Chapter 1 Questions 1 Smart Rocks are considered for a Ballistic missile defense 2 One watt is equivalent to a One joule sec 3 The asteroid that killed the dinosaurs exploded because a It got very hot from the impact 4 Kinetic energy can be measured in a Calories 5 Which of the following statements is true a Power is energy divided by time 6 Next to 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 What is the main reason that hydrogen driven automobiles have not replaced gasoline ones a Hydrogen is too difficult to store in an automobile 8 Hybrid vehicles run on a Electric power and gasoline 9 Compared to an equal weight of gasoline uranium 235 can deliver energy that is greater by a factor of pick the closest 10 What contains the most energy per gram a One million a Uranium batteries 11 Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight a The gasoline has about 400 times as much energy b Or 10x 12 The kinetic energy of a typical 1 gram meteor is approximately equal to the energy of a 10 grams of gasoline b or 150 grams of gasoline 13 The kinetic energy of a bullet per gram is within a factor of 2 a About the same as the energy released from one gram of TNT 14 Coal reserves in the United States are expected to last for a Hundreds of years 15 A limitation for all electric automobiles is a Low energy density per battery b Or electric motors are less efficient than gas motors 16 Solar power is about mark all that are correct a 1 kW per square meter b 1 GW per sq km 17 The efficiency of inexpensive solar cells is closest to 18 A human running up stairs can briefly use power of approximately 19 A 12 oz can of soft drink not the diet or lite kind contains about a 12 a 1 horsepower a 150 Calories 20 A large nuclear power plant delivers energy of about a Gigawatt 21 Which is not a unit of energy a Watt 22 Compared to TNT a typical meteor with the same mass has energy that is 23 What is the least expensive for the same energy delivered a 100 times larger a Coal 24 Electricity from AAA battery costs the consumer about a 1000 per kilowatt hour 25 Electricity from a wall plug costs the consumer about a 10 cents per kilowatt hour 26 The energy per gallon of liquid hydrogen compared to gasoline is about a 3 times more b or 3 times less 27 Most of the hydrogen we use in the United States comes from It is manufactured from fossil fuels and or water a b Or from nuclear reactors 28 You have 10 tungsten bulbs and each uses 100 watts You leave them all on for an hour The energy used is a 1 Kilowatt hour 29 What are the units for power a Watts b Kilowatts c Horsepower 30 If you double the energy content of a kilogram of gas the temperature of the gas measured on the absolute K scale a doubles 31 About how fast are molecules in air moving a 1000 ft s b or the speed of light 32 Temperature is the measure of a average kinetic energy a approximately 1000 ft s 34 A refrigerator operating in a room a warms the room 33 In a bucket of water the instantaneous speed of the molecules is closest to 41 If a gasoline engine produces a hotter explosion then the efficiency of the engine 35 a refrigerator with its door open is operating in a room it a has no effect on the room 36 The atom with the fewest number of protons is 37 How many atoms are there if you move across a human hair About a hydrogen a 125 000 38 The speed of sound is approximately a 1000 feet per second 39 A gas heater warms a room mostly through a convection 40 The velocity of sound a increases when the temperature increases should a goes up a expanding sea water a 4 F 42 Sea level is rising from global warming The main cause is 43 The temperature warms by 2 C That is approximately the same as 44 To heat a room using the least energy do it by a using natural gas to run a heat pump b or coal 45 There is almost no hydrogen gas in the atmosphere because a it escapes the earth s gravity 46 The New Orleans levees failed because a they were weaker at the thermal expansion joints 47 For a typical auto the fraction of the gasoline energy wasted as heat is about careful this may be a trick question 48 At what temperature does ice melt a 80 a 0 c 49 Temperature in the sun a is not well defined 50 When material is cooler a some things contract and some expand 51 The melting temperature of an object is usually a equal to its freezing point 52 Absolute zero is the temperature of a nothing b or liquid helium a 1000 53 When a liquid boils the increase in volume liquid to gas is typically a factor of 54 If the temperature of a gas in a container goes from 0 C to 300 C the pressure will 57 To be more efficient the temperature difference between the ignited hot fuel and a become 300 times greater 55 Fire walking is similar to a water on a saucepan 56 For gasoline to explode it requires a to be mixed with oxygen the cool part of the engine should be a as large as possible 58 Heat flow through empty space no atoms present a occurs through radiation 59 Entropy optional topic measures a disorder would be about 100000 C a b or 30000 a 2 feet b or 12 feet 62 Molecular motion stops at a 0 K 60 At Mach 10 if all the energy of a meteorite went into heating it its temperature 61 If temperature rises by 5 C 9 F then the rise in sea level will be about 63 A table has the same temperature as the air above it That means that the 64 a cup full of water and made of plastic feels warmer than one made of glass molecules in the air and in the table have a The same average energy because a plastic conducts heat better than glass 65 Put hot glass in cool water It shatters because a the outer surface of the glass contracts rapidly but the inner part doesn t 66 when a liquid boils the increase in volume liquid to gas is typically a factor of a All of the above energy for volcanoes helium for toy balloons heat for a 1000 a Fusion 67 Energy in the Sun is produced primarily by 68 The mass of the nucleus …
View Full Document
Unlocking...