Awater balloon weighing 19.6 n rests on a table. the balloon has an area of 0.015 m^2 in contact with the table. what pressure does the balloon exert on the table?

We need to go back to the definition of pressure. It is the ratio of Force applied (normal to a surface) over that surface. Hence, we have that F=p*A or . The  normal force on the table is equalt to the weight of the ballon since gravitational forces from the Earth have downwards direction.
Substituting the known values, we get that p=1306.67 P= 1306.67 . That is regarding the measure of P. The direction of the pressure is always the same as that of the force, in this case downwards (towards the center of the Earth).

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.

Ibelieve the answer is b