Given the vector current density J = (10rho2z)arho − (4rho cos2φ)aφ mA/m2 :

a. Find the current density at P (rho = 2, φ = 60◦ , z = 3);
b. Determine the total current flowing outward through the circular band rho = 4, π < φ < 2π ,
3 < z < 8.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.

What is the main objective of using reheat rankine cycle?