measurement of the speed of sound using the flash and report method

Answer:the mass of the water in the bowl when it is placed in the freezer is 0.5 kg.

Explanation:To calculate the mass of the water in the bowl when it is placed in the freezer, we can use the formula:

mass = volume × density

The volume of the water is given as 500 cm³. To convert this to m³, we can use the conversion factor:

1 m³ = 1,000,000 cm³

So, the volume in m³ is:

500 cm³ × (1 m³ / 1,000,000 cm³) = 0.0005 m³

The density of water is given as 1000 kg/m³. Now we can calculate the mass:

mass = 0.0005 m³ × 1000 kg/m³ = 0.5 kg

If the string snaps while a boy is swinging a ball attached to it in a horizontal circle, the ball will move tangentially away from the circle. This is because of the tendency of an object in motion to continue moving in a straight line, according to Newton's first law of motion.

At the moment when the string snaps, the ball is moving at a tangent to the circle, and it will continue to move in that direction due to its inertia. This means that the ball will no longer be moving in a circular path, but rather in a straight line.

The direction and speed of the ball after the string snaps will depend on the exact moment at which the string breaks and the velocity of the ball at that moment. If the boy is swinging the ball with a lot of force, the ball may travel quite far before it comes to a stop. On the other hand, if the boy is swinging the ball with less force, the ball may not travel very far at all before coming to a stop.

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The responses obtained using the principle of moments are;

(a) Please find attached the drawing of the forces acting on the plank created with MS Word

(b) 720 N·m

(c) 180 N

(d) 600 N

(e) 420 N

(f) 0

(g) 0.5 meters from A

The principle of moments is a fundamental physics principle that is used to explain how objects in equilibrium. The principle states that at equilibrium; The total clockwise moments = The total anticlockwise moment.

(a) Please find attached the drawing showing the weights acting on the plank, created with MS Word

(b) The total clockwise moments of the two weights about A is calculated as follows:

- The moment of the weight of the plank about A is 120 N × 3 m = 240 N·m

- The moment of the weight of the man about A is 480 N × 1 m = 480 N·m

- The total clockwise moment of the two weights about A is 240 N·m + 480 N·m = 720 N·m

(c) The anticlockwise moment about A is; Upward force from trestle B × 4 m

The principle of moments indicates;

∑(Clockwise moment) = ∑(Anticlockwise moment)

Therefore; 720 N·m = Upward force from trestle B × 4 m

Upward force from trestle B = 720 N·m/(4 m) = 180 N

The upward force at trestle B is 180 N

(d) The total downward force on the trestles is; 120 N + 480 N = 600 N

(e) The principle of equilibrium indicates that we get;

The sum of upward forces = The sum of downward forces, therefore;

180 N + The upward force at trestle A = 600 N

The upward force at trestle A = 600 N - 180 N = 420 N

(f) When the man walks past A to the left-hand end of the plank, we get;

The plank starts to be lifted upwards from trestle B such that the upward force from trestle B becomes 0

(g) When the plank tips, we get;

480 × x = 120 × 2

x = 120 × 2/480 = 0.5

The man is 0.5 m from the trestle A as the plank tips.

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The force exerted by the racket on the south end on the ball is 1.2 N.

Mass of the ball , m = 0.1 kg, velocity of the ball, v₁ = 65 km/h = 18.06 m/s. Distance travelled by the ball, S = 23.78.

S = v₁t + 1/2at²

23.78 = 18.06t + 5t²

t = 1.7 s

F = ΔP

F = mv₂ /t, F = 0.1 x 20.83/1.7 and F = 1.2 N.

A push or a pull that an object experiences as a result of interacting with another item is known as a force. some forces are the result of contact interactions (normal, frictional, tensional, and applied forces are examples of contact forces), whilst other forces (gravitational, electrical, and magnetic forces) are the consequence of action-at-a-distance interactions.

Thus, The force exerted by the racket on the south end on the ball is 1.2 N.

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After turning out the light for the night, your head hits the pillow. gradually, your muscles relax and drowsiness occurs. This drowsy yet wakeful state is associated with brain waves: Alpha. The correct option is A.

When turning out the light for the night, your head hitting the pillow signals the body to relax. Muscles loosen and drowsiness begins to set in, creating a state between wakefulness and sleep. This drowsy yet wakeful state is associated with brain waves, specifically alpha.

Alpha waves occur during a relaxed, awake state and are present when the eyes are closed. Beta waves appear during alertness and active thinking. Theta waves are associated with the beginning stages of sleep, but can also be present when an individual is in a relaxed, meditative state. Lastly, delta waves are the slowest brain waves and are only present during deep sleep.

In conclusion, when turning out the light for the night and your head hitting the pillow, your muscles relax and drowsiness occurs. This drowsy yet wakeful state is associated with brain waves, specifically alpha, beta, theta, and delta waves. These waves are categorized by their different frequencies and are associated with different states of consciousness.

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Answer:

p1:10 and v1:100

meaning p2 :20 andv2 :200

=200

A scalar quantity is a quantity that just has magnitude and no direction. Scalars include things like length, mass, speed. But a physical quantity is referred to as a vector quantity if it includes both magnitude and direction.

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Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.

We can use Newton's second law, which states that force equals mass times acceleration. In this case, the mass of the boulder is not given, so we cannot directly calculate the force. However, we know that weight is equal to mass times the acceleration due to gravity (9.8 m/s^2), so we can use this relationship to determine the mass of the boulder.

[tex]2200 N = m * 9.8 m/s^2\\\Solving for mass, we get:\\\m = 224.5 kg[/tex]

We can use Newton's second law to find the horizontal force:

[tex]F = m * a = 224.5 kg * 13.0 m/s^{2 }= 2918.5 N[/tex]

Therefore, Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.

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The two correct responses that describe a characteristic shared by sunspots, solar flares, and coronal mass ejections are as follows:

They all are connected to the magnetic activity of the Sun.

They are all associated with the Sun's corona and solar atmosphere.

What are sunspots, solar flares, and coronal mass ejections?

Sunspots are dark areas on the surface of the sun. They have a cooler temperature than the surrounding area because they are regions where the magnetic fields prevent hot, plasma-carrying gases from moving in and out of the sun.

Solar flares are sudden, violent eruptions of energy on the sun's surface that release huge amounts of energy. They are also associated with the magnetic activity of the sun.

Coronal mass ejections (CMEs) are huge eruptions of plasma and magnetic fields from the sun's corona. They can have significant impacts on Earth's magnetosphere, and hence, on electrical power grids, satellite communications, and even GPS systems.

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The mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision is three times the mass of the Earth.

When an asteroid collides with Earth, the day may become longer or shorter. The asteroid can cause Earth's rotation to slow down, leading to longer days or it may increase Earth's rotation speed, leading to shorter days. To find the mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision, we can use the law of conservation of angular momentum. Angular momentum is the product of mass, velocity, and radius of the rotating object.

According to the law of conservation of angular momentum, the angular momentum of an object is conserved if there is no net external torque acting on it before and after a collision or any other event.

Mathematically, angular momentum is given as:

L = mvr

Where L = angular momentum, m = mass, v = velocity, r = radius of rotation. As the asteroid is very small compared to the Earth, we can assume that the Earth's mass remains constant before and after the collision. Therefore, the angular momentum of the Earth before and after the collision must be the same. Hence, we have:

L initial = L final

m asteroid x v asteroid x r asteroid = (m earth ) x (v earth ) x (r earth )

The speed of rotation of the Earth and the radius of rotation remains constant. Thus, we can substitute

v earth x r earth = constant in the above equation.

m asteroid x v asteroid = (m earth ) x constant x 1.2 {20% increase in length of day = 1.2}

m asteroid/m earth = 1.2/0.4

m asteroid/m earth = 3

The mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision is three times the mass of the Earth.

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To determine the rate at which cooling water must pass over the coil, we need to find the power of the electromagnet and then use the specific heat capacity of water to calculate the required mass flow rate.

Explanation:

Step 1: Calculate the power of the electromagnet.
Power = Voltage x Current
Power = 240 V x 17.5 A = 4200 W

Step 2: Determine the specific heat capacity of water.
The specific heat capacity of water is approximately 4.18 J/(g ·K).

Step 3: Calculate the required mass flow rate.
Power = mass_ flow_ rate x specific_ heat_ capacity x temperature_ rise
4200 W = mass_ flow_ rate x 4.18 J/(g ·K) x 6.5 K

Rearrange the formula to find the mass flow rate:
mass_ flow_ rate = 4200 W / (4.18 J/(g· K) x 6.5 K)
mass_ flow_ rate = 4200 W / (27.17 J/g) = 154.54 g/s

So, the cooling water must pass over the coil at a rate of 154.54 g/s to keep the water temperature rise no more than 6.5 K.

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True. In order to develop patterns, the study of physical phenomena is considered to be a part of physics.

The field of research known as physics studies the interactions between the underlying elements of the cosmos and the structure of matter. Quantum mechanics is used to study very small objects, and general relativity is used to study everything in the universe.

The study of celestial objects and space in general—basically, everything outside of Earth's atmosphere—is known as astronomy.

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The astronaut gains a velocity of 4 m/s to the left.

What is Velocity?

The unit of velocity is meters per second (m/s) in the International System of Units (SI). Velocity can be positive or negative, depending on the direction of motion. A positive velocity means the object is moving in the positive direction, while a negative velocity means it is moving in the opposite direction.

According to the law of conservation of momentum, the total momentum of the system before the collision is equal to the total momentum after the collision, provided there are no external forces acting on the system.

Let's assume that the astronaut and the rock are initially at rest, so the total momentum before the collision is zero. After the rock is thrown to the right, the momentum of the system is:

P = m1 * v1 + m2 * v2

where m1 and v1 are the mass and velocity of the astronaut, m2 and v2 are the mass and velocity of the rock, and P is the total momentum.

Substituting the values given, we get:

P = 100 kg * v1 + 200 kg * 2 m/s

P = 100 kg * v1 + 400 kg*m/s

Since the total momentum of the system must be conserved, the total momentum after the collision must also be zero. Therefore:

P' = m1 * v1' + m2 * v2' = 0

where v1' and v2' are the final velocities of the astronaut and the rock, respectively.

We know that the rock gains a velocity of 2 m/s to the right, so its final velocity is v2' = 2 m/s. Substituting this into the above equation, we get:

100 kg * v1' + 200 kg * 2 m/s = 0

Solving for v1', we get:

v1' = -4 m/s

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The force exerted on the car when motorist is pulling on the midpoint of the 3.0-m rope is 400 N.

The question involves the determination of the force exerted on the car when one end of a 3.0-m rope is tied to a tree; the other end is tied to a car stuck in the mud.

The motorist pulls sideways on the midpoint of the rope, displacing it a distance of 0.25 m. If he exerts a force of 200.0 N. Under these conditions, the force exerted on the car can be calculated as follows;

Since the displacement of the rope is perpendicular to the direction of the applied force, the component of the force perpendicular to the rope's direction must be considered. We can calculate the force perpendicular to the direction of the applied force as follows;

F_perpendicular = F x sinθ

where, F is the force exerted, and θ is the angle between the force and the direction of the rope (90°).

Therefore,

F_perpendicular = 200 x sin(90°) = 200 x 1 = 200 N

The force acting on the car is the force in the direction of the rope, which is equal to two times the force perpendicular to the rope direction. Therefore,

F_car = 2 x F_perpendicular

F_car = 2 x 200 N = 400 N

Therefore, the force exerted on the car is 400 N.

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The magnitude of F black-red compared to F red-black  5 times greater.

The force exerted between two charged objects is given by Coulomb's law:

F = k * (q1 * q2) / r^2

Let's denote the charge on the red balloon as q_red and the charge on the black balloon as q_black. Since the black balloon has 5 times the charge of the red balloon, we can write:

q_black = 5 * q_red

Now let's consider the force exerted by the black balloon on the red balloon. According to Coulomb's law, this force is given by:

F_black-red = k * (q_black * q_red) / r^2

Substituting q_black = 5 * q_red, we get:

F_black-red = k * (5 * q_red * q_red) / r^2

Simplifying this expression, we get:

F_black-red = 5 * (k * q_red^2) / r^2

Similarly, the force exerted by the red balloon on the black balloon is given by:

F_red-black = k * (q_red * q_black) / r^2

Substituting q_black = 5 * q_red, we get:

F_red-black = k * (q_red * 5 * q_red) / r^2

Simplifying this expression, we get:

F_red-black = 5 * (k * q_red^2) / r^2

Comparing the two expressions, we can see that:

F_black-red = 5 * F_red-black

Therefore, the magnitude of the force exerted by the black balloon on the red balloon is 5 times greater than the magnitude of the force exerted by the red balloon on the black balloon.

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The strength of an electric field that will balance the weight of a proton is 1.6 x 10^-18 N/C.

The strength of an electric field that will balance the weight of a proton is given by the Coulomb force formula which is F=Eq. Therefore, the electric field strength that balances the weight of a proton is given by:

E=qg

where E is the electric field strength, q is the charge of the proton, and g is the acceleration due to gravity.

Electric field strength (E) = qg

From the Coulomb's law, we know that, q = e = 1.60 x 10^-19 C

Also, the weight of the proton (F) is given by:

F = mg

where m is the mass of the proton and g is the acceleration due to gravity.

Therefore, the value of g is 9.81 m/s^2

Therefore,

F = m * g = (1.67 x 10^-27 kg) * (9.81 m/s^2) = 1.64 x 10^-26 N

Therefore, the electric field strength that balances the weight of a proton is:

E=qg = (1.60 x 10^-19 C) * (9.81 m/s^2) = 1.57 x 10^-18 N/C

Approximately, the electric field strength is 1.6 x 10^-18 N/C

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The stationary electron placed in a uniform electric field pointing along the x axis will be forced to move in the direction opposite to that of the field, which is along the x axis. To be more specific, the electron will be forced to move along the positive y-axis.

An electric field is defined as the force that is experienced by a charged particle when it is placed in an electric field. It is represented by an electric field line that points in the direction of the electric field's intensity. An electric field is usually created by a charged particle or an electric charge.

Electric field intensity is a vector quantity that represents the strength of the electric field at any given point in space. The electric field is represented by E, and the electric field intensity is represented by E. The electric field is usually directed from the positive charge to the negative charge.

When a stationary electron is placed in an electric field, it will move in the direction opposite to that of the electric field. Therefore, if a uniform electric field is directed along the x-axis and a stationary electron is placed in this field, it will start to move in the direction opposite to that of the electric field or along the y-axis.

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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 angular acceleration of the person's arm about the shoulder is the greatest when the arm is at its lowest point during the swing, perpendicular to the ground.

The angular acceleration of the arm about the shoulder will be the greatest when the arm is at its lowest point during the swing, which is perpendicular to the ground.

1. The person's arm starts in an initial position that is straight out and parallel to the ground.
2. As the person allows her arm to swing freely, gravitational force causes the arm to accelerate downward.
3. The force acting on the arm is the weight of the arm, which can be considered to act at its center of mass.
4. As the arm moves downward, the torque (rotational force) about the shoulder joint increases due to the increased force of gravity acting on the arm.
5. The angular acceleration is directly proportional to the torque and inversely proportional to the moment of inertia.

In this case, the moment of inertia remains constant as the arm's mass and length remain the same throughout the swing.
6. Therefore, the angular acceleration of the arm will be the greatest when the torque about the shoulder is the largest.
7. The torque will be the largest when the arm is at its lowest point during the swing, which is when it is perpendicular to the ground.

This is because the force of gravity acting on the arm has the most significant impact at this position.

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Answer:

7 Ω

Explanation:

Given:

R1 = 21 Ω

The connection is parallel

Since all 3 of the resistors have the same resistance, we can use this formula to find the total resistance of the circuit:

R = R1/n (R1 is the resistance of one resistor and n is the number of resistors)

R = 21/3 = 7 Ω

Answer:

understand Newton's second law of motion,F is equal to ma where F is the force ,m is the mass of the object,a is acceleration

At room temperature in a vacuum, the speeds of gases are typically 1.4 km/s and vary with the inverse square of the molecular weight.

The Kinetic Theory of Gases describes the conduct of gases. It explains that the behavior of gases can be explained in terms of the movement of their particles. Gases are composed of a vast number of small particles (molecules) that are continually moving in random directions at high speeds. These particles collide with each other and with the walls of their container. The Kinetic Theory of Gases is concerned with the properties of gases in their motion states at temperatures at which the intermolecular forces are insignificant.

The relationship between gas temperature and molecular speed is due to the fact that the thermal motion of a particle is directly proportional to its temperature. Because gases have a lot of thermal energy and the kinetic energy of particles is proportional to temperature, gas particles travel very quickly. The speed of gas particles is faster than the speed of particles in liquids and solids because the latter is closer together and interact with each other more frequently.

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The center of mass of the system is located 1.75 centimeters to the right of the origin.

The center of mass of the system can be found using the formula:

x_cm = (m1x1 + m2x2) / (m1 + m2)

Where x_cm is the center of mass, m1, and m2 are the masses of the two-point masses, and x1 and x2 are their respective positions.

Substituting the values given, we get:

x_cm = (1 gram * -5 cm + 3 grams * 7 cm) / (1 gram + 3 grams)

x_cm = (3 grams * 2 cm) / 4 grams

x_cm = 1.5 cm

Therefore, the center of mass of the system is located 1.5 centimeters to the right of the origin.

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An astronaut would need a linear speed of 30.6 m/s to be spinning in order to experience an acceleration of 3 g's at a radius of 10.0 m.

The linear speed of an astronaut in a centrifuge in order to experience an acceleration of 3 g’s at a radius of 10.0 m can be calculated using the following equation:

Linear Speed = (Centrifugal Acceleration * Radius)/9.81

Therefore, the linear speed of the astronaut in the centrifuge will be:

Linear Speed = (3 * 10.0 m)/9.81
Linear Speed = 30.6 m/s

This means that an astronaut needs to be spinning at a linear speed of 30.6 m/s in a centrifuge in order to experience an acceleration of 3 g’s at a radius of 10.0 m. This is a physical test that astronauts need to undergo before they are allowed to fly in space.

The centrifuge is designed to simulate the gravitational effects on the body that astronauts experience during a space mission. This is done by spinning the astronaut around a fixed point and applying the centripetal force on them, which is calculated using the equation:

Centripetal Force = Mass * Linear Speed^2/Radius

This force provides an artificial gravitational pull on the astronaut and helps them get used to the acceleration effects they will experience in space. The greater the linear speed and radius, the greater the centrifugal force, and hence the greater the acceleration experienced by the astronaut.

It is important that astronauts get used to the acceleration experienced in space as they will be required to work in the space environment and need to be physically prepared. The centrifuge allows astronauts to become acclimatized to the effects of high acceleration and helps them perform better in space.

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Answer:

the student should use the same type and size of iron core for each current level tested

Explanation:

To make the investigation a fair test, the student would need to control for variables that could affect the strength of the electromagnet other than the size of the current flowing through it. Two important potential variables to control are:

The number of turns in the coil: The number of turns in the coil can affect the strength of the electromagnet. More turns in the coil can increase the strength of the electromagnet, and fewer turns can decrease it. Therefore, the student should use the same number of turns in the coil for each current level tested.

The type and size of the iron core: The type and size of the iron core can also affect the strength of the electromagnet. A larger or different type of iron core can increase or decrease the strength of the electromagnet, respectively. Therefore, the student should use the same type and size of iron core for each current level tested

Jamie should use Lead as the substance to increase the gravitational force between the balloon and golf ball the most.

The gravitational force between two objects is influenced by their masses and the separation between them. The gravitational force is calculated using the formula F = G × (m1 × m2) / r², where F is the gravitational force, G is the gravitational constant, m1, and m2 are the objects' masses, and r is the separation between them. Jamie has to either reduce the distance between the items or raise their masses in order to enhance the gravitational pull between the balloon and the golf ball.

The only way to increase the gravitational force since the separation is fixed at 10 meters is to increase the masses of the objects. As a result, Jamie ought to inflate the balloon with something heavy. Jamie may increase the balloon's mass and, as a result, the gravitational pull between the balloon and the golf ball by filling the balloon with lead.

Hence, Jamie should use Lead as the substance to increase the gravitational force between the balloon and golf ball the most.

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The expansion of a 13L steel scuba tank can be ignored when evaluating the mass of air inside because the volume increase due to expansion is very small compared to the tank's original volume. It is a good approximation.

The expansion of a 13L steel scuba tank occurs due to changes in temperature and pressure. When the tank is filled with air, the air inside the tank is also affected by these changes. However, the volume increase due to expansion is typically very small compared to the original volume of the tank. As a result, the mass of air inside the tank can be evaluated without taking into account the expansion of the tank. This is a good approximation because the expansion is negligible in comparison to the total volume of the tank. However, it's worth noting that if a more precise calculation is required, the expansion of the tank should be taken into account.

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Answer:A Voltmeter has very high resistance to ensure that it's connection do not alter flow of current in the circuit. Now if it is connected in series then no current will be there in the circuit due to it's high resistance. Hence it is connected in parallel to the load across which potential difference is to be measured.

Explanation:

In engineering mechanics, the force component that acts tangent to, or along the face of, a section is called the shear force.

In engineering mechanics, the shear force is the component of a force that acts tangent to, or along the face of, a section. It is a type of force that arises when two parts of a material or structure are moved in opposite directions, causing the material to deform or break. Shear forces are commonly encountered in the design and analysis of structures, such as bridges and buildings. Engineers need to understand and account for shear forces in their designs to ensure that the structures can withstand the forces they will be subjected to during use. In general, shear forces can be thought of as a type of sliding force, acting parallel to the face of a section.

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The following would cause the light bulb to glow : c) Moving the magnet through coil of wire.

When magnet moves through a coil of wire, it creates changing magnetic field that induces electric current in the wire. This current flows through light bulb, causing it to light up.

Bulbs work by sending electricity through curly tungsten filament. The long, twisting path increases electrical resistance faced by traveling electrons, heating filament to some 3000 K. At that temperature, filament glows with  warm yellowish white light.

LED bulb as compared to halogen lamps or incandescent bulbs, has much higher resistance on count of integrated power supply unit. The serial connection of glow lamp clamps the circuit even when the switch is turned off.

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