M Nick and Paul are rock climbing, each moving up with a constant velocity of 0.85 . Nick has a mass of 68 kg,
S
and Paul has a mass of 82 kg. At one point, Nick is 5.0 m above the ground, and Paul is 1.0 m higher than
m
Nick. Use g = 9.8
82
What is the mechanical energy of the Nick and Paul system at this point?

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.