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posted by  indra on 11/7/2009 12:29:58 AM  |  status: Closed  |  Earned Karma: 50

Please, need help,force, speed

Course Textbook Chapter Problem Needs by
Calculus Based Physics University Physics with Modern Physics (12th) by Young, Freedman Speed N/A 11/9/2009 at 2:00:00 PM
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Hi,
Please, need help, and step by step.
Thank You
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posted by Justin_08 on 11/7/2009 12:02:48 PM  |  status: Live
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Response Details:

        Given that the mass of block is m = 0.263 kg
       Spring constant is k = 2.52 N/m 
       compressed length of spring from relaxed position is x = 0.118 m
---------------------------------------------------------------------------

     (a) Work done by gravity is Wg = m g x   
                                                      =  ------------ J 
     (b) Work done by spring is Ws = (1/2)kx2
                                                     = ---------- J
     (c) Apply conservation of energy just before block strike the spring and at compressed position 
                                    (1/2 )m v2 = (1/2)kx2  - mgx
                                                v2 = kx2 / m - 2gx 
                                                v =  [  kx2 / m  - 2gx ]1/2        
                                                   = ----------- m/s
     (d) If the speed is doubled 
      Apply conservation of energy just before block strike the spring and at compressed position 
                                    (1/2 )m (2v)2 = (1/2)kx2  - mgx 
                                    slove for x = ---------- m                           
               
    
           
 
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