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Artificial satellites
1. Satellites help to develop reliable communication links between different countries separated by large distances on the globe. The communications include telephone conversations, fax messages and contact through a INTERNET. Such satellites are called ‘communication satellites'.
2. Many artificial satellites are helping to follow weather changes. With the advance information sent by a satellite about cyclones, typhoons, etc., can be avoided. Such satellites are used for the purpose of ‘weather prediction'.
3. Some satellites can see the areas of forests, deserts on the land and also areas on the ocean and take pictures. With the help of these pictures proper steps are taken to prevent deforestation and expansion of deserts.Collection of large number of fish in certain area of an ocean can be detected by a satellite. This would enable fishermen to catch the fish. Presence of minerals, ores and ground water in a region of the land in a country could be detected from the pictures sent by satellites. Such satellites are called ‘remote-sensing satellites'.
4. Satellites and space-stations are used for exploring planets, stars and galaxies in the universe. Space-shuttles sent by America also behave as a satellites. Experiments conducted in such space-shuttles and space-station promoted the growth of science and technology in the modern world. Satellites have also been used for spying by defence services of country.
The water supply of a building is fed by a main pipe 6.00cm in diameter. A 2.00cm diameter tap is located 2.00m above the main pipe. When the tap is turned on it fills a 25.0L cont
Gold: Atomic number 79 Symbol Au Atomic weight 196.9665 discov
A charge is said to be in equilibrium, if total force performing on it is zero. A operation of charges is said to be in equilibrium if every charge is independently is equilibrium.
Semi conductors: Semi conductors are these substances which lie among conductor and insulators. Semi conductor is those substances which hardly pass electric current by them
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INTRODUCTION: Superconductivity is a phenomenon takes place in certain materials at low temperatures. Characterized by precisely zero electrical resistance. Superconductors have
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Q. How greatly does sea salt weigh per cubic foot? Answer:- Sodium chloride NaCl weighs 72 lb/ft 3 .
The density of gasoline at 0 degrees C is 0.68 x103 kg/m3 What is the density on a hot day when the temperature is41 degrees C? What is the percentage change (+/-)?
The magnetic field of Earth resembles the field of a bar magnet. The north pole of a compass needle, used for navigation, generally points toward the geographic north pole.
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