When a ball bounces against a wall there will be large change in velocity in short period of time. This means the ____ is large, hence the net ___ must be proportionately large as well.

Diatomaceous earth filters can be used for public water supplies, but they should be augmented by chlorination. Option A is the correct answer.

Diatomaceous earth filters are effective at removing small particles and can be used for public water supplies. However, they should be augmented by chlorination to ensure the complete removal of harmful microorganisms.

These filters consist of a thin layer of diatomaceous earth on top of a support structure. As water passes through the filter, particles are trapped in the diatomaceous earth layer.

Over time, the diatomaceous earth becomes clogged with particles and must be cleaned or replaced.

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The question is -

Diatomaceous earth filters:

a. Should be supplemented by a chlorination system

b. Should be integrated into a rapid sand filtration system

c. Can be used for a public water treatment system

d. Cane be used in a public sewer treatment system

In summary, when an electric current forms an electric field, a magnetic field is created, leading to the phenomenon of electromagnetism. This relationship is described by Ampere's law and has practical applications in various electrical devices and systems.

When an electric current forms an electric field, a magnetic field is created in the phenomenon of electromagnetism. This is known as Ampere's law, which states that a magnetic field is produced around a current-carrying conductor. The magnetic field is perpendicular to both the current direction and the direction of the electric field.

The strength of the magnetic field is determined by the magnitude of the current flowing through the conductor. This can be demonstrated using the right-hand rule, where if you point your right thumb in the direction of the current, your curled fingers will indicate the direction of the magnetic field lines.

This phenomenon of creating a magnetic field through an electric current has numerous practical applications. For example, it is the principle behind electromagnets used in various devices like electric motors, generators, and transformers. Electromagnetic induction, which relies on the interaction between electric and magnetic fields, is also responsible for the operation of electric generators and the transmission of electricity through power lines.

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The kinematics and Newton's second law allow us to find the height from which the block system descends is:

             y = 6.54 m

Given parameters

To find

Newton's second law gives a relationship between the net force, the mass, and the acceleration of the body.

      ∑ F = m a

Where the bold letters indicate vectors, F is the force, m the mass and the acceleration of the body.

Kinematics studies the movement of bodies, looking for relationships between position, velocity and acceleration

              y = v₀ t + ½ a t²

In the attached we have a free body diagram of the system, let's write Newton's second law.

          T - W₁ = m₁ a

         -T + W₂ = m₂ a

Let's solve the system of equations.

          W₂ - W₁ = (m₁ + m₂) a

          a = \(\frac{m_2-m_1}{m_2+m_1} \ g\)

Let's calculate

          a = \(\frac{2 -4}{ 2 +4} \ 9.8\)  

          a = -3.27 m / s²

The negative sign indicates that the heaviest body is descending.

Now we can use kinematics to find the height, as the system comes out of rest the initial velocity is zero, when he reaches the ground his height is zero.

             y = y₀ + v₀ t + ½ a t²

             0= y₀ + 0  +½ a t²          

Let's calculate

             y₀ = ½ 3.27 2²

             y = 6.54 m

In conclusion, using kinematics and Newton's second law we can find the height from which the block system descends is:

             y = 6.54 m

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The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

Electromagnetic radiation consists of waves of electromagnetic field, which propagates through space and carries momentum and electromagnetic radiant energy.

Minimum energy required to knock out an electron from the surface of the metal is called the work function.

As we know that, W= hc/λ

h -- Planck's constant ; c -- Speed of light

and λ is Longest wavelength

Given, work function of sodium metal is 2.28 eV

As 1 eV = 1.6021 * 10^-19 J

=2.28 * 1.6021 * 10^-19

= 3.65 *10^-19 J

W= hc/ λ

3.65 *10^-19 = 6.62 *10^-34 * 3 *10^8/ λ

λ = 5.44 * 10 ^-7m

λ =544 nm

The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

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Answer:

Decreases I believe

Explanation:

I'm sorry if it isn't and I have failed you

Answer:

→ Mass is the lightness or heaviness of a body that is free from any force field.

→ Mass is the volume of a body multiplied by its density.

\(.\)

Answer:

Explanation:

Adding heat can cause ice (a solid) to melt to form water (a liquid). Removing heat causes water (a liquid) to freeze to form ice (a solid). When water changes to a solid or a gas, we say it changes to a different state of matter. Even though the water's physical form changes, its molecules stay the same.

International space station is the mission of NASA. It has launched 134 successful space missions.

International space station is a huge place in the space but in the close orbit with all possible facilities for astronauts , scientists and others

The National Aeronautics and Space Administration (NASA) is an acronym for the National Aeronautics as well as Space Administration. NASA was established as a division of the United States government on October 1, 1958. NASA is just in charge of all research and technology related to aviation and space in the United States.

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The power needed to warm the cold outside air to inside temperature in a standard 150 m2 house with an outside temperature of 0°C and an inside room temperature of 20°C is 2076.24 watts.

To calculate the power needed, we first need to calculate the amount of heat needed to warm the air. This is done using the following formula:

Heat = Mass * Specific Heat * Temperature Change

The mass of the air in the house is calculated by multiplying the volume of the house by the density of air. The volume of the house is 150 m2 * 3.28 m/m2 = 486 m3. The density of air at 0°C is 1.225 kg/m3.

The specific heat of air is 1.013 kJ/kg·K. The temperature change is 20°C - 0°C = 20°C.

So, the amount of heat needed to warm the air is 486 m3 * 1.225 kg/m3 * 1.013 kJ/kg·K * 20°C = 9962 kJ.

The power needed to warm the air is then calculated by dividing the amount of heat needed by the time it takes to change the air, which is 5 hours * 3600 seconds/hour = 18000 seconds.

So, the power needed is 9962 kJ / 18000 seconds = 0.554 kJ/second = 2076.24 watts.

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Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

Answer:

Protons+ Neutrons=Atomic weight

Explanation:

Of the three subatomic particles, only protons and neutrons have mass. Electrons orbit the nucleus and their mass is negligible.

Answer:

C. Protons + Neutrons = Atomic weight

Explanation:

The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons.

The velocity of the ball after gaining 20 J of kinetic energy is approximately 10 m/s.

We can use the conservation of energy principle to find the  haste of the ball after gaining 20 J of kinetic energy.

The conservation of energy principle states that the total energy of a unrestricted system remains constant, meaning that energy can not be created or destroyed, only  converted from one form to another.   originally, the ball is at rest, which means that it has no kinetic energy. thus, the total energy of the system is equal to the implicit energy of the ball, which is zero. After gaining 20 J of kinetic energy, the total energy of the system is 20J. where KE is the kinetic energy, m is the mass, and v is the  haste of the ball.  

Rearranging the formula,

we get   v =  √( 2KE/ m)  

Substituting the values given, we get

  v =  √( 2 × 20 J/0.4 kg) ≈ 10 m/ s

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Answer:

it reduces friction

Explanation:

if you put oil or any liquid between the tool it will shift and change the shape as much as it needs to. It will smooth the bumps between the tools gears as they squeeze together making the friction reduce. It will slide and that reduces the friction.

i hope this helps im lowkey just guessing tho so sorry if it doesnt. lmk tho

The grinding, groaning, and screeching sounds coming from the car's brakes let us know it was time to visit the mechanic. Option D

Punctuation is the use of symbols, such as periods, commas, semicolons, exclamation points, and question marks, to separate and organize words into meaningful sentences and clauses. The correct use of punctuation helps to clarify the meaning of a sentence and makes written communication easier to understand.

It's important to note that the rules of punctuation can be complex, and correct usage often depends on the context of the sentence.

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Answer:

Explanation:

in a room with no windows that way it doesnt shatter. Usually a closet... or if you have a basement.sorry but that applies to all them

Explanation:

for the tornadoes

● go to the basement on the lowest floor.

● for heavy protection get under something heavy for example a heavy table.

hail storm

●go and run for a safe place closer _ by like for example garage,under a shed or service station awning.

● do not leave the vehicle until stops hailing.

earthquake

●The best move is getting under a strong table

or a desk

● hold on the shelter if not hold on your neck and head with both arms and hands.

Answer:

the focal length of the mirror is :  \(f=-2.5\,\,cm\)

Explanation:

Use the formula for the formation of image using a divergent mirror and recalling that the image (s') that this mirror formed is virtual, so it is entered as a negative number in the formula. Use the object position (s) as 10, the image position (s') as -2, and derive the value of the focal length:

\(\frac{1}{s} +\frac{1}{s'}=\frac{1}{f}\\\frac{1}{10} +\frac{1}{-2}=\frac{1}{f}\\\frac{1}{10} -\frac{1}{2}=\frac{1}{f}\\\frac{10\,f}{10} -\frac{10\,f}{2}=\frac{10\,f}{f}\\f-5\,f=10\\-4\,f=10\\f=-2.5\,\,cm\)

Answer:

1500 N

Explanation:

• Initial velocity, u = 12 m/s

• Final velocity, v = 20 m/s

• Time taken, t = 6.4 s

• Mass, m = 1200 kg

\(\longrightarrow\) F = ma

a = (v – u)/t, so

\(\longrightarrow\) F = 1200 × (20 – 12)/6.4

\(\longrightarrow\) F = 1200 × 8/6.4

\(\longrightarrow\) F = 1200 × 80/64

\(\longrightarrow\) F = 1200 × 40/32

\(\longrightarrow\) F = 1200 × 20/16

\(\longrightarrow\) F = 300 × 20/4

\(\longrightarrow\) F = 300 × 5

\(\longrightarrow\) F = 1500 N (Answer)

In order to replace the 700-N force P applied at point A, we can use two equivalent systems.

(a) For the first system, we can create an equivalent force-couple system at point C. This means applying a force of 700 N at point C in the opposite direction of the original force P, along with a couple moment. The magnitude of the couple moment would be 700 N multiplied by the perpendicular distance between points A and C.

(b) For the second system, we can replace the force P with a vertical force at point B and a second force at point D. The magnitude of the vertical force at B would be equal to 700 N, and the second force at D would have the same magnitude but in the opposite direction. These forces at B and D should be positioned in a way that the net effect is equivalent to the original force P at point A.

By using either the force-couple system at point C or the system with vertical forces at points B and D, we can achieve the same overall effect as the original force P at point A.

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Answer:

Yes please message me and I will help you

Explanation:

Answer: 27.1 km

Explanation:

Divide 65km/h and 2.4hr

Answer:

Could you explain that more better?

Explanation:

The static friction coefficient must be at least 0.528 for this to occur , parallel to the slope

The force od friction on such an object which is not moving is called static friction. Static friction, which is equivalent to and in the opposite direction of your push, is holding a stationary block in place if you push on it and it doesn't move.

The maximum , limiting level of friction force surfaces is given by the formula FMAX=R FMAX = R, where is the frictional coefficient and R is really the normal reaction of the two surfaces. The frictional coefficient serves as a gauge for surface roughness; the higher the value, the rougher the surface.

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Answer:

Is it a test

Explanation:

The net electric field at point P is zero.

To find the electric field at point P, we need to use the formula E = kq/r^2, where k is the Coulomb constant (9 x 10^9 Nm^2/C^2), q is the magnitude of the charge (1.1 x 10^-11 C in this case), and r is the distance from the charge to point P (5 x 10^-3 m). Since there are two charges of equal magnitude but opposite signs, the total electric field at P is the vector sum of the individual electric fields due to each charge. The direction of the electric field is from positive to negative, so the two electric fields will have opposite directions and cancel each other out.

Therefore, the net electric field at point P is zero.
The Electric Field (E) at point P can be found using the formula E = kQ/r^2, where k is the electrostatic constant (8.99 x 10^9 Nm^2/C^2), Q is the charge magnitude (1.1 x 10^-11 C), and r is the distance from each charge to point P (0.5 x 10^-2 m).

Since both charges have equal magnitudes and point P is located exactly halfway between them, their Electric Fields at point P will cancel each other out due to their opposite directions. Therefore, the net Electric Field (E) at point P will be 0 N/C.

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The strength of the magnetic force is inversely proportional to the square of distance between the magnets. Thus, as the distance increases, force between the magnets decreases.

Magnetic force, is the force generated by magnetic flux lines arised from a magnetic field.  A magnet have a south pole and north pole. There will be repulsive force between two like poles and attractive force between two unlike pole.

The force between two objects is always in inverse proportion with the distance and this is well explained by Coulomb's law of forces.

Thus, F ∝ 1/r² where, r is the distance.

Therefore, as the distance between two magnets increases the magnetic force between them decreases.

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Answer:

High water level during a tide is called High tide.

Low water level during a tide is called Low tide.

Answer:

Velocity is defined as the rate of change of the position of an object.

V=d/T + direction

Answer:

The rate of change of the position of an object.

V=d/T + direction

Explanation: I just looked it up