Final answer:
To estimate the total energy needed to form a neck during a tension test on a hypothetical metal that experiences both elastic and plastic deformation, we can use the concept of elastic modulus, also known as Young's modulus. This measures the stiffness of a material. The elastic deformation is reversible, while the plastic deformation is irreversible.
Step-by-step explanation:
In order to estimate the total energy needed to form a neck during a tension test on a hypothetical metal that experiences both elastic and plastic deformation, we need to consider the concept of elastic modulus. The elastic modulus, also known as Young's modulus, measures the stiffness of a material.
When a material undergoes tensile stress, it experiences both elastic and plastic deformation. The elastic deformation is reversible, meaning the material returns to its original shape when the stress is removed. On the other hand, plastic deformation is irreversible.
To calculate the total energy needed to form a neck during a tension test, we would need more specific information about the metal and the scenario. However, we can use the concept of elastic modulus to estimate the energy required.