[15 points] a laboratory sample of sand is formed inside a mold of 0.4 cubic meters. it took 711.2 kg of wet sand (dry mass of sand

Answer:

1,2,5

Explanation:

Therefore, the potential difference across each resistor in this series circuit is 60V.

When resistors are connected in series, the total voltage across the combination is divided proportionally among the resistors based on their individual resistance values. To find the potential difference across each resistor in a series circuit, we can use the following formula:

Potential Difference = (Resistance / Total Resistance) × Total Voltage

Given:

Resistance of each resistor (R₁ and R₂) = 40 ohms

Total Voltage (V) = 120V

Since the resistors are connected in series, the total resistance (\(R_{Total}\)) is the sum of their individual resistances:

\(R_{Total}\) = R₁ + R₂

= 40 ohms + 40 ohms

= 80 ohms

Now we can calculate the potential difference across each resistor:

Potential Difference (V₁) = (R₁ / R₂) × V

= (40 ohms / 80 ohms) × 120V

= 60V

Potential Difference (V₂) = (R₂ / \(R_{Total}\)) × V

= (40 ohms / 80 ohms) × 120V

= 60V

Therefore, the potential difference across each resistor in this series circuit is 60V.

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The dew point for the products of combustion is 52.9 °C.

(a) In practical fuel burners, air in excess of that theoretically required for complete combustion is needed to ensure that combustion is complete and that products of combustion are safe to discharge into the environment. The excess air provides additional oxygen that is used to complete the combustion of any combustibles that were not burned during the initial combustion process. The effect of excess air on the combustion process is that it lowers the temperature of the flame and reduces the concentration of pollutants in the flue gas.

(b) The complete combustion equation is: C10H22 + (32 + 11.5 × 2)O2 → 10CO2 + 11H2O

For complete combustion, the volume percentage of CO2 and O2 in the dry products of combustion is 8% and 10% respectively. The air-fuel ratio by mass can be calculated as follows:

Air-fuel ratio by mass = Mass of air / Mass of fuel

Mass of air = Mass of fuel × (1 + Excess air) Mass of fuel = 1 kg

Excess air = 20% = 0.2Air-fuel ratio by mass = (1 + 0.2) / 1 = 1.2

The dew point for the products of combustion can be calculated as follows:

Dew point = (288.3 / (ln(P / 100) - 42.677)) - 273, where P is the exhaust gas pressure in Pa.

Dew point = (288.3 / (ln(101325 / 100) - 42.677)) - 273Dew point = 52.9 °C

Therefore, the dew point for the products of combustion is 52.9 °C.

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Answer:

15 μF

Explanation:

If two capacitors are in parallel, the equivalent capacitance is equal to the sum of the capacitances, so for the first two capacitors, we get:

C = 10 μF + 20 μF

C = 30 μF

Then, this capacitor C is in series with another capacitor of 30μF. For capacitor in series, we can find the equivalent as follows

Therefore, the answer is 15μF

Communication is the act of conveying information from one person to another. .'Good communication makes it difficult to express wants and needs.'These statement is not true about good communication.

Communication is the act of conveying information from one location, person, or organization to another. There is a sender, a message, and a recipient for every message.

Communication, while it may appear to be a simple notion, is actually a very complex topic. The message's path from sender to the destination might be influenced by a multitude of circumstances.

Hence the option 'A' is right. 'Good communication makes it difficult to express wants and needs this statement is not true about good communication.

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the answer is A

Explanation : took the quiz on edge 2020

An unbalanced force acting on an object results in the object's motion changing. The object may change its speed (speed up or slow down), or it may change its direction. Friction is a force that resists the motion or the tendency toward motion between two objects in contact with each other.

motion

Answer:

motion. FILLER FILLER FILLER

Answer:

The angular acceleration of the wheel of fortune is -0.125 radians per square second.

Explanation:

Let suppose that wheel of fortune is decelerated at constant rate, given that wheel of fortune stops after rotating 540 degrees with an initial tangential velocity of 2 meters per second, the initial angular velocity and the kinematic expression of final angular speed as a function of angular acceleration and position are, respectively:

\(\omega_{o}=\frac{v_{o}}{R}\)

\(\omega^{2} = \omega_{o}^{2} + 2\cdot \alpha \cdot (\theta-\theta_{o})\)

Where:

\(v_{o}\) - Initial tangential velocity, measured in meters per second.

\(R\) - Radius of the wheel of fortune, measured in meters.

\(\omega_{o}\) - Initial angular velocity, measured in radians per second.

\(\omega\) - Final angular velocity, measured in radians per second.

\(\alpha\) - Angular acceleration, measured in radians per square second.

\(\theta\) - Final angular position, measured in radians.

\(\theta_{o}\) - Initial angular position, measured in radians.

Angular acceleration is now cleared in the second expression:

\(\alpha = \frac{\omega^{2}-\omega_{o}^{2}}{2 \cdot (\theta-\theta_{o})}\)

Given that \(v_{o} = 2\,\frac{m}{s}\) and \(R = 1.3\,m\), the initial angular velocity is:

\(\omega_{o} = \frac{2\,\frac{m}{s} }{1.3\,m}\)

\(\omega_{o} = 1.538\,\frac{rad}{s}\)

Now, if \(\omega = 0\,\frac{rad}{s}\), \(\theta_{o} = 0\,rad\) and \(\theta \approx 9.425\,rad\) (180° = π rad), the angular acceleration of the wheel is:

\(\alpha = \frac{\left(0\,\frac{rad}{s} \right)^{2}-\left(1.538\,\frac{rad}{s} \right)^{2}}{2\cdot (9.425\,rad-0\,rad)}\)

\(\alpha = -0.125\,\frac{rad}{s^{2}}\)

The angular acceleration of the wheel of fortune is -0.125 radians per square second.

Answer:

See the answer below

Explanation:

The temperature stops rising when water begins to boil because the heat which causes the rise in temperature is now diverted into changing the phase of the boiling water.

The conversion of substances from one state of matter to another requires energy. Hence, instead of causing a rise in the temperature of the boiling water, the heat is used to convert the liquid water into vapor. The heat thus becomes what is known as the latent heat of vaporization.

Azimuth is referred to as the angular displacement eastward from north

making it an horizontal angle.

This is defined as the distance or change in position of an object or body.

It can be classified as a vector quantity.

Azimuth is an angular measurement in a spherical system. The

displacement occurs eastwards along the northern or southern plain

which makes option D the most appropriate choice.

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Answer:

I thinks it's C...not sure tho

The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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An electric field passes through a line of equal potential at a right angle, or perpendicular to the line.

An electric field always passes through a line of equal potential at a 90-degree angle (perpendicular). This is because electric field lines represent the force experienced by a test charge in the field, and lines of equal potential (equipotential lines) represent regions where the electric potential is constant. Since no work is done in moving a charge along an equipotential line, the electric field must be perpendicular to it to ensure zero work is done.

The electric field is directed from higher potential to lower potential, and the gradient of the potential is perpendicular to the line of equal potential. Therefore, the electric field must be perpendicular to this gradient and thus perpendicular to the line of equal potential.

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Answer:

a ) Its wavelength decreases

Explanation:

When a ray enters into air from glass slab its wavelength decreases.

Speed of the bricks at the top of hill is 6.26 m/s. c.)speed of the bricks at the top of hill is 14.14 m/s. d)minimum compression of spring necessary to get to the top of hill is 6.26 m. e) speed of the bricks at the top of hill with 2 m of initial compression and 15% energy dissipation is 13.04 m/s.

The capacity or power to do work, such as the capacity to move an object by application of force is called energy.

Initial potential energy of compressed spring is:

Ep = 1/2 kx^2 = 1/2 * 500 N/m * (2 m)^2 = 1000 J

k is spring constant, x is compression of the spring, and J is unit of energy in joules.

Final potential energy of the bricks is:

Ep = mgh = 100 N * 9.81 m/s^2 * 2 m = 1962 J

Ep = Ep

1/2 kx^2 = mgh

v = sqrt(2gh) = sqrt(2 * 9.81 m/s^2 * 2 m) = 6.26 m/s

Therefore, the speed of the bricks at the top of the hill is 6.26 m/s.

c.  Initial potential energy of compressed spring is: 1000 J

Ek = Ep = 1000 J

Kinetic energy of the bricks is given by:

Ek = 1/2 mv^2

1000 J = 1/2 * 100 N * v^2

v = sqrt(200 / 1) = 14.14 m/s

Therefore, the speed of the bricks at the top of the hill is 14.14 m/s.

d.  As, Ep = m g h

where m is mass of the bricks, g is acceleration due to gravity, and h is  height of the hill.

Ep = 100 N * 9.81 m/s^2 * 2 m = 1962 J

Ep = 1/2 kx^2 = 1962 J

1/2 * 500 N/m * x^2 = 1962 J

x = sqrt(2 * 1962 J / 500 N/m) = 6.26 m

Therefore, the minimum compression of the spring necessary to get to the top of the hill is 6.26 m.

e. If 15% of the energy is dissipated through friction, final kinetic energy of the bricks at the top of the hill will be 85% of initial potential energy of the compressed spring. Therefore,

0.85 * 1000 J = 1/2 mv^2

v = sqrt(170 / 1) = 13.04 m/s

Therefore, the speed of the bricks at the top of the hill with 2 m of initial compression and 15% energy dissipation is 13.04 m/s.

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The development of our current model of the atom evolved over centuries, starting with the ancient Greeks' conceptualization of the atom as an indivisible particle.

Around the fifth century BCE, the Greeks became the first people to put forth the idea of the atom. Democritus and other philosophers proposed the idea that matter is made up of tiny, indivisible pieces called atoms, but there was no experimental support for this theory at the time. Although it survived for centuries, this idea did not significantly change until the 19th century.

Scientific developments in the 19th century led to a deeper comprehension of atoms. With notable contributions from Michael Faraday's work on electromagnetic induction and Benjamin Franklin's electricity tests, scientists discovered the presence of electrical charges.

Groundbreaking investigations that transformed our understanding of the atom took place in the early 20th century. The electron, a negatively charged particle inside the atom, was discovered in 1897 as a result of J.J. Thomson's cathode ray tube studies. Atoms are shown to have a small, dense, positively charged nucleus that is around by negatively charged electrons in a large empty region by Ernest Rutherford's gold foil experiment in 1911.

The Rutherford model, sometimes known as the planetary model, was created in response to the discovery of the nucleus. This model, however, encountered problems since it was unable to explain the stability of atoms and the behavior of electrons. Researchers like Werner Heisenberg and Erwin Schrödinger made significant contributions to the development of quantum mechanics in the 1920s and 1930s.

The wave-particle duality and quantum mechanical concepts are both included in the current model of the atom, also referred to as the quantum mechanical model. In orbitals, which are areas of probability where electrons are most likely to be located, it says that electrons exist. Around the nucleus, these orbitals are arranged into energy levels or shells. The behavior of subatomic particles like protons and neutrons, which make up the nucleus, is also taken into consideration by the model.

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Answer:

the answer is A

Explanation:

pH is a measure of how acidic/basic water

According to the theory of relativity, time dilation occurs when an object is moving at high speeds, meaning time appears to slow down for that object. Therefore, for the spaceship traveling at 99.99% of the speed of light, time will appear to slow down.

Assuming the spaceship travels at this speed for the entire trip, the round-trip journey of 200 light-years will take about 14.14 years from the perspective of the spaceship. However, from the perspective of Earth, time will appear to pass slower for the spaceship, meaning more time will have passed on Earth.

Using the equation for time dilation, which is t = t0 / sqrt(1 - v^2/c^2), where t0 is the time on Earth, v is the velocity of the spaceship, and c is the speed of light, we can calculate the time difference between Earth and the spaceship.

Plugging in the values for the spaceship's velocity and distance traveled, we get:

t = 200 / (0.0001 * c) * sqrt(1 - 0.9999^2)

t ≈ 282.8 years

This means that 282.8 years will have passed on Earth while the spaceship completes its round-trip journey. Therefore, the year on Earth when the spaceship returns will be 2120 + 282.8, which is approximately 2402.

So the answer to your question is not one of the options given, but it would be around the year 2402 on Earth when the spaceship returns from its journey.

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Option c. The speed of light in water compared to the speed of light in a vacuum is slower.

Light refers to electromagnetic radiation of any wavelength, whether it is visible or not. Light is a kind of energy that travels in waves. This implies that light, like other waves, has both frequency and wavelength. A vacuum is a space that is entirely devoid of matter. There is no air, liquid, or solid in a vacuum. The pressure in a vacuum is also zero. A vacuum is a place where the atmosphere's pressure is lower than the atmospheric pressure at sea level.

Speed of light in water compared to the speed of light in vacuum. The speed of light in vacuum is approximately 300,000 kilometers per second (km/s), whereas the speed of light in water is around 225,000 km/s. Light travels slower in water than in a vacuum, which means that the speed of light in water is slower than the speed of light in vacuum. Therefore, option c. slower is the correct answer.

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1. Wave number can be calculated by using the formula:

k = 2π/λ, where λ is the wavelength of the wave.

The equation of the wave is y(x,t) = 2 cos(300t + 0.6x).

Comparing with the standard equation of wave:

y(x,t) = A cos(kx - ωt + φ)

Hence, the wave number, k, which is equal to 0.6.

2. The angular frequency, ω, is given by the formula:

ω = 2πf, where f is the frequency of the wave.

Hence, the angular frequency is 300 radians per second.

3. The speed of the wave, v, is given by the formula:

v = λf = ω/k

The speed of the wave is:

v = (2π/0.6) * (1/300)

v ≈ 35.4 m/s

4. The direction of the wave can be determined by looking at the coefficient of x in the equation:

y(x,t) = 2 cos (300t + 0.6x)

Since the coefficient of x is positive, the wave is traveling in the positive x direction.

5. The frequency of the wave, f, is given by the formula:

f = ω/2π

Therefore, the frequency is 300/2π ≈ 47.7 Hz.

6. The amplitude of the wave is

7. The frequency is already determined above in part 5

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The speed of the wind is 23 km/h, and the speed of the plane in still air is 135 km/h.

Let's assume the speed of the plane in still air is represented by "P" and the speed of the wind is represented by "W".

1. When flying to Kampala with a tailwind, the plane's effective speed is the sum of its airspeed (P) and the speed of the wind (W). Therefore, the equation becomes:

  P + W = 158 km/h     ----(1)

2. On the return trip, the plane is flying against the wind, so its effective speed is the difference between its airspeed (P) and the speed of the wind (W). Thus, the equation becomes:

  P - W = 112 km/h     ----(2)

To find the values of P and W, we can solve these two equations simultaneously.

Adding equation (1) and equation (2) gives:

(P + W) + (P - W) = 158 + 112

2P = 270

P = 135 km/h

Substituting the value of P into equation (1) gives:

135 + W = 158

W = 158 - 135

W = 23 km/h

The speed of the wind is 23 km/h, and the speed of the plane in still air is 135 km/h.

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After connecting the conducting wire, the spheres will redistribute charges until they both have a charge of -1C.

To determine the new charges on the spheres, we need to consider the principle of charge conservation, which states that the total charge before and after an interaction remains the same.

Let's assume that the spheres have charges Q1 and Q2 initially. In this case, Q1 = -3C and Q2 = +1C.

When a conducting wire is connected between the spheres, charge can redistribute until the system reaches equilibrium. Since the spheres are conducting, charges are free to move within them.

In the final state, the charges on the spheres will redistribute to reach a new equilibrium. Let's assume the new charges on the spheres are Q1' and Q2'.

According to the principle of charge conservation, the total charge before and after the connection remains the same:

Initial total charge = Q1 + Q2 = -3C + 1C = -2C

Final total charge = Q1' + Q2'

Since the total charge remains the same, we can write the equation:

Q1' + Q2' = -2C

Since the spheres are of equal size, we can assume that the charges redistribute equally:

Q1' = -1C

Q2' = -1C

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The question probable may be:

A conducting wire is connected between two conducting spheres of equal size have a charge of -3C and +1C respectively. Find out the new charge on each sphere ?

Answer:

welding metal

Explanation:

Answer:

it is magma chamber

Explanation:

A load that will convert all of the delivered power into another form of energy is called a "pure" or "matched" load.

When a power source, such as a generator or battery, is connected to a load, the load will convert some of the electrical energy into another form, such as heat, light, or mechanical energy.

However, not all loads are able to convert all of the delivered power into another form of energy.

Some of the power may be reflected back towards the source or dissipated in the form of electromagnetic waves.

A pure or matched load is a type of load that is designed to match the impedance of the source, meaning that the load resistance is equal to the source resistance.

When a pure load is connected to a power source, all of the delivered power will be converted into another form of energy, without any power being reflected back towards the source.

To summarize, a load that will convert all of the delivered power into another form of energy is a pure or matched load

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The angular momentum around the center of the merry-go-round is 512.5 kg m² / s.

The product of an object's mass and its velocity is its momentum. Momentum exists in all mass-moving objects. Only the fact that it deals with rotating or spinning objects makes angular momentum different.

L= m * r² (where m is mass and r is radius)

= 50 * 2.5²

= 312.5 kg m²

Now

w = v/r (where v is speed)

= 4.1 m/s / 2.5 m

= 1.64 rev/sec

So finally

The momentum = I * w

= 312.5 * 1.64

= 512.5 kg m² / s

The merry-go-round's initial angular momentum is 0 because it is at rest. The merry-go-round and child's angular velocity is zero (pivoted) if R is the merry-go-round's radius and I is its moment of inertia. In general, the centripetal force you experience increases with the size of the circle you move in.  

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The question is incomplete complete question is given below

A little girl is going on the merry-go-round for the first time, and wants her 50 kg mother to stand next to her on the ride, 2.5 m from the merry-go-round's center. Part A If her mother's speed is 4.1 m/s when the ride is in motion, what is her angular momentum around the center of the merry-go-round ?

In waste treatment plants, there are several common types of sedimentation tanks .some of the most common sedimentation tanks and their purposes: Primary Sedimentation Tank , Secondary Sedimentation Tank ,Tertiary Sedimentation Tank:

1. Primary Sedimentation Tank: The primary sedimentation tank, also known as a primary clarifier or primary settling tank, is designed to remove settleable solids and heavy particles from wastewater. It allows the heavier particles to settle at the bottom of the tank, forming sludge, while the lighter particles float to the top and are skimmed off. The primary sedimentation tank helps in the removal of large suspended solids and organic matter.

2. Secondary Sedimentation Tank: The secondary sedimentation tank, also called a secondary clarifier or final settling tank, is used in biological treatment processes. It receives the treated wastewater from the biological reactor, such as an activated sludge process or a trickling filter, and allows the remaining suspended solids, microorganisms, and flocs to settle. This tank separates the treated wastewater from the biological sludge or biomass before the water is discharged or subjected to further treatment.

3. Tertiary Sedimentation Tank: Tertiary sedimentation tanks, also known as tertiary clarifiers or polishing basins, are used for additional treatment after the secondary sedimentation tank. These tanks further remove fine suspended solids, residual organic matter, and nutrients, such as phosphorus or nitrogen, from the wastewater. Tertiary treatment is often required to meet strict effluent quality standards before the wastewater is discharged into the environment.

4. Imhoff Tank: An Imhoff tank is a type of sedimentation tank used for the treatment of sludge or sewage solids. It consists of two chambers: an upper chamber for settling and a lower chamber for anaerobic digestion of the settled sludge. The Imhoff tank allows for the natural decomposition of organic solids in the lower chamber, reducing the volume of sludge and producing biogas.

These sedimentation tanks play a crucial role in wastewater treatment by allowing the separation and removal of solids from the wastewater, improving the overall quality of the treated effluent. The specific design and purpose of each tank may vary depending on the treatment process and the requirements of the wastewater treatment plant.

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Answer:

From liquid to solid or to solid or liquid the transition has to cross the grey zone.

Explanation:

hope it helps<

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______________________________________

Answer: left side

Explanation:

Given

Block of wood is pushed to the right

As friction always resist the motion, it must be acting towards the left side to stop the block