius of that explosion, any fighter jet would >>> get critically damaged at time t? >>> >> >> AFAIK, this is a very difficult problem.' >> >> But algorithms have recently been developed. The best one is, of >> course, implemented in FOSS: >> >> https://github.com/hbf/miniball >> >> When I get some free time I may try it out. >> >> > > > Like most other math or physics problems, one can solve it in very > difficult ways too :) Hehe :) > > Question is, can you solve it by using nothing other than at most > college algebra! No PDE's. No calculus. Just simple college algebra math. Since the intercept problem requires the solution of three dimensional differential equations, no. > > This "Miniball" is interesting though :) But heck, I solved it myself You can not solve a problem you do not understand and it is blazingly obvious to anyone that has even a little experience in solving intercept problems that you haven't a clue.