consider the IVP ( cos(x)sin(x) - xy^2)dx + (1-x^2)ydy = 0 , y(0) = 34

solve the IVP

answer))) 1156 = ???

What is the best mechanical pencil lead size (i.e. 0.5, 0.7 etc) and lead type (I.e. Hb etc) for engineering drawing (isometric and orthogonal) ?

Hydrolevel vs. ASME case study

What can engineering societies do to defend their goods once a conflict of interest is exposed?

Have ASME's reviewed conflict-of-interest procedures addressed the difficulties fully? Why or why not?

Hydrolevel vs. ASME case study

How could McDonnell and Miller, Inc. have evaded the conflict of interest?  

Determine the resultant vector D when the three vectors below are added together. Express your result in a magnitude and direction.
A = 5kN@40*
B = 10kN@140*
C = 25kN@240*

what do you know about Schlumberger and their career?

why Schlumberger?

which of these methods can strengthen copolymers 1. Strain hardening (cold working) 2. Alloying 3. Annealing 4. Reduce grain size

In large buildings, hot water in a water tank is circulated through a loop so that the user doesn’t have to wait for all the water in long piping to drain before hot water starts coming out. A certain recirculating loop involves 300-foot-long, 1-inch--diameter PEX pipes with six 90° threaded smooth bends and two fully open gate valves. The PEX piping is considered to be smooth (roughness is 0). If the average flow velocity through the loop is 5 ft/s, determine the pump power needed to overcome the loss in watts to three significant figures. Take the average water temperature to be 180 F (values for water in the text appendix).

The following readings were recorded during a tensile test of a mild steel specimen 24mm, wide by 10 mm thick and with gauge length of 200 mm.

Force (KN)= 16 32 48 64 68 72 76 79
Elongation =0.066 0.133 0.198 0.264 0.281 0.304 0.355 1.125

Force (KN) =76.8 83.7 103.8 111 112.8 108 96
Elongation = 3.75 6.66 15.00 25.00 36.5 45.0 50.0

The test piece fractured at a 50 mm elongation. Plot a load-extension diagram using the following scales : 10 Divisions on the x-axis = 5mm extension; 10 Divisions on the y-axis.

On the same graph paper using the scale 10 Divisions on x-axis = 0.5 mm extension, and 10 Divisions on the y-axis = 10 know, replot the elastic portion of the graph.
Using the graph, determine the following :
1.Modulus strength
2.Yield strength
3 ultimate tensile strength
4.percentage elongation

Question 1) As water passes from a pipe of larger diameter to a pipe of smaller diameter in converging section, the static pressure:

Becomes half

Increases

Decreases

Does not change

Question 2) The following reading have to be recorded from the flow measurement apparatus to calculate the mass flow rate from the venturimeter?

Pressures at the inlet and exit of the venturimeter

Pressures at the inlet and throat of the venturimeter

The rotameter reading venturimeter

The pressure at the throat and exit of the venturimeter

Question 3) If the flow rate of water increases, then the pressure drop in the venturimeter

increases

decreases

remains same

cannot say

Question 4) The pressure measuring instrument can directly provide electrical signals which could be used to collect data using data acquisition systems and read on a PC

Bourdon Gauge

inclined manometer

Pressure Transducer

Vertical manometer

Question 5) How do you vary the flow rate through the fluid fow measurement experimental setup?

by increasing or decreasing the amount of water coliected in the weighing tank

by increasing or decreasing the time taken to collect the amount of water in the weighing tank

by varying the speed of the pump

by closing or opening the valve at the discharge section of the apparatus

Question 6) In the flow measurement experiment, consider using the weighing tank method for measuring the flowrate. If a 6 kg mass is added to the weight hanger and it takes 60 seconds for the weight hanger to move up again, how much will be the calculated flow rate? (show steps please)

1 kg/s

3 kg/s

0.3 kg/s

0.1 kg/s

Problem 3.4 Part A

1 point possible (graded)

An isotropic alloy contains 5% by volume of a precipitate of radius 10nm. Assume the primary metal is in a simple cubic arrangement. The alloy has a Young's modulus E=70GPa and a Poisson's ratio ν=0.35. If Γ=0.9J/m2 (the energy needed to cut through the precipitate lattice per unit surface area), and b=0.25nm, what is the precipitate spacing L in the alloy?

L (in nm):

  unanswered

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Problem 3.4 Part B

1 point possible (graded)

What is the shear stress required to move a dislocation past the precipitates?

τp (in MPa):

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Problem 3.4 Part C

1 point possible (graded)

Instead of introducing a precipitate into the primary metal, alumina, a dispersion compound is introduced.

Consider the dislocation shown below, which bows to a radius of curvature R at an angle θ between two particles a distance L apart. Use the expression for line tension in a dislocation, the geometry of the bowing dislocation, and the force resulting from the applied shear stress to obtain an expression relating the applied shear stress and dislocation radius R. Express your answer in terms of the shear modulus G, the Burgers vector b, and the dislocation radius R.

(Hint: Draw the free body diagram for one of the particles. The force exerted by the stress on the dislocation is F=τbL)

τ=  unanswered

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Problem 3.4 Part D

1 point possible (graded)

Based on your expression in Part C, what is the angle beyond which no additional applied stress is needed to move the dislocation past the particles? (In other words, at what angle does the maximum applied shear stress occur?

θ (in degrees):

  unanswered