Cancer Posted February 7, 2021 Report Share Posted February 7, 2021 39 minutes ago, Bazza said: Higher than real mathematics. Did you do that knowingly or by accident? "Complex analysis" involves imaginary numbers; "Real analysis" works strictly with real numbers and leaves out the imaginary components. Quote Link to comment Share on other sites More sharing options...
Bazza Posted February 7, 2021 Report Share Posted February 7, 2021 Accidental (like quantity) Cancer 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 7, 2021 Report Share Posted February 7, 2021 4. Charges Q1 and Q2 are separated by 0.2 m, and Q1 is inside a conducting box whose nearer wall is halfway between Q1 and Q2. Q1 = +10 nC; Q2 = -20 nC. Does Q2 exert a force on Q1, and if so is it an attractive or repulsive force? A) No force Yes, and it's an attractive force C) Yes, and it's a repulsive force D) Yes, and while it's not very pretty it is rude to call it "repulsive" EDIT: stupid emoji Quote Link to comment Share on other sites More sharing options...
Pariah Posted February 7, 2021 Author Report Share Posted February 7, 2021 1 hour ago, Cancer said: 4. Charges Q1 and Q2 are separated by 0.2 m, and Q1 is inside a conducting box whose nearer wall is halfway between Q1 and Q2. Q1 = +10 nC; Q2 = -20 nC. Does Q2 exert a force on Q1, and if so is it an attractive or repulsive force? A) No force Yes, and it's an attractive force C) Yes, and it's a repulsive force D) Yes, and while it's not very pretty it is rude to call it "repulsive" EDIT: stupid emoji * writes down the question for his Honors Physics unit on electric charge in a couple of weeks * Quote Link to comment Share on other sites More sharing options...
Starlord Posted February 7, 2021 Report Share Posted February 7, 2021 Who is to say what is attractive or not attractive? Society's beauty standards are often shallow and impossible to achieve. Old Man and Lawnmower Boy 1 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 8, 2021 Report Share Posted February 8, 2021 E&M ... https://abstrusegoose.com/324 Pariah, tkdguy and Lawnmower Boy 3 Quote Link to comment Share on other sites More sharing options...
Pariah Posted February 8, 2021 Author Report Share Posted February 8, 2021 3. Annie Mercury, intrepid explorer and physics student, finds herself pulled through a vortex and into an alternate reality. This reality has a fifth fundamental force that its residents call "qlopz". The qlopz force is always repulsive, obeys the inverse square law, is measured in units called œnua (abbreviated Œ), and obeys a law something like the Universal Gravitation equation or Coulomb's Law with a proportionality constant Ð. Surprisingly, Annie discovers that the denizens of this universe measure force in newtons and length in meters. Some things never change, I suppose. During one experiment, Annie observes two objects [r] centimeters apart with qlopz values of [ql1] Œ and [ql2] Œ. Calculate the force between these two objects in terms of Ð (25Ð, ¾Ð, 2.37x10-6 Ð, etc.). Round your answer to the nearest 0.1Ð N. Quote Link to comment Share on other sites More sharing options...
Pariah Posted February 8, 2021 Author Report Share Posted February 8, 2021 On 2/6/2021 at 8:58 PM, Cancer said: 4. Charges Q1 and Q2 are separated by 0.2 m, and Q1 is inside a conducting box whose nearer wall is halfway between Q1 and Q2. Q1 = +10 nC; Q2 = -20 nC. Does Q2 exert a force on Q1, and if so is it an attractive or repulsive force? A) No force Yes, and it's an attractive force C) Yes, and it's a repulsive force D) Yes, and while it's not very pretty it is rude to call it "repulsive" EDIT: stupid emoji Q1 induces a negative charge on the face of the wall closest to it and a positive charge on the opposite side of that wall. Q2 induces a larger positive charge on the face of the wall closest to it, and a correspondingly larger negative charge on the opposite side (i.e., the side closest to Q1). End result: The conducting wall has a negative charge on the side closest to Q1, which exerts an attractive electrostatic force on Q1. The answer is B. Right...? Quote Link to comment Share on other sites More sharing options...
Starlord Posted February 8, 2021 Report Share Posted February 8, 2021 10 minutes ago, Pariah said: 3. Annie Mercury, intrepid explorer and physics student, finds herself pulled through a vortex and into an alternate reality. This reality has a fifth fundamental force that its residents call "qlopz". The qlopz force is always repulsive, obeys the inverse square law, is measured in units called œnua (abbreviated Œ), and obeys a law something like the Universal Gravitation equation or Coulomb's Law with a proportionality constant Ð. Surprisingly, Annie discovers that the denizens of this universe measure force in newtons and length in meters. Some things never change, I suppose. During one experiment, Annie observes two objects [r] centimeters apart with qlopz values of [ql1] Œ and [ql2] Œ. Calculate the force between these two objects in terms of Ð (25Ð, ¾Ð, 2.37x10-6 Ð, etc.). Round your answer to the nearest 0.1Ð N. I worked on this very hard, but gave up when I started to develop a qlopz sweat. Pariah 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 8, 2021 Report Share Posted February 8, 2021 1 hour ago, Pariah said: Q1 induces a negative charge on the face of the wall closest to it and a positive charge on the opposite side of that wall. Q2 induces a larger positive charge on the face of the wall closest to it, and a correspondingly larger negative charge on the opposite side (i.e., the side closest to Q1). End result: The conducting wall has a negative charge on the side closest to Q1, which exerts an attractive electrostatic force on Q1. The answer is B. Right...? No. Q1, outside the box, makes no field inside conductor, explicitly including Q2. It may exert a force on the box due to the induced charges on the box's outer surface, but unless there's direct mechanical coupling of Q2 to the box that force doesn't affect the free charge inside the cavity in the box. Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 8, 2021 Report Share Posted February 8, 2021 Quote Are we Living in the Matrix? No. Obviously not. It's a daft question. But, buried underneath this daft question is an extremely interesting one: is it possible to simulate the known laws of physics on a computer? Remarkably, there is a mathematical theorem, due to Nielsen and Ninomiya, that says the answer is no. I'll explain this theorem, the underlying reasons for it, and some recent work attempting to circumvent it. Colloquium announcement; the talk conflicts directly with my afternoon class, so I can't take it in. Quote Link to comment Share on other sites More sharing options...
Pariah Posted February 8, 2021 Author Report Share Posted February 8, 2021 2 hours ago, Cancer said: No. Q1, outside the box, makes no field inside conductor, explicitly including Q2. It may exert a force on the box due to the induced charges on the box's outer surface, but unless there's direct mechanical coupling of Q2 to the box that force doesn't affect the free charge inside the cavity in the box. Oh, that's one the Maxwell Laws, isn't it? Enclosed charge and all that. Got to look at that more closely. Quote Link to comment Share on other sites More sharing options...
Pariah Posted February 10, 2021 Author Report Share Posted February 10, 2021 Quote Link to comment Share on other sites More sharing options...
Bazza Posted February 10, 2021 Report Share Posted February 10, 2021 “Critical thinking makes you a conspiracy theorist” ~ paraphrased from CIA. Quote Link to comment Share on other sites More sharing options...
Old Man Posted February 10, 2021 Report Share Posted February 10, 2021 7 hours ago, Pariah said: Won't someone think of the poor conspiracy theories?! Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 11, 2021 Report Share Posted February 11, 2021 You want better conspiracy theories? Quote Link to comment Share on other sites More sharing options...
tombrown803 Posted February 11, 2021 Report Share Posted February 11, 2021 We need something to keep us entertained Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 11, 2021 Report Share Posted February 11, 2021 I concur. Now, which conspiracy is going to provide us with more green-skinned Orion slave girls? Quote Link to comment Share on other sites More sharing options...
Old Man Posted February 11, 2021 Report Share Posted February 11, 2021 Starlord, Cancer and Pariah 2 1 Quote Link to comment Share on other sites More sharing options...
Bazza Posted February 11, 2021 Report Share Posted February 11, 2021 He said maths not numbers. Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 11, 2021 Report Share Posted February 11, 2021 Ahh, but deducting 1 from 3 to get another number is math. Grailknight 1 Quote Link to comment Share on other sites More sharing options...
Bazza Posted February 11, 2021 Report Share Posted February 11, 2021 On 2/10/2021 at 5:25 PM, Old Man said: Won't someone think of the poor conspiracy theories?! The CIA does. 12 minutes ago, Cancer said: Ahh, but deducting 1 from 3 to get another number is math. Or the Grnie could just choose 2. Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 12, 2021 Report Share Posted February 12, 2021 A mathematician's lament Ternaugh 1 Quote Link to comment Share on other sites More sharing options...
Cancer Posted February 13, 2021 Report Share Posted February 13, 2021 Tune: Folsom Prison Blues I'm in a stoopidmeeting, Stoopid without end, Nothin' gettin' done here Just stoopid without end, I'm stuck in stoopidmeeting, Looming death from ennui. I hate the stoopidmeeting, Will be the death of me. rravenwood 1 Quote Link to comment Share on other sites More sharing options...
Badger Posted February 14, 2021 Report Share Posted February 14, 2021 On 2/6/2021 at 10:58 PM, Cancer said: 4. Charges Q1 and Q2 are separated by 0.2 m, and Q1 is inside a conducting box whose nearer wall is halfway between Q1 and Q2. Q1 = +10 nC; Q2 = -20 nC. Does Q2 exert a force on Q1, and if so is it an attractive or repulsive force? A) No force Yes, and it's an attractive force C) Yes, and it's a repulsive force D) Yes, and while it's not very pretty it is rude to call it "repulsive" EDIT: stupid emoji D, of course. And you should apologize to Desmond Llewellyn. Quote Link to comment Share on other sites More sharing options...
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