What is the minimum diameter of a steel wire if it is to support a mass of 80 kg? the elastic limit of steel is 5.0*10^8 pa

Answer:

Doubling the speed.

E - M v^2

M = W / g     energy is proportional to weight

But energy is proportional to v^2

-type of data did the scientist record was qualitative data.

-tool the scientist would use is electronic temp probe

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Answer:

The first one is qualitative data

The second one is electronic temp probe

Explanation:

The current through wet hands when in contact with a 120 V electrical circuit would be 120 milliamps (mA).

Voltage (V) = 120 V

Resistance (R) = 1,000 ohms

According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them. According to Ohm's Law, we can compute the electrical current in a circuit by dividing the voltage by the resistance. If the resistance is reduced, the current will alter.

Calculating the current by using Ohm's law -

I = V / R

Substituting the values:

I = 120 / 1,000

= 0.12 A

Converting 0.12 A to milliamps by multiplying by 1,000 -

= 0.12 x 1,000

= 120

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Answer:

The acceleration of the rifle equals the force that the bullet exerts on the rifle divided by the mass of the rifle. The two forces are equal, but since the mass of the rifle is much greater than the mass of the bullet, the acceleration of the rifle is much less than the bullet's acceleration.

Following the image of the ball that have been shown;

1. Potential energy

2. Kinetic energy

3. Kinetic energy

4. Potential energy

5. Kinetic energy

6. Kinetic energy

7. Kinetic energy

Due to its position or elevation, an object has potential energy while it is at rest or is elevated above the ground. Depending on the circumstances, this potential energy may either be elastic or gravitational.

Kinetic energy, or the energy connected to motion, is present when an item is in motion. An object's kinetic energy is determined by its mass and velocity .

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Answer:

1: Potential and kinetic

2: Potential and kinetic

3: Potential and kinetic

4: potential

5: Potential and kinetic

6: Potential and kinetic

7: NEITHER

Explanation:

4 is potential because its the highest point

7 is neither because the question states "the image shows the path of a ball from the time it's thrown to the time it lands on the ground" so... 7 is when the ball has landed on the ground. therefore it has neither potential nor kinetic because it is resting.

The final speed of the train is 45 m/s or 162 km/hr approximately.

The given problem states that a train moves from rest to a constant speed in 30 seconds. We are required to calculate the speed of the train at the end of 30 seconds. Also, it is given that the train is accelerating at a constant rate of 1.5 m/s2 throughout the motion. So, let’s calculate the final speed of the train. Using the kinematic equation of motion, we havev = u + at. Where v is the final velocity u is the initial velocity a is the acceleration t is the time taken Given,u = 0 m/sa = 1.5 m/s2t = 30 s. Therefore ,v = 0 + 1.5 × 30v = 45 m/s. Therefore, the final speed of the train is 45 m/s  or 162 km/hr approximately. Now, let’s understand the concepts of constant speed and acceleration. The constant speed is the speed at which an object moves without changing the rate. In other words, the object moves at the same speed and covers equal distances in equal intervals of time. On the other hand, acceleration is the rate at which the object changes its speed. So, the train is said to be accelerating when it is changing its speed. However, once the train reaches its final speed, it is said to be moving at a constant speed and not accelerating anymore. This is because its speed is not changing and it is covering equal distances in equal intervals of time.The given problem helps in understanding that acceleration is a vector quantity as it has both magnitude and direction. It is measured in m/s2. Similarly, speed is also a scalar quantity as it has only magnitude and no direction. It is measured in m/s.

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(1) The time taken by the cab to meet the bus is 18.96 seconds.

(2) The distance the cab has travelled to catch-up with the bus is 718.96 m.

The distance between the bus and the cab when the cab begins to move is calculated as follows;

D = speed x time

D = 30 m/s x 5 s

D = 150 m

The velocity of the cab when it begins to move is calculated as follows;

v = at

(v - 30)t = D

(at - 30)t = 150

(2t - 30)t = 150

2t² - 30t = 150

2t² - 30t - 150 = 0

solve the quadratic equation using formula method

t = 18.96 seconds

D =  vt

D = 2t²

D = 2(18.96²)

D = 718.96 m

Thus, the time taken by the cab to meet the bus is 18.96 seconds. The distance the cab has travelled to catch-up with the bus is 718.96 m.

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The most likely range of values for Hubble's constant is 67.66 ± 0.42 km/s/ M p c. The uncertainty in its value arises due to a number of factors, including measurement errors and assumptions made in the calculation of distances and velocities.

The uncertainty in its value arises due to a number of factors, including measurement errors and assumptions made in the calculation of distances and velocities.

The uncertainties in the value of Hubble's constant are primarily due to measurement errors and assumptions made in the calculation of distances and velocities.

For example, the calculation of distances to galaxies is based on the assumption that they are standard candles, meaning that their absolute magnitude can be determined based on their observed luminosity.

However, there are a number of factors that can affect the luminosity of galaxies, such as dust and gas clouds, which can lead to errors in the distance calculations.

Velocities are also difficult to measure accurately, particularly for galaxies that are very far away. This can lead to errors in the calculation of the expansion rate of the universe and thus the value of Hubble's constant.

Additionally, there may be other sources of error that are not yet fully understood, such as the effects of dark matter and dark energy on the expansion rate of the universe.

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Answer:

Decreasing

Explanation:

Answer:

C. photons

hope this helps

have a good day :)

Explanation:

Answer:

The answer would be c

Explanation:

Answer:

Three (3).

Explanation:

The octet rule is a rule in chemistry that states that, chemical elements would either gain or loss electrons in their outermost shell in order to attain a stable electronic configuration i.e having eight (8) valence electrons in their outermost shell such as chemical elements found in group 8 (2-8-8) known as noble gas.

A phosphorus atom needs to gain three (3) electrons to achieve a full octet because the atomic number of phosphorus is 15 and as such it has the electronic configuration of 2-8-5 and needs three electron in order to become a stable element.

Solar energy is a renewable energy resource that can provide suitable power for the world in general. It is one of the most abundant energy resources on Earth. Amongst the reasons why solar energy is a viable alternative energy are:

The sun is the largest source of free energy you can utilize on this planet. It can provide enough power that can supply the world’s electricity needs for a year.

One of the primary benefits of utilizing solar energy is that it can provide a clean, green source of power. It is a self-sufficient renewable energy source.

Therefore, solar energy is a viable alternative energy source because it is a renewable source of energy.

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Answer:

It has an endless supply

Explanation:

Pearson Connexus 2023.

Unlike a nonrenewable source of energy such as fossil fuels, solar power is a renewable source of energy that will not run out.

Answer:

Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

Explanation:

Answer: 1102.5 meters

Explanation:

At a depth of 500 meters in the mine, the estimated vertical stress is 13.5 MPa, and the estimated horizontal stress is 11.57 MPa. Specific details to consider are Chalk Strength, Chalk Permeability, Chalk Heterogeneity.

Before proceeding with the excavation of the cavern beneath the sea, the main geological information that would be important to have includes the properties and characteristics of the chalk formation. Some specific details to consider are:

a) Chalk Strength: It is essential to determine the strength and stability of the chalk formation to ensure that it can support the excavation without collapsing or experiencing excessive deformation. This would involve assessing parameters such as the cohesion, friction angle, and compressive strength of the chalk.

b) Chalk Permeability: Understanding the permeability of the chalk is crucial, especially since the cavern will be beneath the sea. The permeability will impact the water flow within the chalk and may affect stability, seepage, and potential groundwater inflow into the excavation.

c) Chalk Heterogeneity: Chalk formations can exhibit variations in their composition, including the presence of layers or discontinuities such as faults or joints. Understanding the geological structure and heterogeneity of the chalk will help in assessing the potential for rock mass instability, water ingress, or the presence of other geological hazards.

To estimate the vertical and horizontal in-situ stresses at a depth of 500 meters in the mine, we can use the principles of rock mechanics and consider the given parameters.

Vertical Stress:

The vertical stress is the stress component acting vertically downward due to the weight of the overlying rock. It can be calculated using the average unit weight of the rock and the depth.

Vertical Stress = Unit Weight of Rock × Depth

Vertical Stress = 27 kN/m³ × 500 m

Vertical Stress = 13,500 kN/m² or 13.5 MPa

Horizontal Stress:

The horizontal stress can be estimated using the in-situ stress ratio, which is influenced by Poisson's ratio. The relationship between the horizontal and vertical stresses can be expressed as:

Horizontal Stress = Vertical Stress × (2 × Poisson's Ratio) / (1 - Poisson's Ratio)

Horizontal Stress = 13.5 MPa × (2 × 0.3) / (1 - 0.3)

Horizontal Stress = 13.5 MPa × 0.6 / 0.7

Horizontal Stress = 11.57 MPa

Therefore, at a depth of 500 meters in the mine, the estimated vertical stress is 13.5 MPa, and the estimated horizontal stress is 11.57 MPa.

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The power angle after five cycles would be approximately 8.4 degrees after the fault has occurred.

The power of a 3-phase, 50 Hz, 500 MVA, 13.8 kV, 4-pole generator with an H constant of 5 p.u. is P=0.7 p.u. at a power angle of 8=12 degrees, according to the problem statement. The fault reduces the generator's electrical power output by 70%. As a result, the real power being produced by the generator is reduced to 0.3 pu, which is equal to 300 MW, which is 70% of 0.7 pu or 700 MW. The mechanical power produced by the generator, on the other hand, stays the same at 0.35 p.u. This mechanical power is converted to electrical power.The power angle delta is given by sin delta = (Pm - P)/(Xs*Vt^2), where Pm is the mechanical power produced by the generator, P is the electrical power produced by the generator, Xs is the synchronous reactance, and Vt is the voltage at the generator's terminals. Therefore, sin delta = (0.35-0.3)/(1.2*13.8^2) = 0.0006053, since Xs is 1.2 pu for a generator with an H constant of 5 and the voltage at the generator's terminals is 13.8 kV. This implies delta = 0.0349 radians, or approximately 2 degrees, since sin^-1(0.0006053) = 0.0349 radians or 2 degrees.

For the first five cycles, the power angle is given by delta = delta 0 + (H*(1-P 0/P)*2pi*f/120), where delta 0 is the power angle at the time of the fault, P 0 is the electrical power generated at the time of the fault, H is the machine's H constant, f is the frequency of the power system, and pi is approximately equal to 22/7. Substituting the provided values in the above equation, we have delta = 0.0349 + (5*(1-0.3/0.7)*2pi*50/120*5), where delta 0 is 0.0349 radians, H is 5 pu, P 0 is 0.7 pu, and f is 50 Hz.

Substituting the above values we get delta = 0.1466 radians or approximately 8.4 degrees.

Therefore, the power angle after five cycles would be approximately 8.4 degrees after the fault has occurred.

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With a wound rotor induction motor, the torque reaches its maximum when the rotor and stator currents are in phase with each other. When the currents are in phase, it means that the rotor winding and the stator winding are perfectly aligned with respect to the magnetic field. This alignment results in the maximum torque production.

When the rotor and stator currents are in phase, the rotor winding creates a magnetic field that interacts efficiently with the stator winding's magnetic field. The resulting magnetic forces generate a maximum torque, allowing the motor to produce its highest rotational output.

On the other hand, if the rotor and stator currents are out of phase, such as when there is a phase shift or when reduced voltage is applied, the torque production decreases. This can occur when the rotor resistance is increased or when voltage is reduced using external control methods.

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Answer:

Zero.

Explanation:

Work done by the weight is Zero, since the force and displacement are at right angles to each other.

Electrical energy which is provided to the pump is transformed into gravitational potential energy and into sound in equal portions. Thus, the correct option is C.

The principle of conservation of energy establishes that the energy cannot be created nor it can be lost alone. Energy can only be transformed, based on the principle of conservation of energy, the mechanical energy of the system is established as formed by the kinetic energy and the different in potential energies.

In this case, the electrical energy of the system is transformed into kinetic energy to raise the water temperature, when it reaches a height level where its actual speed is zero, all the mechanical energy is transformed into gravitational potential energy.

Therefore, the correct option is C.

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Your question is incomplete, most probably the complete question is:

Ahmad uses an electric pump to raise water to a reservoir on his farm. The pump is very noisy, and Ahmad’s uncle, who is an engineer, told him that only 50\%50%50, percent of the energy it consumes is delivered as gravitational potential energy to the water. When Ahmad turns off the pump, he notices that when he touches it, it has not warmed up.

What happened to the electrical energy provided to the pump?

a. It mostly transformed into gravitational potential energy, and a small portion transformed into sound.

b. It mostly transformed into sound, and a small portion transformed into gravitational potential energy.

c. It transformed into gravitational potential energy and into sound in equal portions.

d. It mostly transformed into sound energy and gravitational potential energy, and a small portion disappeared.

The magnitude of the displacement vector of the bee will be 2 km. Because the distance between the endpoints is 2km.

A displacement is a vector in engineering and mechanics that has a length equal to the smallest distance between a point P's initial and final positions. It is a vector quantity. The SI unit of the displacement is the meter.

A honeybee leaves the hive and travels a total distance of 2 km before returning to the hive.

The bee's displacement vector will be 2 kilometers in length. Mostly due to the 2 kilometers between the terminals.

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Answer:

the answer of this question is B

The reason why the feather does not accelerate at this rate when dropped near the surface of Earth is because of Air friction acts on the feather.

The Gravity or its acceleration due to it is regarded as 9.81 meters per second square, on the earth surface, because of the size of Earth and the distance we are on its surface from its center.

In space, gravity are said to be constant.

Conclusively, due to air resistance, acceleration throughout a fall gets less than gravity because it affects the movement of the falling object by slowing it down.

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8.2 X \(10^{5}\)C quantity of charge is supplied by the battery to charge the capacitors.

\(C_{net } = \frac{C_{1} C_{2} }{C_{1} +C_{2} }\)

       = \(\frac{3\times 4}{3+4}\)

     = 12/17

    = 1.714μ F

Q = CV

     = 1.714x \(10^{6}\) F X 48V

     = 82.27x \(10^{6}\)C

     = 8.2 X \(10^{5}\)C

A two-terminal electrical device known as a capacitor is capable of storing energy in the form of an electric charge. It is made up of two electrical wires that are spaced apart by a certain amount. Suction may be used to fill the space between the conductors, or a dielectric, an insulating substance, may be used instead. Capacitance is the term used to describe a capacitor's capacity to hold charges.

Pairs of opposing charges are held apart in capacitors to retain energy. A parallel plate capacitor has the most basic construction and is made up of two metal plates with a space in between them. However, many capacitor types are produced in a wide variety of shapes, sizes, lengths, girths, and materials.

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The equilibrium configuration at which the torque vanishes is θ=π/2, and deviations from equilibrium can be parameterized as θ=π/2−ϵ using power series expansions.

The term "equilibrium configuration" refers to the state of a physical system in which the net force and net torque acting on the system are both zero, and the system is not undergoing any acceleration or rotation.

A power series expansion is a mathematical technique used to express a function as an infinite sum of terms, where each term is a power of a variable multiplied by a coefficient. Power series expansions are often used in calculus and mathematical analysis to approximate functions and solve differential equations.

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According to the information provided, it should be highlighted that the 750 seniors in the school and made up population of interest, and interest parameter is percentage of seniors who intend to attend prom.

= 36/50 = 0.72

Q = 1 - 0.72 = 0.28

n = 50

As a result, the confidence interval will be equal to 50 squared times the combination of 0.72 and 0.28. This amounts to 0.0635.

For a big sample randomly selected among 750 seniors, the interval here on context suggests that we are 90% certain that the fraction of those who desire to attend the prom falls within the interval.

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The flaw in the experiment on water recycling is that the student did not see water dripping off the glass plate as expected. To correct this flaw, the student should use a cold glass plate instead of a hot glass plate.

The correct option to the given question is option 4.

When the student holds the hot glass plate above the beaker, the water vapor in the atmosphere will come into contact with the cold surface of the plate and condense, forming water droplets. However, if the glass plate is already hot, it will not be able to cool down the water vapor quickly enough for condensation to occur.

By using a cold glass plate, the temperature difference between the plate and the water vapor will be greater, allowing for faster condensation. This will result in water droplets forming on the glass plate and dripping off, demonstrating the process of water recycling through the atmosphere.

Therefore, the correct method to correct the flaw in this experiment is to use a cold glass plate instead of a hot glass plate. This will enable the student to observe water droplets on the glass plate as expected.

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The solid forms of ice last longer because there is more weight with less surface area. This statement is false.

Factors like temperature, shape, size, humidity and impurities are some of the factor decides the time for which the ice survives. Even though larger ice particles may have more surface area than solid forms of ice, this does not always imply that they will persist longer.

In reality, due to the insulating effect of the ice itself, larger ice formations, like glaciers, can melt more quickly. In the end, a complex combination of physical, chemical, and environmental elements determines how long ice will last.

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Answer:

6.3m/s

Explanation:

Given parameters:

Mass of the ball  = 0.5kg

Height  = 2m

Unknown:

Velocity when the ball hits the ground  = ?

Solution:

Since the potential  energy is transformed into kinetic energy;

            P.E  = K.E

              mgh  = \(\frac{1}{2}\) m v²

     cancelling m;

               gh  =  \(\frac{1}{2}\) v²

                v² = 2gh

                v  = √2gh

Insert the parameters and solve;

               v  = √2gh  = √ 2 x 9.8 x 2  = 6.3m/s

From there, there was a strong and compact radio signal. There is a supermassive black hole at the Centre of our own Milky Way, according to the evidence that is most compelling.

There is a supermassive black hole in the Centre of the Milky Way that is four million times as big as the sun. Although we haven't really seen in radio signal, we are aware of its presence thanks to a number of pieces of evidence. First of all, a strong and compact radio signal is emanating from that area. Is called Milky Way.

A black hole is an area of spacetime where gravity is so intense that nothing can escape from radio signal, not even electromagnetic radiation like light. A sufficiently compact mass can distort spacetime to create a black hole, according to general relativity theory.

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