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Studentka2010 [4]
3 years ago
10

Which of the following statements best describes the relationship between availability of new green building products and custom

er demand for green building?
A. As more and more new green building products become available, customers will be more and more confused by the array of new choices.
B. The availability of new green building products needs to be accompanied by extensive marketing campaigns to make customers aware and drive demand.
C. New green building products can create new customer demand, which in turn can drive the development of more new products.
D. Customers only demand new green building products if, in addition to their environmental benefit, these products also lower costs and construction times.
Engineering
1 answer:
Fed [463]3 years ago
4 0

Answer:

c

Explanation:

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Assuming the transition to turbulence for flow over a flat plate happens at a Reynolds number of 5x105, determine the following for air at 300 K and engine oil at 380 K. Assume the free stream velocity is 3 m/s.

To Find:

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b. Expressions for the momentum and thermal boundary layer thicknesses as a function of x for a laminar boundary layer

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number reaches 5\times 10^5

(a).  \;\text{Rex}_{cr}=5 \times 10^5\\\\\frac{\rho\;vx}{\mu}=5 \times 10^5\\\text{density of of air at}\;300K=1.16  \frac{kg}{m\cdot s}\\\text{viscosity of of air at}\;300K=1.846 \times 10^{-5} \frac{kg}{m\cdot s} \\v=3m/s\\\Rightarrow x=\frac{5\times 10^5 \times 1.846 \times 10^{-5} }{1.16 \times 3} =2.652 \;m \;\text{for air}\\(\text{similarly for engine oil at 380 K for given}\; \rho \;\text{and} \;\mu)\\

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