Asmall ball is attached to one end of a spring that has an unstrained length of 0.169 m. the spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.15 m/s. the spring remains nearly parallel to the ground during the motion and is observed to stretch by 0.0131 m. by how much would the spring stretch if it were attached to the ceiling and the ball allowed to hang straight down, motionless?

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.

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