BIOLOGY MIDDLE SCHOOL

What describes how sliding friction affects pushing a cereal box across a tabletop?

Answers

Answer 1
Answer: Friction is defined as the force that opposes any applied force. Sliding friction affects pushing a cereal box in the sense that you have keep a constant applied force greater than the frictional force on the box to keep it moving. If you stop pushing, the box will stop due to the frictional friction. This is why a box won't keep moving across the table forever after you push it only a brief moment.

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Gloria’s science teacher has given her a sample of an unknown metal along with this table. Gloria finds that her sample has a mass of 53.5 grams and a volume of 2.5 cubic centimeters. The sample can be identified as copper. iron. lead. platinum.

Answers

The answer is:  [D]:  platinum .  
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Explanation:   Given the information provided, we need to find the "density" of the unknown metal; in: "mass per UNIT volume".  Then we need to look up the "density" values of EACH of the 4 answer choices (or at least until we get the corresponding density).  To be thorough, we still should look up the density of EACH of the metals listed in the answer choices given.  We look up these "densities" online, or in a specialty reference guide in university library, for instance.
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First, let us calculate the density of the unknown volume:
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 Density, "D",  = m / V ;  in which:  D = density; m = mass; V = volume;
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We are given:  mass, "m" = 53.5 g ;  and:
                           Volume, "V" = 2.5 cubic centimeters = 2.5 cm³
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D = 53.5 g / 2.5 cm³ = (53.5 / 2.5)  g / cm³  = 21.4 cm³ ;
                                                                        → Round to "2 significant figures"; 
                                                                       = 21 g/cm³
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We are given 4 (four) answer choices). Let us list EACH of the 4 (four) answer choices and their densities (researched).
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Choice "A" : copper; (Cu) ; density = 8.96 g / cm³ ;
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Choice "B" : iron ; (Fe) ; density = 7.874 g / cm³ ;
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Choice "C":  lead; (Pb) ; density =  11.34 g / cm³ ;
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Choice "D":  platinum;  density =  21.45 g / cm³ ;
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Clearly, Answer choice: [D]: "platinum" is the correct answer;  with a density of "21.45 g / cm³ " ;
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      Since this value is the closest to our calculated value of  
" 21 g/ cm³ ";  or even "21.4 g/ cm³ "  [our value before rounding down to 2 (two) significant figures].

    The densities of the metals in all the other answer choices given are far from this value.
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I hope this explanation has been of some help.

Answer:

Yeah, its platnium.

Explanation:

What is the essence of philosophical ethics

Answers

In Biology, Ethics explores the morality and problems connected to the uncertain sittuations. An example could be genetics. Some people are unsure of how should we treat genetically modified organisms, is it good or bad to modify them.

Another example could be cloning. There are many people who find cloning of living organisms unethical.

Answer:

Ethics, also called moral philosophy, the discipline concerned with what is morally good and bad and morally right and wrong. The term is also applied to any system or theory of moral values or principles. (Answered 7 years late but it’s ok )

Explanation:

What do all lipids have in common?

Answers

The common characteristic of all lipidsare that they are hydrophobic, so they are insoluble in polar solvents, such as water. They are, however, soluble in at least one non-polar organic solvent. The reason they are hydrophobic is that their molecules have long hydrocarbon chains with 16 to 18 carbon atoms.

Final answer:

All lipids are hydrophobic, meaning they do not dissolve in water. This results from their predominantly nonpolar carbon-carbon and carbon-hydrogen bonds.

Explanation:

All lipids, which are a type of macromolecule, share one fundamental attribute: they are hydrophobic, meaning they do not dissolve in water. Instead, lipids tend to cluster together when in a water-based environment. This hydrophobic quality results from the predominantly nonpolar carbon-carbon and carbon-hydrogen bonds that make up most of a lipid's structure. Other examples of lipids include fats, oils, and waxes.

Learn more about Lipids here:

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Imagine you do a an experiment to find out how soil moisture affects seedling growth and you plant seeds in soils with 3 different moisture values. What is your independent variable? *number of seeds
*soil moisture
*number of soil types

Answers

i would think that it would be (number of soil types)
the moisture in the soil.

Living things need small amounts of phosphorous in order to survive. What term describes phosphorous?

A.) macronutrient
B.) micronutrient
C.) anthropogenic
D.) non-essential

Answers

The term that describes phosphorous here is micronutrient. The correct option is B.

What is micronutrient?

Micronutrients are vitamins and minerals that the body requires in minute amounts.

Their impact on a body's health, however, is critical, and deficiencies in any of them can result in severe and even life-threatening conditions.

Micronutrients, also known as vitamins and minerals, are essential for healthy development, diseaseprevention, and overall well-being. Micronutrients, with the exception of vitaminD, are not produced by the body and must be obtained through diet1.

Micronutrients are primarily found in fruits and vegetables. Micronutrients can also be found in animalfoods.

Micronutrients are vitamins and minerals that play an important role in allowing the body to function properly.

As living things need small amounts of phosphorous in order to survive it is micronutrient.

Thus, the correct option is B.

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Answer:

B.) Micronutrient

Explanation:

I have the same test and this is the correct one.

Mengapa tumbuhan dan hewan langka perlu dilestarikan agar tidak punah?

Answers

1.agar tidak punah karena sudah jarang ditemukan
jika tidak dilestarikan akan punah .
akibat ulah manusia yang memburunya.

2.makhluk hidup berperan sebagai proses ekosistem yang membutuhkan
dan dibutuhkan  tumbuhan dalam prosesnya
yang menjadi saling menguntungkan.
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