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3 years ago

7

Read the following scenario.

2 answers:

andrew-mc [135]3 years ago

5 0

Answer:

Their experimental design lacks control group

Explanation:

Based on what I read, the scientists don't have a control group as one of the main groups thus they cannot, in scientific sense, say that the medicine is better or worse. You always need a control group receiving no intervention because then we can compare groups and assess the effectiveness of that intervention (in our case if we had control group vs people who received the medicine, we could see if the people who received the medicine had improved condition etc when compared to participants who did not receive anything)

olganol [36]3 years ago

5 0

Answer:

The answer is B: the lack of a control group

Explanation:

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a sphere of diameter 6•0cm is moulded into a thin uniform wire of diameter 0•2mm.calculate the length of the wire in metres

Scilla [17]

The length of the wire is 36 m.

<u>Explanation:</u>

Given, Diameter of sphere = 6 cm

We know that, radius can be found by taking the half in the diameter value. So,

$\text { sphere radius, } R=\frac{D}{2}=\frac{6}{2}=3 \mathrm{cm}=3 \times 10^{-2} \mathrm{m}$

Similarly,

$\text { wire radius, } r=\frac{0.2}{2}=0.1 \mathrm{mm}=1 \times 10^{-3} \mathrm{m}$

We know the below formulas,

$\text {volume of sphere}=\frac{4}{3} \times \pi \times R^{3}$

$\text {volume of wire}=\pi \times r^{2} \times l$

When equating both the equations, we can find length of wire as below, where $\pi=\frac{22}{7}$

$\frac{4}{3} \times \pi \times R^{3}=\pi \times r^{2} \times l$

$\frac{4}{3} \times \frac{22}{7} \times\left(3 \times 10^{-2}\right)^{3}=\frac{22}{7} \times\left(1 \times 10^{-3}\right)^{2} \times l$

The $\pi$ value gets cancelled as common on both sides, we get

$\frac{4}{3} \times 27 \times 10^{-6}=10^{-6} \times l$

The $10^{-6}$ value gets cancelled as common on both sides, we get

$l=4 \times 9=36 m$

7 0

3 years ago

3. If a voltage difference of 3.0 V causes a

MAXImum [283]

Answer:

it will be 1.8. voltage

that is wat I can't say

5 0

3 years ago

Please help as soon as possible

pochemuha

Answer:

Family Behaviors.

Explanation:

Family behaviors, such as the way you were raised and the ideas your family has about exercise, may influence your own ideas about exercise.

Family behaviors influence your ideas or actions for the future.

7 0

3 years ago

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Does centripetal force change in uniform circular motion?

HACTEHA [7]

It depends on how fast you are going and in orincipal no

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3 years ago

The particles of a gas are actually _____. electrons or protons protons or neutrons atoms or elements atoms or molecules

miskamm [114]

<u>Answer</u>

atoms or molecules

<u>Explanation</u>

A pure gas such as argon or neon is made up of individual atoms. Other compound gasses such as oxygen or carbon dioxide are made up of elements.

Protons, neutrons and electrons are parts of an atom. They are not actually particles but charges.

The answer to the question is <em>atoms or molecules.</em>

5 0

3 years ago

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