Recent content by Android17

  1. A

    Undergrad What is the relationship between gravity and density?

    Gravity acts on the centre of gravity which is normally the centre of the core. Sun's core must be denser than Earth's core. Sun's core 150g/cm3 and Earth's core is just 12.8 g/cm3. Gravity acts as if all the mass is concentrated in the center of gravity even if the weight is distributed over...
  2. A

    High School Acceleration: Effects on Matter & Observers

    What makes objects follow the curvature of space? Can we even ask such a question?
  3. A

    High School Einstein's Gravity Model: Explaining Its Creation

    When we do the stretched rubbers he etc analogy of gravitational well, there are two differences 1) the ball moves into depression because of gravity of the earth. 2) stretched rubbersheet is physical and prevents ball from falling down while space would allow you to move anywhere as space...
  4. A

    High School The Search for a Neutron Star or Black Hole Nearby

    Why they don't need to be close? The gases would eventually start to revolve around the nucleus of the dead star, right.. Unless something else pull it away from it?
  5. A

    High School Acceleration: Effects on Matter & Observers

    Please explain what coordinate acceleration is? Earths velocity and direction changes in its orbit around the sun at various continously. So why is it not considered proper? What is the difference between proper acceleration and coordinate acceleration? If Earth was revolving around the sun at...
  6. A

    Undergrad Stellar Thermal Energy with no Nuclear source

    How? Is it the heat that causing nuclear fusion? Or the fact that gravity is smashing one nucleus into another or a combination of both? How can gravitational PE be used up? Is it because of the loss of mass as heat? How much mass would a main sequence star lose in its life time? It would be...
  7. A

    What Does Capital V Represent in Mass Balance Equations?

    Please tell me what capital V and v mean in this equation. And how can we derive the second equation from the first one.
  8. A

    High School The Search for a Neutron Star or Black Hole Nearby

    If this is true where is the core of that star, either a neutron star or a black hole should exist near by, right?
  9. A

    High School Acceleration: Effects on Matter & Observers

    1) Is acceleration relative? 2) Can an observer in an accelerating body assume that he's at rest and everything else is accelerating except him and the object he's on? 3)Earth is accelerating and decelerating in its orbit around the sun all the time and yet we don't feel it, why? Is it only...
  10. A

    High School Massive Football Field-Sized Asteroid Comes Close to Earth

    Would they even tell us if something is heading our way? I think not!
  11. A

    Undergrad Stellar Thermal Energy with no Nuclear source

    So does a star heat up when it contracts? Or Contracts when it cools down?