?What could occur if system installers fail to compensate for roof sags?
A. ?The increased average weight of the system may cause the roof to fail.
B. ?The drainback system will not operate.
C. ?The system could have a steeper pitch than required.
D. ?Low points are created where freezing water may occur.
Answer: D
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Verify that the flow is turbulent.
The mechanical-energy balance provides a basis for estimating pressure drop owing to friction in fluid flow. For steady flow of an incompressible fluid in a horizontal pipe of constant cross-sectional area, it may be written,
where 
is the Fanning friction factor. Churchill gives the following expression for 
for turbulent flow:
Here, Re is the Reynolds number and ? /D is the dimensionless pipe roughness. For pipe flow, Re ? u?D/?, where D is pipe diameter and ? is dynamic viscosity. The flow is turbulent for Re > 3000.
Consider the flow of liquid water at 25°C. For one of the sets of conditions given below, determine 
and 
Assume ? /D = 0.0001. For liquid water at 25°C, ? = 
, and ? =
(a) D = 2 cm, u = 1
(b) D = 5 cm, u = 1
(c) D = 2 cm, u = 5 
(d) D = 5 cm, u = 5
As firms grow, because of insufficient time or personnel, not every landscape job can be accepted
Indicate whether the statement is true or false
What are the primary considerations in chemical control of unwanted plants?
What will be an ideal response?
During the planning stage of a lockout-tagout procedure, what will be included in the written plan?_____________________________________________________________________
What will be an ideal response?