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Chapter 20: Applied Physics
      
  1.Motion involves  
  a.   force.  
  b.   friction.  
  c.   gravity.  
  d.   all of the above.  
      
  2.The force that acts in the direction opposite the direction of the motion is  
  a.   gravity.  
  b.   friction.  
  c.   energy.  
  d.   pressure.  
      
  3.The minimum speed at which an object must travel to escape Earth's gravitational pull is  
  a.   equal to or greater than the object's weight.  
  b.   the escape velocity.  
  c.   40,000 km/h.  
  d.   both b and c.  
      
  4.Which of the following is not one of Newton's laws of motion?  
  a.   For every action, there is an equal and opposite reaction.  
  b.   Objects move only when a force is applied to them.  
  c.   An object at rest will stay at rest, and an object in motion will stay in motion.  
  d.   The rate at which an object moves depends on the size of the unbalanced force acting on it and the mass of the object.  
      
  5.To calculate work, multiply the force by the  
  a.   distance.  
  b.   time.  
  c.   weight.  
  d.   mass.  
      
  6.Sound travels most easily through  
  a.   solid material.  
  b.   liquids.  
  c.   a vacuum.  
  d.   gases.  
      
  7.Sound that is so high-pitched that we cannot hear it is  
  a.   high amplitude.  
  b.   sound energy.  
  c.   sonar.  
  d.   ultrasound.  
      
  8.The source of all light energy is  
  a.   electricity.  
  b.   the atom.  
  c.   photons.  
  d.   electromagnetic waves.  
      
  9.The four important properties of light are speed, amplitude, frequency, and  
  a.   electromagnetism.  
  b.   pattern.  
  c.   wavelength.  
  d.   visibility.  
      
  10.A narrow, high-energy beam of parallel light rays is  
  a.   incandescent.  
  b.   a microwave.  
  c.   a laser beam.  
  d.   visible light.  

 

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