As shown below, two blocks of equal mass m are attached to a string that is part of a pulley system. One block is on a flat, horizontal surface while the other is on a surface inclined at an angle of 45°. If no friction is acting upon the system, the magnitude of the acceleration of the system is _.

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?