Help me solve part c please
the assignment is on Elastic potential energy and Hooke’s Law.

Can someone explain to me how to do this problem ?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

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?