You are standing on the surface of a planet that has sphericalsymmetry and a radius of 5.00 * 10^6 m. The gravitational potential energyU of the system composed of you and the planet is -1.20 * 10+9 Jif we choose U to be zero when you are very far from the planet. Whatis the magnitude of the gravity force that the planet exerts on you whenyou are standing on its surface?
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
You are standing on the surface of a planet that has spherical
symmetry and a radius of 5.00 * 10^6 m. The gravitational potential energy
U of the system composed of you and the planet is -1.20 * 10+9 J
if we choose U to be zero when you are very far from the planet. What
is the magnitude of the gravity force that the planet exerts on you when
you are standing on its surface?
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