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strojnjashka [21]
3 years ago
5

Which is a closed system.a tree, a human ,a clock , or a car

Biology
1 answer:
melomori [17]3 years ago
4 0
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
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Which is an inference?
Yanka [14]

Answer:

After watching a plant for a week, you determine it needs more sunlight.

Explanation:

Inference is a process by which, through certain data, a conclusion is reached. Other synonyms for inference are conclusion, implication, ilation and consequence.

Accordingly, an inference is made when after watching a plant for a week, you determine that it needs more sunlight. This was a conclusion based on data.

Not all inferences offer true conclusions, even with data analysis. It is possible to state that all dogs are furry animals with four legs, but it cannot be inferred that all furry animals that have four legs are dogs.

Inferences usually arise from an analysis of characteristics and probabilities. If someone makes reference to an animal with four legs, hairy and wagging its tail, it can be inferred that the most certain thing is that it is referring to a dog.

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3 years ago
In your own words, explain the difference between the pitch and intensity of sound.
lutik1710 [3]

Answer:

The pitch of a sound is how high or low a sound is when we hear it, whereas the intensity of a sound is the energy/vibrancy of the sound over an area and depends on the frequency of the sound as well.

6 0
1 year ago
How many food calories can a human burn up in an hour by exercising at this rate? (remember that only 20.0 % of the food energy
blsea [12.9K]

Human can produce a maximum mechanical power of 1/3 hp (horse-power).

Horse power is a unit of power, it equals 746 watt (watt is also a power unit, known to be equal to a joule per second)


So:

1 ph = 746 watt = 746 J/s

1/3 ph = 248.6 J/s

we're looking for the calories, so

1 joule = 0.239006 calories


So human produce a maximum mechanical power of:

248.6 J/s = 82.88 calories per second.


We're looking for the number of calories consumed in three hours, so:

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The number of food calories is 895.2 food calories

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Mice21 [21]

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Explanation:

4 0
2 years ago
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Which of the following best describes the logic of scientific inquiry?
beks73 [17]

Answer:

d. if my hypothesis is correct, I can expect certain test results

Explanation:

To create a theory is not enough to state an assumption. Called scientific research, the practice tries, through a logical procedure, to produce tested, proven and safe scientific knowledge. This concept is based on the logic of scientific research that states that a hypothesis must be tested, because if the hypothesis is correct, certain test results can be expected. For this, some rules or phases are part of the process. And they are: observation, hypotheses, research method and conclusion.

Thus, we can conclude that among the alternatives presented, the one that best describes the logic of scientific investigation is the letter D.

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