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# Physics Help watch

1. 2) A metal column shortens by 0.25mm when a load of 120 kN is placed upon it. Calculate the energy stored in the column and the loss in gravitational potential energy of the load.

2. energy stored is area of force cmopression graph...... not sure about gavitation potential energy but i think its the change in mgh ( mass x acc due to gravity x height)
3. In theory the gravitational potential energy lost by the load should be equal to to the elastic potential energy of the column so both answers are the same.

To find the loss in potential energy use the formula : MGH - mgh (change in potentail energy). This would be equal to the energy stored in the column.
4. And also remember that no other data is given to you to calculate any other form of energy that might be stored so only the compression caused by the load matters which compresses the column ans thus stores elastic potential energy in it. Also the mass can be found from the weight by the formula W=mg(g=9.81).

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