metric conversions
1200 watts = ____________ kW (kilowatts)
2.4 kW
place 1000 into scientific notation
1x103
A natural gas power plant is 60% efficient. If one cubic meter of natural gas provides 1200 BTUs of electricity. How many BTUs of waste heat were produced?
480 BTU's
What is the birth rate for a country that has a population of 120,000 and 2400 births per year? __________ %
2
The net primary productivity of an ecosystem is 1 kgC/m2/year, and the energy needed by the producers for their own respiration is 1.5 kgC/m2/year. The gross primary productivity of such an ecosystem would be __________________________kgC/m2/year
2.5
1200 kw = ___________ MW (megawatts)
1.2
place 1 million into scientific notation
1x106
The amount of wilderness are increased from 40,000 km2 to 60,000 km2. What is the percent increase? ___________%
50%
What is the birth rate for a country with 35 births per thousand? _______ %
3.5
The gross primary productivity of an ecosystem is 3.5 kgC/m2/year, and the energy needed by the producers for their own respiration is 3.0 kgC/m2/year. What is the net primary productivity of such an ecosystem? __________________ kgC/m2/year
0.5
500 km = _____________ meter
500000 Meters
place one billion into scientific notation
1x109
A 2500 hectare piece of wild chaparral was bought by a developer to turn into homes. The developer build on 1500 hectares and left 1000 hectares untouched. What was the percent decline in wild chaparral? _______________ %
40%
What is the death rate for a country that has a population of 1,500,000 and 60,000 deaths per year? ______ %
4
The net annual primary productivity of a particular wetland ecosystem is found to be 2,000 kcal/m2. If respiration by the aquatic producers is 18,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year? ____________ kcal/m2/year
20,000
60 gram = ______________ milligram
60000 Milligrams
place 23,000 into scientific notation
2.3x104
If the concentration of iron in a water supply changes from 45ppm to 8ppm in a ten-year period, what is the annual percent change of the iron concentration?
8.3% annual decrease
What is the growth rate for a country that has a total population of 11,000,000 with 320,000 births and 650,000 deaths?________ %
-3
The net annual primary productivity of a particular wetland ecosystem if found to be 8,000 kcal/m^2. If respiration by the aquatic producers is 12,000 kcal/m^2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m^2 per year?
20,000 kcal/m^2/yr
14,000 milliliter = ____________ liter
14 Liters
place 256,000 into scientific notation
2.56x105
If the concentration of mercury in a water supply changes from 65 to 39 ppm in a ten-year period, what is the percentage change of the mercury concentration?
40%
What is the growth rate for a country that has 60,000 births and 50,000 deaths per year along with 20,000 people who immigrate in and 10,000 people who emigrate out? The total population is 20,000,000. ______%
0.1
What percent of the sunlight is actually converted into chemical energy via photosynthesis?
less than 1 %