A sensor outputs a voltage in the range of ±3mV. Your A/D samples at 1000 Hz, has an input range of ±10V, and has a 12-bit resolution. Design an active filter to amplify the sensor signal to fit at least 75% of the range of the A/D and filter anything above the Nyquist frequency. Justify your assumptions and show your work.

Two materials, one with ε1 = 0.9 and the other with ε2 = 0.2 are available to use as filaments (light sources) for an incandescent lamp. Material 1 can be maintained at 2800 K, whereas material 2 can be maintained at 3000 K. Calculate the rate at which radiant energy is emitted per unit surface area (Watts/m2 ) from each of the two materials in the spectrum 0.4µm < λ< 0.8µm. Which material emits energy at the highest rate in this spectrum (assuming same surface area for both materials)?

A 10 L adiabatic container contains 0.1 mol of air, at a temperature of 250 K. It is closed by a stopcock. Ambient air is at 300 K at a pressure of 1 bar. The stopcock is opened for a moment and a certain amount of air penetrates into the container. After thermal equilibrium is reached inside the container, the gas temperature is measured to be 350 K. 1) Assuming that the air behaves as an ideal gas, find the initial pressure in the container, the number of moles of air that penetrated in the container, the sum of the internal energy changes for the gas inside the container and the gas that entered it and the final pressure inside. 2) Find the enthalpy and entropy changes of the gas that is inside the container at the end of the process. Use κ = Cp,mol/CV,mol = 7/5 and Cp,mol − CV,mol = R.

choose a type of electric motor and search the internet to find the specs and operational information such as horsepower rating available cost and common application

Falls from Same Level and Falls from Heights

300-500 discussion, Please do not Copy write (will get a thumbs down)!!!!!!!!

Employers should be more concerned with falls to the same level than falls from heights?

(cantilever beam)

In most practical applications the dimensions do not scale down by the same amount. Using the formula’s given in class/lectures derive the overall scaling factor for the mass and deflection if the width, thickness, and length is scaled down by 10x, 100x, and 5x respectively.

Consider a career path. Discuss one example of a current materials challenge in that field. What solutions might exist?

A centrifugal pump with an impeller diameter of 30cm and speed 1800RPM operating at its best effiecieny point develops a head of 30m and a flow of 3900L/min. while requiring power of 24kW. This pump is scaled up to provide a flow of 11000L/min. and a head of 75m. Determine the impeller diameter, speed, and a brake power of the new pump.

One option for a material product’s end of life is recycling. Why is recycling of metals more successful than that of polymers? What are the additional challenges in recycling polymers compared to metals?

Using the Angström–Page method, calculate the average horizontal insolation in Hamburg in May and in October with PS 40% and 60%, respectively.

A 2024-T3 aluminum bar has rectangular cross section dimensions of 2" x 0.5". The length of the column is 9.0 inches.

A) Calculate the transition slenderness ratio (Sr)_D for this column. [Answer should be 69.9]

B) Calculate the slenderness ratio for your assigned column length. [Answer should be 62]

C) Calculate the maximum unit load (P_cr/A) for the bar. Indicate whether the column is a Johnson or Euler column. [Numerical answer should be 25296 psi but I don't know Johnson or Euler]

Please show steps for all parts.

1--Defects of various castings and suggest suitable remedies??

2-- Comparisons of quality aspects of metal casting processes ??