The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph to answer the following questions. At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has volume and shape. With each passing minute, is added to the substance. At point B, the temperature of the substance is °C. The solid begins to . At point C, the substance is completely or in a state. Material in this phase has volume but not shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a to a . This heat energy is called the latent heat. Between 9 and 13 minutes, the added energy increases the of the substance. During the time from point D to point E, the liquid is . By point E, the substance is completely in the phase. Material in this phase has volume or shape. The energy put to the substance between minutes 13 and 18 converted the substance from a to a state. This heat energy is called the latent heat. Beyond point E, the substance is still in the phase. Which of these three substances was likely used in this phase change experiment ?SubstanceMelting pointBoiling pointBolognium20 °C100 °CUnobtainium40 °C140 °CFoosium70 °C140 °C 1. Vaporization is the change from: a. liquid to gas. b. solid to liquid. c. gas to solid. d. solid to gas to solid. e. gas to liquid.2. The change from gas to liquid is called: a. boiling. b. condensation. c. distillation. d. melting. e. sublimation.3. How many phase changes have latent heat that is gained ? 4. How many phase changes have latent heat that is lost ? 5. What are the 2 examples of the phase change from liquid to gas?6. How many phases are there ? 7. How many phase changes did we list in the chart ? Use the above graph for the following 4 questions.8. During which interval of the graph is a phase change occurring ?a. A to B b. E to F c. C to D d. D to E9. During which interval does water get heated ?a. A to Bb. E to F c. C to D d. D to E10. At what point does vaporization end ?a. A b. E c. C d. D e. B11. At what point does melting start ?a. A b. E c. C d. D e. B12. You cannot see water vapor. a. true b. false13. List the phases from greatest to least energy.

1. a student believes that colder water makes fish swim faster. he sets up an experiment using different temperatures of water and measures the speed of the fish. (chapter 1 – page 9) a. what is the independent variable? b. what is the dependent variable? c. list two constants the student should have for this experiment. 2. convert 0.375 mg to grams. show your work with units in order to receive credit. (chapter 1 – page 16) 3. a race car drives one lap around a race track that is 500 meters in length. (chapter 2 – pages 45-46) a. what is the driver’s displacement at the end of the lap? b. how is his displacement different from the distance traveled? 4. how far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s? show the appropriate equation from your textbook and show your work with units in order to receive credit. (chapter 2 – pages 46-47) 5. two cars, both with a mass of 500 kg, are traveling down a road. the first car has a velocity of 65 m/s east and the second car has a velocity of 85 m/s west. (chapter 2 – pages 54-55) a. calculate the momentum of both cars showing the appropriate equation from your textbook and your work with units in order to receive credit. b. which car has the larger momentum? explain how you know. 6. an airplane traveling at 60 m/s comes to a stop in 10 seconds. calculate the airplane’s acceleration. show the appropriate formula and show your work with units in order to receive credit. (chapter 2 – pages 57-58) 7. an individual has a weight of 735 newtons. what is the individual’s mass? show the appropriate equation from your book and show your work with the units in order to receive credit. (chapter 3 – pages 78-79) 8. in terms of newton’s first law of motion, explain why it is important to wear a seatbelt while riding in a car. (chapter 3 – page 86) 9. if you kick a tennis ball with 50 n of force and then kick a soccer ball with 50 n of force, explain the difference in their motion according to newton’s second law. (chapter 3 – pages 81-82) 10. describe how the velocity and acceleration of a skydiver changes as she falls from the plane back to the ground. (chapter 3 – pages 88-89) 11. a child is swinging on swing. describe what happens to both the kinetic energy and potential energy of the child as she swings up and down. (chapter 4 – pages 123) 12. driving to work one morning, you get a flat tire. when using the car jack, you apply 120 n of force to the jack and the jack in turn applies 2000 n of force to lift the car up. what is the mechanical advantage of the jack? (chapter 4 – page 111) 13. a temperature of a 50 kg block increases by 15°c when 337,500 j of thermal energy are added to the block. (chapter 5 – pages 141-142) a. what is the specific heat of the object? show the appropriate equation from your book and show your work with units. b. what is the block made of? use the chart on page 141. c. is this block a good material for insulators or conductors? 14. explain why gases make better thermal insulators than solids or liquids. give one example from the textbook of a thermal insulator that can keep you warm on a cold day. (chapter 5 – pages 147) 15. several days after a snowfall, the roofs of some homes on your street have almost no snow on them, while the roofs on other homes are still snow covered. assuming they have all received the same amount of sunlight, give one reason for this observation related to thermal energy and insulation. 16. if you purchased a string of lights, how could you determine if the lights were wired in series or parallel? (chapter 6 – pages 185-186) 17. what happens to the current in a device if the resistance is decreased but the voltage stays the same? (chapter 6 – pages 181-182) 18. you measure the voltage difference of a circuit to be 15 v and the resistance to be 675 ω. what is the current in the circuit? show the appropriate equation from your book and show your work with units. (chapter 6 – page 182) 19. explain why a magnet from your refrigerator could not be used to lift something as heavy as a car. (chapter 7 – pages 202-203)

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?