Consider a spherical water droplet in still air falling under gravity. If the radius of the droplet is 25 microns, what is its maximum speed of fall? The density of water is pw = 1000 kg/m3 and the dynamic viscosity of air at 20 •C is 1.8 × 10^-5 kg/m •S

Q: Determine the velocity of the aircraft flying at 2500 m, when the dynamic pressure is 45N/m^2?…

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Q: Consider a spherical water droplet in still air falling under gravity. If the radius of the droplet…

A: Radius of the droplet, r=25 μm=25×10-6 m Dynamic viscosity, η=1.8×10-5 kg/m·s Density of water is…

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Q: 5 نقاط Consider a spherical water droplet in still air falling under gravity. If the radius of the…

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Q: Consider a spherical water droplet in still air falling under gravity. If the radius of the droplet…

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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.