The drill used by most dentists today is powered by a smallair-turbine that can operate at angular speeds of 350000{\rm rpm}. These drills, along with ultrasonic dental drills, are the fastest turbines in the world-far exceeding the angularspeeds of jet engines. Suppose a drill starts at rest and comes upto operating speed in 1.9 s.
Find the angular acceleration produced by thedrill, assuming it to be constant.
α=
How many revolutions does the drill bit makeas it comes up to speed?
\Delta \theta=

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.