the energy of moving things are called​

The magneto-electric effect causes both a magnetic and an electric field to exist, which is the right response to the question.

The area in which the force of magnetism acts around a magnetic material or a moving electric charge is known as the magnetic field.

If the Earth's magnetic field is perpendicular to the ground at your location, it means that the magnetic field lines are vertical and pointing downwards (or upwards) into the Earth. Since the electric field is zero, we can conclude that there is no electric current or charge in the vicinity.

If you run through this field, you will experience a magnetic field. This is because your motion through the magnetic field induces an electric field according to Faraday's law of electromagnetic induction. The induced electric field is perpendicular to both the magnetic field and your direction of motion, and it generates a magnetic field that is perpendicular to both the electric and magnetic fields. This phenomenon is known as magneto-electric effect or electromagnetic induction.

Therefore, the correct answer to the question is: you will find both a magnetic and an electric field due to the magneto-electric effect.

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Answer:

r = 0.2499 m

Explanation:

Use Coulomb's Law: \(F_{e} = kq_{1}q_{2} / r^{2}\) where Fe is the electric force, q1 and q2 are the 2 charges respectively, k is a constant (8.99*10^9 N • m^2 / C^2) and r is the distance.

\(3.6 N = (8.99*10^{9})(5*10^{-6})(5*10^{-6}) / r^{2}\)

r = 0.2499 m

The distance that should be apart from these charges should be considered when the r = 0.2499 m.

Since

Two charges of 5 x 10-6 C are a certain distance apart. These two positive charges experience 3.6 N of repelling electrical force between them

So

here we use Columb law

Electric force = k * two charges * two charges)r^2

3.6 N = (8.99*10^9) * ( 5 * 10^-6) * (5*10^-6)r^2

r = 0.2499 m.

Hence, The distance that should be apart from these charges should be considered when the r = 0.2499 m.

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Answer:thx

Explanation:

A 27 kg child is sliding down a 35-degree inclined slide. The coefficient of kinetic friction between the child's pants and the slide is 0.25. The infant is subject to a friction force of roughly 55.58 Newtons.

To find the magnitude of the friction force acting on the child, we need to consider the gravitational force and the normal force acting on the child.

1. Gravitational force:

The gravitational force acting on the child can be calculated using the formula: \(F_{\text{gravity}} = m \cdot g\) = m * g, where m is the mass of the child and g is the acceleration due to gravity (approximately 9.8 m/s²).

\(F_{\text{gravity}}\) = 27 kg * 9.8 m/s² = 264.6 N

2. Normal force:

The normal force is the force exerted by a surface to support the weight of an object resting on it. In this case, the normal force acts perpendicular to the inclined slide. It can be calculated using the formula: \(F_{\text{normal}}\)= m * g * cosФ, where theta is the angle of inclination.

\(F_{\text{normal}}\)= 27 kg * 9.8 m/s² * cos(35 degrees) = 222.3 N

3. Friction force:

The friction force can be calculated using the formula: \(F_{\text{friction}}\) = coefficient of kinetic friction * \(F_{\text{normal}}\).

\(F_{\text{friction}}\) = 0.25 * 222.3 N = 55.58 N

Therefore, the magnitude of the friction force acting on the child is approximately 55.58 Newtons.

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Answer:

Explanation:

Newton's Third Law states that "every action has an equal and opposite reaction". In a rocket, burning fuel creates a push on the front of the rocket pushing it forward. This creates an equal and opposite push on the exhaust gas backwards.

Answer:

Aristotle was blind, therefore could not see change in positions. Aristotle could see no detectable change in the positions of the stars, thought Earth was immovable.

Explanation:

Answer:

Explanation:

4375J

The temperature T of the lump of metal after t minutes, assuming it obeys Newton's Law of Cooling, can be expressed as T = -30kt + 30. However, the value of the cooling constant k is not provided, so it is not possible to determine the exact temperature without additional information.

Newton's Law of Cooling states that the rate of change of temperature of an object is directly proportional to the temperature difference between the object and its surroundings. Mathematically, this can be expressed as:

dT/dt = -k(T - Ts)

where dT/dt is the rate of change of temperature with respect to time, T is the temperature of the object, Ts is the temperature of the surroundings, and k is the cooling constant.

In this case, we can use the given data to find the value of k. After 10 minutes, the temperature of the lead block was 60oF, and the temperature of the surroundings was held constant at 80oF. Plugging these values into the equation, we have:

dT/dt = -k(60 - 80)

Simplifying the equation, we get:

-30k = dT/dt

Integrating both sides, we have:

∫-30k dt = ∫ dT

-30kt + C1 = T

Since the initial temperature of the lead block was 30oF, we can substitute t = 0 and T = 30 into the equation:

-30k(0) + C1 = 30

C1 = 30

Therefore, the equation for the temperature of the lump after t minutes is:

T = -30kt + 30

To determine the temperature T after a specific time t, we need to know the value of k.

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The ratio of the speeds of sound in the two liquids (Va/Vb) is 2√2.

The speed of sound in a medium is determined by the square root of the ratio of the bulk modulus (K) to the density (ρ) of the medium.

The ratio of the speeds of sound in the two liquids (Va/Vb) can be calculated using the given information:

Va/Vb = √(Ka/Kb * ρb/ρa)

Given that the bulk modulus of liquid A (Ka) is twice that of liquid B (Kb), and the density of liquid A (ρa) is one half of the density of liquid B (ρb), we can substitute these values into the equation:

Va/Vb = √(2 * ρb / (1/2 * ρa))

Simplifying further:

Va/Vb = √(4 * ρb / ρa)

Since the ratio of the densities is ρb/ρa = 2, we have:

Va/Vb = √(4 * 2) = √8 = 2√2

Therefore, the ratio of the speeds of sound in the two liquids (Va/Vb) is 2√2.

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a. Kinetic Energy = 49j

b.  Potential Energy= 147 j

c. Mechanical Energy = 196 j

Kinetic energy of an object is the energy that it possesses due to its motion which is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

a. Kinetic Energy = 1/2 * m * v^2,

KE = 1/2 * 3kg * (7m/s)^2 = 49 J.

b. Potential Energy  = m * g * h,

PE = 3kg * 9.8 m/s^2 * 5m = 147 J.

c. Mechanical Energy  = KE + PE,

ME = 49 J + 147 J = 196 J.

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Taking into account the definition of kinetic, potencial and mechanical energy, if a 3kg ball 5m in the air is moving at 7m/s, the kinetic energy is 73.5 J, the potential energy is 147.15 J and the mechanical energy is 220.65 J.

Kinetic energy is the energy possessed by a body or system due to its movement.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. Once the final speed is reached, the amount of kinetic energy accumulated will remain constant, that is, it will not vary, unless another force acts on the body again.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

Where:

Gravitational Potential Energy is the energy that an object possesses due to its position in a gravitational field and represents the potential that an object has to do work as a result of being located in a particular position within that gravitational field.

For an object with mass m, at height h, the expression applied to the gravitational energy of the object is:

Ep= m×g×h

Where:

Mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. This is:

Potential energy + kinetic energy = total mechanical energy

The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)

In this case, you know:

Replacing the definition of kinetic energy:

Ec = 1/2×3 kg× (7 m/s)²

Solving:

Ec= 73.5 J

The kinetic energy is 73.5 J.

You know:

Replacing in the definition of potential energy:

Ep= 3 kg× 9.81 m/s²× 5 m

Solving:

Ep= 147.15 J

The potential energy is 147.15 J.

Being:

the mechanical energy can be calculated as:

Potential energy + kinetic energy = total mechanical energy

147.15 J + 73.5 J = total mechanical energy

Solving:

220.65 J = total mechanical energy

The mechanical energy is 220.65 J.

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The amount of magnetic energy he amount of magnetic energy stored in a solenoid depends on  in a solenoid depends on its dimensions and the strength of the magnetic field within it.

To calculate it, we need additional information such as the number of turns in the solenoid, the current flowing through it, and its inductance. Without these details, it's not possible to provide an exact value. However, the magnetic energy in a solenoid is generally given by the formula: U = (1/2) * L * I^2, where U is the magnetic energy, L is the inductance, and I is the current.

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The estimated momentum of a tennis ball served by a professional tennis player is about 2.9 kg m/s.

The momentum of a tennis ball served by a professional tennis player can be estimated using the following formula:

p = m*v

where p is the momentum, m is the mass of the ball, and v is the velocity of the ball.

According to the International Tennis Federation, the regulation weight of a tennis ball is between 56 and 59.4 grams, and the regulation diameter is between 6.54 and 6.86 centimeters.

The velocity of a professional tennis serve can vary widely, but it can be over 200 km/h (55.5 m/s). Let's assume that the tennis ball has a mass of 58 grams (the average of the regulation range) and a velocity of 50 m/s (which is slightly lower than the lower end of the typical range).

Then, the momentum of the tennis ball can be calculated as:

p = mv = (0.058 kg)(50 m/s) = 2.9 kg m/s

Therefore, the estimated momentum of a tennis ball served by a professional tennis player is about 2.9 kg m/s.

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Full Question: Estimate the momentum p of a tennis ball served by a professional tennis player. image attched

Explanation:

Metallic bonds hold metal atoms and freely moving valence electrons together, while Van der Waals forces hold nonpolar molecules together. OD. Metallic bonds hold metal atoms and freely moving valence electrons together while Van der Waals forces hold atoms together when they share valence electrons.

Answer:

b) Quartz Clock

Explanation:

It's is a very type of clock which uses the vibration of quartz crystals to measure time accurately

A scientific theory has been tested many times, and been shown to be accurate. The correct option is B.

A hypothesis is a testable declaration about the relationship among two or more factors or a suggested clarification for some observational method in a scientific context.

A hypothesis is developed in scientific methodology before any relevant research is conducted. In contrast, a theory is backed by evidence.

In contrast, a theory is a sensible explanation of a phenomenon that can be proffered as a scientific study. A scientific theory has been tested numerous times and proven to be correct.

Thus, the correct option is B.

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The final velocity of the boy/boat system is 1.43 m/s forward. The correct answer is 1.43 m/s forward.

The final velocity of the boy/boat system can be determined using the principle of conservation of momentum. Momentum is defined as the product of an object's mass and velocity. According to the conservation of momentum, the total momentum before the jump is equal to the total momentum after the jump.

Given:
Mass of the boy (m1) = 50 kg
Initial velocity of the boy (v1) = 5 m/s
Mass of the boat (m2) = 125 kg
Initial velocity of the boat (v2) = 0 m/s

Step 1: Calculate the initial momentum of the boy and the boat separately.
Initial momentum of the boy (p1) = m1 * v1
Initial momentum of the boat (p2) = m2 * v2
Since the boat is stationary, its initial momentum is zero.

Step 2: Calculate the total initial momentum of the system.
Total initial momentum (p_initial) = p1 + p2

Step 3: Calculate the final momentum of the system.
Final momentum of the system (p_final) = total initial momentum (p_initial)

Step 4: Use the final momentum to calculate the final velocity of the system.
Final velocity of the system (v_final) = p_final / (m1 + m2)

Substitute the given values into the equation:
v_final = p_final / (m1 + m2)

v_final = (p1 + p2) / (m1 + m2)

v_final = (m1 * v1 + m2 * v2) / (m1 + m2)

Substitute the values:
v_final = (50 kg * 5 m/s + 125 kg * 0 m/s) / (50 kg + 125 kg)

v_final = (250 kg·m/s + 0 kg·m/s) / (175 kg)

v_final = 250 kg·m/s / 175 kg

v_final = 1.43 m/s

So, the final velocity of the boy/boat system is 1.43 m/s forward.

Therefore, the correct answer is "1.43 m/s, forward."

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The first stage in the evolution of stars is the protostellar phase. It lasts roughly 500,000 years for a low-mass star (sun-mass or less).

When a star is still gaining mass from its parent molecular cloud, it is referred to as a protostar. The first stage in the evolution of stars is the protostellar phase. It lasts roughly 500,000 years for a low-mass star (sun-mass or less). A molecular cloud fragment first experiences self-gravity-induced collapse before entering the phase, where an opaque, pressure-supported core develops inside the fragment. It comes to an end when the gas that is descending outruns it, leaving a pre-main-sequence star that subsequently contracts to become a main-sequence star at the start of hydrogen fusion that produces helium. Since the protostar is still contracting, its diameter and surface area are extremely large, and its luminosity may be approximately 100 times greater than when it is fully formed.

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The correct answer is frame of reference

Motion is a simple idea to grasp, but depending on the degree of detail required, it might turn out to be a fairly difficult item to calculate. Motion may be defined simply as the measurement of movement in a certain direction. Several forces, including mass, friction, velocity, and distance, must be understood in order to determine movement and direction.

An item must move in order to measure motion. Starting from one position in space and terminating at another is what is meant by this definition. Though time is not required to show motion, it is sometimes added to the calculation of speed to account for the time needed to go from one location to another. In theoretical mathematics, movement is typically represented as an x-y cartesian graph.

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The component of the force acting in the direction of an object's motion determines how much force is doing work on that object. The "parallel component" of the force is referred to as this.

A force that is applied perpendicular to an object's motion has no effect since it does not add to the object's kinetic energy.

It follows that the force exerted on the item will increase if the applied force's direction is adjusted to make it more parallel to the direction of motion.

The amount of force accomplishing work will decrease, on the other hand, if the direction of the applied force becomes increasingly perpendicular to the direction of motion.

Take the movement of a box across a rough surface as an illustration.

Only a fraction of the force will be parallel to the surface of the force delivered at a 45-degree angle to the surface, contributing to the motion of the box.

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To determine the mass of granite, we must first understand the definition of density. Density is defined as the amount of matter present in a substance per unit volume.

We use the formula: density = mass/volume to calculate the mass of a substance given its density and volume. To calculate the mass of 54.3 m³ of granite, we use the following steps:

Given Density of granite = 2700 kg/m³Given volume of granite = 54.3 m³Let us substitute the values in the formula of density:density = mass/volume Solving for mass, we get:mass = density × volume Substitute the given values of density and volume into the formula:mass = 2700 kg/m³ × 54.3 m³

The m³ unit in the volume cancels out, leaving us with kg as the unit for mass.

We then solve the equation to get the mass:mass = 146,610 kg

Therefore, the mass of 54.3 m³ of granite is 146,610 kg.

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The law of conservation of matter and the law of conservation of energy essentially state that neither type of energy can be created nor destroyed, only transformed. The process by which grapes ferment to produce wine is an illustration of the law of conservation of matter. The amount of matter in the reactants in the bottle doesn't change, but its chemical form does.

It is a fundamental tenet of classical physics that matter cannot be created or destroyed in an isolated system; rather, it can only be changed from one form to another. This means that despite the apparent changes that are seen, no matter is lost during any chemical or physical change that may occur with any substance.

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Answer:

The answer is A. The instant it is thrown.

Explanation:

Answer:

c. At the top.

Explanation:

A projectile path has a vertical and horizontal component to it or 2d kinematics. But gravity is acting on the projectile the whole time so it is going to stop it from going up and bring it back to the ground at its max ordinance. At that instant the velocity would be 0.

The time it takes for the ejected photoelectrons to travel 2.50 cm to the detection device is approximately 8.34 × 10⁻¹⁴seconds.

What is photoelectrons?

Photoelectrons are electrons that are emitted from a material when it is exposed to electromagnetic radiation, typically in the form of photons with sufficient energy. The phenomenon of releasing electrons from a material by incident light is known as the photoelectric effect.

When photons of light strike the surface of a material, they can transfer their energy to the electrons in the material. If the energy of the photons exceeds the material's work function (the minimum energy required to remove an electron from the material), the electrons can be liberated and become photoelectrons.

To calculate the time it takes for the photoelectrons to travel 2.50 cm, we can use the equation of motion for constant acceleration, which is s = ut + (1/2)at², where s is the displacement, u is the initial velocity, t is the time, and a is the acceleration.

In this case, the initial velocity of the photoelectrons is zero since they are ejected from rest. The acceleration can be calculated using Newton's second law, F = ma, where F is the force and m is the mass. In this case, since the electrons have negligible mass, the force is not a significant factor.

Since the displacement, s, is given as 2.50 cm, we can rearrange the equation to solve for time, t. Since the acceleration is zero, the equation simplifies to s = ut. Rearranging the equation gives us t = s/u.

To find the velocity, u, we can use the equation E = hv, where E is the energy of the photons, h is Planck's constant, and v is the velocity of the photons. Rearranging the equation gives us v = E/h.

Using the given wavelength of 420 nm, we can calculate the energy of the photons using the equation E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength. Substituting the values and converting the energy from eV to joules, we find E = 2.11 × 10⁻¹⁹ J.

Plugging the values of s = 2.50 cm = 0.025 m and u = v = E/h into the equation t = s/u,

we find t = (0.025 m) / (2.11 × 10⁸ m/s) ≈ 8.34 × 10⁻¹⁴ seconds.

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Answer:

20 m/s

Explanation:

Use the position/displacement formula to find out how long the ball is in the air:

(distance) = (initial velocity)*(time) + (1/2)*(acceleration)*(time)^2

20 = 0*t + 1/2*10*t^2

t^2 = 4

t = 2 seconds

Use the velocity formula:

(final velocity) = (initial velocity) + (acceleration)*(time)

Vf = 0 + 10*2

Vf = 20 m/s

A gold leaf electroscope's cap develops a negative charge when a negatively charged rod is brought close to it; the case is then grounded, creating a negative charge in the leaf. Option D is correct.

When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.

Similar charges repel each other, whereas dissimilar charges attract each other.

The term "neutral" refers to an item that has no net charge. A charge is something experienced as a force in the electric and magnetic fields.

When a negatively charged rod is brought near the cap of a gold leaf electroscope whose case ad then is earthed, then the leaf has an induced negative charge.

Hence option D is correct.

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Answer:The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.

Explanation:

The type of stored energy that is transferred by burning fuels is chemical energy. Chemical energy is a form of potential energy that is stored within the chemical bonds of substances, such as the molecules of fuels. When fuels undergo combustion, such as the burning of gasoline, the chemical bonds within the fuel molecules are broken, and new bonds are formed.

During this chemical reaction, energy is released in the form of heat and light. The released energy is a result of the conversion of the potential energy stored in the chemical bonds of the fuel into other forms of energy, primarily thermal energy. This thermal energy can then be harnessed and used for various purposes, such as heating, generating electricity, or powering engines.

The process of burning fuels involves the oxidation of the fuel molecules, where they react with oxygen from the air. This reaction releases the stored chemical energy and converts it into thermal energy. The combustion process is exothermic, meaning it releases energy in the form of heat.

It's important to note that burning fuels also produces other byproducts, such as carbon dioxide and water vapor. These byproducts result from the chemical reactions occurring during combustion but do not directly represent the transfer of stored energy. The primary transfer of stored energy in the burning of fuels occurs through the conversion of chemical energy to thermal energy.

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The total travelled distance is • Speed, time and distance is one of the most common and important topics in the Mathematics or Quant section.

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.

For instance, 50 km/hr west denotes the velocity of a car whereas 50 km/hr (31 mph) denotes the speed at which it is moving down a route.

The average speed of an object is determined by dividing the distance traveled by the amount of time it takes the object to reach the distance.

Therefore, The total travelled distance is • Speed, time and distance is one of the most common and important topics in the Mathematics or Quant section.

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The magnitude of the force of kinetic friction between the block and the floor is 2.4N.

Kinetic friction is a force that exists between moving surfaces. A moving body on the surface is subjected to a force in the opposite direction of its movement. When two things rub against each other, the frictional force is turned into thermal energy, which in some situations causes fire. Kinetic friction is responsible for machine part wear and tear, so it is critical to lubricate the machine parts with oil.

F(x) = -kx, and k = 325 N/m for the spring.

0.250 kinetic coefficient of friction

From x = 0 to x = 0.70 metres, the spring compresses.

W net = 0 to 0.70 meter integral [- F spring - F friction] = 1/2 * (-k) * x2 - mu * mg * normal force x = 1/2 * (-325N/m) * (.70)2 - 0.250 * 6kg * 9.81m/s2 * 0.70 - 0

= - 89.93 Joules

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