### Question Description

Physics

**Directions:** It is important that you provideanswers in your own words. Please focusonly on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copyingand pasting from an “answer” website). Use of direct information from anoutside source is against school policy. *All answers will be checked for plagiarism. Instances of plagiarism* *can result in probation or possibledismissal from the school. *

*Grading:** Please be sure to follow all guidelines (number of sentences/showing allcalculations) and to provide the correct metric units of measure. All questions are 3.33 points. You MUST include units on all your answers. *

*For anymath based questions you must show all your work and explain any numbers thatare not clearly understood by the problem. There is a formula sheet for you to use at the end of the exam. *

1. How is electric potentialenergy similar to gravitational potential energy? How is it different? Where will an electron bound in an atom andhave the largest electrical potential energy?

2. What is a transformer? Explain how a transformer works includingspecific details on step up and step down transformers.

3. Write at least 4 to 5sentences on the different measurements that helped to calculate the speed oflight. There are 3 specific experimentsmentioned in your textbook.

4.

5. What caused magneticfields? What happens If you keepbreaking a magnet in two until you reach a single atom?

6. What is an electricmotor? Explain its operation.

7. State Hooke’s law. A spring will stretch 12 cm when a 250-g massis hung on it. If the 250-g mass is hungon two identical springs, hung sided by side, and both support the 250-g mass,how much will each spring stretch. EXPLAIN.

8. Use 4 to 5 complete sentences,explain the concepts of beats and how beats are produces. Please provide at least 2 examples.

9. Why do atoms haverelatively the same size even though they may have widely different masses?

10. What is the period of asoundwave whose wavelength is 20.0 m? Use values from the book and show ALL of your work.

11. A 60-V potential differentis applied across a parallel combination of a 10-ohm and 20-ohm resistor. What is the current in the 10-ohm resistor? Show your work.

12. What is the powerdissipated by a toaster that has a resistance of 60 ohms and is plugged into a120-V outlet? Show your work.

13. A step up transformer has250 turns on its primary and 500 turns on it secondary. When the primary is connected to a 200 V andthe secondary is connected to a floodlight that draws 5A, what is the poweroutput? Please show ALL of your work.

14. What is the mass of air ina room that has dimensions of 10m x 20m x 4 m? Use values from the book to show your work.

15. About how much pressure dothe feet of a 6000-kg elephant exert on the ground? Assume each foot has an area of 0.10 squaremeter. Please show all your work.

16. The temperature of anobject is raised by 90oC. This is equivalent to whatincrease in its absolute temperature?

17. A supersonic aircraftproduces a shock wave that describes a 30o angle. What happens tothe angle of the cone as the aircraft travels faster?

18. A 2.0-ohm resistor isconnected in a series with a 20.0 -V battery and a three-branch parallelnetwork with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance,what is the current in the batter? Showyour work.

19. Gas A is composed ofdiatomic molecules (two atoms to a molecule) of a pure element. Gas B is composed of monoatomic molecules(one atom to a molecule) of another pure element. Gas A has three times the mass of an equalvolume of gas B at the same temperature and pressure. How do the atomic masses of elements A and Bcompare?

20. Consider a model steelbridge that is 1/100 the exact scale of the real bridge that is to bebuilt.

a. If the model bridge weighs50 N, what will the real bridge weigh?

b. If the model bridge doesnot appear to sag under its own weight, is this evidence the real bridge, builtexactly to scale, will not appear to sag either?

21. Calculate the waterpressure in the pipes at the bottom of a high-rise building that is fed byreservoir 60 m above the roof top.

22. The atmosphere does notordinarily crush cans. However, it will crush a can after it has been heated,capped, and cooled. Explain why thishappens. Be sure to use complete sentences

23. When a 57-gram piece ofaluminum at 100oC is placed in water, it loses 735 calories of heatwhile cooling to 30oC. Calculate the specific health capacity of the aluminum.

24. Your classmate says that ifall the molecules in a particular liquid had the same speed, and some were ableto evaporate, the remaining liquid would not undergo cooling. Do you agree or disagree and what is yourexplanation to support your answer.

25. Would it be correct to saythe Doppler Effect is the apparent change in the speed of a wave due to themotion of the source? Be sure to fully explain your position using at least 3complete content related sentences.

26. The equation E=hf describesthe energy of each photon in a beam of light. If Planck’s constant, h, were larger, would photons of light of the samefrequency be more energetic or less energetic. Be sure to explain using at least 3 content related sentences.

27. A radioisotope is placenear a radiation detector, which registers 80 counts per second. Eight hours later, the detector registersfive counts per section. What is theisotope’s half-life?

28. Write the nuclear equationthat describes the following process. Uranium-235 undergoes an alpha decay toproduce thorium-231.

29. If the uranium nucleus weresplit into three pieces of approximately the same size instead of two, wouldmore energy or less energy be released? Defend your answer in terms of Figure40.14 in your textbook.

30. According to chapter 30 inthe course textbook, describe the time it would take for Earth to orbit thecollapsed sun if the sun collapsed into a black hole.

**Formula Sheet (this is not finished yet)**

Density:d=m/V

Pressure:P = F/A

LiquidPressure: P = dgh

C=Q/mΔT

P=IV

Physics Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible dismissal from the school. Grading: Please be sure to follow all guidelines (number of sentences/showing all calculations) and to provide the correct metric units of measure. All questions are 3.33 points. You MUST include units on all your answers. For any math based questions you must show all your work and explain any numbers that are not clearly understood by the problem. There is a formula sheet for you to use at the end of the exam. 1. How is electric potential energy similar to gravitational potential energy? How is it different? Where will an electron bound in an atom and have the largest electrical potential energy? 2. What is a transformer? Explain how a transformer works including specific details on step up and step down transformers. 3. Write at least 4 to 5 sentences on the different measurements that helped to calculate the speed of light. There are 3 specific experiments mentioned in your textbook. 4. 5. What caused magnetic fields? What happens If you keep breaking a magnet in two until you reach a single atom? 6. What is an electric motor? Explain its operation. 7. State Hooke’s law. A spring will stretch 12 cm when a 250-g mass is hung on it. If the 250-g mass is hung on two identical springs, hung sided by side, and both support the 250-g mass, how much will each spring stretch. EXPLAIN. 8. Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces. Please provide at least 2 examples. 9. Why do atoms have relatively the same size even though they may have widely different masses? 10. What is the period of a soundwave whose wavelength is 20.0 m? Use values from the book and show ALL of your work. 11. A 60-V potential different is applied across a parallel combination of a 10-ohm and 20-ohm resistor. What is the current in the 10-ohm resistor? Show your work. 12. What is the power dissipated by a toaster that has a resistance of 60 ohms and is plugged into a 120-V outlet? Show your work. 13. A step up transformer has 250 turns on its primary and 500 turns on it secondary. When the primary is connected to a 200 V and the secondary is connected to a floodlight that draws 5A, what is the power output? Please show ALL of your work. 14. What is the mass of air in a room that has dimensions of 10m x 20m x 4 m? Use values from the book to show your work. 15. About how much pressure do the feet of a 6000-kg elephant exert on the ground? Assume each foot has an area of 0.10 square meter. Please show all your work. 16. The temperature of an object is raised by 90oC. This is equivalent to what increase in its absolute temperature? 17. A supersonic aircraft produces a shock wave that describes a 30o angle. What happens to the angle of the cone as the aircraft travels faster? 18. A 2.0-ohm resistor is connected in a series with a 20.0 -V battery and a three-branch parallel network with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance, what is the current in the batter? Show your work. 19. Gas A is composed of diatomic molecules (two atoms to a molecule) of a pure element. Gas B is composed of monoatomic molecules (one atom to a molecule) of another pure element. Gas A has three times the mass of an equal volume of gas B at the same temperature and pressure. How do the atomic masses of elements A and B compare? 20. Consider a model steel bridge that is 1/100 the exact scale of the real bridge that is to be built. a. If the model bridge weighs 50 N, what will the real bridge weigh? b. If the model bridge does not appear to sag under its own weight, is this evidence the real bridge, built exactly to scale, will not appear to sag either? 21. Calculate the water pressure in the pipes at the bottom of a high-rise building that is fed by reservoir 60 m above the roof top. 22. The atmosphere does not ordinarily crush cans. However, it will crush a can after it has been heated, capped, and cooled. Explain why this happens. Be sure to use complete sentences 23. When a 57-gram piece of aluminum at 100oC is placed in water, it loses 735 calories of heat while cooling to 30oC. Calculate the specific health capacity of the aluminum. 24. Your classmate says that if all the molecules in a particular liquid had the same speed, and some were able to evaporate, the remaining liquid would not undergo cooling. Do you agree or disagree and what is your explanation to support your answer. 25. Would it be correct to say the Doppler Effect is the apparent change in the speed of a wave due to the motion of the source? Be sure to fully explain your position using at least 3 complete content related sentences. 26. The equation E=hf describes the energy of each photon in a beam of light. If Planck’s constant, h, were larger, would photons of light of the same frequency be more energetic or less energetic. Be sure to explain using at least 3 content related sentences. 27. A radioisotope is place near a radiation detector, which registers 80 counts per second. Eight hours later, the detector registers five counts per section. What is the isotope’s half-life? 28. Write the nuclear equation that describes the following process. Uranium-235 undergoes an alpha decay to produce thorium-231. 29. If the uranium nucleus were split into three pieces of approximately the same size instead of two, would more energy or less energy be released? Defend your answer in terms of Figure 40.14 in your textbook. 30. According to chapter 30 in the course textbook, describe the time it would take for Earth to orbit the collapsed sun if the sun collapsed into a black hole. Formula Sheet (this is not finished yet) Density: d=m/V Pressure: P = F/A Liquid Pressure: P = dgh C=Q/mΔ T P=IV