Consider a person weighing 2000 N sitting on a lever arm. What is the minimum mass that must be dropped from a height of 1000 meters, landing on the opposite side of the lever to launch him to the international space station (400km in altitude)? Neglect air resistance and assume all energy is transferred from the mass to the person. Remember ģ= −9.81 m/s² î is only true on the surface of earth.
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.
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