Lab03 Practice (2)

Mechanical Engineering The fatigue strength limit Sn (n = 106) of a steel part is 112 MPa and its ultimate tensile strength (Sy) is 385MPa. Adopting Ct = 1, and S103 = 0.9 * Su* Ct, determine: (Use two decimal places in the answers), (* is multiplication signal): a) The fatigue strength (in MPa) corresponding to a life of 40000 cycles. b) The average life in cycles that this part would last if subjected to an alternating stress of 170 MPa due to bending.

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Please answer all subparts aligned with our honor code.

1- Select the optimum choice for: high speed air craft skins material. Table 1: The properties of metallic materials E, GPa Max. use lemp, 'C | Density, Mg/cm' ay, MPa | Relative cost per unit sheet area Material 2.8 300 2 Aluminum alloy 200 69 200 7,8 350 350 700 Carbon steel Stainless steel 193 7.8 650 6 8.9 600 6 Nickel alloy Titanium alloy 207 1000 116 600 4.5 900 10 Table 2: Weighting factor Specific yield strength: Max, use temperature: Youngs modulus: 4 2

QUESTION 3 A Type I offshore life jacket (i.e. personal flotation device) is the type worn by commercial fishermen - it is designed for extended survival in rough, open seawater. Consider such a life jacket that uses an impermeable foam material with a density of 32 kg/m³ - the other parts of the life jacket (straps, fasteners, etc) weigh 0.6 kg and are of negligible volume to the design. a) Draw a free body force diagram for the life jacket. b) Determine the minimum volume of foam material (in L) that is needed for the life jacket in order to provide a minimum 98 N net upward force when it is fully submerged in seawater (as required by US Coast Guard regulations).

Can someone please help me to correctly solve all the following parts of this question. Thank you!

Three of the following statements are true, but one is false. Indicate which one is false. A) There is no critical thickness of insulation for a flat surface (plane wall). B) Insulation my increase or decrease the heat transfer from a pipe or a sphere. C) In a cylindrical pipe or a spherical shell, the additional insulation increases the conduction resistance of the insulation layer but decreases the convection resistance of the surface. D) Small bodies with high thermal conductivities and low convection coefficients are less likely to satisfy the criterion for lumped system analysis.

Steel crane rails of the MRT are laid with their adjacent ends 3.2 m apart when the temperature is 15 °C. The length of each rail is 18 m. The coefficient of thermal expansion is 11.7 x 10-6 m/m.ºC. Use E= 200 GPa. a) Determine the temperature at which the rails will touch end to end. b) Determine the gap between adjacent ends when the temperature drops to -10°C. c) Determine the compressive stress in the rails when the temperature reaches 45 °C.

Q#01: Write a short note on the following: a) What are the best possible solutions to increase the heat transfer rate of a body? b) Which material will transfer more heat? Either a material with thermal conductivity k = 121"/mec or k= 22.WLmog: Justify your answer. m°C c) Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate? d) Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer. i. Flat plate. ii. Circular/pin fins. iii. Triangular fins.

Enumerate and name the fittings you can find base on the figure. Use table to organize your answer.

Pls.answer thank you! A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5 KW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 KJ/hr. There are 10 light bulbs in the room, each with a rating of 100 watts. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 KJ/hr. If the room air is to be maintained at a constant temperature of 21°C, determine the number of window air-conditioning units required.

Question 44 For a given element in a circuit, current through it was measured to be a constant 4.0 A. If the circuit was on for 1.5 minutes, and the voltage across the same element was measured to be 8 V. What was the total energy dissipated by the element? O 32.0 ki 1.92 k Not enough information given 48.0J 2.88 k)

Solve correctly please. (Gpt/Ai wrong ans not allowed)

I need help with the second table. and these questions   1- If 1 gallon of oil = 1.4 therm, how many gallons have been wasted by heat loss in Feb? (1 therm = 100,000 BTU)   2- If $1.30 per therm, how much did you waste from house heat loss in Feb?

Energy and system size calculation TEQ assessment (4.1) Design a question to calculate the cooling load for the building you selected for You will define at least FOUR types of heat gain in that building (or the floor you are working on or you are familiar with). The indoor temperature is set as 75 F, and you can assume the outdoor temperature based on the location of your building in the summer and any other numbers needed to resolve this question. (4.2) Calculate the corresponding cooling load for the question you designed above. For all the details as well as the final answer that this question is asking for, clearly indicate the unit for each piece of information. In a word, you will design a question for your building about cooling load calculation. Assumptions and/or supporting drawings/figures/tables are allowed and encouraged. You can decide the level of detail for this question, e.g., the more details and the more accurate information, the more accurate and realistic your…

Question #5 (Similar to Question #4, You solved, I have attached the question #4)Design a question to calculate the heating load for the building you selected indoor Environment Quality (IEQ) assessment. You will define the types of heat loss (at least two types) in that building (or the floor you are working on or you are familiar with). The indoor temperature is set as 75 F, and you can assume the outdoor temperature based on the location of your building in the winter and any other numbers needed to resolve this question. For all the details as well as the final answer that this question is asking for, clearly indicate the unit for each piece of information.

I need answers with clear hand writing or using Microsoft word . ASAP INFORMATION ON SOLAR THERMAL SYSTEMS

(24) States usually have their own building codes and state codes often require local building codes to be at least as strict as the state code. Select one: A. TRUE B. FALSE

Rank 1-4

Which of the following formulas describe the thermal efficiency of a cycle? Select all that applies.     1 - qin/qout     worknet/qout     worknet/qin     1 - qout/qin

MECT361 Mechatronics Components and Instrumentation Please solve the problem in keupord 0.Consider the Material Selection Design Problem for the FRAME of a Human Powered Road Vehicle. Define the selection criteria, assign weights (importance), and evaluate the following alternatives based on COST, WEIGHT, STRENGTH, AVAILABILITY, MANUFACTURABILITY, ASSEMBLY, TEST & MAINTENANCE, ENVIRONMENT & SUSTAINABILITY, SAFETY & RELIABILITY: a.Steel b.Aluminum c. Titanium d.Composite- CFRP

• Temperature plot scoped to steam pipe (cast iron) in C° units. Fill in the below table. Compute the temperature drop up to THREE decimal places (see hint given below). Temp drop in Insulator Temp drop in Pipe ANSYS Results • Include the above table in your submission.

Please include units

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Please could you help me to solve this question?

Answer in letter C

Which two of the following are best correct statements for the wall with the temperature distribution shown below: A) The heat flux would be constant at any location in the wall B) It is unclear if heat is being generated within the wall C) Heat does not flow across the centerline D) Everywhere inside the wall, heat flows only to the right( same direction as the x-direction E) If the convection outside the wall is occuring with a normal magnitude of h, then it can be expected that Ts >> Tinfinity

Please Use excel Shee t Note:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.

Subject: mechanical engi

Help me answer letter A.

materials resistance