What is the basis of Reynolds Analogy? (what is analogous to what?)
In: Mechanical Engineering
What is components? What is phases? What is tie line?
In: Mechanical Engineering
Class 20 and class 60 gray cast irons have tensile strengths of
about 20 ksi and
60 ksi, respectively. Assuming that the fractures start from
graphite flakes and that
the flakes act as preexisting cracks, use the concepts of the
Griffith analysis to predict
the ratio of the average graphite flake sizes of the two cast
irons.
In: Mechanical Engineering
1. You want to design a pendulum for a grandfather clock so that it has a period of 2.00 seconds (so that one “tick” plus one “tock” occur during one complete period). The pendulum has a heavy 8.00-kg bob. (Throughout this problem, assume an ideal simple pendulum: the pendulum’s arm has negligible mass, the bob can be approximated as a point-mass, the initial angle of displacement is small, and there is negligible friction.)
a.) If you want the clock to be used on the surface of the Earth near sea level (where g = 9.80 m/s2 ), what length should you use for the pendulum arm? Show your work. (Note: How many significant figures should your final answer have? Watch your rounding!)
b.) Suppose that the temperature in the room gets much warmer, and the length of the pendulum’s arm expands by 2.50%. By what percentage will the pendulum’s period increase? Show your work. Express your final answer as either a decimal factor or a percentage (with appropriate sig. figs.).
c.) Which one or more of the following changes would (when considered separately and individually) increase the period of the pendulum, thereby making the clock run “slower”? Circle ALL that apply:
A. moving the pendulum to the top of a (fictitiously) high mountain where g = 9.70 m/s2
B. sticking some putty on the pendulum bob, thereby increasing its mass
C. decreasing the amplitude of the pendulum’s swings
In: Mechanical Engineering
An airplane weighing 5,000 lb is flying at standard sea level with a velocity of 550 mi/h. At this velocity, the L/D ratio is a maximum. The wing area and aspect ratio are 200 ft2 and 8.5, respectively. The Oswald efficiency factor is 0.93. Calculate the total drag on the airplane. Assume ?? = 0.002377 slug/ft3. (Round the final answer to one decimal place.)
The total drag on the airplane is _______lb.
In: Mechanical Engineering
Develop MATLAB codes for Blade Element Momentum Theory for horizontal axis tidal turbine for airfoil NACA 0015, analyzing the performance of the turbine; power.
In: Mechanical Engineering
In Systems Engineering, What is CM? What is Change Management? What are their similarities and what are the differences?
In: Mechanical Engineering
What is a refractory metal? What are some examples? What is a precious metal? What are some examples?
In: Mechanical Engineering
What is biomechanics? What is strain and stress? What is coefficient of damping? What is storage and loss modulus? What is sound pressure and sound intensity?
In: Mechanical Engineering
Show that, for places of latitude angle of l, the solar attitude angle at solar noon (when maximum solar radiation of the day is achieved) can be calculated by ? = 90 - ?l-?? where ? is the deflection angle of the day of consideration
In: Mechanical Engineering
1 – Calculate the adiabatic flame temperature of propane combustion with 50% excess air.
2– Use an online adiabatic flame calculator to calculate the adiabatic flame temperature of propane with air in increments of 0.1 equivalence ratio from 0.5 to 1.2. Plot your results and determine the point that the flame has the maximum T. Compare your results with that of Problem 1.
In: Mechanical Engineering
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and 300 K. A hole develops in the wall, and air from the surroundings at 1 bar, 300 K flows in until the pressure in the tank reaches 1 bar. Heat transfer between the contents of the tank and the surroundings is negligible. Determine the final temperature in the tank, in K. What is the entropy generation of the process? (Please treat the air as ideal gas with cp=1.001 kJ/kg?K and cv=0.714 kJ/kg?K)
In: Mechanical Engineering
True or False:
1. Keys are used to enable transmission of torque from the shaft to the shaft supported elements.
2. For the same bore diameter, a cylindrical roller bearing generally has a lower load carrying capacity than ball bearings.
3. Thrust bearings are suitable for supporting both axial and radial loads.
4. Typical bearing failures are due to excessive static stresses.
5. According to the seminar presentations, materials for joint replacements are selected on basis of the loading as well as their biocompatibility.
6. According to the seminar presentations, microturbine shafts are supported on air bearings?
In: Mechanical Engineering
a. Conduct an analysis for a gas turbine combustor using Propane, C3H8, you can assume the product outlet temperature is 1500 K and the air inlet temperature is 650 K on a standard day (25 C) and the fuel enters at ambient temperature.
In: Mechanical Engineering
How does the crystal structure influence friction? Why do FCC metals have more friction than HCP metals?
In: Mechanical Engineering