For the following potential distribution, use the gradient equation to find E. V = r2sin Φ(V)

Select one:
a. -2.ρ.sinΦ.aρ - ρ.cosΦ.aΦ
b. None of these
c. -2.sinΦ.aρ - ρ.cosΦ.aΦ
d. -2.ρ.sinΦ.aρ - cosΦ.aΦ
fastt plz im running out of time

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.

What is creep? what is stress relaxation?