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Date Posted: 7/24/2008 5:57:59 PM  Status: Live
HELP!! homework due in hour, pleaaase!
Course Textbook Chapter Problem
Algebra Based Physics College Physics (7th) by Serway, Faughn, Bennett 4 N/A
Question Details:
Two packing crates of masses m1 = 10.0 kg and m2 = 3.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 3.50kg crate lies on a smooth incline of angle 44.0°. Find the acceleration of the 3.50 kg crate.
wrong check mark
Your answer differs from the correct answer by 10% to 100%. m/s2 (up the incline)
Find the tension in the string.
wrong check mark
Your answer differs from the correct answer by 10% to 100%. N


Figure P4.26

Answers:

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Date Posted: 7/24/2008 6:36:32 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
Free body diagrams for the two blocks is
             
                
From the figures for the block 1 the equations of motion are
           m1g - T = m1a ....................(1)
Equations of motrion for the block 2 is
            T - m2gsinθ = m2a .........................(2)
Adding the equations (1) and (2) we get
          m1g - m2gsinθ = ( m1 + m2 )a
            
              
By doing the calculation work we get the value of the acceleration(a) of the blocks.
 
b)
From the eq(1) we have
        m1g - T = m1a
         T = m1( g - a )
 Where the acceleration(a) is substituted here which is obtained from the part(a)
                  g = 9.8m/s2
                  m1 = 10kg              
           
Hope this helps. Don't forget to rate the answer.



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