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KE=3070.625 J

Height = 3.686 m

mass of bike+rider=85 kg

velocity = 8.5 m/s

[tex]\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 85\times 8.5^2\\\\KE=3070.625~J[/tex]

Conservation of energy :

(KE+PE)₁ (downhill) = (KE+PE)₂ (up the hill)

PE₁=0⇒h=0

KE₂=0⇒v=0(stop), so equation becomes :

KE₁=PE₂

[tex]\tt KE_1=3070.625\\\\KE_1=mgh_2\\\\3070.625=85\times 9.8\times h\Rightarrow h=3.686~m[/tex]

Answer:

Francium (Fr)

Explanation:

From the given choices, francium will have the lowest ionization energy.

Ionization energy is the energy required to remove the most loosely held electron within an atom.

The magnitude of the ionization energy depends on the characteristics of the atom in relation to its nuclear charge, atomic radius, stability etc.

Answer:

D.

Explanation:

Answer:

thermal energy

Explanation:

Answer:

Atoms often get electrons or lose. The atom lacks or earns a "negative" load. Then these electrons are known as ions. Positive ion - If the molecule lacks an electron, it gets more protons than ions.

Explanation:

Answer:

it may be helium according to my knowledge

Answer: The bubbles produced are most likely due to oxygen.

Explanation:

Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.

The balanced chemical reaction for photosynthesis is:

[tex]6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2[/tex]

Thus the bubbles produced are most likely due to oxygen.

Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

Answer: 1, magnesium & mg

2, two energy shells

Explanation:

C. Aluminum (Al) oxidized, zinc (Zn) reduced

Given

Metals that undergo oxidation and reduction

Required

A galvanic cell

Solution

The condition for voltaic cells is that they can react spontaneously, indicated by a positive cell potential.

[tex]\large {\boxed {\bold {E ^ ocell = E ^ ocatode -E ^ oanode}}}[/tex]

or:  

E ° cell = E ° reduction-E ° oxidation  

For the reaction to occur spontaneously (so that it E cell is positive), the  E° anode must be less than the E°cathode

If we look at the voltaic series:

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The standard potential value(E°) from left to right in the voltaic series will be greater, so that the metal undergoing an oxidation reaction (acting as an anode) must be located to the left of the reduced metal (as a cathode)

From the available answer choices, oxidized Al (anode) and reduced Zn (cathode) are voltaic/galvanic cells.

Answer:

C. a Pe X  Apporved

Explanation:

Trust

Answer:

A.6

Explanation:

An atom of carbon can share four electrons. Carbon has a total of six electrons, with two in the first orbital and four in the second orbital.

Answer:

Astatine is of interest as a cancer therapy because it is one of several elements that emit an α particle—a combination of two protons and two neutrons—when it decays.

Explanation:

Answer: d

Explanation: I want paying attention ngl hahahaha

When excess stomach acid is treated with milk of magnesia, Mg(OH)2 a chemical reaction takes place in your stomach. In this neutralization reaction, the products are  a salt and water.

In a chemical reaction known as neutralization, an acid and a base interact quantitatively. By neutralizing a reaction in water, surplus hydrogen or hydroxide ions are removed from the solution.

This reaction's general equation is NaOH + HCl H2O and NaCl. To better understand how each product develops, let's divide this reaction into two sections. Water is created when negative hydroxide ions from NaOH and positive hydrogen ions from HCl mix.

Salt and water are created when an acid and a base react. Since salt and water are both neutral, any reactions between acids and bases result in their neutralization. As a result, it is known as a neutralization reaction.

Thus, option B is correct.

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Answer:

C

Explanation:

Interference trust me I just did this

A light wave bends to pass through a crack underneath a door, this represents interference. The correct option is option C.

Like other waves, light waves also transfer energy to a source. They are made up of tiny energy particles known as photons. While photons have no mass, they do have momentum and energy.

There are types of light waves which human eyes cannot perceive, just as there are noises that can't be recognized because they fall outside the range of human hearing. However, all forms of waves share characteristics like wavelength and frequency. Wavelength is the separation between neighboring wave components (e.g., crest to crest or trough to trough). A light wave bends to pass through a crack underneath a door, this represents interference.

Therefore, the correct option is option C.

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Given :

The atomic number of Arsenic (As) is 33.

The average atomic mass is 74.92 amu.

To Find :

A neutral arsenic atom will have protons.

Solution :

We know, atomic mass is the sum of number of protons and neutrons.

Also, atomic number is the number of protons present in an atom.

Therefore, a neutral arsenic atom will have 33 protons.

Answer:

OC energy

Explanation:

Answer:

Very reactive metals, such as aluminium, form stable oxides and other compounds. Electrolysis is commonly used to extract these metals and requires a lot of electric current (energy) to reduce them to extract the metal. Less reactive metals, such as iron, form less stable oxides and other compounds.

Explanation:

Brainliest please?

Electrolysis is the strategy by which electric flow is gone through a substance to impact a synthetic change.

This method is used to extract metals.

Electrolysis is the process in which electrons are being added to metal particles at the negative electrode. The disadvantage (especially in the aluminum case) is the expense of the power. A benefit is that it can deliver extremely unadulterated metals.

Find more information about Electrolysis here:

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Answer:

The water supply is not safe.

Explanation:

Ionically, the reaction is;

Pb^2+(aq) + 2Br^-(aq) -------> PbBr2(s)

Amount of Br^- reacted = 2/1000 * 0.12 = 2.4 * 10^-4 moles

From the reaction equation;

1 mole of Pb^2+ requires 2 moles of Br^- for complete precipitation

x moles of Pb^2+ requires 2.4 * 10^-4 moles of Br^-

x = 1 * 2.4 * 10^-4 /2

x = 1.2 * 10^-4 moles of Pb^2+

Concentration of Pb^2+ precipitated from 5ml of tap water =  1.2 * 10^-4 * 1000/5

Concentration = 2.4 * 10^-2 M

The amount of  Pb^2+ found in the water is greater than the maximum allowable concentration of Pb2+ ions in water in a local community which is 1.51 x 10-8 M. Therefore, the water supply is not safe.

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question we have

[tex]P_2 = \frac{80000 \times 250}{0.75} = \frac{20000000}{0.75} \\ = 26666666.6666 \\ = 26666667[/tex]

We have the final answer as

Hope this helps you

Answer:

Most of the time, nonmetals will form four covalent bonds in order to achieve a stable octet.

Answer:

A molecular formula tells us what atoms and how many of each type of atom are present in a molecule.

Explanation:

If only one atom of a specific type is present, no subscript is used.

For atoms that have two or more present, a subscript is written after the symbol for that atom.

Molecular formulas do not indicate how the atoms are arranged in the molecule.

- Hope this helps! -blazetoxic123

In a molecular formula, the subscripts represent the number of atoms of each element present in a molecule.

The molecular formula gives you the specific combination and quantity of atoms that make up a single molecule of a compound.

For example, consider the molecular formula of water, which is H₂O:

"H" represents hydrogen.

"O" represents oxygen.

The subscript "2" next to "H" indicates that there are two hydrogen atoms in one molecule of water.

The absence of a subscript next to "O" means that there is only one oxygen atom in one molecule of water.

So, the molecular formula H₂O tells us that a water molecule is composed of two hydrogen atoms and one oxygen atom bonded together.

Here are a few more examples to illustrate the importance of subscripts in molecular formulas:

Methane: CH₄ (One carbon atom and four hydrogen atoms)

Carbon dioxide: CO₂ (One carbon atom and two oxygen atoms)

Ethanol: C₂H₅OH (Two carbon atoms, six hydrogen atoms, and one oxygen atom)

The subscripts are crucial in distinguishing between different compounds with the same elements. For instance, carbon monoxide (CO) and carbon dioxide (CO₂) have different molecular structures and properties, even though they both contain carbon and oxygen. The subscripts in the molecular formula help to specify the unique arrangement of atoms within each molecule.

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Answer:

During exercise, heart rate can rise dramatically, from a resting rate of 60–80 beats per minute to a maximum rate of about 200 for a young adult. While you are running, blood flow is diverted toward tissues that need it most. For example, muscles in the arteries in your legs relax to allow more blood flow.

Explanation:

Answer:

the more physical activity you do the higher your heart rate rises

Explanation:

me every time I walk more then two steps honestly

Prevailing winds bring air from one type of climate to another. For example, warm winds that travel over water tend to collect moisture as they travel; the water vapor in the air will condense as it moves into colder climates, which is why temperate coastal areas often receive heavy rainfall.

Hope it Helps! T^T

Answer:

we need a picture in order to help you. if you add a picture or text of what you want an answer to I can help!

Answer:

D. nose,trachea,bronchi,alveoli

Explanation:

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