How could you tell if a sample of matter is a element
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In general, a good sample is which can represent as much as possible the characteristics of the population. In the language of measurement, meaning that the sample must be valid, which can measure something that should be measured. A valid sample is determined by two considerations.
First: The accuracy or precision, the degree of absence of "bias" (error) in the sample. In other words, the less the error rate is in the sample, the more accurate the sample. Benchmarks for "bias" or error is population.
Cooper and Emory (1995) states that "there is no systematic variance"that means is there is no diversity of measurement due to the influenceof known or unknown, which led to scores tend to lead to a certainpoint.
Second: Precision. The second criterion is to have a good sample estimate of the level of precision. Precision refers to the question of how close we are to estimate population characteristics. There has never been a sample that can fully represent the characteristics of the population. Therefore,in each sampling always attached keasalahan-error, which is known as"sampling error" Precision is measured by standard deviation (standarderror). Thesmaller the difference between the standard deviation obtained from thesample (S) with a standard deviation of the population (s), the higherthe level of precision. Thoughnot always, the level of precision may be increased by adding thenumber of samples, the fault may be reduced if the number of samplesplus (Kerlinger, 1973).
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Answer:
The Team B is winning. The force is unbalanced.
Explanation:
Step 1: First we must fix a positive sense to the forces exerted. We take as positive the force of 4900 N.
Step 2: Now we must add forces to determine the value of the resulting force ().
= 4900 N - 4000 N = 900 N
Since is positive, team B will win the competition.
The resulting force is unbalanced because if it is balanced it should give 0.
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Final answer:
In the tug-of-war competition, team B is winning because it is exerting a stronger force. The net force is 900N to the left, showing an unbalanced force scenario, which will cause a change in motion or acceleration of the teams towards team B.
Explanation:
Let's visualize this tug-of-war contest as a simple force diagram. To the right, we have team A exerting a force of 4000N, and to the left, we have team B exerting a stronger force of 4900N. In terms of net force, this means we subtract the smaller force (team A's force) from the larger one (team B's force), giving us a net force of 900N in the direction of the stronger force—in this case, to the left, following team B.
This situation represents an unbalanced force scenario because the two forces are not equal in magnitude and do not cancel each other out. As a result, there is a net force leading to an acceleration—according to Newton's Second Law of Motion, any unbalanced force will cause a change in motion or acceleration. So, in this scenario, team B will be winning.
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Final answer:
Texture is a physical property that refers to the feel or consistency of a substance. It is determined by the arrangement and size of the particles that make up the substance. Texture is observed and described without any chemical changes occurring in the substance.
Explanation:
Texture
Texture is a physical property, not a chemical property. It refers to the feel or consistency of a substance or material. In chemistry, texture is often used to describe the physical characteristics of solids, liquids, and gases.
For example, when we describe a substance as being rough, smooth, soft, or hard, we are talking about its texture. Texture can be observed and described without any chemical changes occurring in the substance. It is determined by the arrangement and size of the particles that make up the substance.
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Answer :
Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as a product.
In this, A and C are the cations and B and D are the anions.
When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.
The balanced chemical reaction is,
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A cold front can cause heavy rain, thunder, and lightning.
An occluded front can cause light to heavy precipitation that may last several days.
A warm front brings drizzly weather.