The relaxed length of a vertical spring is 4.22 m. When a 5 kg object is attached to the end of the spring, the vertical length of the spring is 5.72 m and the object is found to be 10. m from the ground. Calculate using significant figures. a) X = m

b) The spring constant K = N/m

c) The elastic potential energy PEe = J

d) The gravitational potential energy PEG = J

e) Given that formula to calculate the total potential energy of the system is PETOTAL = PEG + PEe, calculate the PETOTAL = J

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

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.

Avalue that describes how heavy an object is and is related to the force of gravity is