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The pressure exerted by a 200 lb man wearing size 10 shoes, if the area of each shoe in contact with the floor is 20 square inches is about 5.77 Pa.

Pressure is the force exerted by unit area. Hence, as the force applied increases, pressure increases.

To calculate the pressure exerted by the man, we need to use the formula:

Pressure = Force / Area

where the force is the weight of the man, and the area is the total area of both shoes in contact with the floor.

First, we need to convert the weight of the man from pounds (lb) to Newtons (N), since the SI unit of force is the Newton. We can do this using the conversion factor:

1 lb = 4.44822 N

So, the weight of the man in Newtons is:

200 lb x (4.44822 N/lb) = 896.44 N

Next, we need to calculate the total area of both shoes in contact with the floor. Since the man is wearing size 10 shoes, we can estimate the area of each shoe to be:

Area per shoe = πr^2 = π(5 in)^2 = 78.54 in^2

So, the total area of both shoes in contact with the floor is:

Total area = 2 x 78.54 in² = 157.08 in²

Now we can calculate the pressure exerted by the man:

Pressure = Force / Area = 896.44 N / 157.08 in²

We need to convert the units of area from square inches (in²) to square meters (m²), since the SI unit of pressure is the Pascal (Pa) and 1 Pa = 1 N/m²:

Pressure = (896.44 N / 157.08 in^2) x (1 m^2 / 1550 in^2) = 5.77 Pa

Therefore, the pressure exerted by the man is approximately 5.77 Pa.

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The net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid is B. Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq)

This is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid. The balanced equation for this reaction is NaF (aq) + HCl (aq) → NaCl (aq) +HF (aq).

The net ionic equation is derived by canceling out the spectator ions, which are ions that don't participate in the chemical reaction. In this case, Na+ and Cl- are spectator ions, which means that they don't participate in the reaction and are present in the same form on both sides of the equation. Therefore, they are cancelled out, leaving the net ionic equation Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq).

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k = -1/(slope of plot) is the correct answer to identify the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t).

Therefore, the rate constant can be determined by finding the slope of the plot and then using the formula k = -1/(slope of plot)

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Answer:

because it's water chemical bonds form when atoms share electrons and example of a chemical compound is water a water molecule forms when oxygen and hydrogen atoms react and are held together by covalent bonds like other compounds water always has the same chemical composition a ratio of two one of hydrogen atoms to oxygen atoms

The reason of why the chemical composition of water should be the same should be explained below.

Since it contain the water chemical bond at the time when the atom should share electrons.

And the example of the chemical compound represent the water that shows the water molecule created at the time when the oxygen and the hydrogen reacted and it could be together via the covalent bonds.

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Answer:

400.58

Explanation:

Standard pressure is 1atm/760 mm Hg

760-359.42= 400.58

Answer:

salt and hydrogen gas

Explanation:

acid + metal = salt + hydrogen

Answer:

hope this helps

Explanation:

hydrogen gas

An acid will react with a metal to form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is as follows: acid + metal → salt + hydrogen.

Answer:

its D. potassium and chromium

Answer:

option d

Explanation:

potassium and chromium

It is false that the broad bands or regions located around the nucleus where the electrons are found are called energy rings.

The nucleus is the centre of an atom. Protons and neutrons are particles that make up the nucleus. Shells of electrons rotate around the nucleus. The atom is made up of a small nucleus surrounded by electrons that move. The nucleus includes protons, with a positive charge equivalent to the negative charge of an electron. Neutrons, which have almost the same mass but still no charge as protons, may also be found in the nucleus.

The nuclear powerful force extends long enough from each baryon to bind protons and neutrons together while repelling the repelling electrical force between positively charged protons. The nuclear force acting has a relatively narrow range and practically vanishes just beyond the nucleus's border.

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Measuring tools like Clear ruler, yardstick, measuring tape etc. They are very useful for the perfect fit and shape of any garment and even home furnishing.  

Sewing is the craft of fastening or attaching objects using stitches which is made up of a sewing needle and thread.

Measuring tools are the instruments used by practitioners and researches to aid in the assessment or evaluation of the subjects, clients or patients etc. These instruments are used to measure or collect the data on a variety of variables ranging from psychosocial wellbeing or physical functioning.

Measuring tools in sewing are as follows: Measuring tape, clear ruler, quilting ruler, yardstick, French curve etc.

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A) Sodium is the element that will produce a new compound when added to a beaker containing an aqueous solution of copper (II) sulfate ().

When sodium is added to an aqueous solution of copper (II) sulfate, a new compound is formed.

This reaction is known as a displacement reaction and occurs when the sodium ions take the place of the copper ions in the solution.

As the sodium ions bond with the sulfate ions, they form sodium sulfate and free copper ions, which can then be extracted from the solution. This reaction is a great example of how chemical reactions can produce new compounds and materials.

This chemical reaction illustrates how certain substances can interact to create new substances with different properties.

Although a part of your question is missing, you might be referring to this question:

Which element will produce a new compound when added to a beaker containing an aqueous solution of copper (II) sulfate ()?

a) Sodium

b) Berrylium

c) Manganese

d) none of the above

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Answer:

your answer is B, your graph is constant from there, therefore the pattern is uniform (orderely).

Answer:

b) energy can accomplish work

Explanation:

As the air gets warmer it rises because,  particles spread out making it less dense. The diffusing capability of gas molecules make it possible.

Intermolecular force are the force that keep the particles of a substance binded together. Gaseous molecule easily diffuse in air , since the intermolecular attraction is very less in them.

In solid state molecules are densely packed and difficult to move apart. In liquid state , particles have some space to move and in gases molecules are far apart due to less intermolecular force.

As the gas molecules in air absorbs heat energy, they overcome all the intermolecular forces and will spread out in the air. Thus, they rises above over a temperature gradient.

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Irony of situation is a discrepancy between the expected result and actual results. Irony involves the perception that things are not what they are said to be or what they seem.

One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.

Here,

The irony of the issue is the difference between the expected and actual results. Irony is the impression that things are not what they appear to be or what they are purported to be.

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Answer:

they were facing the oppisite ways

Explanation:

Answer:

Yes, she will be able to recover enough magnesium chloride from the original flask to continue the experiment

Explanation:

The solution prepared by the scientist contains 12.7g of magnesium chloride. The sunlight will evaporate only the water present. When the volume decreases, the magnesium chloride precipitates. When all water evaporates, all the solute, magnesium chloride precipitates totally.

That means she will recover the 12.7g of magnesium chloride.

Answer: Yes, she will be able to recover 12.7g in the flask

Explanation: Founders Educere answer

A fossil that has 6.25% of its carbon atoms is still unstable.

Carbon-14 dating is a method of determining the age of organic material. Measures the amount of carbon-14 (a radioactive isotope of carbon) present in the sample. The half-life of carbon-14 is 5,730 years. This means that after 5,730 years, half of the carbon-14 atoms in the sample have decayed to nitrogen.

If 6.25% of the fossil carbon atoms are unstable, this means that 93.75% of the carbon-14 atoms in the sample have already decayed. To determine the age of a fossil, the following formula can be used:

Age = (half-life x ln(1-(fraction of decayed carbon-14/100))) / ln(2)

Age = ( 5,730 x ln(1 - (93.75/100))) / ln(2)

age = 11,460 years old

c. A fossil in which 75% of the atoms are STABLE.

If 75% of the fossil atoms are STABLE, this means that 25% of the carbon-14 atoms in the sample have decayed. The same formula as above can be used to determine the fossil age. 75 )) / ln(2)

Age = 23,120 years

Please note that these are approximate values, as the actual age of the fossils may be affected by various factors such as contamination, preservation, and measurement error.

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Answer:

The answer is 21.5 L

Explanation:

Anaerobic respiration results in the production of 2 ATP molecules.

Anaerobic respiration is the use of electron acceptors other than molecular oxygen in respiration. Despite the fact that oxygen is not the ultimate electron acceptor, the process employs a respiratory electron transport chain. When there is insufficient oxygen for some species to respire, they still require energy to survive. Due to a lack of oxygen, they respire in the absence of oxygen to create the energy they require, which is known as anaerobic respiration. While most aerobic respiration (with oxygen) occurs in the cell's mitochondria, anaerobic respiration (without oxygen) occurs in the cytoplasm.

Here,

Two ATP molecules are created during anaerobic respiration.

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Answer:

V2 = 5.8 L

Explanation:

T1 = 50°C = 323 K

V1 = 5L

T2 = 100°C = 373 K

V2 =?

According to Charles's law,

V1/T1 = V2/T2

---> V2 = (T2/T1)V1 = (373K/323K)(5 L)

= 5.8 L

Answer:

Moths are hunted and killed in a variety of ways. I'll explain how we go about hunting and killing moths.

Explanation:

Step-by-Step:

Obtain a sticky trap in the morning and afternoon. It's available at Target and Walmart. Cover it in moth pheromones or anything else you know will attract moths. They will be stuck in the sticky trap for a long time and will eventually die as a result of not being able to escape.

At night, get or buy a lamp and turn it on. This will attract a lot of moths and make them easier to see. Then spray the area with insecticide or insect repellent. Finally, they should perish.

Tip: If a large swarm of moths becomes too much for you to handle, call pest control and they will get rid of them for you!

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108°C is the final temperature of the water after absorption of 1680 Joules of heat energy.

Temperature is a physical quantity used to measure the average kinetic energy of molecules in matter. This is measured with a thermometer or other device that measures the average kinetic energy of the molecules within the substance. The terms Celsius (°C), Fahrenheit (°F), or Kelvin are commonly used to describe temperature (K). Temperature can affect the physical state of matter.

By rearranging the equation gives:

ΔT = q/mc

Plugging in the given values,

ΔT = 1680/ (80.0 g × 4.184 J/g·C)

= 98°C.

Since the initial temperature was 10°C, the final temperature is:

ΔT = T₂ - T₁

98°C = T₂ - 10

T₂ = 108°C

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Answer:

according to the Oxford dictionary, metallurgy the branch of science and technology concerned with the properties of metals and their production and purification

Explanation:

Explanation:

The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy.

Hey stan.

Hope it's help ^_^

Answer:

Two, I'd say, unless there's some trick to what you're asking! :)

Explanation:

Answer:

eleven

Explanation:

combine numbers together

1   +   1

1  + 1

1 + 1

1+1

11

--------------------------------------------------------

just kidding LOL

answer is 2

Answer:

52,000 kJ

Explanation:

The combustion reaction is the following:

2 C₂H₆(g) + 7 O₂(g) → 4CO₂(g) + 6H₂O(l)  ΔHm= –3120 kJ

From the chemical reaction and the value of ΔH we can see that 2 moles of ethane gas (C₂H₆(g)) release 3120 kJ of heat energy. So, we have the conversion factor: 3120 kJ/2 moles C₂H₆.

To calculate how many kJ are released from the combustion of 1 kg of ethane, we have to first convert the mass to moles by using the molecular weight (MW) of ethane (C₂H₆):

MW(C₂H₆) = (12 g/mol x 2 C) + (1 g/mol x 6 H) = 30 g/mol

mass = 1 kg x 1000 g/1 kg = 1000 g

moles of C₂H₆= mass/MW = 1000 g/(30 g/mol) = 33.3 mol C₂H₆

Finally, we multiply the conversion factor by the number of moles of C₂H₆ in 1 kg:

heat energy released = 33.3 mol C₂H₆ x 3120 kJ/2 moles C₂H₆ = 52,000 kJ

Therefore, 51,000 kJ are released when 1 kg of ethane is burned.

O copper of the following elements can be prepared by electrolysis of their aqueous salts

H+ ions are drawn to the cathode during the electrolysis of water, where they pick up electrons to create hydrogen gas. The oxygen gas is formed when OH-ions are drawn to the anode and lose their electrons.

Sodium chloride solution electrolysis is a significant industrial process. Chlorine gas is created at the positive electrode; hydrogen gas is created at the negative electrode; and an alkali is left in the solution as three valuable chemicals.

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4.6 is the pH of the juice if hydrogen ion concentration of a fruit juice is 2.5 x 10-5 M.

pH is the measure of acidity or alkalinity of a solution.

It is measured by taking negative logarithm of hydrogen ion concentration.

pH = -log [[tex]H^+[/tex]]

Given [tex][H^+][/tex] =  2.5 x [tex]10^-^5[/tex] M.

pH = -log [ 2.5 x [tex]10^-^5[/tex] M]

pH = 4.6

Hence, 4.6 the pH of the juice.

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