Starting with a spring index of C = 10, design a compression coil spring of phosphor bronze with closed ends. The spring is to deflect y = 2 in, for an applied force of F = 15 lbf and to close solid when ys = 3 in. At closure, use a design factor of 1.2 guarding against yielding. Determine the smallest-diameter wire based on preferred sizes. For the design, specify the wire diameter, the inside and outside diameters of the coil, the spring rate, the total number of coils, the free length of the spring,

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.