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1.
The adjacent graph shows the extension (
) of a wire of length 1m suspended from the top of a roof at one end and with a load W connected to the other end. If the cross-sectional area of the wire is 
, calculate the Young's modulus of the material of the wire.
) of a wire of length 1m suspended from the top of a roof at one end and with a load W connected to the other end. If the cross-sectional area of the wire is , calculate the Young's modulus of the material of the wire.
2.
Hooke's law defines
3.
If the shear modulus of a wire material is 5.9
then the potential energy of a wire of 
in diameter and 5 cm long twisted through an angle of 10' , is
then the potential energy of a wire of in diameter and 5 cm long twisted through an angle of 10' , is