Why are satellites always launched from the east coast?

Earth rotates from west to east causing the Sun, the Moon, stars andother planets rise frommy science school satellite



east and set in the west. On the surface of the eartheach point is moving eastward with



respect to an astronaut in space.



Thus if a rocket is launched at a small angle eastward vertically the speed of earth gets added to



the rocket's speed. This reduces the amount of fuelrequired. If the rocket is inclined along any



other direction, the speed of the earth gets subtracted from the speed of rocket and will



necessitate burning of more fuel.



In addition, in case of any failure during launch the rocket will fall back to the earth.



Hence if it is launched from the east coast, the rocket will fall into the sea only. If it is launched from the west coast, in case of failure, the rocket will fall on the land endangering human habitats. Thus choosing eastward inclination is scientific but choice of eastern coast concerns safety.


How does a cell phone work?

In normal telephone exchange systems, a pair of wires extends each telephone instrument to the telephone exchange.



Normally, copper conductors are used to give loop to indicate the exchange that the 


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telephone handset had been lifted for making a call or for receiving a call. In advanced countries, Optical Fibre is also used for extending the loop.




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