How does a helicopter fly ? ( I need it explained in the view of physics)

When you say full valence shell, are you talking about a valence electron shell?

I am learning about atoms and i know a little bit

Atoms in Group 18 elements are inert (chemically unreactive) because they have no valance electrons. The correct option is B.

In chemistry, an element's valence or valency is the measure of its ability to combine with other atoms to form chemical compounds or molecules.

The number of atoms of one element combined with one atom of another element to form a molecule is referred to as its valency.

Valency is also referred to as molecular weight. Valency is a measure of an atom's combining power. The number of electrons in an element's outermost shell determines its valency.

Because of their full valence shells, noble gases are unreactive. They do not easily gain or lose electrons because they are already in the most stable electronic configuration.

Thus, the correct option is B.

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Answer:

I think 75 m

Explanation:

tell if it was correct

Answer:

81.81 kg

Explanation:

[tex]m_1[/tex] = Mass of person = 78.4 kg

[tex]m_2[/tex] = Mass of canister

[tex]u_1[/tex] = Initial velocity of person = 0

[tex]u_2[/tex] = Initial velocity of canister = 3.5 m/s

[tex]v_1[/tex] = Final velocity of person = 2.4 m/s

[tex]v_2[/tex] = Final velocity of canister = 1.2 m/s

The momentum balance in the system is given by

[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\Rightarrow 78.4\times 0+m_2\times 3.5=78.4\times 2.4+m_2\times 1.2\\\Rightarrow m_2=\dfrac{78.4\times 2.4}{3.5-1.2}\\\Rightarrow m_2=81.81\ \text{kg}[/tex]

Mass of the canister is 81.81 kg.

Answer:

The weight of huifen is equal to 529.2 N.

Explanation:

Given that,

Mass of huifen = 54 kg

We need to find the weight of huifen. We know that, the weight of an object is given by :

W = mg

Where

g is acceleration due to gravity

Put all the values,

W = 54 × 9.8

W = 529.2 N

So, the weight of huifen is equal to 529.2 N.

Answer:

If you want the true weight of someone, you need to multiply mass by gravity which is 54*9.81 giving the calculation in Newtons and this would equal 529.74N

Explanation:

Answer:

 μ= 0.0375,  kinetic

Explanation:

For this exercise we set a reference system with the x axis parallel to the chord

Y axis  

      N - W = 0

      N = W

X axis

      T - fr = 0

the expression for the friction force is

      fr = μ N

we substitute

       T - μ W = 0

       μ = T / W

we calculate

         μ = 1.5 / 40

        μ= 0.0375

coefficient of kinetic friction

Answer:

The product choices along with its competitive prices were provided to the consumers. Practices such as horizontal collusion and resale price maintenance was declared unlawful in 1984. Prevention of monopoly growth was the aim of the competition policy act.

Explanation:

hope this helps you

Answer:

it will obviously be decreased by 40p

Answer:

En un proceso isotérmico, es decir, la temperatura no cambia, el trabajo puede escribirse como:

W = n*R*T*Ln(P1/P2)

Donde P1 es la presión inicial y P2 la presión final.

Donde las cantidades:

n =  número de moles

R = constante de los gases ideales

T = temperatura no cambian.

Y sabemos que la ecuación de la energía interna es:

U = C*n*R*T

Donde C es otra constante que depende del gas.

De aca, podemos concluir que ninguna de estas variables cambia en nuestro proceso, por lo que la variación de la energía interna es cero.

U2 - U1 = 0

b) Para el calor cedido o absorbido, la formula básica es:

ΔQ = C*(T2 - T1)

Donde ΔQ es el calor absorbido o cedido por el gas, C es una constante que depende del gas, T2 es la temperatura final del gas y T1 es la temperatura inicial del gas.

Como la temperatura no cambia en el proceso, entonces:

T2 = T1

ΔQ = C*(T2 - T1) = C*0 = 0

No hay calor absorbido ni cedido.

c) Podemos concluir que en un proceso isotérmico la energía interna no cambia, y no hay un intercambio de calor.

Solution :

Philosophy is idealism

The idealism is considered as a philosophical approach where the main belief is that 'ideas' are the only true realities and it is the only thing that is worth knowing.

Philosophy in cynicism

In cynicism philosophy, it is belief that the purpose of the life is to live in the virtue and in agreement with the nature. They are practiced by the cynics.

Philosophy in stoicism

Stoicism is a philosophy that hails from Rome and Greece. It beliefs in life that provides maximum positive emotions of the people, and it reduces negative emotions. they also believes that it helps people to hone their virtues of the characters.

Answer:

Explanation:

In the chloroplast, photosynthesis occur. The chloroplast capture light energy from the sun and use it with carbondioxide and water to produce glucose and oxygen. Chloroplasts is found in plant cells only

But mitochondria is refer as the power House of the cell. It's break down fuel molecules and produce energy in cellular respiration. Mitochondria is found in both plant and animal cell.

Answer:

the kinetic energy of the brick before it reaches the ground is 117.6 J.

Explanation:

Given;

mass of the brick, m = 2 kg

height of the building, h = 6 m

The kinetic energy of the brick before it reaches the ground is maximum.

Based on the principle of conservation of energy, the maximum potential energy = maximum kinetic energy

K.E = P.E = mgh

where;

g is the acceleration due to gravity = 9.8 m/s²

K.E = 2 x 9.8 x 6

K.E = 117.6 J

Therefore, the kinetic energy of the brick before it reaches the ground is 117.6 J.

Answer:

Horizontal

Explanation:

It is going more sideways than upwards

Answer: ​ It is an insidious, self-perpetuating problem that affects generations of families. ... Society can intervene to increase host resistance and mitigate poverty's negative ... prevention, quality, potentially avoidable hospital use, and health outcomes. ... These findings point out that low-income status does not have to determine poor

Explanation:

Answer:

D. Refracted

Explanation:

At the point when light passes from a less thick to a more thick substance, (for instance passing from air into water), the light is refracted (or bowed) towards the ordinary. The bowing happens on the grounds that light voyages all the more gradually in a denser medium. The answer is D, refracted.

Answer:

20V

Explanation:

Given: I=2A

           R=10Ω

Solution: V = I × R

                  =(2A)×(10ohm)

                  =20V

Answer:

A. kilometers

Explanation:

Answer:

[tex]F_w=1000Hz[/tex]

Explanation:

From the question we are told that:

Frequency [tex]F=1200[/tex]

Speed [tex]V_w= \frac{1}{5}*343=>68.6m/s[/tex]

Where speed of sound [tex]V_s=343m/s[/tex]

Generally the equation for frequency  that echo from the cliff wall is mathematically given by

[tex]F_w=\frac{V_s-V_0}{Vs+V_w}*F[/tex]

[tex]F_w=\frac{343-0}{343+68.6}*1200[/tex]

[tex]F_w=1000Hz[/tex]

[tex] \boxed{ \mathrm{Kinetic \: Energy = \frac{1}{2} m {v}^{2} }}[/tex]

_____________________________

[tex]\mathrm{ \#TeeNForeveR}[/tex]

Answer:

Work

Explanation:

Units are

[tex]kg {m}^{2} {s}^{ - 2} = newtons \times meter[/tex]

The given statement that explained the property of both light and sound is option a. They can be reflected.

Since the television generated the two types of the wave i.e. light and sound.

Also, the sound waves and the light waves should be reflected from the surfaces. So here the angle of incidence should be equivalent to the angle of reflection.

Therefore, the option a is correct.

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Answer: 3300 m/s

F = ma; units: N = kg(m/s/s); where F and a are both vectors, while m, t, and v (speed) are scalars

We are given the mass, force, and the time; however, speed is our unknown.

[F = 16500 N]  [m = 10 kg]  [t = 2 s]  [v = unknown]

What we can do is use kinematics in order to relate v and t with F and m:

For example, we can use V = V₀ + at

Since F = ma can equal a = F/m, we can replace the a variable within the kinematics equation with F/m, so that:

V = V₀ + at

V = V₀ + (F/m)t

In this problem, we can assume the initial value V to equal 0, giving us:

V = (F/m)t

Plugging in the quantities we get:

V = [tex]\frac{16500 N}{10kg}[/tex]· 2s

V = 3300 m/s

To further check whether this is the right manipulated equation to use, we can use dimensional anaylsis to determine that:

V = [tex]\frac{kg(m/s/s) }{kg}[/tex]· s

V = m/s

I hope this helped!

Answer: [tex]1.4\ \Omega[/tex]

Explanation:

Given

Cross-sectional area [tex]A=0.7\ mm^2[/tex]

Resistivity [tex]\rho =4.94\times 10^{-4}\ \Omega-mm[/tex]

Length of wire [tex]l=2\ m\ or\ 2000\ mm[/tex]

Resistance is given by

[tex]\Rightarrow R=\dfrac{\rho l}{A}\\\\\text{Insert values}\\\\\Rightarrow R=4.9\times 10^{-4}\times \dfrac{2000}{0.7}\\\\\Rightarrow R=1.4\ \Omega[/tex]

Answer:

There are 45 turns in the secondary coil.

Explanation:

Given that,

Input potential of the lamp, [tex]V_{in}=5\ V[/tex]

The output potential of the lamp, [tex]V_{out}=1.5\ V[/tex]

Number of turns in primary coil, [tex]N_P=150[/tex]

We need to find the number of turns needed on the secondary coil. We know that the ratio for a transformer is as follows :

[tex]\dfrac{V_{out}}{V_{in}}=\dfrac{N_s}{N_P}\\\\N_s=\dfrac{V_{out}N_P}{V_{in}}\\\\N_s=\dfrac{1.5\times 150}{5}\\\\N_s=45\[/tex]

So, there are 45 turns in the secondary coil.

When an object absorbs light energy, it reflects none of the colors. The correct option is B.

The change in direction of a wavefront at an interface between two different media so that the wavefront returns to the medium from which it originated is referred to as reflection. Reflection of light, sound, and water waves are common examples.

Objects appear different colors because they absorb certain colors (wavelengths) while reflecting or transmitting others. The wavelengths that are reflected or transmitted are what we see as colors.

If photon energy is absorbed, the energy from the photon is typically manifested as heating the matter.

Light absorption causes an object to become dark or opaque to the wavelengths or colors of the incoming wave: Wood is impervious to visible light.

Thus, the correct option is B.

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P = 7.3 × 10^-13 Watt

Explanation:

First of all, are you sure that what you have is the right answer?

Anyway, the definition of power dissipated is given by

P = I^2×R

where I is the current and R is the resistance. But we also know from Ohm's law that

V = IR

so we can rewrite the equation for power P as

P = I^2R = I(IR) = VI

= (0.0054 volt)(1.35 × 10^-10 A)

= 7.3 × 10^-13 Watt

Answer:

1. 300.15

2. 873.15

3. 221.95

1. -243.15

2. -210.85

3. 295.17

Daniel will earn $2.20 more a week because his pay increase will increase his pay from $8 to $8.40.

The crucial question to respond to is this one. When making your request for a raise, make a list of all the reasons why you desire one.

Don't ask for a raise because your rent increased or because you're annoyed that your coworker doesn't put in as much effort yet is paid the same as you.

Your request should be supported by arguments that are based on your performance and the value you provide to the team and the corporation.

After doing their annual performance review, which may occur at the beginning of the new year or at the conclusion of the first quarter of the year, businesses typically change the pay of their personnel.

Therefore, Daniel will earn $2.20 more a week because his pay increase will increase his pay from $8 to $8.40.

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