What discovery did the study of fossil horse teeth lead scientists to make?


Early horses had a generalized diet of hard food items, including twigs.


Early horses had a specialized diet of grass, a soft food item.


Early horses had a specialized diet of bark, a hard food item.


Early horses had a generalized diet of soft food items, including leaves.

The voltage across the 200 ohm circuit element, that draws a current of 4 A, is equal to 800 volts.

To find the voltage across a circuit element, take Ohm's Law, according to which the resistance (R) of a resistor is equal to the product of the current (I) that flows through it and the voltage (V) across it.

Use the values:

Current (I) = 4 A

Resistance (R) = 200 Ω

Using the formula of Ohm's Law:

V = I × R

V = 4 A × 200 Ω

V = 800 V

Voltage is  800 V.

Thus, the voltage across the 200 ohm circuit element, that draws a current of 4 A, is 800 volts.

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Answer:

See explanation

Explanation:

I believe that the aim of the scientist is to determine the effect of a cancer drug on mice with lymphoma. In this experiment, the mice with lymphoma are exposed to the drug. This is the treatment in the experiment. A control group of mice having lymphoma is not exposed to this treatment, this is the control group. This control group establishes a baseline for the study.

By comparing the outcome of the experimental and control groups, the effect of a cancer drug on mice with lymphoma can be determined.

A near-azeotropic refrigerant blend is a mixture of two or more refrigerants that have similar boiling points and vapor pressures, resulting in a composition that behaves like a single fluid. These blends are designed to offer improved performance and efficiency compared to single-component refrigerants.

Two examples of near-azeotropic refrigerant blends are R-410A and R-404A.

R-410A is a blend of difluoromethane (R-32) and pentafluoroethane (R-125), which has replaced R-22 as a popular refrigerant for air conditioning systems due to its superior efficiency and environmental properties.

R-404A is a blend of tetrafluoroethane (R-134a), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-143a), which is commonly used in commercial refrigeration applications such as supermarkets and convenience stores.

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Explanation:

I first take back the numbers to their original forms that is to say (5.55×10^15) = 5550000000000000 and (8.88×10^18) = 8880000000000000000 therefore the difference of the two will be 887445 which is notated to (8.87445×10^5)

Answer: (8.87445×10^5)

Answer:

4.  0.5 kilometers (1st option)

5.  0.1 00 liters (last option)

Explanation:

500 meters to kilometers

4.

1 kilometer = 1000 meters

We use the formula SBD (SMALL TO BIG DIVIDE) i hope this helps you

500 ÷ 1000

= 0.5 kilometers

5.

100 milliliter to liter

SBD

100 ÷ 1000

= 0.1 00 liters

Answer:

cation

Explanation:

An atom with more protons than electrons is a cation. An atom with more electrons than protons is an anion.

Answer:

A Cation should be the correct answer.

Explanation:

It will become a positively charged ion, which is known as a cation. This is because it loses an electron, so it becomes positively charged.

Answer:

high melting points.

good conductors of electricity.

good conductors of heat.

high density.

malleable.

ductile.

Explanation:

Here is ur paragraph:

Metals have many interesting properties. Metals have high melting points, for example, Gold's melting point is 1948 degrees Fahrenheit. They are also good conductors of heat and electricity. They have high density and are malleable. They are also ductile. Platinum and Gold are very widely used for these reasons.

The answers to the given problem are monthly energy use of household in m3 of natural gas equivalent = 787.5 m³, Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe, CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).

1) Calculation of monthly energy use in m3 of natural gas equivalent:For every 1 kWh of electricity produced, the gas turbines consume 0.21 m³ of natural gas equivalent.

The consumption of natural gas equivalent can be calculated by multiplying the monthly average electric energy consumption by the quantity of natural gas equivalent that is consumed by gas turbines for every 1 kWh of electricity produced.

So, the monthly consumption of natural gas equivalent will be,

3750 kWh * 0.21 m³/kWh = 787.5 m³ of natural gas equivalent

Calculation of monthly energy use in kg of oil equivalent:

Assuming that natural gas has a calorific value of 55.5 MJ/m³, and that the conversion efficiency of natural gas turbine is 33%, the equivalent energy that will be produced from 1 m³ of natural gas is 55.5 x 0.33 = 18.315 MJ/m³.

In order to calculate the equivalent energy that will be produced from 787.5 m³ of natural gas, we can use the formula:

Equivalent energy = calorific value of natural gas x volume of natural gas x conversion efficiency

So, the equivalent energy that will be produced from 787.5 m³ of natural gas is,

Equivalent energy = 55.5 x 787.5 x 0.33

= 12337.3125 MJ

= 12.337 GJ

So, the monthly consumption of oil equivalent will be:

12.337 GJ / 41.868 = 0.29484627 ktoe (kilo tonnes of oil equivalent)

2) Calculation of CO2 footprint in kg:

Assuming the average CO2 emissions coefficient for gas fired power plants is 400 g/kWh.

The CO2 footprint in kg can be calculated by multiplying the monthly average electric energy consumption by the CO2 emissions coefficient of gas-fired power plants.

So, the CO2 footprint in kg will be:

3750 kWh x 0.4 kg/kWh = 1500 kgCO2 (i.e., 1.5 metric tonnes of CO2).

Therefore, the answers to the given problem are:

Monthly energy use of household in m3 of natural gas equivalent = 787.5 m³

Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe

CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).

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First, we have to remember the law of conservation of matter:

"The matter can not be created nor destroyed. It can only be transformed".

Then, the answer, in theory, has to be 11.0 g, that is the addition of 5.0 g and 6.0 g.

Answer:

Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3

Explanation:

It takes 0.4402 grams of magnesium to remove every copper (II) ion from the solution.

A substance's mole is equivalent to 6.022 x 1023 of that material (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 1023.

Mg(s) + Cu² (aq) → Cu(s) + Mg²(aq)

According to reaction , 1 mole of copper (II) ion reacts with 1 mole of magnesium solid .

Then 0.01834 moles of copper (II) ion will react with :

1 × 0.01834 mol = 0.01834 mol of magnesium

Mass of 0.01834 moles of magnesium :

0.01834 mol × 24 g/mol = 0.4402  g

0.4402 grams of Mg is needed to displace all of the copper (II) ions from the solution.

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The ionization constant Ka of the acid is 1 x 10^-7

Define weak acids .

When an acid cannot fully perform the dissociation process when dissolved in an aqueous solution, it is categorized as a weak acid. Formic acid and hydrofluoric acid are two examples of such acids.

Given:

Molarity = 0.10M

pH = 4

Consider acid as HA

Reaction can be written as HA ⇋  H+  + A-

Constant, Ka is [H+] [A]/ [HA]

Taking [H+]  and [A] as 'x'

Ka will be x*x/ 0.10-x

We know pH is -log[H]

[H] will be 10^-4 i.e 'x'

Ka will now become (10^-4 * 10^-4)/ 0.1-10^-4 i.e. 10^-7

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Answer:

The concentration is 50%

Explanation:

Mass-Volume concentration is molarity (M) times 100% or \(\frac{Gsolute}{Lsoln}\) * 100%

For this problem, we need to convert from milligrams to grams and milliliters to liters in order to plug the values into the equation and solve for the concentration.

So, 250 mg = 0.025g (there are 1000 mg in 1 g)

And 500ml = 0.05 L  (there are 1000 ml in 1 L)

Now we can solve for the concentration

\(\frac{0.025 g}{0.05 L}\) \(* 100\) %=  0.5 \(* 100\) % = 50% of Tylenol concentration

Answer:

The answer would be 4.5 moles of O2

Answer:

Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

plz can i get brainliest:)

The air molecules in the compressions of the second wave are denser, so the sound is louder.

Sound waves are longitudinal waves that travel through a medium like air or water.

In a closed room, Noah and Nina are sitting 15 m apart.

As Noah says the same sentence twice, Nina does not hear the sound the first time but she does hear the sentence the second time.

This happens as the air molecules in the compressions of the second wave are denser. As a result, the sound is louder.

The correct option is ''The air molecules in the compressions of the second wave are denser, so the sound is louder''.

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Answer:

526.85K

Explanation:

Based on Charles's law, the volume of a gas is directly proportional to absolute temperature. The formrula is:

V₁ / T₁ = V₂ / T₂

Where 1 represents the initial state and 2 the final state of the gas

Using the values of the problem:

V₁ = 10.0L

T₁ = 127°C + 273.15K = 400.15K

V₂ = 20.0L

Thus, replacing in the formula:

10.0L / 400.15K = 20.0L / T₂

T₂ = 800K

In Celsius:

800K - 273.15 = 526.85K

Answer:

single displacement

Explanation:

Answer: 581 Sn and 13 Sn

Explanation:

581 Sn and 13 Sn are both Sn which are the same element with different masses. Isotopes are same element with different masses and the elements can have different masses because of different number of neurons

Answer:

ummmmmmmmmmmmmmmm

Explanation:

Answer: well im taking the test right now. and i dont know so yah. good luck HAH

Explanation:

Answer:

The volume of hydrogen gas produced at s.t.p. is 9.419 dm³

Explanation:

The balanced chemical equation for the reaction is given as follows;

Zn + 2HCl → ZnCl₂ + H₂

Therefore, we have;

One mole of Zn reacts with 2 moles of HCl to produce one mole of ZnCl₂ and one mole of H₂

Number of moles of Zn present = 25/65 = 5/13 = 0.385 moles

Therefore, number of moles of H₂ produced = 0.385 moles

The volume of hydrogen gas produced is given by the relation

PV = nRT, we have;

R = 8.3145 J/(mol·K)

V = nRT/P = 0.385 ×8.3145 ×298.15/(101325)= 0.009419 m³ = 9.419 dm³

The volume of hydrogen gas produced at s.t.p. = 9.419 dm³.

Answer:

Any type of movement

Explanation:

All muscles are used for any way of movement in the body.

This is how many grams there are in 525 grams of calcium. One mole of calcium weighs 13.099 grams.

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Answer:

it dissolve faster in higher temperature hope it's right

Answer:

the answer is 4.9×10-10M

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of object = 50 mL

density = 20 g/mL

We have

mass = 20 × 50

We have the final answer as

Hope this helps you

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, which are not found within animal cells. The cell wall is a rigid covering that protects the cell, provides structural support, and gives shape to the cell.

Explanation:

MOST BRAINLIEST

A is the answer, because i mean that's just how you write out equations