300 gallons per minute
question cannot be answered because it depends on the water pressure
As much as you want. But a larger quantity will take longer to pass through the hose.
Depends on what's flowing (gas or water or something else) and under how much pressure.
4324
5 Pounds per Square Inch
More, depending on how long you allow the flow to flow.
Depending on the time allowed, all the water you want.
Channel flow is how much water flows through a channel.
Given enough time the entire ocean could be pumped through a half-inch pipe.
A lot
That depends on the pressure behind the flow, and on the length of time the flow is allowed to continue.
10ppm of copper what mass of this rock must water flow. 10/10^6=2000/x=2E8 kg