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A full-page open letter with more than 700 signatures was recently released in a university campus newspaper. The letter according to www.texasenvironment.org protested the sale of the single-use, disposable plastic water bottles "shaped" like a university "symbol." The bottles are marketed to students and in local grocery stores and according to the article this does not align with the school's own sustainability program. The article reveals that with a global movement to ban plastic water bottles from college campuses, the university's decision has left students at the back of the environmental movement. What are the advantages and disadvantages of plastic bottles? What steps or procedures could be taken to minimize environmental impact of "single" use bottles? How would an engineer deal differently than a businessperson with the sale of disposable plastic water bottles?
blocks a and b are connected by a pulley system. the coefficient of kinetic friction between the block a and the
A well-insulated vessel is separated into two compartments by a partition. Compartment A contains 2 kg of water at 200C, 5 MPa and compartment B contains 0.983 kg of water at 200C, 0.1 MPa. The partition is removed and the water in both the compartme..
you have an electrical heater to heat-treat polymers. according to the manufacturers manual the heat flux at the
The figure shows an idealized structure consisting of one or more rigid bars with pinned connections and linearly elastic springs.
The actual part temperature is measured with a thermocouple which indicates 315?C. Both measurements have an uncertainty of ±1?C. From these measurements, determine the emissivity of the metal part and its uncertainty.
a train enters a curved horizontal section of track at a speed of 100kmh and slows down with constant deceleration to
An adiabatic gas turbine expands air at 1000 kPa and 500?C to 100 kPa and 150?C. Air enters the turbine through a 0.2-m2 opening with an average velocity of 40 m/s, and exhausts through a 1.09-m2 opening.
Calculate the angles made by F with the positive x, y-, and z-axes.
Methane gas (CH4) at 25° C, 1 atm enters an insulated reactor operating at steady state and burns completely with x % of theoretical air entering at 25°C, 1 atm.
A pressure transducer has a damping ratio of 0.3 and a natural frequency of 12,000 Hz. Determine the frequency range for which the amplitude dynamic error will be less than 10 percent.
The outer surfaces are exposed to ambient air, with T8,2 = 25°C and h z = 4 W/m2 · K. while hot oil flowing through the hole is characterized by Tx.1 = 300°C and h1 = 50 W/m2 · K. Determine the corresponding heat rate and surface temperatures.
a gas turbine power plant with regeneration delivers 80.000 hp. the lowest pressure in the cycle in 14.7 psia and the
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