What is the future of mechanical engineering in drone?

Write a program to run on your Arduino and PortMaster board that will sequentially turn on and off the LED segments, so it resembles Cylon eyes (https://youtu.be/UajcgzK2shQ). Use the millis() construct shown in lecture rather than delay(). The traverse from one side to the other should take about 1 second.

Five lbs of propane is contained in a closed, rigid tank initially at 80 lbf/in.², 50°F. Heat transfer occurs until the final temperature in the tank is 0°F. Kinetic and potential energy effects are negligible.

Determine the amount of energy transfer by heat, in Btu.

The drive shaft of a dump truck is constructed of 3.5” OD x 1/4” wall round tubing made of ASTM A242 steel. The driveshaft is 65” long and is subjected to 500 lbf*ft of torque.

• What is the maximum shear stress in the drive shaft?

• What is the safety factor with respect to yielding?

• How much torque would result in a 1° twist of the drive shaft?

Five kmol of oxygen (O2) gas undergoes a process in a closed system from p1 = 50 bar, T1 = 170 K to p2 = 25 bar, T2 = 308 K. Determine the change in volume, in m3.

A piston–cylinder assembly contains propane, initially at 27°C, 1 bar, and a volume of 0.1 m3. The propane undergoes a process to a final pressure of 4 bar, during which the pressure–volume relationship is pV1.1 = constant. For the propane, evaluate the work and heat transfer, each in kJ. Kinetic and potential energy effects can be ignored.

Refrigerant 22 undergoes a constant-pressure process within a piston–cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 25°C. Kinetic and potential energy effects are negligible.

Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.

list and explain the principles of behavior-based safety and why an employer should use this concept in the workplace

A Brinell hardness tester is used to determine the hardness of 1/2" thick steel plate. The specifications for the steel require that the steel have a tensile strength between 125 ksi and 150 ksi. A 3000 kg load is used for the test.

A. Calculate the minimum and maximum Brinell hardness of the steel.

B. If a hardness test reveals that the Brinell hardness of the steel plate is 260 BHN what is the diameter of the indention in the surface of the plate from the Brinell hardness test?

How many tons of refrigeration is required to cool 50 GPM of liquid from 110 F to 50 F ?

The liquid has a specific heat of 1.40 BTU/lb F and density of 9.2 lb/gal.

Note:

1 Ton refrigeration = 12,000 BTU/hr

What causes a percent error between the calculated value (done by a computer program like ANSYS) and the the theoretical value (done on paper) for bending stress?

An ideal Otto cycle uses air as the working fluid; its state at the beginning of the compression is 120 psia and 60°F, its temperature at the end of the combustion is 1500°F, and its compression ratio is 9. Use constant specific heats at room temperature. Determine the rate of heat addition and rejection for this ideal Otto cycle when it produces 120 hp. The properties of air at room temperature are R = 0.3704 psia·ft³/lbm·R, c_p = 0.240 Btu/lbm·R, c_v = 0.171 Btu/lbm·R, and k = 1.4.

The rate of heat addition is ____________ Btu/h.

The rate of heat rejection is ___________________ Btu/h.

In your opinion, how will the "car of the future" shape the automobile industry?

As a strategist, what would you recommend to industry's leaders in order to sustain in an impending changing environment?

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