while servicing a pair of aluminum cylider heads:technecian a says if needed,both heads must be machined equally and the same amount of material removed from each.technecian b says replace bboth heads if warpage exceeds the specified allowable amount.who is correct?

determine the cutting speed and calculate spindle RPM for driiling a 1.5" diameter hole ins AISI-SAE 1020 steel with a brinell hardness of 125 to 175

A gas with cp = 0.950 kJ/kg-K enters an insulated nozzle at 30^oC and a velocity of 8 m/s. The gas exits at a velocity of 100 m/s. Assuming constant specific heats and ideal gas behavior, what is the exit temperature of the gas?

An alloy of magnesium and lead is 50% lead by weight. A) convert this alloy to an equivalent atomic percentage. B) Convert this alloy to an equivalent volume percentage

Complete exercise 9.20 from the text.

(a) Create a function called polygon that draws a polygon in a polar plot. Your function should have a single input parameter – the number of sides.

(b) Use a for loop to create a figure with four subplots…You should use the function you created in part (a) to draw each polygon. Use the index parameter from the for loop to specify the subplot in which each polygon is drawn, and in an expression to determine the number of sides used as input to the polygon fuction.

For help with the algorithm to draw regular polygons, consult problem 8.17 To be clear, the polygon() function should only draw one polygon, as specified by the number it receives as a parameter.

A second function or script should have the for loop, call subplot() to indicate where to create a plot, and call polygon() to actually create the plot.

Additional notes include:

1. There must be some weird junk on the internet because many previous students have tried to use some gibberish with rand() and cumsum() that does not create triangles, squares, etc. Do not repeat their mistakes.

2. Never clear variables at the start of a function!

3. A for loop with just one number is a waste of typed characters.

4. The instructions never mention prompting the user for a number.

5. You must call subplot before you plot anything that is supposed to go into a subplot.

6. Things that only need to be done once should not be inside a loop, such as set(gcf, …). The only things that should be inside a loop are the things that must be repeated.

7. If you copy and paste a few lines, especially more than once, there is probably a better way.

and here's what I did so far, it needs to be fixed according to note number 4 and additional corrections

%% 9.20 (a) create a function called polygon in a polar plot
function [p] = polygon(n)
n = input('Enter the number of sides: ');
theta = 0: 2*pi/n : 2*pi;
r = ones(1, length(theta));
subplot(2, 2, n-2); polar(theta, r);
end
% (b) use a for loop to create figure with four subplots
function polygon
for n = 3: 1: 6
polar(theta, r)
end

end

Thanks

Determine the force vs reduction in height curve in open-dye forging of a cylindrical, annealed copper specifmen 10mm high and 25mm in diameter, up to a reduction of 50% for the following cases:

a) no friction between the flat dies and the specimen

b) u=0.10

c) u=0.30

Ignore barreling and use average pressure formulas.

Then, calculate the work done and the temperature rise in the specimen for each case, assuming the process is adiabatic and and the temperature is uniform throughout the specimen.

Use the following values:

K=315KPa

n=0.54

Cp=380J/kgK

p(rho)= 8970k/m^3

Air flows through a pipe that has a length of 45 m with an inside diameter of 0.025 m. The Mach number of the flow exiting the pipe is 0.26, with a static pressure of 1 atmosphere and a temperature of 300 K. If the friction factor is assumed constant at 0.007, calculate the Mach number, static pressure, static temperature and total pressure at the entrance.

P2) Ethane in a rigid vessel is to be heated from 0.5MPa and 40 °C to 290 °C. Using the compressibility chart, determine the final pressure.

. You have two thermal couples. One thermal couple is fixed in space at (Xo,Yo,Zo) and the second thermal couple is moving in space. At time to, the second thermal couple moves to location (Xo,Yo,Zo). Assuming the temperature is not uniform in space.

Are the temperatures measured from the two thermal couples the same ?

Are the rate of changes of temperature the same?

Please be clear I really want to understand the concept, Thank you for your help (:

2. If produced by Method A, a product’s initial capital cost will be $100,000, its operating cost will be $20,000 per year, and its salvage value after 3 years will be $20,000. With Method B there is a first cost of $150,000, an operating cost of $10,000 per year, and a $50,0000 salvage value after its 3-year life. Based on a present worth analysis at a 15% interest rate, which method should be used?

2. If produced by Method A, a product’s initial capital cost will be $100,000, its operating cost will be $20,000 per year, and its salvage value after 3 years will be $20,000. With Method B there is a first cost of $150,000, an operating cost of $10,000 per year, and a $50,0000 salvage value after its 3-year life. Based on a present worth analysis at a 15% interest rate, which method should be used?

Estimate the heat loss rate from a person who can be approximated as a cylinder of diameter 0.3 m and height 1.8 m. The (clothing) surface temperature is 23 °C and the cross wind flow velocity is 15 m/s. The ambient temperature is –23 °C. Neglect end effects from the cylinder. Assume steady state.

Two sections of a pressure vessel are to be held together by 5/8 in-11 UNC grade 5 bolts. You are told that the length of the bolts is 1.5 in, the length of the threaded portion of the bolts is 0.75 in, and that their elastic modulus is E=30 Mpsi. The total load on the joint is 36 kip and the stiffness of the members is given as km=8.95 Mlbf/in. What is the minimum number of bolts that should be used to guard against excess proof strength with a factor of safety of np=1.2? Be sure to make an estimate for the preload.

A deli meats factory pumps a liquefied meat mixture through round plastic pipe that is 75mm inside diameter. Assume that the liquid meat mixture has a specific gravity of 0.9, a dynamic viscosity of 0.1N∙s/m^2, and that it flows at an average speed of 0.5m/s.

a) What is the kinematic viscosity of the liquefied meat mixture in m²/s?

b) What is Reynolds number for liquefied meat mixture?

c) Is the flow laminar or turbulent?

d) What is the mass flow rate in kg/s?

You have to build a long cylinder that will be compressed at an angle slightly askew from the long axis of the cylinder. That squeezing force will cause a Z-axis pancake stack (like most of our printed cylinders are) to shear apart at printed layers.
What modifications do you suggest to the print of this cylinder that can resist this compression force?​