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Leona [35]
3 years ago
5

Technological advances in transportation have come about in response to the depletion of fossil fuels and other negative aspects

of the internal combustion engine. There are many positives to these advancements, but there are also some negatives. Which statement is a negative aspect of these advancements?
A) These advancements use renewable resources like corn.
B) These advancements do not contribute to the greenhouse effect.
C) These advancements use cleaner fuels thereby reducing pollution.
D) These advancements are very expensive and not available to everyone.
Biology
1 answer:
kykrilka [37]3 years ago
6 0

Answer:

The correct option is <u><em>D) These advancements are very expensive and not available to everyone.</em></u>

Explanation:

Consider the statement A. It states that the new technological advances uses renewable sources of energy. This is a positive aspect as the energy can be renewed and replaced. The corn from which this energy is derived can be produced over and over again. Hence, this is a positive aspect, not a negative aspect.

Consider statement B. This statement tells us that the new technological advances will not result in warming the Earth's atmosphere by greenhouse effect. Hence, it is a positive aspect.

Consider statement C. It states that the new technological advances will lead to lesser pollution. Hence, it is a positive aspect.

<u><em>Now, consider statement D. It is a drawback because technological advances are too expensive to be used by many people. Hence, it is a negative aspect.</em></u>

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8 0
3 years ago
What is the Reynolds number for blood leaving the heart through the aorta if the diameter of the aorta is 2.15 cm and the blood
defon

Answer:

b. laminar flow

the reynold number is 1329.26

Explanation:

Re = (V x D x ρ)/ η

where,

V = mean velocity = 15.9 cm/s = 0.159m/s

D = vessel diameter = 2.15cm = 0.0215m

ρ = blood density = 1050 kg/m3 = 0.00105 kg/cm3

η = dynamic viscousity= 2.70 × 10-3 Pa·s = 2.70 × 10-3 kg/m-s

applying the formular to calculate for reynolds number, Re =

Re = (V x D x ρ)/ η

   =(0.159 x 0.0215 x 1050) / 2.70 × 10-3

   =3.589/0.0027 = 1329.26

the Reynolds number for the blood leaving the heart through the aorta if the diameter of the aorta is 2.15 cm and the blood has a dynamic viscosity of 2.70 × 10-3 Pa·s, a density of 1050 kg/m3, and travels at a mean fluid velocity of 15.9 cm/s is 1329.26

which flow through the aorta in a Laminar flow

Note that

a) turbulen= Re  >4000

b) laminar= Re  <2300

c) transitioning between laminar and turbulen= Re between 2100 and 4000

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3 years ago
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Answer:

C. clearing of ash juniper trees for farmland

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Golden-cheeked warblers will be in more danger if "clearing of ash juniper trees for farmland" will increase because juniper trees provide barks to build the nest for Golden-cheeked warblers, if Golden-cheeked warblers will not get enough barks to build the nest, they will not able to reproduce and their population will decrease further.

Hence, the correct answer is "C".

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