Which pairs of elements could not react to form an Ionic compound

If a force F is exerted over an area A, the pressure P over that area is given by:

The pressure over the area of contact of the tires is the same as the pressure inside the tires. In this case, the force is the weight of the car and the pressure is given. Then, the area of contact is unknown.

Let A be the area of contact of each tire. Then, the total area of contact is 4A and the equation becomes:

Isolate A from the equation:

Replace F for the expression mg, which is the weight of the car:

Where g is the gravitational acceleration, 9.81m/s^2.

To find the answer, replace the value of each known variable using SI units.

Since 1psi = 6894.76Pa, then:

Therefore, the area of contact each tire makes with the road is approximately 0.0137m^2.

The front of the truck is designed to crumple during a collision to absorb the impact energy, slow down the collision, and protect the well-being of the passengers. This design feature helps increase the collision time, reduce the forces acting on the passengers, and minimize the risk of severe injuries.

Danica observes a collision between two vehicles. She sees a large truck driving down the road. It strikes a small car parked at the side of the road. On colliding, the truck applies a force on the stationary car, and the stationary car applies an opposite force on the truck. The front of the truck is designed to crumple in order to absorb the impact energy and slow down the collision , which protects the well-being of the passengers.

During a collision, the principle of Newton's third law of motion comes into play. According to this law, for every action, there is an equal and opposite reaction. In the case of the collision between the truck and the car, the truck exerts a force on the car, pushing it forward, while simultaneously experiencing an equal and opposite force from the car.

The purpose of designing the front of the truck to crumple is to increase the collision time and absorb the kinetic energy. When the truck collides with the stationary car, the front of the truck deforms, crumples, and absorbs a significant amount of the impact energy. This process increases the time over which the collision occurs, reducing the forces acting on the passengers and minimizing the risk of severe injuries.

By allowing the truck to crumple, the kinetic energy of the collision is transformed into other forms, such as deformation energy and heat. This energy transformation helps protect the passengers by reducing the deceleration forces acting on them. It also helps prevent the transfer of excessive forces to the car's occupants and reduces the likelihood of severe injuries.

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(1) The atomic mass of the new atom is 220.

(2) The atomic number of the new atom is 86

(3) The symbol of the new atom is Rn

(4) The type of decay demonstrated is alpha decay.

Nuclear Reactions are processes in which one or more nuclides are produced from a collision between two nuclei or one nucleus and a subatomic particle.

Alpha decay occurs in the nuclei of heavy elements, like radium, uranium, thorium.

When a nucleus of Ra (radium) decays, it emits an alpha particle and becomes an Rn (radon) nucleus.

The nuclear reaction equation is given as;

\(^{224}_{88}Ra ----- > ^4_2He \ +\ ^A_ZX\)

where;

The atomic number of the new atom is calculated as;

Z = 88 - 2 = 86

The atomic mass of the new atom is calculated as;

A = 224 - 4 = 220

An atom corresponding to atomic number of 86 = radon

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A VfL (Vertical Field LED) backlighting system is commonly used in LCD (Liquid Crystal Display) televisions.

LCD TVs rely on a backlight to illuminate the liquid crystal layer, which controls the passage of light to create the visual image. The VfL technology is a specific type of LED backlighting arrangement used in certain LCD TV models. In a VfL backlighting system, the LEDs (Light-Emitting Diodes) are positioned vertically along the edges of the LCD panel.

The light emitted by these LEDs is directed across the panel using light guides or optical films, illuminating the liquid crystal layer uniformly. One advantage of VfL backlighting is its ability to provide consistent illumination across the LCD panel, reducing any potential inconsistencies in brightness or color uniformity. The vertical orientation of the LEDs allows for more precise control over light distribution, improving overall image quality.

Additionally, VfL backlighting offers potential advantages in terms of power efficiency. By selectively dimming or turning off specific zones of LEDs, local dimming techniques can be employed to enhance contrast and black levels, resulting in improved picture quality while conserving energy. It's important to note that VfL backlighting is just one of several backlighting technologies available for LCD TVs.

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Answer:

Explanation:

mass of probe m = 474 Kg

initial speed u = 275 m /s

force acting on it F = 5.6 x 10⁻² N

displacement s = 2.42 x 10⁹ m

A )

initial kinetic energy = 1/2 m u²  , m is mass of probe.

= .5 x 474 x 275²

= 17923125 J  

B )

work done by engine

= force x displacement

= 5.6 x 10⁻² x 2.42 x 10⁹

= 13.55 x 10⁷ J  

C ) Final kinetic energy

= Initial K E + work done by force on it

= 17923125 +13.55 x 10⁷

= 1.79 x 10⁷ + 13.55 x 10⁷

= 15.34 x 10⁷ J

D ) If v be its velocity

1/2 m v² = 15.34 x 10⁷

1/2 x 474 x v² =  15.34 x 10⁷

v² = 64.72 x 10⁴

v = 8.04 x 10² m /s

= 804 m /s

Answer:

3kg

Explanation:

3kg is the appropriate mass

Answer:

3kg

Explanation:

just took the test

The angle of the seal's path below the horizontal at 22.6 degree, cover 991 m distance at the speed 17.53 m/s.

A. We can use the tangent function to find the angle of the seal's path below the horizontal:

tan(angle) = opposite side / adjacent side = 360 m / 920 m = 0.3913

angle = tan^-1(0.3913) = 22.6 degrees below the horizontal

B. To find the total distance covered by the seal, we can use the Pythagorean theorem:

distance = sqrt(360^2 + 920^2) = sqrt(130320 + 846400) = sqrt(976620) = 991 m

C. To find the seal's speed, we divide the total distance covered by the time taken:

speed = distance / time = 991 m / 4.0 min * (1 min / 60 s) = 17.53 m/s.

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Answer:

  a) 14.1°

  b) over

Explanation:

The usual model of ballistic motion assumes that the only force on the flying object is that due to gravity. When an object is launched with initial velocity v0 at some angle θ with respect to the horizontal, the distance it travels is ...

  d = (v0)²sin(2θ)/g

Using this relation, we can find the launch angle to make the object travel a given distance:

  θ = 1/2arcsin(dg/v0²) . . . . where g is the acceleration due to gravity

__

For the arrow to hit a target 85 m away at the same height it was launched with speed 42.0 m/s, the launch angle must be ...

  θ = 1/2arcsin(dg/v0²) = 1/2(arcsin(85·9.8/42²)) ≈ 14.0893°

The arrow must be released at an angle of about 14.1°.

__

The flight time to the tree at a distance of 42.5 m will be that distance divided by the horizontal speed:

  t = 42.5/(42cos(14.0893°)) ≈ 1.0433 . . . . seconds

The height at that time is ...

  h(t) = -4.9t² +42sin(14.0893°)t ≈ 5.33 . . . meters

The arrow will go over the branch.

_____

Additional comment

Since gravity provides the only force on the arrow, its horizontal speed is constant at vh = v0·cos(θ), when the arrow is launched with speed v0 at angle θ above the horizontal. Its vertical speed will be reduced by the acceleration of gravity, so will be vv = v0·sin(θ) -gt. The height is the integral of the vertical speed, so is ...

  h(t) = (1/2)gt² +v0·sin(θ)t

The height will be 0 at t=0 and at t=2v0sin(θ)/g, so the horizontal distance traveled will be ...

  d = vh·t

  = (v0·cos(θ))(2v0·sin(θ)/g) = (v0²/g)(2·sin(θ)cos(θ))

  = v0²sin(2θ)/g

Note that this is all simplified by the fact that the target and launch point are at the same level (h=0).

The drum is one of the objects that produce sound energy. When the drum is stuck by the person, it transfers the energy in the form of sound.

Hence, the correct answer is drum.

Answer:

The actual distance is  \(d_a = 0.3233\ m\)

Explanation:

From the question we are told that

     The  distance of the can is d =  43 cm  =  0.43 m

Generally the actual distance is mathematically represented as

         \(d_a = [\frac{ n_a }{n_w} ]* d\)

Where  \(n_a , n_w\) are the refractive index of air and water and their value is  

         \(n_a = 1 , \ \ \ n_w = 1.33\)

So

       \(d_a = [\frac{ 1 }{1.33} ]* 0.43\)

       \(d_a = 0.3233\ m\)

Answer:

105 kg*m/s

Explanation:

p=mv

momentum=mass*velocity

momentum=15kg*7m/s

momentum=105kg*m/s

Answer:

Endothermic, because energy is absorbed (A)

Explanation:

The reaction that take place in the instant cold pack causes the surroundings around it, including the bag that contains it. When the bag loses heat to the cold pack, the cold pack absorbs the heat, thereby causing the environment (the bag) to be cold.

Answer:

The correct answer is C. Homeostasis

Explanation:

Homeostasis describes the relatively constant internal physical conditions of an organism.

The approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

To approximate the heat transfer through the air layer in the double-paned window, we can assume that the glass layers have a negligible impact on the heat flow. The heat transfer can be calculated using Fourier's Law of Heat Conduction, which states that the heat flow (Q) is proportional to the temperature difference (ΔT) and inversely proportional to the thickness (L) and thermal conductivity (k) of the material.

First, we need to calculate the effective thermal conductivity of the air layer due to its thickness and the thermal conductivity ratio between air and glass. Let's denote the thermal conductivity of air as k_air and the thermal conductivity of glass as k_glass. Since glass has a thermal conductivity roughly 36 times greater than air, we have k_glass = 36 * k_air.

Next, we calculate the effective thermal conductivity of the air layer as:

k_eff = (k_air * L_air) / (L_air + k_glass)

Substituting the given values, we have:

k_eff = (k_air * 0.0165 m) / (0.0165 m + 0.005 m) = 0.01309 * k_air

Now, we can calculate the heat flow per second through the air layer using the formula:

Q = (k_eff * A * ΔT) / L_air

Substituting the given values, we get:

Q = (0.01309 * k_air * 0.760 m^2 * 23.0 K) / 0.0165 m = 24.4 J/s

Therefore, the approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

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current is reversed now

the force is also reversed

that means, the conductor(wire) will move in reverse of the previous direction

means option c

When the teacher asked the student to make words out of the jumbled word gzeysktqix, the student was being tested on his ability to unscramble words. Unscrambling words is the process of taking a word or series of letters that are out of order and rearranging them to form a word that makes sense.

When trying to unscramble a word, it is important to look for any patterns that can help identify smaller words within the jumbled letters. This can help make the process easier and quicker. For example, in the jumbled word gzeysktqix, one might notice that the letters "sktqix" appear together.

This could indicate that these letters could potentially form a word. By looking at the remaining letters, one could notice that the letters "g", "z", "e", and "y" could also form smaller words. After some rearranging, the letters can be unscrambled to form the words "sky", "zig", "sex", and "yet". These are just a few examples, as there are likely many other words that can be formed from this jumbled word.

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Answer:

a sphere of influence mmmmmmmmmmm not actually right

Answer:

The correct solution will be "271.95 N".

Explanation:

The given values are:

velocity  

v = 3.5 m/s

mass

m = 9.0 kg

r = 0.6 m

According to the question:

⇒ \(F_{branch}=F_{gravity}+F_{centrifugal}\)

⇒             \(=mg+\frac{mv^2}{r}\)

On substituting the values, we get

⇒             \(=9\times 9.8+\frac{9\times (3.5)^2}{0.6}\)

⇒             \(=88.2+\frac{110.35}{0.6}\)

⇒             \(=271.95 \ N\)

The spontaneous drying of leaves occurs due to the loss of moisture through evaporation, primarily facilitated by transpiration and environmental factors such as temperature, humidity, and airflow. Aging and senescence also contribute to the process.

The spontaneous process of drying leaves, also known as desiccation, is a natural occurrence that takes place as a result of various factors. Primarily, it involves the loss of moisture from the leaf tissues through evaporation. Leaves have specialized structures called stomata, small openings on their surfaces, which facilitate the exchange of gases, including water vapor.

When environmental conditions such as high temperature, low humidity, and increased airflow prevail, water molecules escape through the stomata into the surrounding air. This process, called transpiration, plays a significant role in leaf drying. Additionally, sunlight accelerates the rate of evaporation by providing energy to convert water into vapor.

As moisture content decreases, the cell walls of the leaf tissues contract, causing the leaf to become dehydrated and eventually dry. The process is also influenced by the plant's natural aging and senescence, where the leaf undergoes programmed cell death.

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Designed and developed by private companies: Commercial satellite.

Used to access electronic intelligence: Reconnaissance satellite.

Used to make strategic decisions in advance: Early warning satellite.

Used to assist in strike planning: Reconnaissance satellite.

Remote sensing: Commercial satellite.

Commercial Satellite are designed and developed by private companies and are primarily used for commercial purposes. They can provide a wide range of services, including telecommunications, broadcasting, internet connectivity, and navigation. Commercial satellites are often operated by companies like SpaceX, OneWeb, or Iridium.

Reconnaissance satellites are used to gather information about a specific area or target. They are equipped with advanced imaging systems, such as high-resolution cameras or synthetic aperture radar (SAR), which allow them to capture detailed images or collect other types of data for military or intelligence purposes.

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Answer:

6?

Explanation:

Answer:

did you get the answer bc I think its -3

Explanation:

The work that the electric force do on q₀ during its motion from A to B is + 0.792 J.

When an item is pushed across a specific distance by an external force, work is the quantity of energy that is transmitted to the object.

In the given problem, distance between q₀ and q is:

d₁ = √2 x 7.00 cm = 9.90 cm

The distance between q₀ and the charge q is:

d₂ = √2 x 7.00 cm = 9.90 cm

The electric force between two charges is given by Coulomb's law:

F = k × q₁× q₂ / r²

where k is the Coulomb constant, q₁ and q₂ are the charges, and r is the distance between them.

At point A, the electric force on q₀ due to the charge q is:

F1 = k × q₀ × q / d₁²

= (9.0 x 10⁹ N·m²/C²) × (-1.00 × 10⁻⁶C) × (7.00 × 10⁻⁶ C) / (9.90 x 10⁻² m)²

= -4.002 N

The negative sign indicates that the force is in the opposite direction to the displacement of q₀.

At point B, the electric force on q₀ due to the charge q is:

F2 = k × q₀ × q / d₂²

= (9.0 × 10⁹)× (-1.00 × 10⁻⁶) × (7.00 × 10⁻⁶) / (9.90 × 10⁻²)²

= -4.002 N

So, work done by a constant force:

W = F × d × cosθ

So the work done by the electric force on q₀ from A to B is:

W = F1 × d1 × cos(180) + F2 × d2 × cos(180) = (-4.002 N) × (9.90 × 10⁻² m) × (-1) + (-4.002 N) × (9.90 × 10⁻² m) × (-1) = 0.792 J

The positive value indicates that the work done by the electric force is in the direction opposite to the displacement of  q₀, which means that the electric force does negative work on q₀.

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Working of a calorimeter:

The calorimeter is used to measure the specific heat of substance. The substance is placed inside calorimeter and the starts heating the calorimeter, the heat relased by the calorimeter will be absorbed by the substance present in the calorimeter.

There are following parts in the calorimeter,

Stirrer

Thermometer

Insulation

Crucible

Steel bomb

Ignition wires

Ignition coil

Oxygen supply

When the substance is placed in the calorimeter, then with the help of ignition wires the ignition coil is heated placed in the steel bomb. The heat released by the substance is abosorbed by the calorimeter.

By applying heat balance equation, the specific heat of substance can be calculated. The heat balance equation is given by,

Here, m is the mass of substance, ∆T is the change temperature of the substance, Ccalorimeter is the specific heat of material of calorimeter, ∆T' is the change in temperature of the calorimeter, M is the mass of material of calorimeter.

An autobiography, like a memoir, is the writer's recounting of his or her life and is written in the first person, making the writer the protagonist of the narrative.

Contemporary/Realistic: In order to accurately portray our environment and society, realistic fiction develops fictional people and circumstances. Growing up and dealing with social and personal issues are the main themes. Characters in this genre are depicted as they learn about both themselves and others.

Historical and contemporary fiction make up realistic fiction's two subgenres. Unlike current fiction, which takes place in the present or recently past, historical fiction takes place at a period that is far enough back in history to be deemed history.

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Answer: the answer is b

Explanation:

edge

Answer:

Explanation:

it is C

Answer:

653 kN

Explanation:

First get everything into metric units :

  169 miles/hr = 75.55 m/s

F = ma  

find the acceleration    from 0 to 75.55 m/s

  average is 75.55 / 2 = 37.775 m/s  

     so 90 meters takes   90 / 37.775 = 2.38 seconds

  vf = vo + at      

 75.55 = 0 + a * 2.38    shows a = 31.71 m/s^2

Now   F = ma

          F = 22300 (31.71) = 707133.3 Newtons

               subtract the engine force....the remainder is the catapult force

                      707033.3  - (27000 *2) = 653133.3 N  = 653 kN

answer:

resultant = 127.65 in the positive direction

explanation:

F1 = 50N , F2 = 40N, f3 = 55N , f4 = 60N

Fy = 50 sin 50 = 50 × -0.26 = -13

Fx = 40 cos 0 = 40×1 = 40

fx = 55 cos 25 = 55×0.99 = 54.45

Fy = 60 sin 70 = 60 × 0.77 = 46.2

resultant = -13+40+54.45+46.2 = 127.65 in the positive direction

Answer: B

Explanation: the teacher just told us the answer

The gravitational force between the two spheres is \(1.67 \times 10^{-11} \ N\).

The given parameters;

The gravitational force between the two spheres is determined by applying Newton's law of universal gravitation as shown below;

\(F = \frac{Gm_1 m_2 }{r^2} \\\\\)

where;

\(F = \frac{(6.67\times 10^{-11})\times (1\times 1)}{2^2} \\\\F = 1.67 \times 10^{-11} \ N\)

Thus, the gravitational force between the two spheres is \(1.67 \times 10^{-11} \ N\).

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Answer:

f = 8 N

Explanation:

Data provided in the question

Radius of the pulley  = r = 0.05 m

Moment of inertia = (I) = 0.2 kg.m^{2}

Angular acceleration = ∝ = 2 rad/sec

Based on the above information

As we know that

Torque is

\(= force \times radius\)

\(= f \times r\)

And,

Torque is also

\(= moment\ of\ inertia \times angular\ acceleration\)

\(= I \times \alpha\)

So,

We can say that

\(f \times r = I \times \alpha\)

\(f \times 0.05 = 0.2 \times 2\)

0.05f = 0.4

f = 8 N

We simply applied the above formulas

The charges are of the same type. As a result, any force exerted between them will be repulsive.

What exactly is force?

Force is an influence that causes an object to accelerate, decelerate, or change its direction of motion. It is a vector quantity, meaning it has both magnitude (strength) and direction. Examples of forces include gravity, friction, electromagnetic fields, and the applied force of pushing or pulling on an object.

The charges of the same nature repel each other because of the electrostatic force of repulsion. This is because like charges have the same sign and the electrostatic force of repulsion between them is stronger than the attraction between opposite charges. This repulsive force increases as the distance between the charges decreases. This is why two objects with the same charge will be pushed away from each other.

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