Engineering, 27.02.2020 19:28 destini69
You work in a product design company and are creating a new alarm clock for children. You want to find the best sound for the alarm clock that wakes children up the fastest. You must design a multifactorial experiment to test different sounds on sleeping children. Your team has identified three variables of interest to test, with two levels for each variable. The variables are:
- alarm intensity (quiet vs. loud)
- pitch (low vs. high),
- sound type (musical vs. buzzer).
a) How many tests will you need to run to test all the variables, and why?
b) Write down a brief procedure you would follow to measure how fast a child wakes up after an alarm, during a single experimental test.
c) Your teammate suggests that you repeat each test on three different children. Is this a good idea, and why or why not?
d) Data is sometimes not perfect, and may contain a lot of variabilities; this is called “noise” (or “noisy data”). What are the three possible sources of noise (or variability) in your data?
e) What are three different methods you could use to control or reduce the noise in your data?
Answers: 2
Engineering, 04.07.2019 18:10
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
Answers: 1
Engineering, 04.07.2019 18:10
Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.
Answers: 2
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
Answers: 2
Engineering, 04.07.2019 18:20
Asimple rankine cycle uses water as the working fluid. the water enters the turbine at 10 mpa and 480c while the condenser operates at 6 kpa. if the turbine has an isentropic efficiency of 80 percent while the pump has an isentropic efficiency of 70 percent determine the thermal efficiency
Answers: 1
You work in a product design company and are creating a new alarm clock for children. You want to fi...
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