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My Physics test answers (please check)

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Apr 24th, 2015
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  1. 1. What is the scientific definition of energy?
  2.  
  3. A.the ability to use the stored potential of an object
  4. B.the ability to use the change in temperature of an object
  5. C.the ability to use the change in direction of an object
  6. D.((the ability to use an applied force in order to make an object move))
  7.  
  8. ________________________________________
  9.  
  10. 2. What happens when electrical energy is used to power stereo speakers?
  11.  
  12. A.Energy is neither lost nor gained as sound energy transforms into electrical energy.
  13. B.Energy is gained as electrical energy transforms into the energy of sound.
  14. C.((Energy is neither lost nor gained as electrical energy is transformed into the energy of sound.))
  15. D. Energy is lost as electrical energy transforms into the energy of sound.
  16.  
  17. ________________________________________
  18.  
  19. 3. According to the law of conservation of energy, when a motorcycle uses 5500 J of chemical energy from gasoline, how much of this energy will be transformed into mechanical, sound, or heat energy?
  20.  
  21. A. 1375 J
  22. B. ((5500 J))
  23. C. 11,000 J
  24. D. 2750 J
  25.  
  26. ________________________________________
  27.  
  28. 4. Which is the relationship between power and work?
  29.  
  30. A.force applied per unit of time
  31. B.((work done per unit of time))
  32. C. force applied through a distance
  33. D. work done per unit of distance
  34.  
  35. ________________________________________
  36.  
  37. 5. How much work is accomplished when a force of 250 N pushes a box across the floor for a distance of 50 meters?
  38.  
  39. A. 12,500 N
  40. B. ((12,500 J))
  41. C. 5 J
  42. D. 5 N
  43.  
  44. ________________________________________
  45.  
  46. 6. According to the scientific definition, which is not an example of work?
  47.  
  48. A. brushing teeth
  49. B. pushing a tack into a block of cork
  50. C. pulling a nail out of a piece of woo
  51. D. ((leaning against a large cargo crate))
  52.  
  53. ________________________________________
  54.  
  55. 7. Which describes how a simple machine can make work easier?
  56.  
  57. A. ((It magnifies the input force so that force is greater.))
  58. B. It magnifies the kinetic energy so that the potential energy is greater.
  59. C. It magnifies the potential energy so that the kinetic energy is greater.
  60. D. It magnifies the output force so that the input force is greater.
  61.  
  62. ________________________________________
  63.  
  64. 8. What principal of a lever is being used in this photograph? (IMAGE LINK: http://tinyurl.com/mv2yvf8)
  65.  
  66. A. A bottle opener is a type of lever that magnifies the output force required.
  67. B. A bottle opener is a type of lever that enables the same work to be done over a shorter distance with less force.
  68.  
  69. C. ((A bottle opener is a lever in which a smaller input force acts over a larger distance so that a larger output force can act over a smaller distance.))
  70.  
  71. D. A bottle opener is a type of lever that reduces the input force required by reducing the distance over which the force is applied.
  72.  
  73. ________________________________________
  74.  
  75. 9. Liz is on a swing. When Liz approaches the highest point of her swinging movement, which statement about her potential and kinetic energy is true?
  76.  
  77. A. ((Potential energy is highest, and kinetic energy is lowest.))
  78. B. Potential energy is lowest, and kinetic energy is highest.
  79. C. Potential and kinetic energy are both at zero.
  80. D. Potential and kinetic energy are equal.
  81.  
  82. ________________________________________
  83.  
  84. 10. When the temperature of an object increases, what happens to the kinetic energy of the particles in the object?
  85.  
  86. A. It equals zero.
  87. B. It decreases.
  88. C. It is conserved.
  89. D. ((It increases.))
  90.  
  91. ________________________________________
  92.  
  93. 11. Which scientific description of heat is accurate?
  94.  
  95. A. ((Heat is the flow of thermal energy from one object to another.))
  96. B. Heat is the total thermal energy of any single object.
  97. C. Heat is the average kinetic energy of atoms in an object.
  98. D. Heat is the total kinetic energy of atoms in an object.
  99.  
  100. ________________________________________
  101.  
  102. 12. How does a pulley make it easier to load cargo onto a cargo ship?
  103.  
  104. A. The pulley increases the force needed to lift the load by moving it over a longer distance. It also changes the direction of the force. As the input force is applied downward, the output force is exerted upward.
  105.  
  106. B. The pulley reduces the force needed to lift the load by moving it over a shorter distance. It also changes the direction of the force. As the input force is applied upward, the output force is exerted downward.
  107.  
  108. C. ((The pulley reduces the force needed to lift the load by moving it over a longer distance. It also changes the direction of the force. As the input force is applied downward, the output force is exerted upward.))
  109.  
  110. D. The pulley increases the force needed to lift the load by moving it over a shorter distance. It also changes the direction of the force. As the input force is applied upward, the output force is exerted downward.
  111.  
  112. ________________________________________
  113.  
  114. 13. Which describes the difference between a bowling ball sitting in the rack waiting to be used and the bowling ball knocking pins down?
  115.  
  116. A. In the rack and when knocking down pins, the potential energy and the kinetic energy of the bowling ball are equal.
  117.  
  118. B. ((In the rack, the bowling ball has only potential energy. As it knocks pins down, its potential energy has decreased, while its kinetic energy has increased.))
  119.  
  120. C. In the rack, the bowling ball has no energy at all. As it knocks down the pins the energy is 75% kinetic and 25% potential.
  121.  
  122. D. In the rack, the bowling ball has only kinetic energy. As it knocks pins down, its potential energy has increased, while its kinetic energy has decreased.
  123.  
  124. ________________________________________
  125.  
  126. 14. Which is an accurate description of the thermal energy of an entire house when compared with the thermal energy of a small bedroom in that house at the same temperature?
  127.  
  128. A. ((The total kinetic energy of the particles in a substance is its thermal energy. The particles in the entire house are more spread out, so it contains fewer particles than the bedroom. Therefore, it is the bedroom that has the greater thermal energy.))
  129.  
  130. B. The total potential energy of the particles in a substance is its thermal energy. The entire house is larger than the small bedroom, so it contains more particles. Therefore, the entire house has the greater thermal energy.
  131.  
  132. C. The total kinetic energy and potential energy of the particles in a substance is its thermal energy. The entire house is larger than the small bedroom, so it contains more particles. Therefore, the entire house has the greater thermal energy.
  133.  
  134. D. The total potential energy of the particles in a substance is its thermal energy. The particles in the entire house are more spread out, so it contains fewer particles than the bedroom. Therefore, it is the bedroom that has the greater thermal energy.
  135.  
  136. ________________________________________
  137.  
  138. 15. Solar energy is used to heat hot water in homes.
  139.  
  140. Which describes what happens to the solar energy?
  141.  
  142. A. Solar energy is conserved as it creates thermal energy.
  143. B. ((Solar energy is transformed into thermal energy.))
  144. C. Solar energy and thermal energy maintain kinetic equilibrium.
  145. D. Solar energy is destroyed at the rate that thermal energy is created.
  146.  
  147. ________________________________________
  148.  
  149. 16. Use this formula to solve this problem:
  150.  
  151. Power (P) = Work (W) ÷ time (t)
  152.  
  153. Joachim's body supplies a force of 450 N to run up a 20 meter hill in 15 seconds.
  154.  
  155. How much power is involved in Joachim's run up the hill?
  156.  
  157.  
  158. A. ((600 Watts))
  159. B. 22.5 Watts
  160. C. 300 Watts
  161. D. 30 Watts
  162.  
  163. ________________________________________
  164.  
  165. 17. How do two objects at different temperatures attain thermal equilibrium?
  166.  
  167. A. As the two objects touch, thermal energy flows from the colder block to the warmer block until both blocks have the same amount of heat energy and kinetic energy.
  168.  
  169. B. As the two objects touch, thermal energy flows as heat from surrounding air until particles in both blocks become stationary and reach the same temperature.
  170.  
  171. C. As the two objects touch, kinetic energy flows as heat from the warmer block to the colder block until both blocks reach the same temperature and have the same thermal energy.
  172.  
  173. D. ((As the two objects touch, thermal energy flows as heat from the warmer block to the colder block until particles in both blocks move at the same rate and reach the same temperature.))
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