A bowling ball rolled with a force of 15 N accelerates at a rate of 3 m/sec; a second ball rolled with the same force accelerates 4 m/sec. What are the masses of the two balls?

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?