Physics Essay

593 words - 3 pages

Physical Science Final Exam
Name: _____________________________
Student Number: ____________________
Short Answer/Fill in the Blank: Type your answer in the blank, or in the space below the question. Do not use the internet, please use ONLY the textbook to create your solutions. Do not use outside sources.When you are ready to submit your exam for grading, attach the document to the Final Exam link in the left hand column. |

Completion
Complete each statement.  |
  |  1.  | A car that increases its speed from 20 km/h to 100 km/h undergoes ____________________ acceleration.  |
  |  2.  | It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually ____________________ than sliding friction.  |
  |  3.  | In a closed system, the loss of momentum of one object ____________________ the gain in momentum of ...view middle of the document...

  |
  |  8.  | The region where a magnet's force is strongest is at the_________________________.  |
  |  9.  | The magnetic field lines of a bar magnet begin near the magnet’s ____________________.  |
  |  10.  | The energy source used to produce most of the electrical energy in the United States is ____________________.  |
Short Answer Type your answer in the in the space below the question. Do not use the internet, please use ONLY the textbook to create your solutions. Do not use outside sources.  |
  |  11.  | Identify two types of nuclear reactions in which the equation E = mc2 applies.  |
  |  12.  | Based on how the book describes a heat pump in Sec 16.3, how does a heat pump prove the law of conservation of energy?   |
  |  13.  | What is a medium?   |
  |  14.  | Which waves have wavelengths longer than those of visible light? Give an example of how each kind of wave is used.  |
  |  15.  | How much energy does a 50-watt light bulb use compared to a 100-watt light bulb if both are shining for the same length of time? Explain your answer.   |
  |  16.  | How does the strength of an electromagnet depend on the current and the number of turns in the coil?  |
Problem Do not use the internet, please use ONLY formulas from the textbook to create your solutions  |
  |  17.  | During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner’s acceleration? Show your work.  |
  |  18.  | If you ride your bike at an average speed of 4 km/h and need to travel a total distance of 28 km, how long will it take you to reach your destination? Show your work.  |
  |  19.  | A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work.  |
  |  20.  | As 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 3.9 J/g·°C. Show your work.  |

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