T1+-+K - PHY 121 Test 1 Key NB Explanations are provided...

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PHY 121 – Test 1 – Key Fall 2011 NB: Explanations are provided only for questions requiring quantitative answers. 1. A prominent feature of the current American oil crisis is that a) oil production has steadily declined since 1950. b) oil consumption has exceeded oil production for over 4 decades. c) we are committed to exporting most of our national oil. d) the federal government has forbidden the development of new oil fields. e) all of the above. 2. The adjacent graph represents the evolution in time for the net energy consumption in the U.S. broken into primary energy sources. Based on the graph, estimate how large was the drop in the energy consumption due to the OPEC embargo in the mid 70’s, and which source contributed the most to this drop? a) About 8% due to petroleum. b) About 2% due to petroleum. c) 0%. About 1% due to natural gas. e) About 7% due to nuclear energy. 3. The adjacent graph represents the breakdown of the energy use for the transportation sector in the U.S. in 2003. Based on Graphs 1 and 2, and knowing that the transportation sector consume about one third of the total energy, how much would the net use of energy decrease if the energy used by the automobiles were reduced by 10%? a) About 2 billion barrels b) About 8 billion barrels. c) About 0.6 billion barrels. About 0.2 billion barrels. e) No reduction, since the auto oil consumption is not from proven reserves. 4. Per capita energy use and per capita gross domestic product are a) generally unrelated. b) generally strongly correlated. c) the same for all countries. inversely related. e) never compared. 5. The meaning of an “energy gap” for the United States is a) a time gap between discovery and production of an energy reserve. b) a philosophical gap between energy producers and energy consumers. c) a technological gap between American and European manufacturers. an educational gap between the government and the public on energy issues. e) a difference between energy production and energy consumption in the United States. 6. The United States with 5% of the world population accounts for about _____ of the world’s energy use. a) 25% b) 6% c) 50% 75% e) 100% Explanation : Based on Graph 1, the energy consumption in 2003 was about 17.5 billion barrels (bb), out of which transportation uses about 5.8 bb. Based on Graph 2, automobiles used 33% of this amount, that is, about 1.9 bb. Hence, a 10% consumption decrease means 0.19 bb ~ 0.2 bb. Graph 1: Graph 2:
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PHY 121 – Test 1 – Key Fall 2011 7. Of those energy supplies listed below, the one used most in electric power plants is a) petroleum b) natural gas c) wind d) nuclear e) coal 8. Megawatts and kilowatt-hours are units of a) energy. b) energy and power, respectively. c) power and energy, respectively. power. e) work and energy, respectively. 9. From the standpoint of different systems of units, a meter is to a foot as a newton is to a a) kilogram.
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T1+-+K - PHY 121 Test 1 Key NB Explanations are provided...

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