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Final answer:When nothing is hanging from the spring, the pointer will indicate 0 mm. The weight of the third package is calculated using thedisplacementof the spring when the package is hung, resorting to Hooke's Law and the concept of weight.Explanation:The subject matter of this question pertains toPhysics, specifically the concepts of force and equilibrium in mechanics. Moving on to the question, when no package is hung from the spring, the pointer should indicate 0 mm on the scale, assuming the spring is in its natural, unstretched position. This is because the spring is not experiencing any external force that would cause it to stretch or compress.For the weight of the third package, you would need to observe the displacement of the spring (from 0 mm) indicated by the pointer when the package is hung. Then using Hooke's Law (Force = Spring Constant x Displacement), you can calculate the force exerted by the package, which is its weight (since Weight = Mass x Gravity). Specifically, to get the weight, you would need to multiply the spring constant (which can be found by hanging known weights and observing the displacement) by the displacement caused by the third package.Learn more about Physics - Force and Equilibrium here:brainly.com/question/31752250#SPJ11...