Mention three bodies/organizations that need electricity 24 hours​

From the given data the focal distance for the given concave mirror is +30 cm.

The focal distance, f, for a concave mirror, can be determined using the mirror formula:

1/f = 1/v - 1/u

Where:

f is the focal distance,

v is the image distance,

u is the object distance.

In this case, the object distance, u, is given as +15 cm (in front of the mirror), and the image distance, v, is given as +30 cm (in front of the mirror). We can substitute these values into the mirror formula:

1/f = 1/30 - 1/15

Simplifying the equation, we get:

1/f = (2 - 1) / 30

1/f = 1/30

f = 30 cm

Therefore, the focal distance, f, for this concave mirror is O +30 cm.

In conclusion, the focal distance for the given concave mirror is +30 cm.

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The approximate tangential speed of an object orbiting the Earth with a radius of 1.8 × 10^8 m and a period of 2.2 × 10^4 s is c. 7.7 × 10^4 m/s.

Orbital speed (v) is the velocity an object needs to remain in an orbit around another body.

The formula for orbital speed is:

v = 2πr / T,

where v is orbital speed, r is the radius of the orbit, and T is the period of the orbit.

In this case, the radius is given as 1.8 × 10^8 m, and the period is

2.2 × 10^4

s.π ≈ 3.14v

= (2πr) / T

= (2 × 3.14 × 1.8 × 10^8) / (2.2 × 10^4)

= (6.28 × 1.8 × 10^8) / (2.2 × 10^4)

= 51,430.91 m/s

≈ 7.7 × 10^4 m/s.

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Thus, we can conclude that during 1993-2015, thermal expansion contributed more to the sea-level rise compared to the input of freshwater (i.e., the melting of ice).

Between thermal expansion and the input of freshwater, the larger contributor to sea-level rise from 1993-2015 was thermal expansion. During the period from 1993 to 2015, the sea-level rise was measured at 3.4 millimeters per year. Melting of land ice such as ice sheets and glaciers contributed 1.2 millimeters per year of this sea-level rise. This means that thermal expansion contributed approximately 2.2 millimeters per year. Therefore, the larger contributor to sea-level rise from 1993-2015 was thermal expansion.

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The head loss per unit length of the flow is obtained by the use of the Darcy-Weisbach equation which is expressed as hf = f (L/D) (V^2/2g), where hf is the head loss, f is the friction factor, L is the length of the pipe, D is the diameter of the pipe, V is the mean velocity of flow, and g is the acceleration due to gravity.

Calculate the Reynolds number first which is defined as the ratio of inertial forces to viscous forces and is expressed as Re = ρVD/μ where ρ is the density, V is the velocity, D is the diameter, and μ is the kinematic viscosity of the fluid given.

Re = (ρVD/μ) = (0.9*0.01*3/0.007) = 38.57.

The fluid is characterized by a Reynolds number of less than 2300, thus it is laminar.

Using the Moody diagram, for a laminar flow regime, we have that f = 16/Re = 16/38.57 = 0.4144.

Substituting the values for L, D, V, g, and f, we get

= f (L/D) (V^2/2g)hf = (0.4144) (1) (0.01^2/(2*32.2))hf = 0.00000079 ft/ft.

Let's round the value to 8.0 × 10^-7 ft/ft.

Hence, the head loss per unit length of this flow is 8.0 × 10^-7 ft/ft.

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Answer:

c.large amplitude waves have less matter than small amplitude waves

Therefore, the minimum box size for this switch will be 2.5 cubic inches, while the recommended size is at least 18 cubic inches for a 14-gauge wire. However, the calculated box volume is 13 cubic inches. Hence, the box size required will be greater than 13 cubic inches.

In order to determine the box size for a 3-way switch in the bedroom hallway leading into the living room, the calculation needs to be done. Also, the box contains cable clamps.

So, here is how to determine the box size for this switch:

Calculation:

Firstly, we need to calculate the box volume. For that, we need the formula:

Box volume = Number of wires x 2 + Box fill volume Box fill volume is 2.0 cubic inches for each 14-gauge wire or 2.25 cubic inches for each 12-gauge wire or larger plus clamps for each box.

The box size of switch can be found out as follows:

The minimum box size for a three-way switch is 2.5 cubic inches.

However, the National Electrical Code recommends at least 18 cubic inches for a 14-gauge wire or 20 cubic inches for a 12-gauge wire.

The volume of the cable clamps is also to be included in the calculation. So, let's say the wire gauge used is 14-gauge.

Then,

the box volume = (2 x number of wires) + (2.0 cubic inches for each 14-gauge wire x number of wires) + volume of cable clamps.

Let the number of wires be 3 and the volume of each cable clamp be 0.5 cubic inches.

The calculation will be as follows:

Box volume = (2 x 3) + (2.0 x 3) + (0.5 x 2) = 6 + 6 + 1 = 13 cubic inches.

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Answer:

potential energy

Explanation:

Answer:

theroy of plate tectonics

Answer:

I belive is the answer is B. It is a material found in nature that people can use. Because water is technically a natural resource.

The vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.

Part (a) The vertical center of mass of the disk with the hole will be located at the same height as the center of the original disk, which is the same as the height of the center of the hole.

Therefore, the vertical center of mass of the disk with the hole is located at a distance of zero from the center of the disk.

Part (b) The horizontal center of mass of the disk with the hole will be located at the same horizontal position as the center of the original disk, since the hole is symmetrically placed with respect to the center.

Therefore, the horizontal center of mass of the disk with the hole is located at a distance of zero from the center of the disk.

Part (c) The total mass of the disk with the hole can be calculated by subtracting the mass of the removed portion (the hole) from the mass of the original disk.

The mass of the original disk is equal to its area multiplied by the area density, σ. The area of a circle is given by πR^2, so the mass of the original disk is πR^2σ.

The mass of the removed portion is equal to the area of the hole (πr^2) multiplied by the area density, σ. Therefore, the total mass of the disk with the hole is:

M = πR²σ - πr²σ

 = σπ(R² - r²)

Part (d) The horizontal center of mass of the disk with the hole can be calculated using the concept of moments.

The moment of an infinitesimally small element of mass, dm, about a reference point is given by dm * r, where r is the perpendicular distance from the reference point to the element of mass.

To find the horizontal center of mass, we need to calculate the sum of these moments for all the infinitesimally small elements of mass in the disk and divide it by the total mass.

In this case, the reference point is the center of the disk. Since the hole is centered at the same point, the perpendicular distance, r, for all the elements of mass is zero.

Therefore, the moment for each element of mass is zero. As a result, the horizontal center of mass of the disk with the hole is also located at a distance of zero from the center of the disk.

Part (e) The center of mass of the disk with the hole coincides with the center of the disk in both the vertical and horizontal directions. Therefore, the position of the center of mass from the center of the disk is (0, 0) cm.

In conclusion, the vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.

The total mass of the disk with the hole can be expressed as M = σπ(R² - r²). The position of the center of mass from the center of the disk is (0, 0) cm.

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Answer:

The two types of waves are longitudinal and transverse

Explanation:

hope it helped! and i hope its correct

Answer:

V2=809.44 mL

Explanation:

If ans is correct give a comment or ask for explanation with me .

The relative speeds of the two objects at the bottom of the incline will be zero.

In segment 1, the object is released from rest at the top of an inclined plane. As it rolls down the incline, the potential energy is converted into both kinetic energy and rotational energy.

Assuming no slipping occurs, the object's linear velocity increases while its angular velocity remains constant.

During segment 2, where no frictional force is exerted, there are no external forces acting on the object. As a result, there is no change in the object's kinetic energy or angular velocity. Therefore, the object's linear velocity remains constant.

At the bottom of the incline, both objects will have the same linear velocity. Since they are identical objects, the relative speed between them will be zero.

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--The complete Question is, For another identical object initially at rest, no frictional force is exerted during segment 2. If the first object is released from rest at the top of an inclined plane in segment 1, and both objects roll down the incline, what will be the relative speeds of the two objects at the bottom of the incline?--

Answer:

a. Work done = 313.92 Joules

b. Work done = 439.49 Joules

Explanation:

Work done = Force x distance

Where: Force = mass x gravity

Thus,

Work done = Force x gravity x distance

The earth's acceleration to gravity = 9.81 m/[tex]s^{2}[/tex].

a. The work done as it goes from B to A can be determined as;

work done = 4 x 9.81 x 8

                  = 313.92 Joules

b. The distance between A and C is the total horizontal distance covered from A to C.

i.e 8 + 3.2 = 11.2 m

The work done as the ball goes from point A to C can be determined as:

work done = 4 x 9.81 x 11.2

                  = 439.488

work done = 439.49 Joules

The difference in speed that occurs when a student sits in a fixed position on a boat and throws an object to the right with a velocity V while the boat moves to the left at a velocity that is much slower than the object's velocity can be explained as follows:

When the student throws the object to the right with a velocity V, the boat moves to the left due to the conservation of momentum. This movement of the boat to the left is very small, and its velocity is much slower than that of the object. When the object is in flight, the velocity of the student and the boat is the same as it was before the object was thrown to the right.The difference in speed between the boat and the object is due to the conservation of momentum. The boat and student move in the opposite direction with a velocity that is much smaller than that of the object.

The momentum of the object is equal to its mass multiplied by its velocity, and this momentum must be conserved. When the object is thrown to the right, the momentum of the object is transferred to the boat and the student.

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Therefore, the longest wavelength λ_water of the light in water that is transmitted most easily to the diver is c / (1.5f).The answer cannot be found as the frequency f is not given in the problem.

Given, Thickness of the oil slick, t = 200 nm Index of refraction of oil,

n = 1.5Speed of light in vacuum, c = 3 x 10^8 m/s.

We can determine the longest wavelength λ_water of the light in water that is transmitted most easily to the diver using the relation below:

λ_wavelength = λ_0 / (n + sin(θ))

Where λ_0 is the vacuum wavelength, n is the refractive index of oil, and θ is the angle of incidence. Let's assume that the angle of incidence,

θ = 0, since the light is coming directly from the water surface to the oil slick.

The refractive index of water, n_ w = 1.33.

We can rewrite the equation as follows:

λ_wavelength = λ_0 / (n + sin(θ))

λ_wavelength = λ_0 / (1.5 + sin(0))

λ_wavelength = λ_0 / 1.5

λ_wavelength = (c / f) / 1.5 where f is the frequency of the wave.

Substituting the given values, we get;

λ_wavelength = (3 x 10^8 m/s / f) / 1.5

Since the wave travels at the same frequency in both the oil and water, we can equate the velocity in oil with that in water to find the vacuum wavelength:

1.5 * c / f = v_ water / f

where v_ water is the velocity of light in water.

So,

λ_wavelength = c / (1.5 * f)

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Hence, the direction of plane's velocity relative to the ground is at 34.08° with the East or 90 - 34.08 = 55.92° with the North. Thus, the correct option is D. Due East

The direction plane's velocity relative to the ground, The given data is: Airplane velocity relative to air = 150 km/h, Wind velocity = 125 km/h. Direction of wind velocity = East,

Using Pythagoras theorem, we can calculate the magnitude of the plane's velocity relative to the ground. Let Vp be the velocity of the plane relative to the ground and let theta be the angle between the velocity vector and the horizontal velocity vector (east).

Then the component of velocity of the plane in the East direction is given by

cos(theta) × Vp, and the component of velocity of the plane in the North direction is given by sin(theta) × Vp.

Using the given data and equation of relative velocity, the velocity of the plane with respect to the ground is:

Vp = √(150² + 125²) km/h

Vp= √(22500 + 15625) km/h

Vp= √(38125) km/h= 195.04 km/h.

So the speed of the airplane relative to the ground is 195.04 km/h.

We have to find out the direction plane's velocity relative to the ground. In order to find the direction of the plane's velocity relative to the ground, we have to find the angle of the plane's velocity relative to the East (horizontal) direction.

Using the components of velocity and taking the inverse tangent, we get:θ = tan⁻¹(sin⁻¹(125/195.04))= tan⁻¹(0.6414)= 34.08°

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The correct answer is Option a. The angle of friction, Ø', can be determined using the formula:

Ø' = tan^(-1)(τ'/σn)

where Ø' is the angle of friction, τ' is the shear stress, and σn is the normal stress. In this case, the shear stress can be calculated by dividing the shear force at failure (300 N) by the area of the specimen. The area is the product of the specimen's height (25 mm) and its average perimeter [(2 * 63 mm) + (2 * 25 mm)].

Ø' = tan^(-1)(300 N / (25 mm * [(2 * 63 mm) + (2 * 25 mm)]) / 105 kN/m^2

Simplifying the equation:

Ø' = tan^(-1)(0.0256) ≈ 1.47°

b. To determine the shear force required to cause failure for a normal stress of 180 kN/m^2, we can use the formula:

τ' = Ø' * σn

Given Ø' = 1.47° and σn = 180 kN/m^2:

τ' = 1.47° * 180 kN/m^2 = 2.646 kN/m^2

c. The principal stresses at failure can be calculated using the equation:

σ1 = σn + τ'
σ3 = σn - τ'

Given σn = 180 kN/m^2 and τ' = 2.646 kN/m^2:

σ1 = 180 kN/m^2 + 2.646 kN/m^2 = 182.646 kN/m^2
σ3 = 180 kN/m^2 - 2.646 kN/m^2 = 177.354 kN/m^2

d. The pole on the Mohr's circle represents the average normal stress (σn) and is located at (σn, 0). Since σn = 180 kN/m^2, the pole would be located at (180 kN/m^2, 0).

To find the angle of inclination of the major and minor principal plane with the horizontal, we can use the equation:

θ = (1/2) * tan^(-1)((2 * τ') / (σ1 - σ3))

Given τ' = 2.646 kN/m^2, σ1 = 182.646 kN/m^2, and σ3 = 177.354 kN/m^2:

θ = (1/2) * tan^(-1)((2 * 2.646 kN/m^2) / (182.646 kN/m^2 - 177.354 kN/m^2))

Simplifying the equation:

θ ≈ 1.05°

Therefore, the angle of inclination of the major and minor principal plane with the horizontal is approximately 1.05°.

In conclusion, the angle of friction (Ø') is approximately 1.47°. For a normal stress of 180 kN/m^2, the shear force required to cause failure is approximately 2.646 kN/m^2. The principal stresses at failure for this condition are σ1 = 182.646 kN/m^2 and σ3 = 177.354 kN/m^2. The pole on the Mohr's circle is located at (180 kN/m^2, 0), and the angle of inclination of the major and minor principal plane with the horizontal is approximately 1.05°.

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Developing good work habits is essential for professional success and personal growth. Here are five commendable work habits:

1. Trustworthiness: Being trustworthy builds strong relationships with colleagues and clients. It involves fulfilling commitments, maintaining confidentiality, and being honest and transparent.

2. Initiating Collaboration: Allowing others to start and actively participating in collaborative efforts fosters teamwork and encourages diverse perspectives. It shows respect for colleagues' expertise and encourages collective problem-solving.

3. Dependability: Demonstrating reliability and consistency in meeting deadlines and delivering quality work builds trust and credibility. Being dependable ensures that others can rely on you and reduces stress within the workplace.

4. Efficiency: Striving for efficiency maximizes productivity and minimizes wasted time and resources. Effective time management, prioritization, and streamlining processes contribute to a productive work environment.

5. Punctuality and Courtesy: Being punctual demonstrates respect for others' time and sets a positive example. Additionally, practicing courtesy, such as using polite language, active listening, and showing appreciation, promotes a harmonious and respectful workplace.

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Answer: 4276.2 calories

Explanation:

Given

mass of steam is 6 gm at [tex]100^{\circ}C[/tex]

Conversion of steam to ice involves

Calories released during the conversion of steam to water at [tex]100^{\circ}C[/tex]

[tex]E_1=mL_v\quad [L_v=\text{latent heat of vaporisation}]\\E_1=6\times 533=3198\ cal.[/tex]

Calories released during the conversion of water at [tex]100^{\circ}C[/tex] to water at [tex]0^{\circ}C[/tex]

[tex]E_2=mc(\Delta T)\quad [c=\text{specific heat of water,}1\ cal./gm.^{\circ}C]\\E_2=6\times 1\times 100=600\ cal.[/tex]

Calories released during the conversion of water to the ice at [tex]0^{\circ}C[/tex]

[tex]E_3=mL_f\quad [L_f=\text{latent heat of fusion}]\\E_3=6\times 79.7=478.2\ cal.[/tex]

The total energy released is

[tex]E=E_1+E_2+E_3\\E=3198+600+478.2=4276.2\ cal.[/tex]

As the temperature increases, the kinetic energy of the molecules also increases.

The relationship between the kinetic energy of molecules in an object and the object's temperature is that as the temperature increases, the kinetic energy of the molecules also increases.

This relationship is governed by the kinetic theory of gases, which states that the temperature of a gas is directly proportional to the average kinetic energy of its molecules.

Temperature is a measure of the average kinetic energy of the particles in a substance. When the temperature of an object increases, the molecules within it gain more energy and move faster.

As a result, their kinetic energy increases. Conversely, when the temperature decreases, the molecules lose energy and their kinetic energy decreases.

The kinetic energy of a molecule is directly related to its mass and velocity. As the temperature increases, the molecules move with greater speed and collide more frequently with each other and the walls of their container.

These collisions transfer energy, leading to an overall increase in kinetic energy.

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The net work done on the box is 432 Joules. we can use the formula:

Net work = Change in kinetic energy.

To find the net work done on the box, we can use the formula:

Net work = Change in kinetic energy

The change in kinetic energy can be calculated using the formula:

Change in kinetic energy = (1/2) * mass * (final velocity^2 - initial velocity^2)

Given:

Mass of the box (m) = 3.00 kg

Acceleration (a) = 3.0 m/s^2

Time (t) = 8.0 s

Initial velocity (v₀) = 0 m/s (since the box starts from rest)

First, we can calculate the final velocity (v) using the kinematic equation:

v = v₀ + a * t

v = 0 + (3.0 m/s^2) * (8.0 s)

v = 24.0 m/s

Now we can calculate the change in kinetic energy:

Change in kinetic energy = (1/2) * m * (v^2 - v₀^2)

= (1/2) * (3.00 kg) * ((24.0 m/s)^2 - (0 m/s)^2)

= (1/2) * (3.00 kg) * (576 m^2/s^2)

= 432 J

Therefore, the net work done on the box is 432 Joules.

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The oil drop has an excess of 4 electrons when the potential difference between the plates is 360 V.

The excess charge on the oil drop can be determined by equating the electric force on the oil drop with the gravitational force acting on it. The electric force is given by Coulomb's law:

Felectric = qE,

where Felectric is the electric force, q is the charge, and E is the electric field.

The gravitational force on the oil drop is given by:

Fgravity = mg,

where Fgravity is the gravitational force, m is the mass of the oil drop, and g is the acceleration due to gravity.

Since the oil drop is at rest, the net force on it is zero:

Felectric - Fgravity = 0.

Substituting the expressions for the electric and gravitational forces:

qE - mg = 0.

Solving for the charge q:

q = mg/E.

We are given that the mass of the oil drop is 2.9 × 10^(-15) kg, the potential difference between the plates is 360 V, and the electric field E is related to the potential difference by E = V/d, where d is the separation between the plates (1.2 cm = 0.012 m).

Substituting the values:

q = (2.9 × 10^(-15) kg × 9.8 m/s^2) / (360 V / 0.012 m).

q ≈ 6.4 × 10^(-19) C.

Since the charge of a single electron is approximately 1.6 × 10^(-19) C, we can calculate the number of excess electrons:

Number of excess electrons = q / (1.6 × 10^(-19) C).

Substituting the value of q:

Number of excess electrons ≈ (6.4 × 10^(-19) C) / (1.6 × 10^(-19) C).

Number of excess electrons ≈ 4.

The oil drop has an excess of 4 electrons.

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Answer:

6 m/s

Explanation:

momentum= mass times velocity

120 = 20v

v = 120/20

Answer:

7

Explanation:

7

a. u is harmonic for let u(x, y) = xy because ∂²u/∂x² + ∂²u/∂y² = 0.

b. A harmonic conjugate of u is v = (x² - y²)/2.

To determine that u is harmonic, we need to verify whether u satisfies Laplace's equation or not. Laplace's equation is given by:

∂²u/∂x² + ∂²u/∂y² = 0

On differentiating u(x, y) = xy partially, we get,

∂u/∂x = y∂u/∂y = x

On differentiating partially again, we get,

∂²u/∂x² = 0∂²u/∂y² = 0

Therefore, ∂²u/∂x² + ∂²u/∂y² = 0

Thus, u is harmonic.

To find a harmonic conjugate of u, we need to find v(x, y) such that u + iv is analytic. In other words, v must satisfy the Cauchy-Riemann equations. The Cauchy-Riemann equations are given by:

∂u/∂x = ∂v/∂y∂u/∂y = -∂v/∂x

On substituting u = xy in the above equations, we get,

∂v/∂y = x∂v/∂x = -y

On integrating the above equations, we get

v = (x² - y²)/2 + C

Thus, a harmonic conjugate of u is v = (x² - y²)/2.

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When the image of an object is seen in a plane mirror, the distance from the mirror to the image depends on the distance from the object to the mirror.

It is because a Plane Mirror is the incident ray, the reflected ray, and the normal to the surface all lie in the same plane, and the angle of incidence is equal to the angle of reflection. So, the distance from the object to the mirror equals the distance from the image to the mirror. Thus whoever the person viewing this image must sight at this image location.

The acceleration is constant in a scenario, the quadratic function f(x) = ax2 + bx + c will describe the shape of the position vs time graph.

When the acceleration, a||, is constant in a scenario, the function that describes the shape of the position vs time graph is the quadratic function.

The quadratic function is a function that is second-degree, which means that its highest power is 2, and it has the form of f(x) = ax2 + bx + c. A quadratic function is the function that best describes the position vs. time graph because it has a constant acceleration a and velocity v that increases linearly with time t, meaning that its position increases quadratically with time t.

Therefore, when the acceleration is constant in a scenario, the quadratic function will describe the shape of the position vs time graph.

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