Maybe the water wasnt stable enough and probably couldnt read the water level correctly
To find work, you use the equation: W = Force X Distance X Cos (0 degrees)
Following the Law of Conservation of Energy, energy cannot be destroyed nor created.
So you would do 75 N x 10m x Cos (0 degrees)= 750 J
B) atmosphere pressure, i believe
The answer is the less dense plate slides over the denser plate.
The surrounding environment cool off is the answer
