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Len [333]
3 years ago
10

In low speed subsonic wind tunnels, the value of test section velocity can be controlled by adjusting the pressure difference be

tween the inlet and test-section for a fixed ratio of inlet-to-test section cross-sectional area.
a. True
b. false
Engineering
1 answer:
MArishka [77]3 years ago
7 0

Answer:

Hence the given statement is false.

Explanation:

For low-speed subsonic wind tunnels, the air density remains nearly constant decreasing the cross-section area cause the flow to extend velocity, and reduce pressure. Similarly increasing the world cause to decrease and therefore the pressure to extend.

The speed within the test section is decided by the planning of the tunnel.  

Thus by adjusting the pressure difference won't change the worth of test section velocity.

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A student wants to restate some ideas she found in a journal article by a prominent expert in economics. She combines her own wo
kipiarov [429]

Explanation:

Althought she referenced the article at the end, is imposible to know which part of the article is hers and which part is the expert's so that would be plagiarism.

If she used quotation marks in the words of the expert it would be clear and no plagiarism could be accused.

4 0
3 years ago
The data shows that recently the size of the raccoon population decreased. How will the decrease in the raccoon population affec
LenaWriter [7]

Answer: Increase in the population of lower organisms.

Explanation: Raccoons are mesopredators found in the middle levels of food webs and have critical impacts on the dynamics of many other species. Thus, they greatly contribute to the functioning of the ecosystem.

They are naturally equipped to checkmate the population size of other organism that are below them (i.e., their preys) in the food web. They are; predators, pathogen carriers (such as rabies), and competitors, as they compete with some specialist in the food web.

Hence, the decrease in the population of raccoons will lead to the increase in the population size of lower organisms they prey on in the food web or chain.

3 0
3 years ago
The concrete canoe team does some analysis on their design and calculates that they need a compressive strength of 860 psi. They
vlada-n [284]

Answer:

874 psi

Explanation:

Given a sample mean (x') = 900,

and a standard error (SE) = 10

At 99% confidence, Z(critical) = 2.58

That gives 99% confidence interval as,

x' ± Z(critical) x SE = 900 ± 2.58 x 10

The value of the lower limit is,

900 - 25.8 = 874.2

≈ 874 psi

8 0
3 years ago
A helical compression spring is to be made of oil-tempered wire, d, of diameter 1–mm with a spring index of C = 10. The spring i
BaLLatris [955]

Question

Determine the minimum hole diameter for the spring to operate in

Answer:

11 mm

Explanation:

Mean spring coil diameter is given from the following relationship

D=cd where C is spring index and d is the diameter of oil-tempered wire

By substitution

D=10*1 mm=10 mm

To find the outer diameter, we add the d to D hence getting the minimum hole diameter as

D_o= D+d= 10 mm+1 mm= 11 mm

5 0
4 years ago
WHICH TASK BEST FITS THE ROLE OF A DESIGN ENGINEER ?
pshichka [43]

Answer: drafting blueprints

Explanation:

5 0
3 years ago
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