SPAN 1P95 Lecture 10: Lecture 10

1. What isthe current that can be generated ina fuel cell using a hydrogen flowrate 2 ml/min at 2 atm and 80^oC? N= I/nF, R=0.082 latm/mol K , F=96485 Coulomb/equivalent. How much air is required atthis hydrogen flow rate?

For each of the following vector fields FF, decide whether it is conservative or not by computing curl FF. Type in a potential function ff (that is, ∇f=F∇f=F). Assume the potential function has a value of zero at the origin. If the vector field is not conservative, type N.

F(x,y,z)=6xi+7yj+k
f(x,y,z)=f(x,y,z)=

equation editor

Equation Editor

D. F(x,y)=(6siny)i+(−6y+6xcosy)j
f(x,y)=