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...
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...
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?
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...
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...
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...