Write a Matlab Code for the following:

A co-op is paid a $15.00 hourly wage up to 20 hours per week. In addition, any hours over 20, the co-op collects an overtime wage that is 1.5 times greater, and any hours over 30, 2.0 times greater. Using an in-else statement, write a code that calculates the co-op’s gross paycheck for: a) 15 hours worked b) 28 hours worked c) 35 hours worked

5- What are differences in Brinell, Rockwell and Vicker hardness measurements? Write your answer in a tabular form based upon type of indenter(s) used, range of applied typical loads and type of material substrates where test is typically applicable and one example per material of application where test could be used.

Text Book- The Science and Engineering of Materials, Askeland et al. (seven edition)

Home Work- # 6 for Chapter 6

please yype your answer in the computer

thanks,

Air enters an air conditioning unit at 32oC, 80% relative humidity, and with a mass flowrate of 12 kg/min. It is to be conditioned to 25oC and 50% relative humidity. In order to do this, part of the moisture in the air must be removed as condensate at 30oC. Be able to draw the path that the atmospheric air takes on the psychrometric chart. Find

a. The rate of moisture removal from the air, mw 

b. The rate of heat removal from the air, in kW

c. The temperature to which the incoming humid air must be cooled to achieve the desired rate of condensation

What are the factors in determining your takeoff critical field length for a certain runway? If after doing initial calculations you find the runway is too short, what might you be able to do as the pilot in command to be legal for takeoff?

Compare and contrast the longitudinal stability of a conventional aircraft in two conditions: forward CG and aft CG? Discuss control forces and aircraft responses from trimmed condition if you pulled back on the stick and let it go.

Compare and contrast a supercritical wing with a laminar flow wing? Discuss modern aircraft that have utilized these wings. What are the enhancements and drawbacks?

Problem Statement (Good luck…): Using Saint-Venant’s Principal and its importance to the analysis of stress acting on a volume element within a body and finite element theory, why is it “technically” incorrect and unrealistic to apply a point load while running a finite element simulation?

Steam, initially at 700 lbf/in.², 550°F undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 2200 lbf/in.² Kinetic and potential energy effects are negligible.

Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.4,
(a) using data from the steam tables.
(b) assuming ideal gas behavior.

The volume of 1 kg of helium in a piston-cylinder device is initially 7 m3 . Now helium is compressed to 3 m3 while its pressure is maintained constant at 150 kPa. Determine the initial and final temperatures of helium as well as the work required to compress it, in kJ. You may assume deal gas behavior.

A compression spring has a diameter of 0.67 in and a coil diameter of 0.067 in, with 30 total coils.
The spring is to be made of unpeened HD A227 wire and have squared and ground ends. Find the
fatigue factor of safety when repeatedly cycled from 0 to 10.3 lbf. Use the Gerber fatigue criterion
and the Zimmerli data.

An insulated steel pipe carries hot water at 80 ºC. The outer surface of the insulation loses heat to the environment by convection and radiation. For convection, assume hconv = 5.8 W/m2.ºC. The emissivity of the insulation is 0.88 and conductivity, k = 0.038 W/mK. The surroundings are at 30 ºC. Assume the inner surface of the insulation is at the water temperature. What is the surface temperature of the insulation?

Consider the impact of compression of the air-fuel mixture on turbulence. Assume that an idealized turbulent eddy is represented by a gas disc 3 mm in diameter, d, and 0.5 mm thick, l, at atmospheric pressure and temperature. The disck is spinning around its axis at 1000 rpm. What is the rotational speed of the disk after it is adiabatically compressed to 25 atm pressure? The gas disc is compressed equally in both the radial and axial direction; that is d₁ / d₂ = l₁ / l₂. Discuss the results in terms of turbulence in engines.

Use the contact power theory to predict the maximum gas pressure drop (in inches of water) across a scrubber which must be designed to achieve 97% efficiency. Given: Gas Flow rate = 8000 acfm Liquid Flow rate= 60 gal/min Liquid inlet pressure= 50 psi Alpha= 1.31 Beta= 1.12

Calculate the vapour pressures of n-hexane and n-decane above a mixture at 25◦C containing 2% n-C6H14 +98% n-C10H22, by volume. Assume that the densities of pure n-hexane and n-decane are 660 and 730kg/m3, respectively and that the liquids behave ideally.

What is the difference between a two-wire and three-wire motor control circuit?

One method for reducing the pumping work in throttled spark-ignition engines is early intake valve closing (EIVC). With EIVC, the inlet manifold is held at a pressure pi, which is higher than the normal engine intake pressure pi*. The intake valve closes during the intake stroke. The trapped fresh charge and residual is then expanded to the normal cycle (lower) intake pressure, pi*. You can assume that both cycles have the same mass of gas in the cylinder, temperature and pressure at state 1 of the cycle.

a) Sketch a p-V diagram including both the standard and EIVC cycle. On the p-V diagram, shade the area that corresponds to the difference of pumping work between the standard and EIVC cycles.

b) What value of intake pressure pi and VEIVC will give the maximum reduction in pumping work for the EIVC cycle?

c) Derive an expression for this maximum difference in pumping work between the normal cycle and the EIVC cycle in terms of pe, pi*, Vc and Vm. Justify any assumptions you make.

1. Where are stress concentration produced and what design and manufacturing procedures reduce stress concentrations?

2. How do ductile and brittle materials differ in their response to tensile loads when a stress concentration is present?