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(a) How much will a spring that has a force constant of 40.0 N/m be stretched by an object with a mass of 0.500 kg when hung motionless from the spring? (b) Calculate the decrease in gravitational potential energy of the 0.500-kg object when it descends this distance. (c) Part of this gravitational energy goes into the spring. Calculate the energy stored in the spring by this stretch, and compare it with the gravitational potential energy. Explain where the rest of the energy might go.
Which area of the ocean is most used by people for recreation?
a. Abyssal plain, because scuba divers enjoy seeing the light-producing organisms and the shipwrecks
b. Littoral zone, because it is near the shoreline and is easily accessible for recreational activities
c. Upwelling zones, because the upward movement makes water sports more competitive
d. Primary dune, because the slopes are enjoyed by skateboarders and they will not be hurt if they fall
e. Profundal zone, because it is deep and dark and pleasant for water skiers