use a uniform disk 50 cm in radius turning at 300 rev/s as an energy-storage device in a bus. How much mass must the disk have it t is to be capable, while coasting to rest, of furnishing the energy equivalent of a 100-hp (75 kW) motor operating for 10 min
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.
It is proposed to use a uniform disk 50 cm in radius turning at 300 rev/s as an energy-storage device in a bus. How much mass must the disk have it t is to be capable, while coasting to rest, of furnishing the energy equivalent of a 100-hp (75 kW) motor operating for 10 min?
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