Need it fast, Mechanical Engineering

Assignment Help:
PROBLEM 1 (30 points)
Consider a Boeing 747-400 at weight close to the maximum takeo? weight (MTOW) cruising at
Mach 0.82 at an altitude of 32000 ft.
(a) How much thrust is needed to maintain cruise? Express your answer in kN and as a fraction of
the weight.
(b) What is the diameter of a sphere that would have the same drag as the Boeing 747-400 at the
same cruise conditions? How does the sphere diameter compare to the wing span of the 747?
PROBLEM 2 (30 points)
D
Shear stress t
Blood cells sustain serious damage (hemolysis) when they are subjected to shear stress exceeding
150 Pa. During blood transfusion, blood ?ows through a syringe needle with typical inner diameter
D= 0.603 mm. See chart at http//en.wikipedia.org/wiki/Needle_gauge_comparison_chart.
It’s the 20-gauge needle). The intent is to transfuse blood as quickly as possible without damaging
the cells.
The ?ow ?eld inside the syringe needle is well approximated by Poiseuille’s law (you can look it up
in the book), which can be worked out to give the following relation between the volume ?ow rate
Q and the wall shear stress t (the wall stress is the maximum stress):
Q =
1
32
pD3
µ
t
Here µ is the viscosity of the blood. Your task is to recommend to the administering doctor the
maximum permissible blood ?ow rate. Do your calculations in SI units, then convert your ?nal
answer to L/min (liters per minute, a unit that doctors understand...).
For the average human, how long will it take to replace their entire blood volume?
1

Related Discussions:- Need it fast

What is called materials which can store electrical energy, Materials which...

Materials which can store electrical energy are called (A) magnetic materials.  (B) semi conductors. (C) dielectric materials.  (D) super conductors. Ans: Mater

Example of equilibrium of body on the rough inclined, Example of Equilibriu...

Example of Equilibrium of body on the rough inclined: Magnitude of minimum force ' p ' that is required to move the body up the plane. At the time when ' p ' is acted with the

Crankshaft-basic components of engine , Crankshaft : It converts the recip...

Crankshaft : It converts the reciprocating motion of the piston into useful rotary motion. In the crankshaft of a single cylinder engine, there is a pair of crank arms and balance

Determine the reactions at beam, Determine the reactions at bea: A can...

Determine the reactions at bea: A cantilever AB, 1.8 m long is fixed at A and carries uniformly distributed load of 20 kN/m over its entire length and a point load of 30 kN at

Material requisition for quotation procedure, The Mechanical Design Enginee...

The Mechanical Design Engineer/Specialist shall be responsible for mechanical design calculations that are required to ensure that the end product complies with all applicable code

Calculate the normal force, Problem You are playing tetherball because ...

Problem You are playing tetherball because you are seven years old and you have nothing better to do.  If the tetherball has a mass of 1 kg and the rope is 1.5 m long and can w

Determine the edge table, Determine the Edge Table Each entry in the ed...

Determine the Edge Table Each entry in the edge table contains those information mentioned earlier, edge name, start vertex and end vertex, left face and right face, the predec

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd