1. A semi truck has two fuel tanks, each holding 120 gallons of diesel fuel. (a) How many barrels of crude oil are required to completely fill the tanks if there are 42 gallons in one barrel?(Use the conversion and refining numbers from the slides: Crude oil 45 MJ/kg). (b) How much energy is contained in that much fuel, if there are 9.7kWh in one liter of fuel? – 21.8 barrels, 8812 kWh

2. What would be the rate of CO2 emissions in a power plant that is a gas-fired facility that is 44% efficient? It produces energy at the rate of 1GW. (Burning gas emits CO2 emissions of 50kg per GJ) – 113.6kg per second

3. A coal-burning power plant has an efficiency of 33%. If every day the power plant exhausts 9 1013J of heat per day, how much useful work will the plant produce in a day? – 4.431013J

4. What is the energy content of the world’s gas reserve, in joules? We have 7 quadrillion cubic feet of gas, and gas has 1000 Btu/ft3. – 7.391021 J

5. If we have 1012 tonnes of coal in reserves (ignoring economic viability) and we are using 8 Gt/year, how many more years can we use coal at this rate? – 125 years