Hooke's law describes a certain light spring of unstretched length 33.3 cm. when one end is attached to the top of a doorframe and a 7.31 kg object is hung from the other end, the length of the spring is 42.8 cm. (a) find its spring constant. (b) the load and the spring are taken down. two people pull in opposite directions on the ends of the spring, each with a force of 150 n. find the length of the spring in this situation.

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.

The duration of a photographic flash is related to an rc time constantly