Question 3 A fish swimming in a horizontal plane has velocity vo = (4î+) m/s at a point in the ocean whose
displacement from a certain rock is ro = (10î – 4ſ)m. After swimming with constant acceleration for
20s, its velocity is v = (20î - 5ſ) m/s.
a) What are the components of the acceleration?
b) What is the direction of the acceleration with respect to unit vector i?
c) Where is the fish at t = 25s and in what direction is it moving?
[4]
[2]
[4]

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.