♦ Scientific Reasoning : What would happen if Earth stops spinning ? ♦
Ans : If the Earth stopped spinning, it would then take 365 days for the Sun to move through the sky and return to the same position. Half of the Earth would be baked for half a year, while the other hemisphere was in darkness. It would get very hot on the sunny side, and very cold in the shadowed side. You can imagine how that would be devastating to plants and animals. We get a hint of this at the poles, where you can experience weeks of permanent night and then weeks of permanent day. But imagine 6 months of night, followed by 6 months of day.
♦ Scientific Reasoning : Why does Earth rotates about its own axis ?♦
Ans : Earth has magnetic field with North & South Poles. The axis of rotation is different from the magnetic poles. This difference creates force for the earth to rotate on its axis. The same is the case with all planets in the Solar System. Moon doesn’t have Magnetic field; hence it does not rotate on its axis.
♦ Scientific Reasoning : Why it is safer to sit inside a car during a Thunderstorm ? ♦
Ans : It is safer to be inside a car during thunderstorm because the car acts like a Faraday cage . The metal in the car will shield you from any external electric field and thus prevent the lighting from travelling within the car .
♦ Scientific Reasoning : Why it is necessary to use satellite for long distance TV transmission ? ♦
Ans: Yes , TV signals being of high frequency are not reflected by the ionosphere . Therefore , to reflect these signals , satellites are needed . That is why , satellites are used for long distance TV transmission .
♦ Scientific Reasoning : Why does moving part of a moving coil galvanometer comes to rest almost instantaneously ? ♦
Ans: Moving part of a moving coil galvanometer comes to rest almost instantaneously Due to electromagnetic damping , that is production of induced current in the frame and the coil which strongly opposes motion according to Lenz’s Law .