For pure H2 at 3 atm, estimate the thermodynamic potential difference between pure oxygen and air at 3 Atm. For reformate, H2 is about 25%, estimate the decrease of thermodynamic potential relative to pure H2. If we are to develop a fuel cell under 700 bar with the H2 and air, please estimate the thermodynamic voltage; and comment on the value.

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.

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?

Auniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. what is its kinetic energy?