An engineer draws a diagram of the track for a rollercoaster. The first hill is labeled at position A, and the track ends at position F. How does the gravitational potential energy of the rollercoaster change as it travels between the following points? Select the correct answer for each description. *

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?