waecE-LEARNING
Physics Paper 2, Nov/Dec. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength
















Question 4

(Question 4
A wire of length 55 m and force constant 700 Nm-1 extends to 55.06 m when loaded.  Calculate the work done by the load.

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comments

 This question was well understood and also well attempted by most candidates as they were able to use the relation w = ½ ke2 correctly.  However, very few use wrong formula.  That is w = ½ ke and arithmetic blunder thus  = 55.06 – 55 = 0.6.Instead of 0.06          
The expected solution is
Work done      =          ½ Ke2                                                                                     
                        =          ½ x 700 x (55.06 – 55)2                                                         
                        =          1.26 J              

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