bending moment of 4 kN m is found to cause elastic failure of a solid circular shaft. An exactly similar shaft is now subjected to a torque T. Determine the value of T which will cause failure of the shaft according to the following theories:
(a) Maximum principal stress;
(b) Maximum principal strain;
(c) Maximum shear strain energy. ?= 0.3.)
Which of these values would you expect to be the most reliable and why?

A horizontal shaft of 75mm diameter projects from a bearing and, in addition to the torque transmitted, the shaft carries a vertical load of 8 kN at 300 mm from the bearing. If the safe stress for the material, as determined in a simple tension test, is 135 MN/m2 find the safe torque to which the shaft may be subjected using as a criterion
(a) The maximum shearing, stress,
(b) The maximum strain energy per unit volume.
Poisson’s ratio ? = 0.29.

Describe the common characteristics and mechanical properties associated with aluminum.

A nuclear power plant is planned to be constructed near Sydney. The plant is required to have an installed capacity of 1200 MW and will be operated for 7500 hours per year. Consider providing 1200 MW of energy by two solar power plants; one in Sydney and the other in Canberra. It is required that a fixed solar module be mounted. Determine the following parameters if the overall efficiency of the module is given as 15%:

a) The peak power of the solar generator at each site.
b) The total solar generator area for each site.
c) The amount of land area required at each site.
d) Discuss any technical, environmental, operational and financial implications of using solar power modules at the two sites.

Why is the moment at leading edge(LE)=-c/4 times lift + moment at c/4=-position of center of pressure times lift? The equation shows like this MLE=-c/4*L+Mc/4=-xp*L. Because moment of leading edge and moment at center of pressure or moment at c/4 they always act on the wing but why they equal to each other but not like sum them up? Also, what is neutral point? Is neutral point always change in different situations like flying with different angle of attack? And why the derivative of moment at c/4 of time(d(Mc/4)/dt)=0? Is it because moment at c/4 always constant? Thank you so much

what will be the impact towards society, health,safety and environment if the engineer used diameter of discharge line more than the minimum diameter?

In a pharmaceutical application distilled water with a flow rate of 34560 kg/hr is to cool ethyl alcohol in a parallel flow heat exchanger. The alcohol flowing at 31320 kg/hr enters the exchanger at 75oC and is cooled to 45oC. Assuming that the water flows through the tubes and enters the exchanger at 15oC, determine, for an overall heat transfer coefficient of 0.5kW/m2K the dissipation rate, together with the required heat transfer area. The specific heat capacity of both the alcohol and water is 3.84 and 4.181kJ/kgK

a)

What are the two important physical quantities that characterize wetting and liquid repellency of a

solid surface? Name them, and explain the difference between these two quantities

b)

Peter is playing around with four different solid surfaces (labelled as A, B, C, and D) by placing

different types of liquids onto these surfaces. Peter found something very puzzling: When he

placed small drops of water and oils onto Surface

A, all of these liquids stick to the surfaces.

However, when he placed water and oils droplets onto Surface B, only water can roll off the

surface but oils remain stuck to the surface. Peter

also

found that both water and oils droplets are

highly mobile o

n Surface C, and can be rolled off from the surface. Finally, when Peter placed

both water and oils droplets onto Surface D,

oil droplets are highly mobile but the water droplets

appear to spread completely on the surface. Please provide possible

physical

explanations to all

the above scenarios. Please remember to include schematics and important physical quantities in

your explanations

Describe the procedure to determine the first modal damping. Outline the key steps and sketch the collected acceleration data.

The planet Mars has a diameter of 6772 km, and it orbits the sun at a distance of 227.9 x 10^6 km. If the sun is assumed to radiate like a blackbody at 5760 K, and Mars has an albedo of 0.15 ( reflects 15% of incident radiation back to space), estimate the average temperature of the Martian surface. Ignore the effects of the thin Martian atmosphere.

At steady state, 100 m^3/min of dry air at 32 C, 1 bar is mixed adiabatically with a stream of oxygen at 127 C, 1 bar to form a mixed stream at 47 C, 1 bar. Kinetic and potential energy effects can be ignored.

Find:

(a) the mass flow rates of the dry air and the oxygen

(b) the mole fractions of the dry air and oxygen in the exiting mixture

(c) the time rate of entropy production

Argon gas is initially at a pressure of 10 bar and temperature of 45oC (state 1), while occupying a volume of 0.8 m3 in a frictionless piston-cylinder arrangement. The gas then undergoes a reversible constant volume process to a pressure of 6 bar (state 2), followed by a constant pressure process in which the temperature is restored to 45oC (state 3). a) Sketch the processes on T-s and p-v diagrams b) Assuming perfect gas behaviour determine i) The work done by each process. ii) The heat transfer during each process. iii) The change in entropy in process state 3 to 1. (For Argon take Cp = 519.6 J.kg^-1K^-1 and relative molar mass M=40

compressible flow:

a converging-diverging nozzle has an area ratio of 5 and a stagnation pressure of 1 MPa. Assume that the gas in the nozzle behaves exactly like air. Which of the following most accurately gives the range of nozzle exit pressures for which the flow is choked, but has subsonic flow at the nozzle exit?

a)990 kPa ?? 1 MPa
b)244 kPa ?? 1 MPa
c)21 kPa ?? 1MPa
d)1 kPa ?? 1 MPa
e)244 kPa ?? 990 kPa
f)21 kPa ?? 990 kPa
g)1 kPa ?? 990 kPa
h)21 kPa ?? 244 kPa
i)1 kPa ?? 244 kPa
j)1 kPa ?? 21 kPa

in c++ (Sum, average and product of numbers in a file) Suppose that a text file Exercise13_3.txt contains six integers. Write a program that reads integers from the file and displays their sum, average and product. Integers are separated by blanks.

Instead of displaying the results on the screen, send the results to an output named using your last name.

Example:

      Contents of Exercise13_3.txt:

      Contents of YourLastName.txt:

Run the program for the example above and for another example with 15 scores.