(20 ! ) an object that is 0.5 m above the ground has the same amount of potential energy as a spring that is stretched 0.5 m. each distance is then doubled. how will the potential energies of the object and the spring compare after the distances are doubled? the gravitational potential energy of the object will be two times greater than the elastic potential energy of the spring. the elastic potential energy of the spring will be four times greater than the gravitational potential energy of the object. the elastic potential energy of the spring will be two times greater than the gravitational potential energy of the object. the potential energies will remain equal to one another.

In what direction does the medium move relative to the direction of the wave? explain.

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight