Answer:
I wish I could help but iam srry
This is a good question. The short (but less satisfying) answer is: "because the hydrostatic pressure of oil at a certain depth depends on the height of the oil level, measured from that point." So, you can have a tiny amount of oil but arranged in a column that makes it very tall/high and get high pressure, and have same amount of oil spread so that the height is negligible to produce a negligible amount of pressure. The exact formula for pressure is P=r*h*g (r stands for the liquid density, h for height, and g for gravitational acceleration).
The long answer, but much more satisfying, goes through the derivation of this formula. I recommend searching for a good video explaining hydrostatic pressure. (I can't post links).
Answer:
137.34 J
Explanation:
Info given:
mass1 = 2kg
height1 = 3m
mass2 = 4kg
height2 = 5m
g = 9.81m/s^2
PE = mgh
plug in info we have:
for first mass:
mgh = (2kg)(9.81m/s^2)(3m) = 58.86 J
for second mass:
mgh = (4kg)(9.81m/s^2)(5m) = 196.2 J
Difference: 196.2 J - 58.86 J = 137.34 J
