Strawberries from a greenhouse

CO2 emissions from the combustion of natural gas

Heat from combustion of natural gas

Which of the following items is elementary flow?

Natural gas extracted from the subsurface

The concentration of pollutant A in a river with a total flow rate (freshwater + wastewater) of 50 m3/s is 10 mg/L. This problem occurred after a wastewater stream from an industrial facility with a flow rate of 50 L/s was sent to the river. Assuming the river had an initial concentration of 1 mg/L for the pollutant A, what is the concentration of A in the wastewater stream (g/L)?

What is the maximum power generation of a wind turbine with the blades length of 3 m, and a hub height of 90 m, in kW? The average air velocity is 3 m/s at a height of 1 m. The air density is constant and equals 1 kg/m3. 

What is the largest amount of power generated by a water turbine with 3-meter-long blades and a water velocity of 10 meters per second?

How much ($/year) is the electricity production rate of a standard fixed roof-mount PV panel that will be installed in a house in Montreal (H3G 1M8)? The size of solar panel is 4×10 m2. Assume 15% efficiency for solar to DC conversion, and 1 kW/m2 electricity generation.

The emissions are equivalent to the GHG emissions of how many passenger gasoline-powered passenger vehicles (using default parameters)?

Hyundai NEXO is a hydrogen fuel cell vehicle with a fuel consumption of 0.84 kg H2 per 100 km. Assuming that the average annual mileage in Canada is 15000 km, and hydrogen is produced by a conventional natural gas reforming process (without CCS), what are the net GHG emissions of this vehicle in one year (kg CO2 per year)?