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.
Neptune's placement, Inner Planet or Outer Planet. Neptune is the 8th planet from the sun. Jupiter, Saturn, Uranus, and Neptune are outer planets. The outer planets are also called the Jovian planets or gas planets.The outer planets are much larger than the inner planets that they make up 99 percent of the mass that orbits the sun.upiter, Saturn, Uranus, and Neptune are outer planets. The outer planets are also called the Jovian planets or gas planets.