For a general cosmological model, show that Ω
˙
i
​
=Ω i
​
H(Ω m
​
+2Ω r
​
−2Ω Λ
​
−1−3w i
​
), where i denotes matter, radiation or the vacuum. 15.30 By differentiating the definition Ω k
​
=−kc 2
/(R 2
H 2
), show that Ω
˙
k
​
=2Ω k
​
Hq=Ω k
​
H(Ω m
​
+2Ω r
​
−2Ω Λ
​
), where q is the deceleration parameter. 15.31 Show that the particle horizon at cosmic time t is given χ p
​
(t)= R 0
​
H 0
​
c
​
∫ 0
a(t)
​
Ω m,0
​
x+Ω r,0
​
+Ω Λ,0
​
x 4
+Ω k,0
​
x 2
​
dx
​

Answer:

H2O

Explanation:

Answer:

1=B

2=A

3=A

Explanation:

Any subsatance with a ph of less than 7 is acidic.

Bases measure over 7

Answer:Atoms seek to be stable; so, to get to a more stable state, the atom expels energy from the nucleus in the form of a particle or ray. This process is known as radioactivity, the unstable atom is said to be a radioactive atom, and the energy that's released is radiation

Explanation: so B

Answer:

p=5.0g/cm³

Explanation:

density formula

p=m/v

And if im not mistaken the stone weighs 200grams

The Volume of the tube increases by 40

So

p=200/40

p=5.0g/cm³

The volumes that are equal to one liter are 1 dm and 1000 cm and can be seen in Option B and D respectively. The information below shows the calculation to arrive at the answer.

Dimensional analysis can be defined as the method of conversion from one given unit to another. It is often required to deal with measures that are extremely small (e.g size of an atom) or extremely big, In such circumstances, a conversion between metric measuring units is typically essential.

We are to determine which volumes in the given option are equal to 1 Liter.

Following the International System of Units (SI);

a.

10° nl = 10 nanoliters

10 nanoliters = 1 × 10⁻⁸ Liters

∴

It is incorrect

b.

1 dm = 1 cubic decimeter

1 cubic decimeter is equivalent to 1 Liter.

∴

Option B is correct

c.

10 ml = 10 milliliters

10 milliliters = 0.01 Liter

∴

Option C is incorrect

d.

1000 cm = 1000 centimeters

1 cm = 0.001 Liter

∴

1000 cm =  1 × 0.001 Liters

1000 cm =  1 Liters

Option D is correct

e.

100 dL = 100 deciliters

1 deciliter = 0.1 Liters

∴

100 deciliters = 10 Liters

As such, this option is also incorrect.

Therefore, we can conclude that Only Option B and D are the volumes that are equal to one Liter.

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A certain reaction has an activation energy of 58.74 kj/mol. At 507 kelvin temperature, the reaction proceed 7.00 times faster than it did at 337 k.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Kelvin scale (K), which is mostly used for scientific purposes, the Fahrenheit scale (°F), and the Celsius scale, which has the unit symbol °C.

1/T2 - 1/T1 = -Ea/(R×ln(k2/k1))

1/T2 - 1/T1 = -Ea/(R×ln7)

T2 = 1/(1/T1 - Ea/(Rln(7)))

T2 = 1/(1/337 - 58.74/(8.314×1.94591)) = 507 K

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1. White Women was not excluded from the original construction of the American political system. The correct option is (A) White Women.

Among the groups that were not excluded from the original construction of the American political system were white women, wealthy land-owning white males, and, to some extent, formerly enslaved blacks. Native Americans, on the other hand, were excluded and treated as second-class citizens.

2. Libertarianism emphasizes the idea that the government should take a "hands-off" approach in most if not all matters of economic prosperity. The correct option is (C) Libertarianism. Libertarianism is a political ideology that emphasizes the importance of individual freedom, limited government intervention, and free-market capitalism. It is an ideology that is diametrically opposed to socialism and believes that the government should not interfere in people's lives unless it is absolutely necessary.

3. The Iroquois Confederacy played a role in the development of the U.S. Constitution and the American Political System. The correct option is (B) The Iroquois Confederacy. The Iroquois Confederacy, a native North American tribe, was known for its confederate government system, which inspired the U.S. Constitution's framers.

The idea of a representative government, checks and balances, and the division of powers were all influenced by the Iroquois Confederacy.

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Answer:

well tbh it's just the microwave doing its job heating up your Mac n cheese. But while doing so the Mac n cheese absorbs a lot of heat and then releases it by popping.

Answer:

I don't know

Explanation:

so true though

Answer:

9 is clay, silt, sand in that order

Explanation:

Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.

Clay, sand, plus silt are the three minerals that make up loam soil. Loam is the best soil for growing plants when mixed in the appropriate amounts. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.

In loam soil, little will grow without the latter two. The ideal combination of clay, sand, plus silt will provide the void where minerals, organic materials, water, and air may support life. Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Basalt transforms into clay-like soil, whereas granite decomposes into silty sands.

Therefore, loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand.

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Answer:

45 meters

Explanation:

Did the math

Answer:

Final volume = 0.39 L

Explanation:

V1P1 = V2P2

V2= V1P1/P2

V2= (1.76×1.58)/7.08

V2 = 0.39 L

The average kinetic energy of a mole of Kr at 273.0 K, assuming ideal gas behavior, is 3411.33 J/mol.

To calculate the average kinetic energy of a mole of Kr at 273.0 K, we need to use the following equation:

K.E. = (3/2) * R * T

where K.E. is the kinetic energy per mole, R is the gas constant, T is the temperature in Kelvin, and (3/2) is the average kinetic energy of a molecule in an ideal gas.

The value of R is 8.314 J/mol*K, and the temperature is 273.0 K. Substituting these values into the equation, we get:

K.E. = (3/2) * 8.314 J/mol*K * 273.0 K

K.E. = 3/2 * 2274.22 J/mol

K.E. = 3411.33 J/mol

Therefore, the average kinetic energy of a mole of Kr at 273.0 K, assuming ideal gas behavior, is 3411.33 J/mol.

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A gas occupies a volume of 14. 5 L at 230 K. Option (C), 17.4 K will the temperature be it the gas expands to 21.8 L.

The relationship between the temperature, volume, and pressure of a gas is described by the ideal gas law, PV = nRT, where P is the pressure, V is the volume. We are given the initial volume and temperature of the gas and we are asked to find the final temperature when the gas expands to a different volume. The ideal gas law is an equation of state of a gas, which describes the relationship between the pressure, volume, and temperature of a gas. We are given V1, T1, and V2. The number of moles and pressure are not given so we can consider them constants.

The equation is :

V1/T1 = V2/T2

T2 = T1(V1/V2)

T2 = 230 K (14.5L / 21.8L) = 17.4 K

So the temperature will be 17.4 K if the gas expands to 21.8L.

Therefore, the correct answer is 17.4 K (Option C).

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The Gas Laws are a set of physical principles that describe the behavior of gases under different conditions. These laws were first developed by scientists in the 18th and 19th centuries, and they have since been used to explain and predict a wide range of phenomena related to gases.

The Gas Laws include Boyle's Law, Charles's Law, Gay-Lussac's Law, and the Combined Gas Law. Boyle's Law states that the pressure of a gas is inversely proportional to its volume, while Charles's Law states that the volume of a gas is directly proportional to its temperature. Gay-Lussac's Law states that the pressure of a gas is directly proportional to its temperature, and the Combined Gas Law combines these three laws to describe the behavior of gases under various conditions.
In the Phet Gas Laws lab, students can experiment with different gases and conditions to see how these principles work in practice. They can observe changes in pressure, volume, and temperature, and use these observations to make predictions about the behavior of gases in different situations.
Overall, the Gas Laws are essential to our understanding of the physical world around us, and they have numerous applications in fields such as chemistry, physics, and engineering. By studying and applying these laws, scientists and engineers can develop new technologies and improve existing ones, helping to solve a wide range of real-world problems.

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Answer:

The chemical energy in food can be converted to another form of chemical energy when it is stored as glucose or fat. It can be converted to thermal energy because our body produces heat when digesting our food. The chemical energy in our food can also be converted to mechanical energy in the form of muscle movement.

PUT IN YOUR OWN WORDS!!!

The limiting reagent is NO and the mass of NO₃ formed in the reaction is 1.38 grams

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and they determine the amount of product formed in a reaction.

2O₃ + 3NO → 3NO₃

From the balance equation 2 moles of trioxide reacted with 3 moles of nitrogen monoxide to produce 3 moles of nitric oxide.

molarity (O₃) = 7.40 / 48 = 0.15416666666 moles

molarity(NO) = 0.670 / 30.01 = 0.02232589136 moles

Therefore,

O₃  :  NO

 2  :  3

Therefore, the limiting reagent is NO. It will completely be used before the reaction comes to an end.

3(30.1) g of NO produces 3(62) g of NO₃

0.670 g of NO will produce ?

cross multiply

mass of NO₃ formed = 0.670 × 186 / 90.3 = 124.62 / 90.3 = 1.38006644518 = 1.38 grams.

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Answer:

uhm

Explanation:

The smallest unit of life that can sustain itself is called an organism.

An organism is a living entity that is composed of one or more cells, which are the basic structural and functional units of life. These cells are capable of carrying out all the necessary processes for the organism's survival, including metabolism, growth, reproduction, and response to stimuli. An organism can exist as a single-celled or multi-celled entity, and can range in size from microorganisms like bacteria to large mammals like elephants. The biosphere is the term used to describe the global ecological system that encompasses all living organisms and their interactions with each other and their physical environment. A population is a group of individuals of the same species living in a specific geographic area.

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The molality of the solution that contains 16.32 g of glucose is calculated as 0.180 m.

Molality can be defined as number of moles of solute per kilogram of solvent. To find the molality of the solution, we need to calculate number of moles of glucose and the mass of the solvent.

Molar mass of glucose (C6H12O6) is: 6 x 12.01 + 12 x 1.01 + 6 x 16.00 = 180.18 g/mol

Number of moles of glucose is: n = m / M = 16.32 g / 180.18 g/mol = 0.0905 mol

Mass of water is 505.0 g.

The molality is: molality = moles of solute / mass of solvent in kg

mass of solvent = 505.0 g = 0.5050 kg

molality = 0.0905 mol / 0.5050 kg = 0.1795 mol/kg

molality = 0.180 m

Therefore, the molality of the solution is 0.180 m.

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Answer:

of course A

Explanation:

1.89*10³

1890

Answer:

Saliva and teeth in this order

Explanation:

Make me BRANLIEST please

From the idea of the Bohr model, each of the electrons would emit a characteristic  wavelength thus four wave lengths are emitted.

We know from the Bohr model that when an electron jumps from a higher to a lower energy level, there is the emission of light of the appropriate wavelength.

Now we know that the energy that is evolved is what determines the wavelength of the light since the wavelength is inversely proportional to the energy that is evolved by the electronic transition.

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A 14-year-old adolescent girl, Alice, has been diagnosed with anorexia nervosa. In the assessment of Alice, the findings that are more commonly associated with anorexia nervosa are Dysmenorrhea, decreased body temperature, and Heat intolerance.

Dysmenorrhea: Anorexia nervosa can lead to hormonal imbalances and disruptions in the menstrual cycle, which can cause irregular or absent periods (amenorrhea) and sometimes dysmenorrhea (painful periods).

Decreased body temperature: Anorexia nervosa can lead to lower body weight and reduced body fat, which can result in a lower body temperature. This is a physiological response to conserve energy and maintain the body's functions.

Heat intolerance: Anorexia nervosa can affect the body's ability to regulate temperature properly, leading to increased sensitivity to heat or cold. Individuals with anorexia may feel more discomfort or intolerance in extreme temperatures.

Hence,  the findings that are more commonly associated with anorexia nervosa are explained above.

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Answer:

In a .3M KNO3 solution, the KNO3 is dissolved in water. Water is the solvent and KNO3 is the solute, because the solute is what is dissolved. Also, all potassium compounds and nitrate compounds are soluble, so you know that KNO3 dissociates into K+ and NO3- in water.

Work done by a student who used the machine to lift a load of 150 kg through a distance of 2.5cm is 61.25 J.

Given,

Efficiency of machine in decimal= 60% = 0.6

Weight of load = 150 Kg

Distance must be in meters = 2.5cm = 0.025m

Using the formula,

Efficiency = work output/ input work

Work done is unknown.

work output = Force × Distance

Force can be calculated = m × g = 150 × 9.8 = 1470 N

work output = 1470 × 0.025 = 36.75 J

Work done = work output / Efficiency

= 36.75 / 0.6

= 61.25 J

Therefore, work done by student to lift that load is 61.25 J.

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The dissociation curve of hemoglobin is influenced by various factors, including the partial pressure of carbon dioxide, temperature, pH, and the presence of 2,3-DPG.

High partial pressure of carbon dioxide (CO2): An increase in the partial pressure of carbon dioxide shifts the dissociation curve to the right. This is known as the Bohr effect. Elevated CO2 levels indicate increased metabolic activity or higher levels of carbon dioxide produced during respiration. The shift to the right allows for more efficient release of oxygen from hemoglobin in tissues where oxygen demand is high.

Increasing temperature: An increase in temperature also shifts the dissociation curve to the right. Higher temperatures typically occur in metabolically active tissues, where oxygen demand is increased. The shift to the right enhances the unloading of oxygen from hemoglobin, facilitating oxygen delivery to the tissues.

Decreasing pH (acidic conditions): A decrease in pH, resulting in increased acidity (e.g., during exercise or in tissues with high metabolic rates), causes a rightward shift of the dissociation curve. This phenomenon is also known as the Bohr effect. The decrease in pH decreases the affinity of hemoglobin for oxygen, facilitating oxygen unloading in acidic environments.

Presence of 2,3-Diphosphoglycerate (2,3-DPG): 2,3-DPG is a molecule that is present in red blood cells and helps regulate the affinity of hemoglobin for oxygen. Higher levels of 2,3-DPG, which can occur in conditions such as chronic hypoxia or anemia, shift the dissociation curve to the right. This shift allows for more efficient unloading of oxygen from hemoglobin, ensuring that oxygen is delivered to tissues in need.

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