Fall 2019

Maximum Marks: 15

Due Date: November 19, 2019

INSTRUCTIONS

Please read the following instructions before attempting the solution of this assignment:

• To solve this assignment, you should have good command over lecture # 01-11

• Try to get the concepts, consolidate your concepts and ideas from these questions which you learn in these lectures. You should concern the recommended books for clarification of concepts.

• Upload assignments properly through LMS. No Assignment will be accepted through email.

• Write your ID on the top of your solution file.

• Do not use colored backgrounds in your solution files.

• Use Math Type or Equation Editor etc. for mathematical symbols and equations.

• You should remember that if we found the solution files of some students are same then we will reward zero marks to all those students. Therefore, try to make solution by yourself and protect your work from other students, otherwise you and the student who send same solution file as you will be given zero marks.

• Avoid copying the solution from book (or internet); you must solve the assignment yourself.

• Also remember that you are supposed to submit your assignment in Word format any other like scan images, HTML etc. will not be accepted and we will give zero marks correspond to these assignments.

Question: 1 Marks: 5

Following are some applications of either from fluid statics or fluid dynamics .Complete the table writing the appropriate field against each.

Application | Fluid dynamics / Fluid statics |
---|---|

Basketball floating on bath tub of water | |

Air over the surface of an automobile | |

Circulation of blood | |

Measuring of blood pressure | |

Mass transfer in oil pipelines |

Question2 Marks: 10

A 3kg plastic tank that has a volume of 0.2m3 is filled with liquid water. Assuming the density of water is 1000kgm-3determine the weight of combine system.

]]>Fall 2019

Maximum Marks: 15

Due Date: November 19, 2019

INSTRUCTIONS

Please read the following instructions before attempting the solution of this assignment:

• To solve this assignment, you should have good command over lecture # 01-11

• Try to get the concepts, consolidate your concepts and ideas from these questions which you learn in these lectures. You should concern the recommended books for clarification of concepts.

• Upload assignments properly through LMS. No Assignment will be accepted through email.

• Write your ID on the top of your solution file.

• Do not use colored backgrounds in your solution files.

• Use Math Type or Equation Editor etc. for mathematical symbols and equations.

• You should remember that if we found the solution files of some students are same then we will reward zero marks to all those students. Therefore, try to make solution by yourself and protect your work from other students, otherwise you and the student who send same solution file as you will be given zero marks.

• Avoid copying the solution from book (or internet); you must solve the assignment yourself.

• Also remember that you are supposed to submit your assignment in Word format any other like scan images, HTML etc. will not be accepted and we will give zero marks correspond to these assignments.

Question: 1 Marks: 5

Following are some applications of either from fluid statics or fluid dynamics .Complete the table writing the appropriate field against each.

Application | Fluid dynamics / Fluid statics |
---|---|

Basketball floating on bath tub of water | |

Air over the surface of an automobile | |

Circulation of blood | |

Measuring of blood pressure | |

Mass transfer in oil pipelines |

Question2 Marks: 10

A 3kg plastic tank that has a volume of 0.2m3 is filled with liquid water. Assuming the density of water is 1000kgm-3determine the weight of combine system.

]]>A 3kg plastic tank that has a volume of 0.2m3 is filled with liquid water. Assuming the density of water is 1000kgm-3determine the weight of combine system.

We know that the density of water is 1000 kg/m2\text{m}^2m2. We can use the following equation to figure out the weight of the combined system.

m=ρVm=\rho Vm=ρV

(Where m is mass, ρ\rhoρ is density, and V is volume)

Substitute the values we know:

m=ρVm=\rho Vm=ρV

m=(1000)(0.2)m=(1000)(0.2)m=(1000)(0.2)

m=200m=200m=200 kg

The combined mass is the mass of the tank plus the water.

mtotal=3+200m_{total}=3+200mtotal=3+200

mtotal=203m_{total}=203mtotal=203 kg

The weight can then be calculated using the following equation:

W=mgW=mgW=mg

(Where W is weight, m is mass and g is force of gravity)

Substitute the values we know:

W=mgW=mgW=mg

W=(203)(9.81)W=(203)(9.81)W=(203)(9.81)

W=1991.43W=1991.43W=1991.43 N

Final Answer:

W=1991.43W=1991.43W=1991.43 N

Question: 1 Marks: 5

Following are some applications of either from fluid statics or fluid dynamics .Complete the table writing the appropriate field against each.Application

Fluid dynamics / Fluid staticsBasketball floating on bath tub of water

Air over the surface of an automobile

Circulation of blood

Measuring of blood pressure

Mass transfer in oil pipelines

**Solution:**

The fluid mechanics is defined as the science that deals with the behavior of fluids at rest (fluid statics) or in motion (fluid dynamics), and the interaction of fluids with solids or other fluids at the boundaries.

Fluid statics is all about pressure. Here are the rules;

- Pressure at any point in a fluid is the same in all directions and is transmitted through static fluids without loss (Pascal’s principle)
- From 1, the pressure at the wall of any vessel is perpendicular to the wall
- Pressure due to depth is P = ρgh, and is the same at any horizontal level of connected fluid.
- The weight of a buoyant object is equal to the weight of the displaced liquid (Archemedes)

The foundational axioms of fluid dynamics are the conservation laws, specifically, conservation of mass, conservation of linear momentum, and conservation of energy (also known as First Law of Thermodynamics). They are expressed using the Reynolds transport theorem. In addition to the above, fluids are assumed to obey the continuum assumption. Fluids are composed of molecules that collide with one another and solid objects. However, the continuum assumption assumes that fluids are continuous, rather than discrete. Consequently, it is assumed that properties such as density, pressure, temperature, and flow velocity are well-defined at infinitesimally small points in space and vary continuously from one point to another. The fact that the fluid is made up of discrete molecules is ignored.

Application | Fluid dynamics / Fluid statics |
---|---|

Basketball floating on bath tub of water | Fluid statics |

Air over the surface of an automobile | Fluid dynamic |

Circulation of blood | Fluid dynamic |

Measuring of blood pressure | Fluid static |

Mass transfer in oil pipelines | Fluid dynamic |

Question2 Marks: 10

A 3kg plastic tank that has a volume of 0.2m3 is filled with liquid water. Assuming the density of water is 1000kgm-3determine the weight of combine system.

**Solution:**

Assumption The density of water is constant throughout.

mwater= ρV=(1000 kgm-3)( 0.2 m3)=200kg 3 Marks

mtotal= mwater + mtank=200kg + 3kg = 203kg 3 Marks

W=mg=(203 kg)(9.81ms-2)=1991.40N ≈ 1990N (up to 3 significant digits) 4 Marks