f = PN/120 where f is frequency of power supply, P is number of poles in the machine and N = speed in rpm. So, Synchronous speed N = 120f/P. Thus for 50 Hz supply, 2 pole machine; synchronous speed = 3000rpm. ETRICAL
Within our solar system quite a bit of exploration has been done by spacecraft including orbiters and landers. Planets outside our solar system will be difficult or impossible to explore with spacecraft in our lifetimes, so astronomers and astrobiologists use other techniques to search for signs of life on these planets. In particular, astronomers are interested in planets within the habitable zone of stars.
The Oort cloud can be considered the farthest system from out sun â¦ Although we haven't found it , there is a high probability that it exists. It is mostly made up of icey rocks. It is a system that fits in our mathematical model of the solar system and various other observations can be explained by the OORT CLOUD.