Oil flows into the tank with an average velocity of 4m/s through the 50-mm diameter pipe at A. Flow out of the tank through the 20-mm diameterpipe at B is 2m/s. Determine the rate at which the depth y of the oil in the tank is changing.(Hint: W

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)