Agiven box of 2 kg is in contact with the floor experiences an applied force of 150 form somebody pushing it. while in motion, it also experiences a frictional force of 7n in the opposite direction. calculate the weight of the box

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?