An electric kitchen range has a total wall area of 1. 40 m2 and is insulted with a layer


of fiber glass that has a temperature of 175oC and its outside surface is 35 oC. The


fiber glass has a thermal conductivity of 0. 040 Wm-1K-1
. Calculate the rate of flow of


heat through the insulation, assuming the fibre as a flat slab of area of 1. 40 m2

An atom’s location on the periodic table provides information such as;

1. Atomic number.

2. Number of valence electrons.

3. Atomic weight.

An atom can be defined as the smallest unit which comprises the matter that forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter and as such determines (defines) the structure of a chemical element.

Generally, atoms are typically made up of three (3) distinct particles and these are;  

Periodic table is an organized tabular array of all the chemical elements arranged in order of increasing atomic number (in rows).

Generally, an atom’s location on the periodic table (the group of elements it belongs to) provides information such as;

1. Atomic number.

2. Number of valence electrons.

3. Atomic weight.

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Subduction zones are associated with convergent boundaries.

option C is the correct answer.

Subduction zones are plate tectonic boundaries where two plates converge or meet together, and one plate is pushed below the other plate due to underlying forces.

The following are characteristics of subduction zones;

Subduction zones is usually associated with some geo-hazards, such as;

Thus, we can conclude that the main feature or characteristics of subduction zones is convergent boundaries resulting from the convergent plates.

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Answer:

the equilibrant is equal in magnitude but opposite in direction.

Explanation:

In vector algebra, a resultant vector is a single vector that have the same effect as the effect of the net or algebraic sum of two or more vectors.

A resultant vector arises from finding the adding multiple vectors together.

When a group of vectors is replaced by a resultant vector, in order to keep the system of vectors at equilibrium, there is another vector which has the same magnitude as the resultant vector but acting in opposite direction to the resultant vector. This vector is called the equilibrant.

Answer:

Explanation:

Battery is removed so its charge stored  becomes fixed .

Energy of capacitor E₁ = Q² / 2C

When dielectric is inserted , the capacity of the capacitor is increased to KC .

Charge on it still remains the same ie Q

So its new energy

E₂ = Q² / 2 KC

E₂ / E₁ = 1 / K

E₂ = E₁ / K

Change in energy

= E₂ - E₁

= E₁ / K - E₁

= E₁ [ (1 / K)  - 1 ]

Factor by which energy is changed

= [ (1 / K)  - 1 ] .

The presence of heavy elements in stars correlates with their positions because these elements show which star formed first, and a star's brightness and spectral type show where it is in the galaxy.

Heavy elements are present in population I stars. It is concentrated in the discs of spiral galaxies and typically contains the sun. It is also hot, youthful, and brilliant. The majority of them are found in spiral arms. In globular clusters and the outer galactic halo, where the concentration of heavy elements is relatively low, population II stars are born. The important information to compare the locations of the stars is therefore their abundances of heavy metals. Energy must be added in order for elements heavier than iron and nickel to develop.

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To find the inductance (L) of the solenoid, we can use the formula:L = (μ₀ * N² * A) / l, where μ₀ is the permeability of free space (4π × 10^(-7) T·m/A), N is the number of turns, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.

Given:

Radius of the solenoid, r = 2.30 cm = 0.023 m,

Number of turns, N = 640,

Length of the solenoid, l = 25.0 cm = 0.25 m.

The cross-sectional area of the solenoid, A, can be calculated as:

A = π * r²

 = π * (0.023)²

 ≈ 0.001663 m².

Now we can calculate the inductance:

L = (μ₀ * N² * A) / l

  = (4π × 10^(-7) * 640² * 0.001663) / 0.25

  ≈ 0.133 mH.

Therefore, the inductance of the solenoid is approximately 0.133 mH.

To find the rate at which the current must change through the solenoid to produce an emf (ε) of 70.0 mV, we can use Faraday's law of electromagnetic induction:ε = -L * (dI/dt), where ε is the induced emf, L is the inductance, and (dI/dt) is the rate of change of current.

Given:

Inductance, L = 0.133 mH = 0.133 × 10^(-3) H,

Induced emf, ε = 70.0 mV = 70.0 × 10^(-3) V.

Rearranging the equation, we can solve for (dI/dt):

(dI/dt) = -ε / L

         = -(70.0 × 10^(-3)) / (0.133 × 10^(-3))

         = -70.0 / 0.133

         ≈ -526.32 A/s.

Since the question asks for the magnitude of the rate of change of current, the answer is approximately 526.32 A/s.

Therefore, the magnitude of the rate at which the current must change through the solenoid to produce an emf of 70.0 mV is approximately 526.32 A/s.

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Answer:

False

Explanation:

i got it right

The statement is false. Because, the place where, it is easy to hear soft voices is acoustically good. Acoustically strong rooms facilitates the sound waves of even soft pitches.

Acoustics is the study of sound waves. Engineers strictly consider the concepts of acoustics to design the auditoriums and theater rooms to filter the sound effects in perfect pitches.

The frequency of a sound wave is called pitch. Thus lower frequency waves are lower pitch and they are termed as soft voices. Soft voices are hard to hear.

However, building where  it is very easy to hear soft voices is acoustically good room. Therefore, the statement is false. The building is good in acoustics suitable for sound effects.

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Answer:

D. Power is the product of voltage and current.

Explanation:

Electrical power is derived from the product of current and voltage;

  Power  = current x voltage  = I V

I is the current

V is the voltage

R is the resistance

Now;

   V = IR;

     So;

  Power  = I x (IR) = I²R

Also,

   Power  = \(\frac{V^{2} }{R}\)  

The right choice is D

Answer:

Explanation:

It 100 kg It think

The electric force dominate at the atomic scale while the gravitational force dominates on the large scale that includes the solar system and beyond because atomic particles have too little mass for gravitational attraction to complete with electric forces, and at large distances, individual charges have essentially no effect since overall, atoms are electrically neutral.

Electric force is described as the repulsive or attractive interaction between any two charged bodies.

Electric forces are dominant in the binding together of atoms which is made up of positively charged nuclei and negatively charged electrons. Gravity on the other hand holds the sun, the solar system, and the galaxy together.

Gravitational force is known to be the weakest, and yet the most pervasive, of the four basic forces  and it acts on all forms of mass and energy and thus acts on all subatomic particles, including the gauge bosons that carry the forces.

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Answer:

The simplest way to put it is that friction is a force in which there is a resistance between material elements when they slide against each other. There is no completely accurate answer as to why friction occurs, but scientists believe that it is because of tiny bumps on the surface of a material.

The video screens in new cars that display maps and provide directions are made possible through GPS technology and advanced navigation systems. GPS global positioning system is a satellite-based navigation system that allows devices to determine their precise location and time information.

In a car, GPS technology is used in conjunction with navigation software to provide real-time mapping and directions. The navigation software uses a combination of GPS global positioning system data and information about roads, traffic, and points of interest to provide drivers with the most efficient route to their destination.

The video screen in the car displays the map and directions in a user-friendly format, allowing the driver to easily follow the route. The navigation system may also include voice instructions to guide the driver, reducing the need for the driver to take their eyes off the road. The use of GPS and advanced navigation systems has revolutionized the way we travel, making it easier and more convenient to navigate to new locations.

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Hello,

✔ We have : λ = T x v ⇔ v = λ x f

The speed of this sound wave is therefore 340 m/s.

a. The minimum inductance of the tank circuit is 56.85 H

b. The maximum inductance of the tank circuit is 199.86 H

The resonant frequency of a series RLC circuit is given by

f = 1/2π√LC where

Making L subject of the formula, we have

L = (2πf)²/C

The minimum inductance of the tank circuit is 56.85 H

To find the minimum inductance, we substitute the value of

L = (2πf)²/C

L = (2π × 4.8 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (9.6π × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (30.159 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = 909.583 × 10⁻¹² Hz²/1.6 × 10⁻¹¹ F

L = 568.489 × 10⁻¹ H

L = 56.8489 H

L ≅ 56.85 H

The minimum inductance of the tank circuit is 56.85 H

The maximum inductance of the tank circuit is 199.86 H

To find the maximum inductance, we substitute the value of

L = (2πf)²/C

L = (2π × 9.0 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (18π × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = (56.549 × 10⁻⁶ Hz)²/1.6 × 10⁻¹¹ F

L = 3197.75 × 10⁻¹² Hz²/1.6 × 10⁻¹¹ F

L = 1998.59 × 10⁻¹ H

L = 199.859 H

L ≅ 199.86 H

The maximum inductance of the tank circuit is 199.86 H

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Answer:

What is the quantity that has the units of m/s²?

Acceleration is the quantity that has the units of m/s².

Explanation:

Acceleration is the rate of change of velocity.

Acceleration=(Final velocity-Initial velocity)/Time.

Answer:

air above a wild fire

Explanation:

the type of current formed in the pot is referred to as a convectional current which forms when the heated fluid rises making the cool fluid descend the same happens with the air above a wildfire a convectional current will form when the warm air rises and the cool air descends.the main reason for tge descending and ascending is that the air or liquid closest to the source of heat will get heated making it lighter but the air or liquid tgat was further from the source of heat will not be as light so as the warm fluid rises, the cool fluid descends.

Answer:

air above a wildfire

Explanation

A particle begins its motion at the origin with an initial velocity of i - j + 3k. This means that it moves in the positive x-direction, negative y-direction, and positive z-direction.

The initial velocity vector of the particle is given as i - j + 3k, which implies that the particle has an initial velocity component of 1 unit in the positive x-direction, -1 unit in the negative y-direction, and 3 units in the positive z-direction. This information helps us determine the direction and magnitude of the particle's motion.

The particle will move in a straight line, maintaining a constant speed, as long as no external forces act upon it. The trajectory of the particle can be traced by integrating its velocity vector with respect to time. The motion of the particle can be further analyzed using concepts from kinematics and dynamics to determine its position, acceleration, and any changes in its trajectory.

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The arrow representing the acceleration acting on the astronaut pushing the wrench away from himself would point in the opposite direction of the force applied.

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. When the astronaut pushes the wrench away from himself, he applies a force in one direction. In response, the wrench exerts an equal and opposite force on the astronaut, as described by Newton's third law of motion.

The arrow representing the acceleration acting on the astronaut would point in the direction opposite to the force applied. This is because the acceleration is determined by the net force acting on the astronaut, which is in the opposite direction of the force he applied to the wrench. Therefore, the arrow indicating the acceleration would point in the direction opposite to the motion of the wrench, indicating that the astronaut is accelerating in the opposite direction.

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The spring with spring constant k = 11 N/m is stretched at a distance of 0.25 m and the force of the spring is 2.75 N.

Hooke's law states that the applied force is directly proportional to the displacement or change in length of the spring. F ∝ x, where x is the displacement. It is also defined as, F = -Kx, where k is the proportionality constant or force constant. F acts as a restoring force that returns the object to its original state, minus sign is used to indicate the force is restoring force.

From the given,

spring constant (k) = 11 N/m

displacement of spring = 0.25 m

The restoring force, F = - kx

F = - (11×0.25)

 = - 2.75 N

Thus, the restoring force is 2.75 N.

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Answer:

this is question is trying to trick you

Explanation:

it gives long words but all you need to know is just a few

the second law of reflection states that the angle of incidence equals to the angle of reflection

so if the angle of incidence = 30

then

the angle of reflection = 30

hope this helps,

please mark it brainliest

Answer: The pressure that the brick exerts on the surface is approximately 781.8 Pa

Explanation:

Pressure is defined as the force exerted per unit area. In this case, the force exerted by the brick is its weight, which is the mass multiplied by acceleration due to gravity.

The formula to calculate pressure is:

P = F/A

where:

- P is the pressure

- F is the force

- A is the area

First, we need to calculate the weight of the brick. The weight (F) can be calculated using the equation F = m*g, where m is the mass of the brick and g is the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s².

F = m*g

F = 1.8 kg * 9.8 m/s²

F = 17.64 N (rounded to two decimal places)

Next, we need to calculate the area of the cross section of the brick. The area (A) is calculated by multiplying the length by the width.

A = length * width

A = 21.5 cm * 10.5 cm

Before we can do this calculation, we need to convert the measurements from centimeters to meters, because the standard unit of measurement for area in physics is square meters (m²). 1 cm = 0.01 m, so:

A = 0.215 m * 0.105 m

A = 0.022575 m²

Finally, we can calculate the pressure using the formula P = F/A:

P = 17.64 N / 0.022575 m²

P = 781.8 Pa (rounded to one decimal place)

So, the pressure that the brick exerts on the surface is approximately 781.8 Pa (Pascals).

The bowling ball experiences the greater magnitude impulse during the collision since it is initially at rest and is given the momentum of the small ball which has a speed of 5m/s.

The impulse of the bowling ball can be calculated using the equation impulse = change in momentum = mvf - mvi, where m is the mass of the bowling ball, vf is its final velocity, and vi is its initial velocity.

Since the bowling ball is initially at rest (vi = 0), the impulse can be calculated as mvf = m(5m/s) = 5m^2/s. The impulse of the small ball can be calculated in the same way, giving an impulse of 5m^2/s. Therefore, the bowling ball experiences a greater magnitude impulse during the collision.

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Answer:0-------0

do we have options?

Explanation:

(ahhhggg ignore i dont remember how to delete answers)

No. In my opinion, they were not used creatively. They were used speciously, disingenuously, and unimaginatively.

As always, others are free to disagree.

Answer:

62760J

Explanation:

Given parameters:

Mass  = 0.5kg  = 500g

Initial temperature  = 30°C

Final temperature  = 65°C

Unknown:

How much energy is absorbed by the water  = ?

Solution:

To solve this problem, we use the expression below:

  H  = m C Δt

  H =  m  x C x (t₂ - t₁ )

m is the mass

C is the specific heat  = 4.184J/g°C

t₂ is the final temperature

t₁ is the initial temperature

So;

              H  = 500 x 4.184 x (65  - 30) = 62760J

One of the four mentioned is not a plate boundary is b. insurgent.

Plate tectonics is the theory that explains the movement of Earth's lithosphere, which is composed of large plates that glide over the mantle. The plates are separated by three types of plate boundaries: divergent, convergent, and transform. Transform boundary is where two plates slide past one another in opposite directions, either horizontally or diagonally. The San Andreas Fault is a well-known example of a transform boundary. Divergent boundaries are where two plates pull away from each other and new crust is created.

The Mid-Atlantic Ridge is an example of a divergent boundary and convergent boundary is where two plates move towards each other and one plate gets consumed or goes under the other. The Himalayas were created as a result of the collision of two convergent plates, the term insurgent is not used in plate tectonics. The correct term that describes the three main types of plate boundaries is not insurgent but instead transform, divergent, and convergent boundaries. So the correct answer is b. insurgent.

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Answer:

51 miles/hour

Explanation:

Talia is on a road trip with some friends. in the first 2 hours, they travel 100 miles. then they hit traffic and go only 30 miles in the next hour. the last hour of their trip, they drive 75 miles. calculate the average speed of talia’s car during the trip. give your answer to the nearest whole number.

The average speed would be 51 miles/hour.

The average speed of a moving object is defined as the total distance traveled relative to the total time taken fro the journey. Mathematically, it is given as:

  total distance traveled/total time taken.

In this case;

Total distance traveled = 100 + 30 + 75 = 205 miles

Total time taken = 2 + 1 + 1 = 4 hours

Therefore;

Average speed = 205/4 = 51.25 miles/hour

To the nearest whole number = 51 miles/hour

The most common leadership styles related to Theory X and Theory Y are authoritarian, democratic, and laissez-faire.

The correct option to the given question is option b.

Theory X and Theory Y are two opposing attitudes towards individuals that were developed by Douglas McGregor. They were developed by Douglas McGregor as part of his work on the nature of leadership and managerial behavior. They were developed as a way of describing two different management styles that could be employed to motivate employees.

Theory X and Theory Y have been widely used to explain how different managers lead their employees and how these leadership styles affect employee behavior and motivation. McGregor suggested that managers with a Theory X perspective tend to view their employees as lazy, untrustworthy, and in need of strict supervision. As a result, managers with a Theory X perspective tend to adopt an authoritarian leadership style, which involves issuing orders and imposing rules on employees.

On the other hand, managers with a Theory Y perspective tend to view their employees as motivated and self-directed. As a result, managers with a Theory Y perspective tend to adopt a more democratic leadership style, which involves empowering employees and involving them in the decision-making process. Lastly, the laissez-faire leadership style is more hands-off, with the manager delegating most of the decision-making power to their employees.

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