Which of the following actions will not add strain to your back when lifting?
a. holding an object close to your body
b. twisting while lifting
c. holding an object away from your body
d. lifting with back muscles rather than leg
muscles
a. holding an object close to your body
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Consider one-dimensional mass transfer in a moving medium that consists of species A and B with ? = ?A + ?B = constant. Mark these statements as being True or False.
_____(a) The rates of mass diffusion of species A and B are equal in magnitude and opposite in direction. _____(b) DAB = DBA. _____(c) During equimolar counterdiffusion through a tube, equal numbers of moles of A and B move in opposite directions, and thus a velocity measurement device placed in the tube will read zero. _____(d) The lid of a tank containing propane gas (which is heavier than air) is left open. If the surrounding air and the propane in the tank are at the same temperature and pressure, no propane will escape the tank, and no air will enter.
With proper nutrition and care, most birds live 2 to 5 years.
Answer the following statement true (T) or false (F)
Quite often, technicians rely on their gauge manifolds to determine if a sufficient vacuum has been achieved. This __________ acceptable field practice.
A. is B. is not
The two broad types of fan designs are:
A) Forced draft and induced draft. B) Propeller and squirrel cage. C) Forward-curved and backward-curved. D) Centrifugal and axial.