      
              <b>Q5.</b> 
              Give the equation for the strain energy stored in the spring?   <br/><br/> 
              <b>Q6.</b> 
               Give the equation for the maximum shear stress at any section of the rod?   <br/><br/> 
              <b>Q7.</b> 
               Give the equation for deflection of the spring.  <br/><br/> 
              <b>Q8.</b> 
              What is meant by stiffness of a spring?   <br/><br/> 
              
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