ANSWER 1: The manipulated variable is the fertilizer since the other factors (water and sunlight) are given in equal
amounts.
It is a controlled experiment because one group receives fertilizer while the other does not. Any
differences in growth should be due to either having fertilizer or not.
ANSWER 2: In order for it to be a theory, it has to be tested numerous times by multiple scientists.
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Explanation:
2. v=fλ
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Solids - particles are close together in a regular structure and vibrate about fixed positions
liquids - particles are close together but free to move past each other randomly
gases - particles are far apart and move randomly in all directions
The density of a substance changes when it changes state. Its mass does not change. This is because its particles do not disappear - they are just rearranged and occupy a different volume.
Answer:
With a person’s blood pressure is measured to be 120 ± 2 mmHg, it will be 1.2mmHg
Explanation:
What is missing in the question is the percentage of uncertainty.
If we assume that a person’s blood pressure is measured to be 120 ± 2 mmHg, the percent uncertainty is computed as:
% uncertainty = 2mmHg/120mmHg x 100% = 1.7%
So,
The uncertainty in the blood pressure is = 1.7% / 100% * 71mmHg = 1.2mmHg