Momentum and Its Conservation

Practice Test
      
  1.A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's velocity?  
  a.   4.33 m/s  
  b.   3.2 m/s  
  c.   1.2 m/s  
  d.   6.3 m/s  
  Hint    
      
  2.FΔt = mΔv is the equation for __________.  
  a.   linear momentum  
  b.   net force  
  c.   impulse-momentum  
  d.   angular momentum  
  Hint    
      
  3.Before a collision, a 35-kg object is moving at +10.0 m/s. Find the impulse that acted on the object if, after the collision, it moves at +8.0 m/s.  
  a.   -7.0×102 kg·m/s  
  b.   7.0×101 kg·m/s  
  c.   -2.8×102kg·m/s  
  d.   -7.0×101 kg·m/s  
  Hint    
      
  4.A 4.75-g bullet is fired with a velocity of 120.0 m/s toward a 20.0-kg stationary solid block resting on a frictionless surface. What is the change in momentum of the bullet if it is embedded in the block?  
  a.   -0.57 kg·m/s  
  b.   5.7 kg·m/s  
  c.   -1.20×103 kg·m/s  
  d.   1.20×103 kg·m/s  
  Hint    

 
   
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