Which elements are not noble gases?
check all that apply
A.) Neon
B.) Helium
C.) Lithium
D.) Calcium

Answer:

Gravitational Force

Explanation:

The force of gravitation between the charged particle is the force which is being ignored by the scientist while studying the atom as it is very small in comparison to other forces in the atom

Explanation:

The gravitation force between the atoms are very small or you can say it is negligible to be taken into consideration, as the values as small as these procure errors and difficulties in calculation or derivation, therefore are being ignored by the scientist.

The gravitational force between the charged particles are extremely small due to the fact that it depends upon the masses of the object and masses of charged particles in the atom are small and so force is small too.

The statement is False. The force needed to overcome static friction is usually greater than that needed to overcome kinetic friction.

To understand why this is the case, let's first define static and kinetic friction. Static friction occurs when two surfaces are at rest relative to each other, while kinetic friction occurs when there is relative motion between the surfaces.

The force of friction [tex]\( F_f \)[/tex] can be calculated using the formula[tex]\( F_f = \mu \times N \)[/tex] , where [tex]\( \mu \)[/tex]  is the coefficient of friction and N is the normal force exerted perpendicular to the surfaces.

1. Static friction force [tex]\( F_{f\_static} = \mu_s \times N \)[/tex]

2. Kinetic friction force [tex]\( F_{f\_kinetic} = \mu_k \times N \)[/tex]

The coefficient of static friction [tex]\( \mu_s \)[/tex] is typically greater than the coefficient of kinetic friction [tex]\( \mu_k \), meaning \( \mu_s > \mu_k \).[/tex]

Let's assume a scenario where [tex]\( \mu_s = 0.6 \) and \( \mu_k = 0.4 \),[/tex] and the normal force [tex]\( N = 50 \)[/tex] N.

1. [tex]\( F_{f\_static} = 0.6 \times 50 = 30 \) N[/tex]

2. [tex]\( F_{f\_kinetic} = 0.4 \times 50 = 20 \) N[/tex]

In this scenario, the force needed to overcome static friction (30 N) is indeed greater than the force needed to overcome kinetic friction (20 N).

Static friction is generally higher than kinetic friction due to the microscopic irregularities and interlocking between surfaces at rest. When an object is at rest on a surface, these irregularities create a stronger bond that requires more force to break and initiate motion. Once the object starts moving (kinetic friction), the surfaces are no longer interlocked to the same degree, leading to lower frictional forces.

Therefore, the force needed to overcome static friction is usually greater than that needed to overcome kinetic friction.

Complete Question:
The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?​

Answer:The loudest of the two sound wave is second one

Explanation:because if shout the sound go high,then which one show you the highest the second one rigth

Answer:

c

Explanation:

Answer:

[tex]49.7^{\circ}[/tex]

Explanation:

We can solve the problem by using Snell's law:

[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]

where

n1 = 1.33 is the index of refraction of the first medium (water)

n2 = 1.00 is the index of refraction of the second medium (air)

[tex]\theta_1 = 35^{\circ}[/tex] is the angle of incidence of the wave in water

[tex]\theta_2[/tex] is the angle of refraction of the wave in air

Solving for the angle of refraction,

[tex]sin \theta_2 = \frac{n_1 sin \theta_1}{n_2}=\frac{(1.33) sin 35^{\circ}}{1.00}=0.763\\\theta_2 = sin^{-1} (0.763)=49.7^{\circ}[/tex]

Answer:

49.7

Explanation:

Answer:

U

Explanation:

The first law of thermodynamics states that:

[tex]\Delta U = Q-W[/tex]

where

U is the internal energy of the gas, which represents the sum of the chemical and thermal energy stored in the atoms and molecules of the gas

[tex]\Delta U[/tex] represents the variation of internal energy

Q is the heat absorbed by the system

W is the work done by the system

So, the sum of the chemical and thermal energy stored in atoms and molecules is represented by U, the internal energy.

Answer:

U APEX

Explanation:

Answer:

hot to cold

Explanation:

Heat will always flow from hot to cold substances.

Heat flows from "hot to cold" substances.

Explanation:

"Heat flows from hot to cold" is the statement of "Second Law of Thermodynamics".

According to this law, the heat flow is due to the collision of hot atoms collides with cold atoms transferring kinetic energy. When the heat flows from "hot to cold", external energy is not required for the flow, but when it flows from cold to hot, it needs external energy in which the spontaneity of heat flow is less.  

The answer is:

The voltage of the source is 8.40 Volts.

To solve the problem, we need to use the Ohm's Law equation, which states that:

[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]

From the statement we know that:

[tex]Resistance=2.21\Omega\\Power=32W\\Current=3.8A[/tex]

Now, substituting and calculating we have:

[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]

[tex]Voltage(Volts)=3.8A*2.21\Omega=8.40V[/tex]

Hence, we have that the voltage of the source is 8.40 Volts.

Have a nice day!

The G is represented as “Universal Gravitational constant” in the gravitational force equation acting between the two objects.

Explanation:

The force of gravitation is given by following equation, [tex] \bold{F= \frac{- G (M m)}{r^2}} [/tex]

F - Force of gravitation,

G - Universal gravitational constant,

M - Mass of [tex]1^{st}[/tex] object,

m - Mass of [tex]2^{nd}[/tex] object,

R - Distance between two objects.

The negative sign here denotes that gravitational force is experienced along the line of separation of the two objects. And it also indicates that it is an attractive force between the two.

Answer:

False

Explanation:

No. The buoyant force on an object is the portion of its weight that appears to vanish

when the object is in any fluid (could be either a liquid or a gas).

If the object happens to float in a particular fluid, then the buoyant force at that moment

is equal to the object's weight.

Notice that the buoyant force on an object will be different in different fluids.

Answer:

false

Explanation:

Answer:

specific heat

Explanation:

Specific heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance

Answer:

A. you push up on a barbell, and the barbell pushes you down

Explanation:

As per Newton's third law of motion, every action has an equal and opposite reaction. The point of action and reactionary force are same. If you analyze the options given only first option fulfills this condition.

As you push the barbell up, that means action is being done on the barbell using your hand and barbell pushes you down which means that the reaction force is acting on the same point.

In other options the action is done on one object and the other force is not acting on the same object but some other object.

Answer:

The answer is A.

Explanation:

At the instant the second bulb is connected ...

... the brightness of the first bulb doesn't change

... the brightness of the second bulb changes from dark (no brightness) to equal to the first bulb

When the second 20 Ohm bulb is added in parallel, the bulbs becomes brighter

Adding a second, identical 20 Ohm bulb in parallel with the first one will have the effect of increasing the brightness of the bulbs.

In a series circuit, the total resistance increases as more resistors are added, which reduces the current flowing through the circuit. As a result, the bulbs would be dimmer in a series circuit.

However, when the second 20 Ohm bulb is added in parallel, the total resistance decreases, allowing more current to flow through the circuit. This increased current results in a higher brightness of the bulbs.

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Answer:

there are no mutiple choices

Answer:

Redshift increases with distance

Explanation:

Edwin Hubble discovered a relation for distance and radial velocities of galactic nebulae from their redshifts i.e., when an object is moving away from earth the wavelength of light gets changed due to the Doppler effect.

He also found that two galaxies when further apart have a greater speed by which they are moving away from each other. This was used to prove the Big Bang theory laid down by Georges Lemaître.

Answer:

Their atoms have identical mass.

Explanation:

Oxygen-17 and Oxygen-18 are both isotopes of Oxygen.

Oxygen has three isotopes, Oxygen- 16, Oxygen-17 and Oxygen-18.

Oxygen- 16 has 8 protons and 8 neutrons and a mass number of 16.

Oxygen-17 has 8 protons and 9 neutrons and a mass number of 17.

Oxygen-18 has 8 protons and 10 protons and a mass number of 18.

The three isotopes therefore have the same atomic number ( the number of protons) but different mass numbers.

Answer:

it is a nation wide crisis

Explanation:

Answer:

The internet is always growing

Explanation:

Answer:

B. 22,22,23,23,22,22,23

Explanation:

The standard deviation is a measure of dispersion or variability of a data set. In order to determine the data set that has the smallest standard deviation, we shall investigate on the ranges of the data sets given. The range of a data set is simply the difference between the maximum and minimum values in a data set. A data set that has a smaller range also has a smaller standard deviation.

From the alternatives given, the data set given by alternative B has the smallest range and consequently the smallest standard deviation.

The maximum value is 23 while the minimum is 22. The range is 1.

Refraction is the bending of light as it passes from one medium to another, causing objects to appear shifted or distorted when viewed through lenses.

The wave interaction that occurs as light passes from the air into the plastic lenses of the sunglasses is refraction. Refraction is the bending of light as it passes from one medium to another due to the change in its speed. This bending of light is what makes objects appear shifted or distorted when viewed through lenses.

Answer:

B

Explanation:

This is an example of single replacement (or single displacement).  One element (in this case, C) replaces a similar element in a compound (in this case, the B in AB).

The correct option is b.

The given chemical equation represents a Single-displacement reaction where one element displaces another from a compound. Its occurrence is dependent on the reactivity of the free element.

The general equation AB + C --> AC + B is characteristic of a Single-displacement chemical reaction. In a single-displacement reaction, one element is displaced from its compound by another element. Here, element C displaces B from compound AB to form AC and release element B.

A crucial aspect of a single-displacement reaction is that the free element must be more reactive than the bound element for the reaction to occur. If C is more reactive than B, then the reaction ensues.

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Answer:

No, neutrons have about the same mass as a proton, but both have more mass than electrons.

Hope this helps a bit,

Flips

Answer:

Its 2.5

Explanation:

She moves at 5 m per 2 seconds so she moves at 2.5 m per second

The provided data is insufficient to calculate Daniela's velocity. This is because velocity not only considers the speed but also the direction. Therefore, information on Daniela's direction during the race is necessary for an accurate calculation.

Unfortunately, the question does not provide sufficient information to calculate Daniela's velocity. Velocity is a measure that describes how much distance an object covers in a particular direction in a given amount of time. To calculate this, we must know not just the speed (distance/time) but also the direction of travel. Without the necessary data regarding Daniela's direction of movement during her race, we cannot provide a precise velocity value.

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Answer:

A measurement standard is defined as 'the exact quantity people agree to use for comparison'.

Explanation:

For the same type of quantity, there is a unit of measurement which is defined and adopted either conventionally or by law which is used as standard for measurement of that quantity.

This measurement standard is defined as 'the exact quantity people agree to use for comparison'.

For example, for length the standard unit of measurement is 'meter'.

Answer:

is an object system or experiment that bears a defined relationship to a unit of measurement of a physical quality

the answer is A

metallic bonds are formed between metal ions

Answer:  C)  KClO3 → KCl + O2

Explanation:

the equation has an unequal amount of oxygen.

you can confirm because all the other equations are balanced so the answer is c

Answer:

[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]

(C) is correct option

Explanation:

Balanced equation :

In balanced equation, The number of atoms of each element in product side equal to the number of atoms of each element in reactant side.

The equation is not balanced in option C.

[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]

In this equation, The number of oxygen element in product side is not equal to the number of oxygen element in reactant side.

All equations are balanced.

Explanation:

White light is composed by a range of colors, this was discovered by Isaac Newton when he observed that a beam of white light was refracted (the different rays of light are diverted depending on their wavelengths) when passing through a prism .

This phenomenom was later called dispersion.

An observation from Newton's experiments with light is that white light separates into a range of colors when passed through a prism, revealing that white light is composed of different colors.

The statement that is an observation from Newton's experiments with light is "White light becomes a range of colors after passing through a prism." This observation comes from a series of experiments conducted by Isaac Newton in the seventeenth century, where he demonstrated that white light is not a single pure substance but is composed of many different colors.

Newton used a prism to separate sunlight into a spectrum of colors, and then recombined them with another prism to form white light again, proving that the colors were inherent in the white light and not a creation of the prism.

It will decrease in the same proportion.

Answer : The correct option is, D.

Explanation :

Activation energy : It is defined as the minimum amount of energy given to the reactant so that it gets converted into products.

Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.

In the endothermic reaction, the energy of reactant are less than the energy of product.

Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.

In the exothermic reaction, the energy of reactant are more than the energy of product.

From the given options we conclude that the energy diagram shows endothermic reaction because energy is absorbed from the surrounding.

Hence, the correct option is D.

The sun is the original source of solar energy, hydroelectric energy, food energy, coal energy, oil energy, and wind energy.

The sun is NOT the original source of nuclear energy. (b)​

Answer:

The answer is b. nuclear energy

Explanation:

Nuclear energy is a process through which electrical energy is generated by the disintegration of atoms from a material called uranium. The energy that uranium releases when its atoms disintegrate produces heat with which the water found in nuclear reactors is boiled to produce electricity.

Answer:

wavelength

Explanation:

its expressed in meters

Final answer:

The property expressed in distance units is wavelength (option B), symbolized by λ, and typically measured in meters.

Explanation:

The property that is expressed in distance units is B. wavelength. It is the distance between two corresponding points of a wave, such as the distance between the midpoints of two consecutive peaks or troughs. The symbol for wavelength is λ (lowercase Greek lambda), and the units used to describe wavelengths are typically meters (m). Frequency, denoted by ν (lowercase Greek nu), is the number of oscillations that pass a specific point in a given period of time, measured in hertz (Hz). Speed, the rate at which a wave travels through a medium, is expressed in meters per second (m/s). Period, the time it takes for one complete oscillation to occur at a fixed point, is measured in seconds (s).

Answer:

a car parked in a garage

Explanation:

where would a parked car go ? its not even in motion lol