The seawolf class nuclear submarines have a crush depth of approximately d = 745 m. the density of seawater is ρ = 1.03×103 kg/m3. atmospheric pressure is p0 = 1.01×105 pa.
find the inward force of the water, in newtons, at crush depth on a circular porthole with a radius of r = 0.11 m.
if the interior of the submarine is kept at atmospheric pressure, what will be the magnitude of the net force on the porthole, in newtons?

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?

Which statement best describes copper? a. it has a low resistance and prevents charges from moving freely. b it has a high resistance and allows charges to move freely. c. it has a high resistance and prevents charges from moving freely. d. it has a low resistance and allows charges to move freely