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3 years ago

Plz help!! List 3 ways that scientists and engineers develop, use, and refine models

1 answer:

5 0

These are some ways how scientists and engineers develop, use and refine models.

1. Imagine. They have to know what exactly trying to model. They have to imagine and brainstorm what are the things to be considered.

2. Reason. Next, they need to answer the questions brought from their brainstorming. They need to be able to reason out.

3. Calculate and Predict. Once they know it, that's the time they can start modelling and calculate - and predict.

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A spheroidal bacterium with a diameter of 1 mm contains 2 molecules of a particular protein. What is the molar concentration?

creativ13 [48]

Answer : The molar concentration is, $6.35\times 10^{-18}mol/L$

Explanation :

First we have to calculate the moles of protein.

$\text{Moles of protein}=\frac{\text{Number of molecules of protein}}{\text{Avogadro's number}}$

Number of molecules of protein = 2 molecules

Avogadro's number = $6.022\times 10^{23}molecules/mol$

$\text{Moles of protein}=\frac{2\text{ molecules}}{6.022\times 10^{23}molecules/mol}=3.32\times 10^{-24}mol$

Now we have to calculate the radius.

Radius = $\frac{Diameter}{2}=\frac{1mm}{2}=0.5mm=5.0\times 10^{-4}m$

Conversion used : (1 mm = 0.001 m)

Now we have to calculate the volume.

$V=\frac{4}{3}\pi r^3$

$V=\frac{4}{3}\times 3.14\times (5.0\times 10^{-4}m)^3$

$V=5.23\times 10^{-10}m^3=5.23\times 10^{-7}L$

Conversion used : (1 m³ = 1000 L)

Now we have to calculate the molar concentration.

$Concentration=\frac{\text{Moles of protein}}{\text{Volume}}$

$Concentration=\frac{3.32\times 10^{-24}mol}{5.23\times 10^{-7}L}$

$Concentration=6.35\times 10^{-18}mol/L$

Thus, the molar concentration is, $6.35\times 10^{-18}mol/L$

4 0

3 years ago

All of the following characteristics of clouds indicate high speed winds, EXCEPT…

raketka [301]

B) Billowy sheep-like clouds.

4 0

2 years ago

What is a group of rhinoceros called?

Mnenie [13.5K]

A group of rhinoceros is called a "crash".

6 0

3 years ago

If an egg was 20% of a birds body weight how much does it weigh if the bird was 10 pounds

Ira Lisetskai [31]

10*0.2=2lb egg

8lb bird

7 0

3 years ago

Suppose it were possible to conduct sophisticated microscopic and chemical analyses of microfossils found in 3.5-billion-year-ol

soldier1979 [14.2K]

Answer:

The correct answer is option 3. a nucleus.

Explanation:

The first genetic material present in the early organisms were RNA which was present in the microscopic organisms back then 3.5 billion years ago which means it is normal to have RNA in such microfossils chemical analysis.

Since, the nucleus was not present in early life forms of prokaryotes like bacteria. so, it is unusual to find nucleus in the fossils of stromatolite rocks.

Thus, option III is the correct answer.

7 0

3 years ago