A container is filled to a depth of 81.5 cm with water. On top of the water floats a 21.9 cm thick layer of oil with specific gravity 0.751. What is the absolute pressure at the bottom of the container

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)