Physics 1020 Exam 1 Chapters 1 2 4 1 Smart rocks are considered for A geologic dating B ballistic missile defense C nuclear power D solar power 2 One watt is equivalent to A one joule second B one coulomb second C one calorie second D one horsepower 3 The asteroid that killed the dinosaurs exploded because A it was made of explosive material B it was made of U 235 C it got very hot from the impact D It didn t explode it knocked the Earth out of its normal orbit 4 Kinetic energy can be measure in A watts B calories C grams D amperes 5 Which of the following statements is true A Energy is measured in joules and power is measured in calories B Power is energy divided by time C Batteries release energy but TNT releases power D Power signifies a very large value of energy E All of the above 6 For each of these mark whether it is a unit of energy E or power P A horsepower P B kilowatt hour E C watt P D calorie E 7 Hybrid vehicles run on A electric and solar power B solar power and gasoline C electric power and gasoline D nuclear power and gasoline 8 What is the main reason that hydrogen driven automobiles have not replaced gasoline ones A Hydrogen is too expensive B Hydrogen is too difficult to store in an automobile C Hydrogen is radioactive and the public fears it D Hydrogen mixed wit air is explosive 9 Compared to an equal weight of gasoline U 235 can deliver energy that is greater by a factor of choose the closest value A 2200 B 25 000 C one million D one billion 10 Which of the following contains the most energy per gram A TNT B chocolate chip cookies C battery D uranium 11 Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries A The gasoline has about 400 times as much energy B The gasoline has about 10 times as much energy C The gasoline has about 70 times less energy D They cannot be honestly compared since one stores power and the other stores energy 12 Which is least expensive for the same energy delivered A coal B gasoline C natural gas D AAA batteries 13 The kinetic energy of a typical 1 gram meteor is approximately equal to the energy of A 10 grams of TNT B 150 grams of TNT C 1 100 grams of TNT D 10 grams of gasoline 14 Coal reserves in the United States are expected to last for A hundreds of years B three or four decades C 72 years D less than a decade 15 A limitation for all electric automobiles is A Low energy density per battery B Batteries explode more readily than gasoline C Electric energy is not useful for autos D Electric motors are less efficient than gasoline motors 16 Solar power is about choose all that are correct A 1 watt per square meter B 1 kW per square meter C 1 megawatt per square km D 1 gigawatt per square km 17 The efficiency of inexpensive solar cells is closest to A 1 B 12 C 65 D 100 18 A human running up stairs can briefly use power of approximately A 0 01 horsepower B 0 1 horsepower C 0 2 horsepower D 1 horsepower 19 A 12 oz can of soft drink not the diet or lite kind contains about A 10 calories B 50 calories C 150 calories D 2000 calories 20 A large nuclear power plant delivers energy of about A 1 megawatt B 1 gigawatt C 100 gigawatts D 1000 gigawatts 21 Electricity from a AAA battery costs the consumer about A 1 cent per kilowatt hour B 10 cents per kilowatt hour C 1 per kilowatt hour D 1000 per kilowatt hour 22 Electricity from a wall plug costs the consumer about A 1 cent per kilowatt hour B 10 cents per kilowatt hour C 1 per kilowatt hour D 1000 per kilowatt hour 23 The energy per gallon not per pound of liquid hydrogen compared to gasoline is about A 3x less B about the same C 3x more D 12x more 24 Most of the hydrogen we use in the United States comes from A pockets of hydrogen gas found underground B hydrogen gas extracted from the atmosphere C hydrogen produced in nuclear reactors D It is manufactured from fossil fuels and or water 25 You have 10 tungsten bulbs and each uses 100 watts You leave them all on for an hour The energy used is A 10 kilowatt hours B 1 kilowatt hour C 10 kilowatts D 1000 watts 26 The kinetic energy of a bullet per gram is within a factor of 2 A about the same as the energy released from 1 gram of TNT B about the same as the kinetic energy in a typical 1 gram meteor C about the same as the energy released by 1 gram of chocolate chip cookies D none of the above 1 If you double the energy content of a kilogram of gas the temperature of the gas measured on the absolute K scale A is unchanged B increases by the square root of 2 C doubles D is multiplied by 4 2 About how fast are molecules in air moving A 1000 ft sec B the speed of light C 9 8 m sec D 9 8 cm sec 3 Temperature is the measure of A average momentum B average kinetic energy C average velocity D average total energy 4 In a bucket of water the instantaneous speed of the molecules is closest to A zero since they don t move B whatever speed the wood is moving C approximately 1 7 meters per second D approximately 1000 feet per second E approximately 186 000 miles per second 5 A refrigerator operating in a room A warms the room B cools the room C has no effect on the room D removes water vapor from the room 6 A refrigerator with its door open is operating in a room It A warms the room B cools the room C has no effect on the room D removes water vapor from the room 7 A table has the same temperature as the air above it That means that the molecules in the air and in the table have A the same average velocity B the same average energy C the same average acceleration D the same average mass 8 Ice melts at A 0 K B 0 C C 0 F D 100 C 9 A gas heater warms a room mostly through A convection B conduction C radiation D depletion 10 The velocity of sound A increases when the temperature increases B decreases when the temperature increases C depends on the pressure of the air D is constant independent of the temperature 11 If a gasoline engine produces a hotter explosion then the efficiency of the engine should A be the same B go up C …
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