Recent content by Jacky817

  1. J

    What is the education system like in your country in general?

    I would like to know a bird's-eye-view of the education system in your country in general, that is from primary to tertiary or quaternary education, its criticisms and strengths. Thanks! More specifically, how well it teaches financial management skills, interpersonal & communication skills...
  2. J

    News Are patriotism and nationality still relevant in today's world?

    So sorry to have lumped everything together with no apparent links with each other. What I'm trying to say is that many forms of prejudice and discrimination (although by no means, removed) have eased, over the recent decades. So there is a trend that people are disregarding whatever...
  3. J

    News Are patriotism and nationality still relevant in today's world?

    As gender and racial discrimination become less prevalent today as compared to the past, and as globalisation brings people together both physically and in terms of communication, how significant are nationalities today? And with environmental issues becoming more and more urgent an issue...
  4. J

    Should inaction be considered as an action in any case?

    For cases like euthanasia, in some countries, the moral code is that doctors is not allowed to actively do anything to kill the patients. So they will not feed the patients who are in coma/vegetable state so as to let them starve to death, thus an inaction which is considered morally acceptable...
  5. J

    What is the fourth variable in the 4th dimension?

    If I've interpreted your question correctly, the theory would probably be Special Relativity that deals with time-dilation and space time. For applications, the GPS which makes use of satellites will need to use Eintein's equation in order for it to work accurately. (relative speed between a...
  6. J

    Circular Motion, artificial gravity

    Does it help if i were to take note that the force mg and the normal force are 2 different forces, gravitational and electromagnetic respectively? And that electromagnetic force does not simultaneously accelerate every single atom in the person's body, thus having a bit of lag (which is...
  7. J

    Understanding Orbital Motion: Comparing Satellite Weights in Different Orbits

    my bad, without the minus sign is only a convention haha
  8. J

    Understanding Orbital Motion: Comparing Satellite Weights in Different Orbits

    I don't think it is F=-(GMm)/r² there should'nt be a minus sign there. You might have confused it with gravitational potential energy? U=-(GMm)/r
  9. J

    Calculating Gravity and Orbital Speed of Mercury at Mean Distance from the Sun

    I don't find this thread constructive at all. The question is blatantly straightforward. g=GM/r² where g = gravitational strength at that point, G = gravitational constant, M = mass of the object "creating" the gravity field, the sun in this case, r = distance between the CG(center of...
  10. J

    Circular Motion, artificial gravity

    Thanks for the help but i think you've missed the point. My confusion/question is that i find that the 2 free body diagrams "looks very different", why is it that the person feels the same way---a seeming gravitational strength of 9.81N/kg. Lets say the person is on standing on the North Pole...
  11. J

    Circular Motion, artificial gravity

    My brain hangs when i try to draw a free body diagram of a person stand on Earth and then a person standing inside a "space-colony"(a large wheel that spins,at the correct angular velocity and radius, and so the person standing inside feels the same amount of force pulling him "downwards")...
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