A car with a mass of 1500 kg travelling at 5m / s is accelerated for 10.0 s to a speed of 25m / s What force was required? The coefficient of rolling kinetic friction was 0.009.

sensory nerve - spinal cord - motor nerve - effector work together to cause the reflex to lift the foot.

The spinal cord is a lengthy band of tissue that resembles a tube. It ties your brain and lower back together. Your spinal cord relays nerve messages back and forth from your brain to your body. You can experience feelings and move your body thanks to these nerve transmissions.

Nerve function is lost beneath the site of damage. A spinal cord damage higher up can paralyze the majority of the body and all limbs (called tetraplegia or quadriplegia). Legs and lower body paralysis may result from a lower spinal cord injury (called paraplegia).

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answer:

the electromagnetic force

explanation:

The parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.

An electric generator is a device that converts motive power into electric power for use in an external circuit.

Parts of electric generators include the following;

These parts of electric generator helps in the generation of electricity or conversion of electric energy into mechanical energy or light energy or chemical energy.

Thus, the parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.

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Answer:

armature

permanent magnet

electromagnet

brushes

slip rings

Explanation:

edge 2022-2023

The inductance of an air-filled cylindrical inductor is 19.4 mH and the number of turns for a core filled with iron is 588 turns

Inductance is a property of an electrical circuit or component that causes it to resist changes in the current flowing through it. It is measured in henries and is a function of the number of turns and the size of the core material. Inductance is essentially a measure of the amount of energy that is stored in an electrical circuit.

(a) The inductance of an air-filled cylindrical inductor can be calculated using the following equation:
L = (μ₀*N²*A)/l
Given:

N = 2800 turns
A = πr² = π(2.5 cm/2)² = 19.6 cm²
l = 29.7 cm
L = (4π*10⁻⁷*2800²*19.6)/29.7
L = 19.4 mH

(b) To calculate the number of turns for a core filled with iron, we need to use the following equation:
N = (L*l)/(μ*A)
Where μ is the magnetic permeability of the iron core.
Given:
L = 19.4 mH
l = 29.7 cm
A = 19.6 cm²
μ = 1200 (magnetic permeability of iron)
N = (19.4 mH*29.7 cm)/(1200*19.6 cm²)
N = 588 turns

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The Wireless Spectrum spans a wide range of frequencies, from as low as 9 KHz to as high as 300 GHz. This spectrum is a limited resource, and as demand for wireless communications continues to grow, there is an increasing need to manage and allocate the available frequencies effectively.

Different frequencies are used for different wireless technologies, with lower frequencies typically used for long-range communication and higher frequencies used for shorter-range communication with higher data rates. In order to avoid interference between different wireless systems, regulators allocate specific frequency bands for specific uses, such as cellular networks, Wi-Fi, and Bluetooth. With the ongoing development of new wireless technologies, including 5G and IoT, managing the Wireless Spectrum and allocating frequencies will remain a critical challenge for regulators and industry stakeholders alike.

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Resonance has a significant effect on the quality, tone, and intelligibility of speech, making it a critical component of effective communication.

Resonance is an important property of the vocal tract that plays a significant role in speech. Resonance is the process by which the vocal tract amplifies sound waves produced by the vocal cords. When the vocal tract is energized by airflow from the lungs, it resonates in a specific way, amplifying certain frequencies and reducing others.

This resonance helps to shape the sound produced by the vocal cords, giving it a distinct quality that contributes to the intelligibility and naturalness of speech. Resonance also allows us to produce different vocal tones and to emphasize certain sounds or words in our speech.

In summary, resonance has a significant effect on the quality, tone, and intelligibility of speech, making it a critical component of effective communication.

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The shortest length of the highway is 92.64 m and the angle is 32.6°.

The distance is found by Pythagoras theorem,

Distance = \(\sqrt{50^{2} +78^{2} }\)

               = \(\sqrt{2500+6084}\)

               = \(\sqrt{8584}\)

               = 92.64 m

tan(α) = 50/78

tan(α) = 0.64

α = tan⁻ 0.64

α = 32.6°

Hence, the shortest length of the highway is 92.64 m and the angle is 32.6°.

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The amplitude of a wave is directly related to the energy carried by the wave. This is because the amplitude of a wave is defined as the distance between the rest position of the wave and its highest or lowest point.

As the amplitude of a wave increases, the energy carried by the wave also increases .In the animation, we can see that as the amplitude of the wave increases, the height of the wave increases as well. This means that more energy is being transferred through the wave. Conversely, when the amplitude of the wave decreases, the height of the wave decreases and the energy carried by the wave decreases as well.

This relationship between amplitude and energy can be further illustrated by considering sound waves. A louder sound corresponds to a higher amplitude sound wave, which carries more energy. Similarly, a quieter sound corresponds to a lower amplitude sound wave, which carries less energy.

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Answer:

B

Explanation:

Answer:

Magnitude = 8.6

Angle = 324.5 degree from + X axis in counter clock  wise direction.

Explanation:

X component of B, Bx = 7

Y component of B, By = - 5

The magnitude of the resultant is  

\(B =\sqrt{7^{2}+(-5)^2}\\\\B =\sqrt{49+ 25}\\\\B = 8.6\)

The angle is given by

\(tan\theta=\frac{By}{Bx}\\\\tan\theta = \frac {-5}{7}\\\\\theta = 324.5^{o}\)

The image will form at the focal point

1/object + 1/image = 1/focal

If the object distance is infinite then the image distance equals the focal distance

The amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.

The entire quantity of kinetic energy found in the particles of an object or material is referred to as thermal energy. It is a type of energy connected to atomic and molecular motion within a substance. Conduction, convection, and radiation are a few examples of mechanisms that can be used to transmit this energy from one item to another. An object's thermal energy content is inversely related to its temperature, with higher temperatures denoting a higher thermal energy content. Through the transformation of heat energy into mechanical energy, thermal energy is employed in a variety of processes, including heating houses, preparing food, and creating electricity.

The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:

Q = m x c x ΔT

Where:

Q = amount of thermal energy in Joules (J)

m = mass of the substance in grams (g)

c = specific heat capacity of the substance in J/g°C

ΔT = change in temperature in °C (final temperature - initial temperature)

Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:

Q = 20g x 0.385 J/g°C x (50°C - 20°C)

Q = 20g x 0.385 J/g°C x 30°C

Q = 231 J

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The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:

Q = m x c x ΔT

Where:

Q = amount of thermal energy in Joules (J)

m = mass of the substance in grams (g)

c = specific heat capacity of the substance in J/g°C

ΔT = change in temperature in °C (final temperature - initial temperature)

Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:

Q = 20g x 0.385 J/g°C x (50°C - 20°C)

Q = 20g x 0.385 J/g°C x 30°C

Q = 231 J

Therefore, the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.

a)A ball is thrown at an angle of 40 degrees, the ball reach the height  is 8.24m

b)Time taken by the ball in the air is 2.620 s.

c) far form the edge of the building will it land is 86.24m.

a) Maximum height is given as :

H = (v₀ sinθ)²/2g

H = (20 x 0.642)²/(2 x 9.8)

H = 8.24m

b) Time taken by the ball :

T = 2v₀ sinθ/g

T = (2x 20 x 0.642)/9.8

T = 2.620 s

c) far form the edge of the building will it land:

range is calculated as :

R = v₀ sin2θ/g

R = (20 x 0.022)/9.8

R = 86.24m

a)A ball is thrown at an angle of 40 degrees, the ball reach the height  is 8.24m

b)Time taken by the ball in the air is 2.620 s.

c) far form the edge of the building will it land is 86.24m.

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a. The ring pushes on the rider with a force of 4.13 × 10^3 N at the top of the ride.

b. The ring pushes on the rider with a force of 5.81 × 10^3 N at the bottom of the ride.

c. The longest rotation period of the wheel that will prevent the riders from falling off at the top is 6.02 s.

A) At the top of the ride, the rider is in circular motion due to the normal force provided by the ring. The force of gravity acts downwards and the normal force acts upwards. The net force acting on the rider at the top is equal to the centripetal force required for circular motion.

The centripetal force is given by:

Fc = mv²/r

where m is the mass of the rider, v is the velocity of the rider in circular motion, and r is the radius of circular motion.

The velocity of the rider can be found from the period of rotation:

T = 2πr/v

v = 2πr/T

Substituting this expression for v into the expression for Fc, we get:

Fc = m(2πr/T)²/r = 4π²mr/T²

At the top of the ride, the normal force is equal to the centripetal force:

Fn = Fc = 4π²mr/T²

Substituting the given values, we get:

Fn = 4π²(59.0 kg)(9.81 m/s²)(9.00 m)/(4.40 s)² = 4.13 × 10³ N

B) At the bottom of the ride, the rider is still in circular motion due to the normal force provided by the ring. The force of gravity acts downwards and the normal force acts upwards. The net force acting on the rider at the bottom is equal to the sum of the centripetal force required for circular motion and the force of gravity:

Fnet = mv²/r + mg

where m is the mass of the rider, v is the velocity of the rider in circular motion, r is the radius of circular motion, and g is the acceleration due to gravity.

Using the same expressions for v and Fc as in part A, we can rewrite the above equation as:

Fnet = Fc + mg = 4π²mr/T² + mg

At the bottom of the ride, the normal force is equal to the net force:

Fn = Fnet = 4π²mr/T² + mg

Substituting the given values, we get:

Fn = 4π²(59.0 kg)(9.81 m/s²)(9.00 m)/(4.40 s)² + (59.0 kg)(9.81 m/s²) = 5.81 × 10³ N

C) The condition for the rider to not fall off at the top of the ride is that the centripetal force required for circular motion is greater than or equal to the force of gravity:

Fc ≥ mg

Substituting the expression for Fc from part A and solving for T, we get:

T ≤ 2π√(r/g)

Substituting the given values, we get:

T ≤ 2π√(9.00 m/9.81 m/s²) = 6.02 s

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The other pancakes are at various temperatures and Conduction refers to the mode of transfer of thermal energy that arise when the two bodies are in close contact.

The other pancakes are presumably at different temperatures in this scenario. If this is the case, then due to the thermal energy transfer, the pancake with the highest temperature should be the warmest at the bottom. Conduction is the process through which thermal energy is transferred when two bodies are in close proximity to one another.

Thermometers are used to measure the air's temperature. Common thermometers have a glass rod inside of which is a very thin tube. A liquid is delivered to the tube from a reservoir, or "bulb," at the thermometer's base. Sometimes the liquid is reddish alcohol, and other times it is mercury.

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The correct answer is A) Coal. Coal has the highest heating value per pound compared to oil and natural gas.

This is due to the fact that coal has a higher carbon content and burns more slowly and steadily than other fossil fuels. To further explain, coal is a black or brown rock-like substance that is composed primarily of carbon.

It is formed over millions of years from the remains of ancient plants that were buried and subjected to high pressure and heat. Coal is typically burned to produce electricity and heat, and it is a primary energy source for many countries around the world.

Oil and natural gas are also fossil fuels, but they have lower heating values per pound than coal. Oil is a liquid petroleum product that is refined from crude oil and is used primarily as a transportation fuel.

Natural gas is a colorless, odorless gas that is primarily composed of methane and is used for heating, cooking, and electricity generation. While these fossil fuels are also important sources of energy, coal has the highest heating value per pound.

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The two earth satellites are in parallel orbits of differing radii, so they will not always be 1 km apart. Therefore, the time it takes for them to be 1 km apart again will depend on their rate of revolution, which is determined by the time it takes for them to complete one orbit.

To answer Part A, we must calculate the orbital period of each satellite, which is calculated by dividing the circumference of the orbit by the speed of the satellite. Once we calculate the orbital period for each satellite, we can use this information to determine how long it will take for the two satellites to be 1 km apart again.

For Part B, we must calculate the thermal efficiency of the heat engine. This is done by dividing the amount of heat extracted from the hot reservoir (60 kJ) by the amount of heat exhausted (35 kJ). The thermal efficiency is the ratio of these two numbers, and can be expressed as a percentage.

Finally, we must calculate the work done per cycle, which is the difference between the heat extracted and the heat exhausted (60 kJ-35 kJ = 25 kJ). This amount can also be expressed to two significant figures, with the appropriate units.

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A heavy truck and a light car travel at the same velocity side-by-side on the highway. Both drivers apply the same braking force at the same moment Maintaining the minimum pressure of 90 psi in the system providies the necessary stopping power for the vehicle

Before driving a truck or bus with a dual air brake system, the pressure in the entire system should be at least 90 psi. The dual air brake system is a safety mechanism used in larger vehicles like trucks and buses. It consists of two separate air brake systems, each with its own air reservoirs, brake chambers, and control valves. This redundancy provides added safety in case one of the systems fails. To ensure effective braking, it is necessary to have a sufficient amount of compressed air in the system. The minimum required pressure for the entire dual air brake system is typically set at 90 psi (pounds per square inch). This pressure level is considered adequate to ensure reliable and responsive braking performance. Maintaining the minimum pressure of 90 psi in the system ensures that there is enough force to engage the brake chambers and apply the brakes effectively when needed. It allows for proper air distribution to the brakes and ensures that the braking system functions optimally, providing the necessary stopping power for the vehicle. Adhering to the minimum pressure requirement helps maintain the safety standards and operational reliability of the air brake system, which is crucial for the safe operation of trucks and buses on the road.

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The conversion in megayears, hours and seconds are :

\(1 \: para \: = \: 3.11 \times {10}^{8} \: megayears\)

\(1 \: para \: = \: 2.72 \times {10}^{18} \: hours\)

\(1 \: para \: = \: 9.81 \times {10}^{21} \: seconds\)

Given that :

1 para = 311040000000000 years

1 mega year = 1 million years :

311040000000000 years expressed in mega years will be :

Let : number of mega years = p

1 mega year = 1,000,000 years

p = 311040000000000 years

Cross multiply :

311040000000000 × 1 = 1,000,000 × p

311040000000000 = 1000000p

p = 311040000000000 / 1000000

p = 311040000 mega years

p = 3.1104 × 10^8 mega years

\(1 \: para \: = \: 3.11 \times {10}^{8} \: megayears\)

In hours :

In hours : 8760 hour = 1 year

Let : number of hours = p

1 year = 8760 hours

311040000000000 years = p

Cross multiply :

p = 8760 × 311040000000000

p = 2724710400000000000

p = 2.72 × 10^18 hours

\(1 \: para \: = \: 2.72 \times {10}^{18} \: hours\)

In seconds :

31536000 seconds = 1 year

Let : number of hours = p

1 year = 31536000 seconds

311040000000000 years = p

Cross multiply :

p = 31536000 × 311040000000000

p = 9808957440000000000000

p = 9.81 × 10^21 hours

\(1 \: para \: = \: 9.81 \times {10}^{21} \: seconds\)

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If the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.

The momentum of an object in motion is the product of mass and speed of the object.

P = mv

The principle of conservation of linear momentum states that, the sum of the initial momentum must be equal to the sum of the final momentum.

\(m_1v_1 = m_2 v_2\)

Thus, if the mass and post-collision speed of block 1 is known, the momentum of the block 2 can be determined.

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A moving object's momentum is calculated by multiplying its mass by its speed. P = mv, momentum in a line is conserved. According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

Thus, A team that is genuinely moving forward and gaining momentum will be challenging to stop.

According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

The definition of momentum is "mass in motion." Since every item has mass, if it is moving, it must have momentum because its mass is in motion.

Thus, A moving object's momentum is calculated by multiplying its mass by its speed. P = mv, momentum in a line is conserved. According to the conservation of linear momentum principle, the starting and final momentum must add up to the same amount.

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The fraction of the large moons of the planets orbit in the same direction as their planets rotate is that most fraction of the moons of the planets orbit in the same direction that their planets rotate.

Planets generally travelling in the either direction in their orbit. That has been considered as false. Planets has been formed by the large clouds of dust. The planets has been naturally wind-up spinning in the same direction as the dust cloud.

The bond between the planet and moon has been exceptional in many respects. In relation to its host planet, it has the solar system's biggest moon. Some people has been refer to the Earth and moon as a "binary planet system" because of how closely their sizes are related. The system has been referred to as a binary system since all that exists between a planet and its moon is that connection.

Therefore, The fraction of the large moons of the planets orbit in the same direction as their planets rotate is that most fraction of the moons of the planets orbit in the same direction that their planets rotate.

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According to the information we can infer that a combinational circuit processes inputs and produces outputs based solely on the current input values, while a sequential circuit also depends on its previous state.

Combinational circuits process inputs and produce outputs based solely on the current input values, without any memory or feedback mechanism. The output is determined by the combination of current inputs only.

Sequential circuits, on the other hand, have memory elements or feedback loops that allow them to retain information about their previous state. They consider both the current inputs and the internal state to generate outputs, as they have a concept of time and can store and recall information.

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It takes 0.1133 hours (or 6.8 minutes) for a total charge of 3.40 C to pass through a cross-sectional area of a copper wire that carries a current of 30 A.

Electric current is defined as the amount of charge that passes through a cross-sectional area in a given amount of time. This can be expressed mathematically as I = Q/t where I is the current, Q is the charge and t is the time.

Given that the current is 30 A and the charge is 3.40 C, we can rearrange the above formula to solve for time.

t = Q/I = 3.40 C / 30 A

= 0.1133 hours

Alternatively, we can convert hours to minutes, which gives: t = 0.1133 hours x 60 minutes/hour

= 6.8 minutes

The time it takes a total charge of 3.40 C to pass through a cross-sectional area of a copper wire that carries a current of 30 A is 0.1133 hours or 6.8 minutes. This calculation can help us to understand the relationship between current, charge and time, which is a fundamental concept in the study and application of electricity.

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Your image is located 25.0 cm behind the ball's front surface, following the sign conventions.

When dealing with sign conventions in optics, positive distances are measured in the direction of the light propagation, and negative distances are measured opposite to it. In this case, your face is 25.0 cm away from the ball's front surface, which is considered a positive distance.

Since the ball acts like a mirror, your image will appear at the same distance but in the opposite direction, making it a negative distance. Therefore, your image is located 25.0 cm behind the ball's front surface, following the sign conventions. This ensures that your image and face are equidistant from the ball's front surface, maintaining a symmetrical relationship in the optical setup.

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Taking into account the Boyle's law, the new pressure in the balloon is 120 000 Pa.

Boyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant.

Boyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Mathematically, this law says that if the amount of gas and the temperature remain constant, the product of pressure times volume always has the same value:

P×V= k

Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:

P1×V1=P2×V2

In this case, you know:

Replacing in the Boyle's law:

100 000 Pa×0.030 m² =P2×0.025 m²

Solving:

(100 000 Pa×0.030 m²) ÷0.025 m²= P2

120 000 Pa= P2

Finally, the new pressure in the balloon is 120 000 Pa.

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Answer:

   v = 72 km / h

Explanation:

The definition of average speed is the distance traveled between the time interval

          v = Δx / Δt

let's find the distance traveled

       x = 60 + 30

       x = 90 km

time spent, all time must be included, travel time and when stopped

       t = 0.45 + 0.15 + 0.5+ 0.15

       t = 1.25 h

we substitute in the initial equation

      v = 90 / 1.25

       v = 72 km / h

in going from one city to the other

The type of radioactive decay that has a positive charge is alpha particles, which are positively charged.

The expression radioactive decay makes reference to the emission of ionizing radiation for a given atom, thereby an unstable atom may lose energy by releasing radiation.

Alpha particles are specific atomic particles consisting of 2 protons  (positive charge) and also 2 neutrons that share chemical bonds.

In conclusion, the type of radioactive decay that has a positive charge is alpha particles, which are positively charged.

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