Thermal properties

A bar has an initial length of 100 mm at room temperature of 27oC. The tensile test indicates that the bar yields when it reaches is the stress level of 145 MPa and the strain value of 2.071 x 10-3. The bar is later placed in an oven and heated from room temperature to 100 oC. The linear coefficient of thermal expansion of the material is 23 x 10-6 oC-1 at 27oC, and 34 x 10-6 oC-1 at 527oC. Determine:

a. What is the linear coefficient of thermal expansion at 100 oC?

b. What is the length of the bar in millimeter at 100 oC?

c. Does the heating from room temperature to 100 oC the cause the bar to yield

Calculate the torque M which the engine of the pickup truck must supply to the rear axle to roll the front wheels over the curbing from a rest position if the rear wheels do not slip.
Determine the minimum effective coefficient of friction at the rear wheels to prevent slipping. The mass of the loaded truck with mass center at G is 1900 kg.

Calculate the torque M which the engine of the pickup truck must supply to the rear axle to roll the front wheels over the curbing from a rest position if the rear wheels do not slip.
Determine the minimum effective coefficient of friction at the rear wheels to prevent slipping. The mass of the loaded truck with mass center at G is 1900 kg.

Describe one application where a biodegradable polymer has been used, and contrast this to an application where a biostable polymer has been used. Your answer should be a comprehensive account of each application, with diagrams if appropriate, with a specific focus on the characteristics, of the relevant polymer category, that make them suitable for the application. (Maximum 750 words )

A drunk man walking simulation
A drunk man stands at origin. There is a cliff at x=10 and home at x=-10. He takes steps randomly left and right. Each step has the probability p of going left and q=1−p of going right.
We desire to simulate and plot 100 random trajectories for the interval of 100 time instants. Once hit at home or cliff, a trajectory is stopped immediately and success or dead is declared. Otherwise, alive is declared. Obtain histograms of [success, dead, alive] for p=0.25, 0.5, and 0.75.

alive = 0
success = 0
dead = 0
p = 0.5
for (n in 1:1000)
{
i = 0
s = 0
while (s < 10 && s > -10 && i < 100)
{
x = rbinom(1, 1, p)
if(x == 1)
s = s-1
else
s = s+1
i = i+1
}
if(s == 0)
alive = alive +1
if(s == 10)
success = success + 1
if(s == -10)
dead = dead + 1
}
barplot(c(success, dead, alive))

this code not working

i need histogram and trajectories and code of mathlab

Explain the equations of
1) coherency hardening
2) modulus effect
3) stacking fault energy
4) order hardening
5) surface hardening of PRECIPITATION HARDENING. (Advanced mechanical behavior of materials)

pls do answer correctly!

One of the major problems that railway industries have faced since the earliest days is the prevention of service failures in running rail. As is the case will all modes of high-speed travel, failures of an essential component can have serious consequences. Rail is manufactured in different weights and conditions, and therefore, there are pursued a significant number of potential defects. In order to overcome the failure to occur during operating, a special predictive tool needs to be implemented to make sure the rail is safe and operating in normal condition. Thus, the objective of this project is to enhance the predictive monitoring assessment system for the railway running rail by estimating the fracture damage behaviour of the rail structure. The fibre optics will be used as a sensor device to measure the signal of the strain-stress in running rail. Suggest the steps or procedures that need to be carried out to measure the strain-stress signal in the railway running rail. Is that any possible errors that might be existing while capturing the data?

Identify each of the following as either true or false regarding the professional responsibilities of a design engineer.

1. a) Your main responsibility is to satisfy the needs of your employer in a competent and

   professional manner.

2. b) You need to keep good documentation only for important projects or when you have time.

3. c) You need to be familiar with current industry trends, standards, and codes.

4. d) You should be versed in professional ethics.

Imagine the CEO of a software house asks you to make a system that automates the SDLC
process. Based on the initial requirements, you were successfully able to make a prototype that
captures almost 40$-50% functionalities. You presented the demo to the CEO and now CEO is very
impressed with the work. The CEO has ordered you to add some new features in the prototype and
release the product as soon as possible. Being the lead developer of the project, do you think this is a
good idea? If yes, provide your reason? If no, write a reasoning report for the CEO to explain why it is
not a good idea to add more features in the prototype and put it in the release.

MAKE A PROCESS FLOW CHART :

PROCEDURE:
Pattern Making

1. Using try square check the perpendicularity of the wood
2. Using try square and steel ruler check the dimension of the wood if it is suitable for our

design if not either replace the wood if it is less than to the required dimension as specified

in our drawing if it is greater using rip cut saw reduce the wood to its suitable size

3. Divide the wood into two (2) parts using following procedure (either)

a. Create two diagonal lines, the intersection points of the two diagonal lines represents the center of the wood then marked the center and draw a lines (represent as pt P)

b. Measure 60 mm from left side then marked the point at 60 mm and draw a lines (represent as pt P)

4. Using rip cut saw cut the wood into two (2) piece, cut location is in step # 3
5. Overlap the two (2) piece wood then around the side of the wood, tape the wood using

masking tape for temporary joining of the material

6. From the top side of the wood create two (2) diagonal lines
7. Get the center of step # 6 from the center create a point going down by 10 mm (represent

as pt O)

8. From pt O using compass create an arc with a radius of 10 mm
9. From the center using a compass create an arc with a radius of 38 mm
10. From the top right side of the wood from the edge measure 28 mm
11. From the lower left side of the from the edge measure 28 mm
12. Connect the arc and step # 10 and step # 11 to create the outline of the elbow
13. From top right side of the wood measure 14 mm then offset going inside by 15 mm marked

it using a pencil it represents as the bamboo pin location 1

14. From lower left side of the wood measure 14 mm then offset going inside by 15 mm marked it using a pencil it represents as the bamboo pin location 2
15. Using drill make a hole for step # 13 and step # 14
16. For the drill bit use 1/8” diameter then measure 22 mm depth of the drill bit then marked it

using masking tape it represents as the limits/depth of the bamboo pin for our pattern

17. Remove the masking tape around the wood
18. Then placed the bamboo pin to its location

Base

1. Secure the wood piece in the bench vise
2. Using compass draw a circle at the side of the wood piece, the circle shall be connected to

the step 10 and step 11 of pattern making

3. Using rip cut saw remove the part of the wood outside the outline
4. Then to shape up the wood into elbow using set of files such as rasp file, small file and

triangular file form the elbow makes sure throughout the wood it should have 28 mm in

diameter

5. Using sandpaper clean the surface of the base

Core Prints

1. Using the other wood create the core prints 1 and 2 (CP 1 and CP 2); using compass draw the circle with a diameter equivalent to 32 mm and 28 mm.
2. Using rip cut saw cut the core prints (CP1 and CP2)
3. Using set of file form, the circle of the core prints
4. Using set of sandpaper clean the main body and core prints (CP1 and CP2)
5. Using wood glue attach the core prints to the main body with following arrangement as shown in drawing

write a fortran code on helical transcritical compression tube used in pulse tube cryocooler using R407 refrigerant.

it is different than already replied question on chegg. please dont copy paste that answer i want genuine and correct code using fortran 77 only

Please make sure to display your thought process? It is imperative to be able to follow how the answer was deduced. Please be as thorough as possible. Please address all parts of this question as they are all part and critical to answering this question correctly. Please show good integrity when answering the question:

1) A sample of cross-linked natural rubber (polyisoprene) is found to have a shear modulus of 500 kPa at 25˚C. Determine the force needed to stretch a 100 mm long rod to 150 mm. Note that the original circular cross-section of the rod was 1.0 mm in diameter. What is the diameter of this rod of natural rubber while stretched to 150 mm?

USE EXCEL OR MATLAB IF YOU NEED

Given the dry-bulb temperature, T_db and relative humidity, Φ, the wet-bulb, T_wb temperature may be calculated from the psychrometric equation (Jones, 1994):

P_vsΦ – P_ss = P_atmA (T_wb -T_db )                                              (1)

Use your input from the Table below.

The input T_wb and T_db are in ^oC (used in Eqs. (2) and (3) in Kelvin).   

P_ss = saturated vapor pressure at T_wb (kPa)

P_vs = saturated vapor pressure at T_db (kPa)   

P_ss = 10^[30.59051- 8.2 log₁₀ T_wb + 0.0024804 T_wb – 3142.31/ T_wb] ..........(2)

and

P_vs = 10^[30.59051- 8.2 log₁₀ T_db + 0.0024804 T_db – 3142.31/ T_db]     ........(3)

In the above two equations T is in Kelvin and P in kPa (you have to convert the temperatures from the input in ^oC to Kelvin).

P_atm= atmospheric pressure (kPa) (P_atm =101.325 kPa)

T_db = dry-bulb temperature (^oC)

T_wb = wet-bulb temperature (^oC)

A    = 6.66x10^-4 C^-1 (constant for sling psychrometer)

Φ = relative humidity (%) used in the calculations as (%/100). For example, for 80% relative humidity, input 0.8.

Solve Equation (1) for the wet-bulb temperature using Newton-Raphson method. The input is as follows: T_db= in ^oC and Φ= in % (to be converted in the program to fraction, i.e., Φ=50% means Φ=0.5). Set the tolerance to 10^-4 . In other words, the absolute difference between the results of two successive iterations should not be more than 10^-4. Check your answer using Psychrometric chart/Thermo Textbook. Also, to check if your results are correct, use f=100% and you should get T_wb=T_db. S is yourlisting number.

Explain the difference between parabolic dish and trough by drawing both the schematics, Discuss which one is better and why?

Neat and clean schematic diagram of both.

1. Suppose there a joint where 13 bolts (M14 x 2, ISO 9.8) are on a 200 mm bolt circle. The bolts are zinc-plated and installed for permanent installation. The maximum total load is 400,000 N and the minimum load is 100,000 N. The top member of the joint is cast-iron (E = 100,000 MPa) and 20 mm thick, while the bottom member is steel that is 40 mm thick.

e) What is the factor of safety in yield, np?

f) What is the load factor of safety, nL?

g) What is the joint separation factor of safety, nO?

h) What is the fatigue factor of safety, nf?

i) Is this joint safe in both static and fatigue loading?

j) What is the torque required to make up the bolts to the required pre-load, in N-mm?