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  1. O

    B What shape would the Earth appear to have if it were just covered by water

    So how would then it shape appear, same as that of solid surface seen now or a perfect sphere or what can be predicted about a modified shape? Regards
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    B What shape would the Earth appear to have if it were just covered by water

    Hello all, I was going through study of gravitation of earth. The book teachs that gravity of earth is more near poles than at equator as earth is not perfect sphere rather radius of earth is lesser near poles larger at equator. A thought came in my mind that if the water at level goes also...
  3. O

    B Does a rotating rigid body has single angular velocity.

    Do you mean we can't or atleast don't talk about angular velocity of body about points that do not exist on axis of rotation?
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    I Controversy about the nature of finite angular displacement

    What is "that way" I would like if you write it in more open way instead of saying"that way", I mean what will you say how we treat infinitesimal small displacement to come up with definitions of torque and angular momentum as told by you? Regards
  5. O

    B Does a rotating rigid body has single angular velocity.

    Hello all, First of all I want to mention what believe or result of concepts, do I hold about rotational motion especially about the angular velocity. I assume that unlike velocity angular velocity has to worked out from some point. I will begin with particle for this I assume that the question...
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    I Controversy about the nature of finite angular displacement

    So should I say that finite angular displacements are neither scalars nor vectors(here risk is that my students will ask in what category are they fall and questions like what is the name of that category etc fall upon me :)) ) Or should I say it is controversial matter just remember that they...
  7. O

    I Controversy about the nature of finite angular displacement

    Yeah that's where I need endorsement I mean I now agree that finite angular displacement doesn't obey commutation law I still don't feel confident in saying that, by not obeying commutation law by the finite displacements they are kept out of the category of vectors.
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    I Controversy about the nature of finite angular displacement

    Thanks both of you, very well explained. Though this has been explained very well I just need endorsement about the statement, that finite angular displacement is Scalar and infinitesimal small displacement is vector? Can I say it to my students or does this is a valid statement amongst the...
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    I Controversy about the nature of finite angular displacement

    Hello all, I am having hard time to know if the finite angular displacement really a scalar quantity? In some books they say angular displacement when finite is Scalar and when infinitesimal small is Vector, with direction perpendicular to plane of circle government by right hand rule. I...
  10. O

    B Diamagnetic material's response to temperature change

    Diamagnetic materials have their magnetic moment due to spin and there is no net dipole moment due to orbital motion of electrons. In any material having dipole moments due to orbital motion of its electron, many dipoles cling together in same orientation for reasons explained only by invoking...
  11. O

    B Can we produce magnetic field from stationary charge?

    One more thing to ask, Isn't there a way to produce time-varing electric field without moving the very charge?
  12. O

    B Can we produce magnetic field from stationary charge?

    Dear all, I know the sources of magnetic field are moving charges or varying electric field. I also know that subatomic particles(even neutron) have their own magnetic moment due to its quark and spin and their magnetic moment is explained by invoking quantum mechanics(though I don't know how...
  13. O

    B Reporting length with error limits

    Ok got it, thank you all. Regards:)
  14. O

    B Reporting length with error limits

    The questions straight as it is, are shown in two pictures below.
  15. O

    B Reporting length with error limits

    Ok thats good. Can you suggest me some(or better only one best) book(s) to me for learning more about error analysis in measurement? I have one another function( no so complex) where I need to write expression for error. Can I ask?
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    B Reporting length with error limits

    I know what is standard deviation, but what is standard error and Wolfram Mathematica things I don't know. I would like if you could take me to the target point as easy as possible but if that's not possible unless I study special statistical methods than thing is different. In that case I...
  17. O

    B Reporting length with error limits

    Can you please elaborate I am not good at these statistics so that I can figure out the differences of details of statistical deviation and systematic deviation. I really want to know it from the core. :) Regards
  18. O

    B Reporting length with error limits

    This is giving me some thought but what if the rods are made not only in the same factories but also in the same mould under same conditions. I mean isn't it possible that they are identical? Why? Can you give me an example as it will be more helpful. I am very happy to see you all helping...
  19. O

    B Reporting length with error limits

    Yeah I am thinking that, if you put 3 billion next to each other, you can measure the distance to the Moon with the same uncertainty(though I am not challenging that I am thinking correctly). I am considering that error is not linked with my calibrations(faulty calibrations or something) so it's...
  20. O

    B Reporting length with error limits

    I think I need to focus on what they are asking, when they say what is the length of two rods; and I think what they are asking is "what would you report when you place two rods end-to-end to measure it's length with the scale?" And for this I think the maximum error should still remain the...
  21. O

    B Reporting length with error limits

    Yes I want to know which is the correct way out of the two?
  22. O

    B Reporting length with error limits

    Hello all, I am in a total state of confusion with regard to this. Here is question. The length of a rod is [11.05 (+/-) 0.2]cm. What is the length of two rods? I want to know should the answer be reported like [22.1(+/-) 0.2] or [22.1(+/-) 0.4]. Regards:)
  23. O

    B Torque Equation about a point other than point of rotation

    I have no problem in using in parallel axis theorm, however what I fear is that taking torque( F* perpendicular distance) and angular acceleration about a point other than the axis of rotation, would make equation inconsistent, since(as what I am thinking) the angular acceleration of the...
  24. O

    B Torque Equation about a point other than point of rotation

    Hello all, These days I am studying rotation and rolling of bodies. We know a body can be made to rotate about any point. Let's assume that an external force is acting on the rotating body fixed about the point of rotation, and this force made the body rotates faster that is its torque produces...
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    I Surface Tension and force required to pull a thin ring

    Exactly. The problem is, the complete passage of question is not mentioning any assumption but just solved ignoring how (less)adhesive force can affect the answer. Below is the example problem with its solution: Regards
  26. O

    I Surface Tension and force required to pull a thin ring

    Hi everyone, While studying surface tension I came across a(numerical example) problem which asks to find the force required to pull a circular glass plate of some given radius from the surface of water(assume plane of plate on water surface). Value of surface tension of water is also given in...
  27. O

    A Role of accelerating voltage in Davisson Germer experiment

    I am getting what can be called "something close to explanation", a clarity could be attain if some data is employed and use maths in it to fully understand , why the peak is most conspicuous at 54V. Can this be shown? Thanks for your continuous support. Regards!
  28. O

    A Role of accelerating voltage in Davisson Germer experiment

    I looked at their paper, but some of the terms they are using are not known to me. I would be thankful to you if you help me understand the point being explained through figure 10(attaching figure below) which settles my curiosity of knowing the matter asked in the post. Regards!
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