A 100 kg man stands on bathroom scale inside an elevator, on planet where free fall acceleration is 10 m. s^2. Elevator moves down with constant speed 5 m/s up. Reading of the scale is

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30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What is special about a dc circuit ?