What is unique about salamander reproduction?
a. Male sperm is not needed
b. Mating and egg laying need not occur in the same season
c. Males incubate the eggs
d. Hatch young with no tails
d
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The Reynolds number Re is a dimensionless group that characterizes the intensity of a flow. For large Re, a flow is turbulent; for small Re, it is laminar. For pipe flow, Re ?u?D/?, where D is pipe diameter and ? is dynamic viscosity.
(a) If D and ? are fixed, what is the effect of increasing mass flow rate ? on Re? (b) If ? and ? are fixed, what is the effect of increasing D on Re?
In the US Midwest, the most popular way of using evaporative cooling for comfort applications is which of the following?
A) Water-side economizer. B) Direct evaporative cooling. C) Indirect evaporative cooling.
What was the primary reason that Alexander the Great invaded Persia?
a. to avenge his father’s assassination b. to make an example of Persia and thus deter any further Greek resistance to his power c. to obtain gold to replenish his treasuries d. to repeat the symbolic deeds of the heroes and gods of the Greek past
In linear multipliers, SF stands for
A) single-ended frequency B) side-band frequency C) scale factor D) standard frequency