Mechanics of Fluid – CE 411 Assignment CE 4B

Solve the following and submit their solutions next meeting. Answers are given at the end of each problem for your guide. Don’t forget to carry out the units and show its cancellations. Refer to your notes for a further guide.


  1. Determine the total kilograms that can be made by mixing 2 liters of alcohol and 2 liters of water. Assume the densities of alcohol and water are 0.78 and 0.98 respectively. Ans. 3.520 kgs
  1. Fluid A has a density of 600 kg/m3 is mixed with a liquid whose density is 1000 kg/m3 filling 1 m3 Find the respective quantities if the density of the mixture is 800kg/m3. Also, find the weight of the mixture if g = 9.8 m/sec2.

Ans.   A) m1 =  300 kgs, m2 = 500 kgs         b)         W = 800 kg f

  1. Four kilograms of air at 270K are contained in a 0.3 m3 tank. Determine     a) pressure, kPa, b) Number of moles, kg moles, c) specific volume, m3/kg, d) specific volume of mass in a molal basis, m3/kg mol

For air, R= 0.287 kJ/kgK,                   M= 28.97 kg/kg mol,   use PV =mRT


Ans.  A) P = 1033.2 kPa  b) N  = 0.138 kg mol, c) 0.075 m3/kg  d) 2.17 m3/kg mol

  4. Calculate how many stokes is kinematics viscosity of 2 ft / sec 2 ?

Ans.  v =   1859 stokes

  1. Oxygen is at 50oC and 150 KPa abs. Calculate (a) density, (b) specific weight  (c) specific volume.

MW of oxygen                       = 32

Universal gas constant            = 8312 N m/ kg mole K


R  = 8312 / 32  = 0.26 kN m / kg K

Ans:  (a ) density , p = 1.79 kg/m3, ( b ) Specific Weight        = 17.54 N / m3

( c ) Specific Volume , v = 0.559 m3 /kg


Dr. Victor E. Odarve, BSME/MEP-ME/MAED/EDD-Lecturer

University of Immaculate Conception, Davao City, Philippines