If two resistors of value r are connected in series and then in parallel, what is the difference in equivalent resistance in both cases?
a) 0 b) 3R/2 c)R/2 d)2/R

4. a car with a mass of 2,200 kg can accelerate from 0 to 30 m/s in 6 seconds. a. assuming all of the force generated by the engine goes into acceleration of the car, how much force is the engine producing? show your work. (6 points)