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Gaurav Seth 7 years, 1 month ago
Stars in the sky appear to be moving because of the rotation of earth on its axis. Earth moves from west to east. Therefore, it appears as if stars are rising in the west and as day dawns they set in the west.
So, stars are relatively in motion with respect to the roation of Earth.
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Sound waves are formed when a vibrating object causes the surrounding medium to vibrate. A medium is a material (solid, liquid or gas) which a wave travels through. As sound waves move through a medium the particles vibrate forwards and backwards. A sound's volume, how loud or soft it is, depends on the sound wave.
(i) Strings of sitar or veena vibrate to produce sound.
(ii) The skin of the tabla vibrate to produce sound.
(iii) The disc of the bell when beated with hammer vibrate to produce sound.
(iv) Wings of the mosquito or a bee vibrate to produce sound.
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Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named viscosity. In everyday terms, the viscosity of a fluid is described as its “thickness”.
All real fluids offer some resistance to shearing and therefore are viscous. It is helpful to use the concept of an inviscid fluid or an ideal fluid which offers no resistance to shearing and so is not viscous.
Example:If there is a wet surface between two thin glass plates, you will notice that platest get stucked and the bottom plate doesn’t fall when you hold only the top one.
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Krishna Kajolika 7 years, 1 month ago
1Thank You