Consider a two-dimensional flow field described by a potential function v=c+ dr? - ey? where constant c=4m2.s-1, d=3s-1, e=3s-1 and x and y are the horizontal and vertical position coordinates, respectively measured in meters.

a) derive the stream function (\psi) for this flow field.

b) plot streamlines for three iso-values of \psi=1,2,3. from these iso-streamlines, comment on how velocity in this flow field changes with x, y positions.

c)determine pressure gradient at point (1, 1) located within the field if the fluid is assumed to be water. (hint: include effect of gravity acceleration which is 9.81 m. s-2. density of water can be assumed to be 998.2 kg/m3).

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

i'm pretty sure it is letter c.) car