Because the snow suddenly gets too slushy, you decide to carry your 100-n sled the rest of the way home. how much work do you do when you pick up the sled, lifting it 0.5 m upward? how much work do you do to carry the sled if your if your house is 800 m away?

 Work  =  (weight) x (distance lifted)

           =  (100 N)  x  (0.5 m)

           =       50 joules.

If you carry the sled level all the way to your house, you're not moving it
against gravity. 

Although you're huffing and puffing and sweating by the time you reach
your house, still, according to the Physics definition of work, you have
done NO work on the sled all the way home.

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.