The source of the centripetal force that arises when a runner rounds a curve on a track is _____.tension
friction
weight
gravity

B. The generator transforms the mechanical energy of the turbine into electrical energy.

Note that a generator uses mechanical energy to turn the wire loop in the magnetic field. This causes electric current to flow, creating electrical energy.

Answer: Option (C) is the correct answer.

Explanation:

An atom consists of three subatomic particles which are protons, neutrons and electrons.

The protons and neutrons are present inside the nucleus. Whereas electrons revolve around the nucleus.

Whenever there is a bond formed by loss, gain or sharing between any two atoms then it is due to the electrons.

Hence, we can conclude that atoms may be bonded together by losing, gaining, or sharing electrons.

Answer:

λ =  

Explanation:

Using the De Broglie equation, the characteristic wavelength is given by:

λ =

where

h = Planck's constant = Js.

p = momentum

Momentum, p, can be calculated using:

p =  

where

m = mass of the electron = kg

E = Energy of the electron = 13.4 keV = J = J

=> p =

p =

p = kgm/s

Therefore, characteristic wavelength, λ, is:

λ =  

λ =  

In physics, the characteristic wavelength is the wavelength associated with an object's kinetic energy. It can be determined using the equations for energy, frequency, and wavelength.

In physics, the characteristic wavelength refers to the wavelength associated with a moving object's kinetic energy. The kinetic energy of an object is given by 1/2mv², where m is the mass of the object and v is its speed.

When an object's kinetic energy is known, we can use the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the wave associated with the object, to find the characteristic wavelength.

The equation is rearranged to solve for f, and then the frequency is used to calculate the wavelength using the formula λ = c/f, where λ is the wavelength and c is the speed of light.

By plugging in the given values of the object's mass and speed, you can determine its characteristic wavelength using these equations.

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The periodic table is a tabulated organization and representation of chemical elements that classify elements similar to repeating characteristics and order them by their increasing atomic number.

The periodic table is structured into:

• rows known as periods and;
• columns usually called groups.

The groups are categorized from group 1 (known as the alkali metals) to group 18 (i.e. the noble gases)

The list of the two most reactive groups are:

• Alkali metals and;
• The halogen family

1. Alkali metals i.e the group 1 metals are one of the two metals with the highest reactivity.  This is owing to their greater atomic radii and lower ionization energies, among other factors. They exhibit an oxidation state of +1 and typically donate electrons in reaction with the halogen family thereby resulting in the formation of an ionic bond. They also have lower boiling and melting points than other elements and are less dense.
2. The halogen family which is the other group of the most reactive elements on the periodic table is distinguished by their electronegativity characteristics. i.e. their ability to attracts electrons to themselves. They are located in group 7 on the periodic table.

Thus, we can conclude that the two most reactive groups of elements in the periodic table are the alkali metals and the halogen family.

Learn more about the periodic table here:

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Answer:

A change is said be chemical change when a change in chemical property of a substance occurs and the new substance is chemically different from old one. A change is said to be physical change when only physical properties change but chemically the substances remain same.

a) adding sugar to lemonade- It is a physical change because sugar is being dissolves in the lemonade. There is no change in the chemical property.

b) plants using CO₂ and H₂O to form O₂ and sugar is a chemical change because new products which are chemically different are formed.

c) boiling water - is a physical change because only the physical state from liquid to gas changes. Chemically water retains its properties.

d) frying an egg - the properties of egg changes after frying. Hence, it is a chemical change. A fried egg does not retain properties of an uncooked one.

e) rust forming on metal- is a chemical change. Corrosion ( rusting) is a chemical change as rust is chemically different from the metal.

f) fruit rotting - is a chemical change. When microbes act on the fruit, the fruit starts to rot.

g) removing salt from water by evaporation- it is a physical change. The salt and water retain their physical properties as mixture and when separated by evaporation process.