Question 6 (3 points)

1. Which best describes why it is important for a scientist to use the metric system when recording data?

hoa [83]

<h3>1.<u> Answer;</u></h3>

A. so the data can be proven in the scientist’s next experiment

<h3><u>Explanation; </u></h3>

<em><u>Metric system is the standard or primary system that is accepted and used in science all over the world</u></em>.
<em><u>Metric system is utilized all over the word thus making it possible for scientists</u></em> to be in a position to share data verify and ascertain that the results presented by other scientists and the methods used.

<h3>2. <u>Answer;</u></h3>

A. resistance to change

<h3><u>Explanation;</u></h3>

<u><em>Pseudoscience involves a system of theories and assertions concerning the nature which appear to be scientific but in real sense they are not.</em></u> For example, astrology is viewed as pseudoscience.
Pseudoscience is characterized by; contradictory, exaggerated or unfalsifiable claims, lack of openness to evaluation by other experts, reliance on confirmation bias, etc.

<h3>3. <u>Answer;</u></h3>

A. Observable and objective

<h3><u>Explanation;</u></h3>

Scientific facts should be verifiable such that they should rest upon sense data, they should be based on evidence that is verifiable.

<em><u>Scientific facts should be open to further investigation, that is they should be falsifiable and repeatable. Also they should observable and objective</u></em>. They should open to further investigations and also flexible in case new facts emerge they can be changed.

<h3>4. <u>Answer;</u></h3>

D. Ethics

<h3><u>Explanation;</u></h3>

Since research involves humans participants and also human subjects, it involves complex and specific ethical, legal social and political notions.
<em><u>Ethics in research entails the evaluation of ethical issues that are raised when human beings as involved as participants or subjects in research</u></em>
<em><u>The major problem with the testing of the Ebola vaccines will be the recruitment of people who are going to volunteer to have the Ebola virus inserted into their system </u></em>so that the potency of the vaccines can be tested. A lot of ethical challenges surround this.

<h3>5. <u>Answer;</u></h3>

Pseudoscience is often based only on opinions.
Pseudoscience often involves explanations of beliefs.

Pseudoscience includes subjective ideas.

<h3><u>Explanation;</u></h3>

<u><em>Pseudoscience involves a system of theories and assertions concerning the nature which appear to be scientific but in real sense they are not.</em></u>

<em>Pseudoscience is </em>characterized by; contradictory, exaggerated or unfalsifiable claims, lack of openness to evaluation by other experts, reliance on confirmation bias, etc.

<h3>6.<u> Answer;</u></h3>

A objective

Science does not rely <em><u>objective </u></em>on ideas based on opinions instead of facts because science works to avoid the influence of opinions and beliefs.

<h3><u>Explanation;</u></h3>

<em><u>Science knowledge is objective which means the ability to observe and accept facts as they are, and not as individuals would want them to be. </u></em>
<u><em>Objectivity entails the ability to guard science knowledge against their own biases, wishes, values, beliefs and preferences. </em></u>

<h3>7. <u>Answer;</u></h3>

A. Process and facts, because they are using a systematic method to measure and then record data

<h3><u>Explanation;</u></h3>

<em><u>Scientists and researchers use scientific investigation to answer questions about the daily occurrence of certain events about the world. It also entails communicating the outcome or results to the individuals around the world.</u></em>
<em><u>Scientific investigation may be descriptive, comparative or experimental investigation.</u></em>

<h3>8. <u>Answer;</u></h3>

B. Scientific, because observations of brain growth and chemicals are made carefully and repeatedly

<h3><u>Explanation;</u></h3>

<em><u>A claim refers to a statement or a conclusion that intend to answer the original problem or question. </u></em>

The claims are scientific because they are falsifiable, repeatable and reproducible, which means just like scientific experiments they can be proved.

<h3>9. <u>Answer;</u></h3>

B. There are probably very few astronauts with twin siblings.

<h3><u>Explanation;</u></h3>

<em><u>All scientific experiments should follow certain principles of proper investigation in order for the results obtained at the end of the experiment to be considered credible.</u></em>

<em><u>A well designed scientific experiment should have features that allow scientists to eliminate extraneous variables as an explanation for the relationship observed between dependent variable and independent variables.</u></em>

4 0

3 years ago

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Calculate the coefficient of friction of a 12kg object that has a force of friction of 3N

postnew [5]

Answer:

0.026

Explanation:

The force of friction acts in the direction perpendicular to the norm force of the surface on which the object rests, induced by gravity. The magnitude of the friction force is

(Friction) = (mass) x (gravitational acceleration g) x (coefficient of friction)

from which the coefficient of friction can be determined:

(coefficient of friction) = (Friction) / ((mass)x(g)) = 3 N / (12 kg * 9.8 m/s^2) = 0.026

3 0

3 years ago

Why does a balloon fully inflated with air rise up vertically for some distance whenpunctured from below?

Virty [35]

Newton's second and third law can be found the correct answer is:

The force of the air leaving the balloon by action and reaction causes it to have a positive acceleration upward and rise.

Pressure is defined by the relationship between forces and area,

P = F / A

Where P is pressure, F is force and A is area

F = P A

Newton's second law is that the sum of the external forces of a body is proportional to the mass of the body and the acceleration

Newton's third law or action and reaction says that forces in nature appear in pairs on the two interacting bodies, the magnitude of the force is equal, but in the opposite direction; each one is applied to one of the bodies.

A free-body diagram of the process is shown in the attachment

B + F - W = m a

W = m g

Where B is the thrust, F the force of air exit, W the weight, m the mass and the acceleration of the body

Archimedes' principle states that the vertical thrust on a body is equal to the fart of the dislodged fluid, in this case air.

B =ρ_{air} g V_{air}

Where ρ and V_ {air} are the density and volume of the air, respectively,

It's substitute

ρ_{air} g V_{air} + P A - m g = m a

a =

The mass of the body is formed by the mass of the balloon plus the mass of air that it contains

Let's analyze this expression in three moments

Before opening the hole at the bottom. The second term is zero, so the thrust is not enough to lift the balloon, the acceleration is negative.

Just after opening. The force of the air coming out that by the law of action and reaction creates a force of equal magnitude and upward direction on the balloon. The sum of these two forces makes the acceleration positive, therefore the balloon rises

After the pressure inside the balloon is equal to the atmospheric pressure. Tthis case the second term is zero again and the balloon begins to descend with an acceleration less than the acceleration of gravity.

In conclusion with Newton's second and third law we find the correct answer is:

The force of the air leaving the balloon by action and reaction law causes it to have a positive acceleration upward and rise.

Learn more about Newton's law here:

brainly.com/question/13959891

6 0

3 years ago

A block of 250-mm length and 48 × 40-mm cross section is to support a centric compressive load P. The material to be used is a b

Marrrta [24]

Answer:

153.6 kN

Explanation:

The elastic constant k of the block is

k = E * A/l

k = 95*10^9 * 0.048*0.04/0.25 = 729.6 MN/m

0.12% of the original length is:

0.0012 * 0.25 m = 0.0003 m

Hooke's law:

F = x * k

Where x is the change in length

F = 0.0003 * 729.6*10^6 = 218.88 kN (maximum force admissible by deformation)

The compressive load will generate a stress of

σ = F / A

F = σ * A

F = 80*10^6 * 0.048 * 0.04 = 153.6 kN

The smallest admisible load is 153.6 kN

8 0

3 years ago

A force is applied to a block sliding along a surface (Figure 2). The magnitude of the force is 15 N, and the horizontal compone

patriot [66]

If I have done my math correctly, your answer is 67.5

4 0

3 years ago

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