Technician A says that engine blocks are either cast iron or aluminum. Technician B says that Styrofoam may be used inside a mold to form water jackets and cylinder bores. Which technician is correct?
A) Technician A B) Technician B C) Both technicians D) Neither technician
C
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A baker has developed a marvelous cookie recipe that works best if the cookie is cooled in a vacuum chamber through radiation heat transfer alone. The cookie is placed inside the chamber with a surface temperature of 125°C. Assume that the cookie is thin enough so that the temperature is uniform throughout during the cooling process. The walls of the chamber are maintained at 10.0°C. If the surface area of the cookie is 0.005 m2, and if the emissivity of the cookie is 0.80, determine the initial radiation heat transfer rate from the cookie to the walls of the chamber.
Given: Ts = 125°C = 398 K; Tsurr = 10°C = 283 K; A = 0.005 m2; ? = 0.80 What will be an ideal response?
The local committees of correspondence organized by Samuel Adams
A. promoted his bid to become governor of Massachusetts. B. promoted independent action in each colony to support the British. C. kept opposition to the British alive, through exchange letters. D. served as a precursor to the United States Postal Service. E. led to the Boston Massacre.
What is the most reliable form of backflow protection?
What will be an ideal response?
What resistance readings indicate a good cad cell?
What will be an ideal response?