1. Assume the average American car is driven 7000 miles/year.How much carbon (in lbs) is released into the atmosphere by this car? Assume gasoline is octane, with a density of 0.692 g/mL. Assume the car mileage is 20 miles/gallon.

Calculate mass octanol in 1 g gasoline. Calculate mass of C. Calculate gallons of gas used per year. Calculate C release.

2. If a customer replaces a 100 watt bulb with an 18 watt?compact fluorescent bulb that lasts 5000 hours, how much ?less coal (lbs)will be used to generate the electricity that is saved??Assume the electricity is generated with 33% efficiency and the energy?content of the coal is 30 kJ/g.??

Calculate energy savings over lifetime of bulb. Calculate mass of coal saved, including estimate of efficiency.

3. When some large nuclear plants run at full capacity, they produce about ?1100 MW of electrical power. At this rate, what mass of 235U (kg)?would it consume per year if the efficiency of converting nuclear energy ?to electricity is 33%? How many metric tons of coal would be required?to supply the same amount of electricity???

Calculate energy produced by plant per year. Use 200 MeV/fission. Calculate number of fissions to produce this energy, taking into account efficiencies.

4. Think exponential growth

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