Put the following objects in order of increasing gravitational potential energies. I. a 2 kg book at a height of 12 meters
II. a 6 kg rock at a height of 4 m
III. a 3 kg sack of sugar at a height of 8 m

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?