Answer:
Explanation:
Given that velocity=6 m/s
Temperature of surface=75 °C
Temperature of air=25 °C
Reynolds number =
It means that this is laminar flow.So Nusselt equation given as follows
Now properties of air at mean temperature of 75 °C and 25 °C (50 °C) is taken from standard table
K=0.028 W/m-K,Pr=0.71
And we also know that
Now by putting the values
Nu=406.24
So heat flux q= hΔT
q=227.49 x (75-25)
Answer:
Sampling rate = 90
23 and 45 Hz
Explanation:
The Nyquist criteria states that the sampling frequency must be at least twice of the highest frequency component.
(a) We have 10, 12, 13, 23, and 45 Hz signals
The highest frequency component in this list is 45 Hz
So minimum sampling frequency needed to avoid aliasing would be
Sampling rate = 2*45 = 90 sps
Hence a sampling rate of 90 samples per second would be required to avoid aliasing.
(b) if a sampling rate of 40 sps is used then
40 = 2*f
f = 40/2 = 20 Hz
Hence 23 and 45 Hz components will be aliased.
Answer:
NOT WISE
Explanation:
given,
T₁ = 87⁰C = 273 + 87 = 360 K
T₂ = 27⁰C = 273 + 27 = 300 K
work output given = 10 J
efficiency will be equal to :
output delivery = η ₓ input
= 0.166 ₓ 40
= 6.66 J
hence, the output of new engine is less than the old one so, investing in new engine will not be feasible.
The relationship between green building and self-interest include the following:
- Green building is burdensome but has advantages in terms of public image
- Green building is attractive because of its long-term growth potential as a market.
<h3>What is Green building?</h3>
This is the process of reducing the environmental impact of buildings. This therefore leads to enhancement of the health of people.
Its relationship with self interest can seen listed above as the most appropriate choice.
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