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Praxis II Physics Content Knowledge Exam Prep

1 A student pushes a book across a classroom table. Which of the following statements best explains the difference between the amount of force needed to start the book moving and the amount of force needed to keep it moving?
  1. Less force is needed to start the book moving, because there is less friction than when it is already moving.
  2. Less force is needed to start the book moving, because there is less potential energy in the table than in the book.
  3. More force is needed to start the book moving, because there is more potential energy in the table than in the book.
  4. More force is needed to start the book moving, because there is more friction than when it is already moving.
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2 A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill?
  1. The cart has no energy.
  2. The cart has maximum kinetic energy.
  3. The cart has maximum gravitational potential energy.
  4. The cart has equal gravitational potential and kinetic energy.
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4 Which of the following is possible due to longitudinal waves?
  1. seeing the color red
  2. getting a tan at the beach
  3. hearing the sound of the ocean
  4. riding a wave on a surfboard
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5 A heated rock is placed in a container of water that is cooler than room temperature. Which of the following statements best describes what happens?
  1. Cold is removed from the container of water until the rock, the container, and the water all reach the same final temperature.
  2. The heated rock loses heat to the container of water until the rock, the container, and the water all reach the same final temperature.
  3. The heated rock loses heat to the container of water until the rock, the container, and the water each reach a different final temperature.
  4. Cold is removed from the container of water until the rock, the container, and the water each reach a final temperature lower than their original temperatures.
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