Practice Quiz

MCAS Physics Exam Practice - Question List

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86. wo students stretch a rope horizontally between them. One student moves one end of the rope up and down repeatedly for a short time.Which of the following describes the frequency of the waves in the rope?
  1. the height that the rope reaches when moved up
  2. the amount of time it takes for one wave to travel the length of the rope
  3. the number of times the rope is moved up and down in a time interval
  4. the distance measured between the crest of one wave and the crest of the next wave in the rope
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87. An engineering student is gathering data on the motion of a model car traveling down a ramp. If energy is conserved, the potential energy of the car at the top of the ramp should equal the kinetic energy of the car at the bottom of the ramp. After the first trial, the student calculates that the kinetic energy at the bottom of the ramp is less than the potential energy at the top of the ramp. Which of the following can best explain this difference?
  1. The car gained a small amount of mass as it moved down the ramp.
  2. The student accidentally accelerated the car at the top of the ramp.
  3. The measured height of the ramp was less than the actual height.
  4. The student did not include the effect of frictional force in the calculation.
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88. The distance of the star Vega from Earth is 1.6 million times greater than the distance of the Sun from Earth. Which of the following best describes the gravitational influence of Vega on Earth?
  1. It is roughly equal to that of the Sun.
  2. Its influence is greater than that of the Sun.
  3. Its influence is small because of its distance.
  4. It influences the magnitude of Earth’s mass.
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89. What is the momentum of a metal disc with a mass of 1.5 kg sliding on a frictionless surface at 0.75 m/s?
  1. 0 50. kg • m/s
  2. 0 85. kg • m/s
  3. 1 1. kg • m/s
  4. 2 0. kg • m/s
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90. 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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