Atoms from group 16 will generally form ions with a charge of

A combining form for lungs is  "pneum/o".

In medical terminology, a combining form is a word part that is added to the beginning or end of a root word to modify its meaning. The combining form "pneum/o" is used to refer to the lungs, air, or respiration.

Some common medical terms that use the combining form "pneum/o" include:

Pneumonia: An infection of the lungs that can cause inflammation, coughing, and difficulty breathing.

Pneumothorax: A condition in which air leaks into the space between the lung and chest wall, causing the lung to collapse.

Pneumonectomy: A surgical procedure in which one or more lobes of the lung are removed.

Pneumology: The study of the lungs and respiratory system.

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Currents can be created by magnetic fields. A current is capable of creating a magnetic field.

Magnetic fields are constantly shifting, pushing and pulling electrons. Metals like copper and aluminium have slackly held electrons. As a magnet is moved around a wire or a coil of wire, the electrons in the wire are pushed, creating an electrical current.

Sound energy can be made up of both kinetic and potential energy. A musical instrument is one possible illustration. When the instrument is performed, sound waves are produced that have kinetic energy. Nevertheless, potential energy is all that is present when that same musical instrument is at rest.

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Answer:

Option two

Explanation:

im smort

Answer:

I think it's B. there is a cold air mass pushing warm air mass up and replacing it over San Francisco

Answer:

there it is fella u were right with ur answer

Answer:

Uhm where are the questions and answers?

the equation and dividing through by dz, we obtain: dP/dz = -(density of air) * g,  the pressure obeys the differential equation: dP/dz = -(mg / (RT)) * P.

a. Consider a horizontal slab of air with a thickness of dz. Since the slab is at rest, the pressure holding it up from below must balance both the pressure from above and the weight of the slab.

The pressure from above can be approximated as P(z + dz), where P(z) is the pressure at height z and P(z + dz) is the pressure at a slightly higher altitude.

The weight of the slab is given by the product of its mass and the acceleration due to gravity, which is equal to the density of air times the volume of the slab times g. The volume of the slab can be approximated as the product of its thickness dz and the cross-sectional area A.

Therefore, the weight of the slab is given by: dW = (density of air) * (A * dz) * g

Since the pressure holding up the slab from below must balance the pressure from above and the weight of the slab, we have the following equilibrium condition:

P(z) + dP = P(z + dz) + dW

Substituting the expression for the weight of the slab, we get:

P(z) + dP = P(z + dz) + (density of air) * (A * dz) * g

Rearranging the equation and dividing through by dz, we obtain:

dP/dz = -(density of air) * g

b. The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

The number of moles of air (n) can be expressed in terms of the average mass of air molecules (m) and the mass of the slab (m_s) as: n = m_s / m

Since air is a mixture of N2, O2, and argon, we can assume that the average mass m is the average of the masses of these molecules weighted by their respective percentages in the mixture.

The mass of the slab (m_s) can be approximated as the product of the density of air (ρ), the cross-sectional area (A), and the thickness (dz). Therefore, we have: m_s = ρ * A * dz

Substituting the expression for m_s into the equation for n, we get: n = (ρ * A * dz) / m

Rearranging the ideal gas law to solve for density (ρ), we have: ρ = (P * m) / (RT)

Substituting this expression for density into the equation for n, we get: n = (P * A * dz) / (RT)

Substituting the expression for n into the equation for m_s, we get: m_s = (P * A * dz) / (RT)

Substituting the expression for m_s into the equation for dP/dz derived in part a, we have:

dP/dz = -[(P * A * dz) / (RT)] * g

Simplifying the equation, we obtain:

dP/dz = -(PgA / (RT)) * dz

Dividing through by P and multiplying through by -1, we get:

dP/dz = -(mg / (RT)) * P

Therefore, the pressure obeys the differential equation:

dP/dz = -(mg / (RT)) * P

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Answer: The change in momentum is +20 kg.m/s

Explanation:

To calculate the final velocity of object, we use the first equation of motion:

\(v=u+at\)

where,

v = final velocity

u = initial velocity = 0 m/s

a = acceleration = \(10m/s^2\)

t = time = 0.5 s

Putting values in above equation, we get:

\(v=0+(10\times 0.5)\\\\v=5m/s\)

Momentum is defined as the product of the mass and velocity of an object. It is given by the equation:

\(p=mv\)

where,

p = momentum

m = mass of object = 2 kg

Let the upward velocity be positive and the downward velocity be negative

When the object is dropped, the velocity is downward

v = -5m/s

Initial momentum = \(2kg\times (-5m/s)=-10kg.m/s\)

When the object is bounced back, the velocity is upward

v = +5m/s

Final momentum = \(2kg\times (+5m/s)=10kg.m/s\)

Change in momentum = Final - Inital

Change in momentum = [10 - (-10)] = +20 kg.m/s

Hence, the change in momentum is +20 kg.m/s

Answer: d) income only includes salary

Explanation:

i just took a test for economics and personal finance and got it correct

The statement that "Income only includes salary " is not true.

Income is the money that an individual or organization receives in return for their services or goods. 

Depending on the context—such as taxation, financial accounting, or economic analysis—income may have a variety of definitions.

For the majority of people, their total earnings include their wages and salaries, investment returns, pension payments, and other receipts. 

For businesses, income refers to the money made from selling goods and services as well as any interest or dividends paid on the company's cash holdings and reserves.

So, the amount of money, property, and other value transfers received over a predetermined period in return for goods or services is often referred to as "income."

That's why income does not include only salary.

Hence Statement (D) about the income is not true.

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25w = 100J/4s is the equation which rightly deciphers the relation of power, work and time.

Power is the rate at which work is performed or energy is delivered in accordance with  science and engineering. It can be represented as W/t, which refers to the product of the quantity of work finished (W) or energy converted (E) divided by the amount of time (t).

power (w) equals work (J)/time (s)

The energy that is generated when a force is imposed on a moving object is described as work. The work that a force would do on an item is directly proportional to the force multiplied by the displacement multiplied by the cosine of the angle between them. The SI unit of work and energy is denoted by the letter J.

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Show that 25 W of power is required to give a brick 100 J of PE in a time of 4 s .

Answer:

Kinetic Energy

Explanation:

Kinetic energy is energy due to motion.

Answer:

D

Explanation:

Elastic energy is energy stored in a object when there is a strain or compression on the object.

Nuclear energy is the energy found in the nucleus of an atom.

Potential energy is energy that an object stores because of its position to other objects.

Kinetic energy is the energy that an object has due to motion.

The child is riding her bicycle, therefore the child is in motion. So, the correct answer must be D. Kinetic energy

The average speed of the bus is 60 km/hr.

To find the average speed of the bus, we can use the formula:

Average speed = total distance traveled / total time taken

The total distance traveled by the bus is 80 km + 40 km = 120 km, which is given in the problem statement.

The total time taken by the bus is also given as 2 hours.

Therefore, the average speed of the bus can be calculated as:

Average speed = total distance traveled / total time taken

= 120 km / 2 hours

= 60 km/hr

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The highest trophic level has the least available energy in kilojoules.

Even though the food web is not shown in the question, but we know that energy decreases steadily as it is passed on from one trophic level to the next according to the second law of thermodynamics.

Energy enters into the system from the sun. The primary producers utilize this energy to produce food. As plants are eaten by animals, this energy is transferred along the food web an diminishes at each higher trophic level.

At the highest trophic level, the the least available energy in kilojoules in this food web is found.

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The electron drift velocity across a semiconductor wafer with a thickness of 0.7 mm and a potential of 100 mV applied is 28.6 m/s. It takes approximately 0.245 µs for an electron to move across this thickness.

Part A: To calculate the electron drift velocity, we use the formula:

Drift velocity = (Potential / Thickness) × Mobility

Given that the potential is 100 mV (or 0.1 V), the thickness is 0.7 mm (or 0.0007 m), and the mobility is 0.2 m²/(V-s), we can substitute these values into the formula:

Drift velocity = (0.1 V / 0.0007 m) × 0.2 m²/(V-s) = 0.2857 m/s ≈ 28.6 m/s (rounded to three significant digits)

Part B: To calculate the time required for an electron to move across the thickness, we divide the thickness by the drift velocity:

Time = Thickness / Drift velocity

Substituting the values, we have:

Time = 0.0007 m / 28.6 m/s = 0.0000245 s ≈ 0.245 µs (rounded to three significant digits)

Therefore, it takes approximately 0.245 µs for an electron to move across the thickness of the semiconductor wafer.

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The reason why a delivery truck filled with birds sitting on the floor be heavier than a truck with the same birds flying around is because when the birds are sitting on the floor, they are adding their weight to the truck.

Meanwhile, if the birds are flying around they aren't resting on the truck or touching it, so therefore their weight wouldn't be added to the truck.

The mass of the truck will remain the same as you cannot change the mass but the weight will vary depending on the items and objects placed in it.

Answer: C

Explanation:

if the mass stays constant, measuring mass would be useless (A is wrong). while the distance is good knowledge, it isnt nessecary in solving for acceleration (which we need to find the force using F=ma). only time is nessecary, since it is used in all kinematics equations. use the one without distance (v=v0+at) (eliminating B) to get a.

Direction is useless, probably common sense

Explanation:

Density=mass/volume

mass=x

10.49=X/12.99

X=10.49 X12.99

X=136.29657

mass=136.3g/cm^3

I hope it helped.

9514 1404 393

Answer:

  27.85 m/s

Explanation:

If we take the direction of motion of the aircraft carrier as positive, The speed of the deck is 31.0 m/s. Bond is running in the opposite direction, so his speed relative to the deck is -3.15 m/s.

Bond's speed relative to the stationary reference (the sub or the water), is ...

  31.0 m/s - 3.15 m/s = 27.85 m/s

The magnitude of the change in potential energy experienced by the electron is a. 1500 eV.

Potential difference = 1500V

Charge of an electron = -1.6 x 10^-19

The energy that is capable of changing into another form of energy is called potential energy. The potential energy of an object is influenced by its physical characteristics and location within a system. Potential energy can take on various shapes. For example: due to an object's mass and location within a gravitational field, it has the potential energy of gravity.

Calculating the magnitude of the change in potential energy -

ΔPE = qΔV

Substituting the values -

\(PE = (-1.6 x 10^-19 C) x (1500 V)\)

\(PE = -2.4 x 10^-16 J\)

Converting to electron volts (eV) -

= PE/Charge of electron

\(PE = -2.4 x 10^-16 J / (1.6 x 10^-19 C/eV)\)

= -1500 eV

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Answer:

What could have possibly turned the iron fence into a different texture and  color. What chemical reaction has taken place in order to change the texture and color of the iron fence? If you live in a wealthy neighborhood, then chances are, they might think it looks lazy. Weather, Rainstorms, and high humidity cause iron fences to rust. You can probably repaint the fence a different color. As long as your friends aren't harsh with you, I don't think they'll think it's ugly. I would prefer a wooden fence and then repaint it from there.

Explanation:

I hope this helps :)

Due to the unbalanced nature of this force, surface currents, or the movement of charges, will result. Therefore, the electric field must emerge perpendicular to surfaces to prevent this.

The equilibrium would be broken if there were an electric field component parallel to the conductor's surface, which would force the electric charge to travel along the surface.

There is never an electric force component that is directed parallel to the surface of an item, whether it has a symmetrical shape or not. The electric field and force acting on an object are both always perpendicular to its surface.

The requirement that the electric field be perpendicular to any conductor's surface is one of the laws governing static electric fields and conductors.

Equipotential surfaces are always parallel to the field's direction. 

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We are given; Mass of the body, m = 30 kg Initial velocity of the body, u = 0.5 m/s

Time for which force is acting, t = 2.7 s

Force acting on the body, F = 15 N.

Let's find the acceleration of the body using Newton's second law of motion.

Force, F = mass x acceleration

F = ma Acceleration, a = F/ma = 15/30a = 0.5 m/s²From the first equation of motion, we have:

Final velocity of the body, v = u + atv = 0.5 + (0.5 x 2.7)v = 0.5 + 1.35v = 1.85 m/s Therefore, the final velocity of the body is 1.85 m/s.

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We are asked to determine the magnitude of the force that acts parallel to the nail. To do that we will add the torque that acts on the point of contact. First, we draw a free-body diagram of the situation:

We have decomposed the force of the nail into its horizontal and vertical components. The horizontal component does no torque since there is no distance parallel to the force to the point of contact.

Now, we add the torques. We consider counterclockwise as positive:

Since we consider the moment before there is no angular acceleration the sum of torques adds up to zero:

Now, we determine the value of Ry as a function of "R" using the trigonometric function cosine:

Now, we multiply both sides by "R":

Now, we substitute in the sum of torques:

Now, we solve for "R". First, we add "30F" to both sides:

Now, we divide both sides by 5cm:

Now, we divide both sides by cosine:

Now, we substitute the values:

Solving the operations:

Therefore, the force on the nail is 1042.8 Newtons.

Explanation:

For an electric company, it would make more sense to charge by the watt rather than by the joule.

The joule is a unit of energy, while the watt is a unit of power. Power is the rate at which energy is consumed or produced. When we use electricity, we are consuming power, not energy.

Charging by the joule would mean that customers would be paying for the total amount of energy consumed, regardless of the rate at which it was consumed. This would not be practical, as it would be difficult for customers to estimate how much energy they would need and how quickly they would consume it. It would also be difficult for the electric company to price its services in a way that accurately reflects the value of the electricity being consumed.

Charging by the watt, on the other hand, would mean that customers would be paying for the rate at which they consume electricity. This is more practical, as it is easier for customers to estimate their power needs and for the electric company to price its services based on the rate at which electricity is being consumed.

Therefore, it makes more sense for an electric company to charge by the watt rather than by the joule.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question

mass = 70 kg

acceleration = 5 m/s²

We have

force = 70 × 5 = 350

We have the final answer as

Hope this helps you

Cathodic protection aims to shift the potential of the structure in the negative direction, typically by a specific amount, to provide effective protection against corrosion. The criteria for cathodic protection are:

a) A shift in the pipe-to-soil potential in the negative direction by 0.40 to 0.50 V from the initial potential for bare structures. This means that the pipe-to-soil potential should be lowered by 0.40 to 0.50 V compared to its initial potential when it was not protected.

b) To achieve a pipe-to-soil potential of 0.85 V with respect to an Ag-AgCl electrode. This means that the pipe-to-soil potential should be maintained at 0.85 V relative to the Ag-AgCl electrode. This potential ensures effective protection against corrosion.

c) To achieve a potential of -0.85 V with respect to a copper sulfate electrode. This means that the potential of the structure should be lowered to -0.85 V relative to the copper sulfate electrode. This potential helps to prevent corrosion by making the structure more cathodic.

d) To polarize the whole structure to the cathodic potential of the structure. This means that the entire structure should be brought to a cathodic potential to ensure uniform protection against corrosion. This involves making the entire structure more negative in terms of potential.

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Answer:

-8.4°C

Explanation:

From the principle of heat capacity.

The heat sustain by an object is given as;

H = m× c× (T2-T1)

Where H is heat transferred

m is mass of substance

T2-T1 is the temperature change from starting to final temperature T2.

c- is the specific heat capacity of ice .

Note : specific heat capacity is an intrinsic capacity of a substance which is the energy substained on a unit mass of a substance on a unit temperature change.

Hence ; 35= 1× c× ( T2-(-25))

35= c× ( T2+25)

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°{ approximated to 2 decimal place}

T2= 16.60-25= -8.40°C

C, specific heat capacity of ice is =2.108 kJ/kgK{you can google that}

To solve this we must be knowing each and every concept related to energy. Therefore, -8.40°C is the final temperature of the ice.

In physics, energy is the capacity to accomplish work. It can be potential, kinetic, temperature, electrical, chemical, radioactive, or in other forms.

There is also heat and work—energy inside the process of being transferred through one body to the other. Energy is always classified according to its type once it has been transmitted. As a result, heat transported could become thermal energy, whereas labor done may emerge as mechanical energy.

H = m× c× (T2-T1)

35= 1× c× ( T2-(-25))

35= c× ( T2+25)

specific heat capacity of ice is =2.108 kJ/kgK

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°

T2= 16.60-25= -8.40°C

Therefore, -8.40°C is the final temperature of the ice.

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Part A: Andrea cannot be sure she's at rest. According to the principle of relativity, there is no absolute rest, and the motion of an object can only be described relative to other objects. Therefore, Andrea's motion must be described relative to some other object.

Part B: If Andrea is not at rest, her velocity is likely to be within the range of 0.17 m/s to 3.4 m/s. This range is calculated using the uncertainty principle, which states that the product of the uncertainty in position and momentum of an object cannot be less than Planck's constant divided by 4π. Assuming a reasonable uncertainty in position of 1 cm, the uncertainty in momentum can be calculated as 5.29 x 10^-28 kg m/s. Dividing this by Andrea's mass of 49 kg gives a velocity uncertainty of 1.08 x 10^-29 m/s. Therefore, the range of possible velocities is approximately 0.17 m/s to 3.4 m/s.

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Answer:

it Quadruples

Explanation: