Show ALL equations, significance, units, and work in solving following problems. Use dimensional analysis whenever possible.

1. A 500 g piece of iron changes 7°C when heat is added. How much heat energy produced this change in temperature?

2. When 300. cal of energy is lost from a 125 g object, the temperature decreases from 45.0°C to 40.0°C. What is the specific heat of this object?

3. 1,200 cal of heat energy is added to a liquid with a specific heat of 0.57 cal/g°C. If the temperature increases from 20.°C to 33°C, what is the mass of the liquid?

4. A piece of food is burned in a calorimeter that contains 200.0 g of water. If the temperature of the water rose from 65.0°F to 105.0°F, how much heat energy was contained in the food?

5. If the tested food in problem #4 had a mass of 10.0 grams, how many food calories per gram were contained in the food?

6. If a piece of aluminum metal with a mass of 65.5 hectograms has a temperature of 50.0 o C and it is dropped into a swimming pool full of water at 25.0 oC, how much heat energy was transferred to the pool water?
Cp for Al is 0.8897 J/gCo

7. A hot cup of tea is often a beverage of choice in the winter because it warms us up. The temperature of the tea is 50.0oC and the normal body temperature is 37.2oC. If you drink a cup of tea with a mass of 256.3 grams, how much heat energy was transferred to your body? Cp of water = 4.184 J/gCo

8. How much energy is required to heat a #10 iron nail with a mass of 7.0 grams from 250 oC until it becomes red hot at 7500 oC.

9. If 5750 joules of energy are added to 455 grams of granite at 24.00 C, what is the final temperature of the granite? Cp granite is 0.79 J/g oC.

10. If a piece of aluminum with a mass of 3.99 g and a temperature of 100.0 oC is dropped in 10.0 cm3 of water at 21.0 oC, what will be the final temperature of the system? (Hint: Remember the density of water is 1.00 g / mL)

11. A piece of unknown metal with a mass of 5.19 g is heated to 100.00 oC and dropped into 10.0 mL of water at 22.00 oC. The final temperature of the system is 23.83 oC. What is the specific heat capacity of the metal? Attempt to identify the metal using the attached data.

12. If a piece of cadmium with a mass of 37.60 g and a temperature of 100.0 oC is dropped into 25.00 cc of water at 23.0 oC, what will be the final temperature of the

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)

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving