brotherbobby's latest activity
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brotherbobby replied to the thread Investigating the real roots of a cubic equation.Thank you @Ibix. I should add, to help the admin, @Greg Bernhardt, that the formatting in ##\rm{\LaTeX}## does not disappear in the main... -
brotherbobby replied to the thread Investigating the real roots of a cubic equation.Hi @pasmith, yes it seems I was mistaken too in my plotting on ##\verb|desmos.com|##. I took the constant ##k## with a positive ##(+)##...
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brotherbobby posted the thread Investigating the real roots of a cubic equation in Calculus and Beyond Homework Help.Statement of the problem : Let me copy and paste the problem as it appears in the text. [Riley, K.F., Hobson,M.P., Bence,S.J. (2006)...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.Yes sorry about that. I agree. I am sorry I don't see how that is - the earth's motion, whether towards or away, affecting when the...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.Let's have the image again. It might be obvious from the picture, but let me state it all the same. In 1 and 2, the object it moving...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.Are you saying it's the distance between 3 and 4 that matters? According to the authors, it's not the distance between 1 and 2, or...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.No, see the diagram the authors have drawn. There is no position difference between the labelled points 1 (and 2) and that between 3...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.To call it "inadequate" is putting it mildly. My calculation above (post #3) shows that if the authors had Doppler's effect in mind for...
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brotherbobby replied to the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation.I think it would be fair on my part to carry out the calculation assuming the Doppler's effect, fair to the authors of the text that is...
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brotherbobby posted the thread Undergrad Textbook description of R##\ddot{\text o}##mer's light speed calculation in Classical Physics.Statement of the problem : I copy and paste the clip from the text, underling in red the sentences where, in my opinion, the author(s)...
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Problem statement : I copy and paste the problem as it appears in the text, Conceptual Physics (12th Edition) by Hewitt, P. Two balls...
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brotherbobby reacted to Dale's post in the thread Undergrad The effect of a radio wave on an electron with
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Yes. Note that each cycle accelerates and then decelerates the electron. The acceleration portion accelerates from zero to some... -
brotherbobby replied to the thread Undergrad The effect of a radio wave on an electron.Thank you. The point may be elementary but deep. Far as I know, books don't say these things. One has to "discover" them on one's own...
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brotherbobby replied to the thread Undergrad The effect of a radio wave on an electron.Yes, forgive me, I realised my mistake just after you posted. I was thinking of editing my response. Let me do it again. The velocity...
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brotherbobby replied to the thread Undergrad The effect of a radio wave on an electron.Imagine the body to start from the origin. After 1 s, the body is at a position of ##x(1)=\dfrac{1}{2}a## with a velocity ##v(1) = a##...
