Of all the problems facing the Byzantine Empire in the eleventh century, the greatest problem for the empire was the
a. adoption by the Kievan Rus of the Eastern Orthodox faith.
b. death of emperor Basil II.
c. Great Schism of the universal church.
d. rise of the Seljuk Turks.
d. rise of the Seljuk Turks.
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Tarantulas _____ just prior to a molt
a. bury themselves in sand b. self-mutilate c. stop eating d. become very aggressive
Define "desuperheat."
What will be an ideal response?
A piston-cylinder device contains a vapor-liquid equilibrium mixture of water at T=150 °C. The quality of the mixture is initially q=0.90 and the volume of the mixture is initially 1 m3. The vessel is compressed at constant T and P until the quality is q=0.3.
A) Determine the initial masses of the liquid and vapor phases. B) Determine the work required to complete the compression. C) Determine the change in enthalpy of the mixture.
How is ultrasound used in leak detection?
A) It causes the formation of bubbles near a leak. B) It makes exiting gases visible. C) It amplifies the sound of a leakage. D) It allows for a visual close-up of the system.