Review questions 1. Explain what it means to resolve a vector.
2. Draw simple vector diagrams and resolve them into two
components.
a) 60 N at an angle of 30° from the horizontal,
b) 45 m/s at an angle of 80° from the horizontal.
c) 1900 km at an angle of 40° from the vertical.

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.