(ii) Atmospheric pressure on that day is 1.0 x 10^5Pa
Calculate the total pressure at the bottom of the pond​

In thermodynamic equilibrium, the different forms of energy in a system, including vibrational energy, must be in balance. Therefore, if nitrogen is in thermodynamic equilibrium, its vibrational energy will be in balance with its other forms of energy.

The vibrational temperature of a gas is related to the average vibrational energy of its molecules. In the case of nitrogen, which is a diatomic gas, its molecules have multiple modes of vibration, including stretching and bending vibrations. The vibrational temperature of nitrogen can be calculated from the Boltzmann distribution, which relates the temperature of the gas to the relative populations of its energy states.

The vibrational temperature of nitrogen at room temperature is around 335 K. This is significantly higher than its translational temperature, which is around 300 K. The reason for this is that the vibrational energy of nitrogen molecules is not the same as their translational energy. While translational energy is associated with the motion of the molecule as a whole, vibrational energy is associated with the internal motion of the atoms within the molecule.

The vibrational temperature of a gas is not necessarily the same as its translational temperature, because the two forms of energy are not directly related. In a gas that is not in thermal equilibrium, the vibrational and translational temperatures can be different. However, in a gas that is in thermodynamic equilibrium, the different forms of energy will be in balance, and the vibrational temperature will be related to the translational temperature through the equipartition theorem.

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Answer:

0.0227528381

Explanation:

2.389/105

The object with least mass would have the least amount of kinetic-energy if they were traveling at the same speed.

Equation of kinetic energy is  [tex]KE = (1/2) mv^2[/tex]

m is the mass of the object and v is velocity.

From the equation of kinetic energy we can see two factors which kinetic energy is depends upon. First one is mass of the moving object. Second one is the velocity of the object.

Kinetic energy is directly depending on the mass of the object. That means if mass is higher, then kinetic energy also higher.

Likewise kinetic energy directly depends upon the square of the velocity of the object. So if velocity of A is twice than B, then the kinetic energy of A will be 4 times than of B.

In the question it is stated that objects are traveling at the same speed. If the speed is same that is if velocity is same, then the only factor that affects the kinetic energy will be mass of the moving objects.

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Vega and Sirius are both well-known stars that are often mentioned in astronomical and popular culture.

Vega is a bright, blue-white star located 25 light-years from Earth. It is one of the brightest stars in the night sky and is often used as a reference star in various astronomical studies.

Sirius, also known as the Dog Star, is the brightest star in the night sky and is located approximately 8.6 light-years from Earth. It is a binary star system, consisting of a main-sequence star (Sirius A) and a white dwarf star (Sirius B).

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The net force on an object is the overall force acting on it, taking into account the direction and magnitude of all the individual forces. In this case, a block is being pulled to the right with a force of 50 pounds and to the left with a force of 60 pounds.

These forces are in opposite directions, so to find the net force, we need to subtract the force acting to the left from the force acting to the right. This results in a net force of -10 pounds, indicating that there is an overall force acting on the block to the left. This net force would cause the block to accelerate in the opposite direction of the larger force .

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Fall height, h = 6.0 m

Initially, u = 12 m/s

Let,

The final speed is v be $

Now, according to the equation of energy conservation, = Initial total energy=Final total energy entails

1 /2  muΛ2+mgh= 1/ 2  mvΛ2\ indicates vΛ2 = uΛ2 + 2mgh \suggests vΛ2 = 12Λ2+2\ times 9.81 times\ 6.0\ implies v = 16.18 m/s$

The decision and practice of using less energy is known as energy conservation. Turning off the light when you leave a room, unplugging equipment when not in use, and walking instead of driving are all ways to save energy. Renewable energy sources are natural resources that can be transformed into these sorts of clean, useable energy: biomass, geothermal resources, sunshine, water, and wind. Bioenergy. Consuming less energy or reducing power consumption reduces the demand for energy production. There will be fewer carbon dioxide emissions, which will contribute to climate change. As a result, it will produce cleaner and healthier air.

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The number of electrons that corresponds to the number of charges is 2.71 × 10¹⁰ electrons.

The breakdown field strength of air is 3 × 10⁶ N/C, and the distance between the fingertip and the doorknob is 2 cm, so the electric field between the two is given by:

E = 3 × 10⁶ N/C

The electric field causes the charge on the fingertip to be drawn towards the doorknob, so we can calculate the charge on the fingertip using the formula:

q = 4π ε_0 x Er²

where;

r is the radius of the fingertip (0.71 cm) and

ε_0 is the permittivity of free space (8.854 × 10^-12 C^2/Nm²).

q = 4  x π  x 8.854 × 10⁻¹² x 3 × 10⁶  x  0.71²

q = 2.17 × 10⁻⁸ C

The charge on the doorknob is equal and opposite to the charge on the fingertip, so the total charge on both is calculated as;

Q_total =  2  x 2.17 × 10⁻⁸ C

= 4.34 × 10⁻⁸ C.

The number of electrons is calculated as follows;

number of electrons = q / e

where;

number of electrons = ( 4.34 × 10⁻⁸ C / 1.60218 × ⁻¹⁹ C )

number of electrons = 2.71 × 10¹⁰ electrons

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Answer:

A 220 N

Explanation:

it’s the only one not marked out on the photo. Hope this helps!

Explanation:

A man jumps out of an airplane and is accelerating towards the ground. Consider air resistance.

A) Draw the forces acting on the falling man.

There are two forces acting on the falling man: the force of gravity and the force of air resistance. The force of gravity is pulling the man downwards towards the ground, while the force of air resistance is pushing upwards against the man's motion.

F_gravity

↓

-------------

| |

| Man |

| |

-------------

↑

F_air resistance

B) Write a paragraph explaining your diagram and what is happening to the man.

The diagram shows the two forces acting on a man who is jumping out of an airplane and accelerating towards the ground. The force of gravity is the stronger force and is pulling the man downwards towards the ground, while the force of air resistance is pushing upwards against the man's motion. As the man falls, he gains speed due to the force of gravity, but the force of air resistance also increases. Eventually, the force of air resistance will become equal in magnitude to the force of gravity, and the man will reach a constant speed called the terminal velocity. At this point, the net force on the man will be zero and he will continue to fall at a constant speed.

C) What is the final velocity of the man after being in flight for 1.25 minutes.

Assuming that the man falls straight down without any additional forces or complications, we can use the equations of motion to calculate the final velocity.

First, we need to convert the time to seconds:

t = 1.25 minutes = 1.25 x 60 seconds = 75 seconds

Next, we need to know the acceleration due to gravity, which is approximately 9.8 m/s^2.

Using the equation:

v = u + at

where v is the final velocity, u is the initial velocity (which is zero in this case), a is the acceleration due to gravity, and t is the time in seconds, we can calculate the final velocity:

v = 0 + (9.8 m/s^2 x 75 s) = 735 m/s

Therefore, the final velocity of the man after being in flight for 1.25 minutes is approximately 735 m/s.

Note that this calculation assumes that air resistance is negligible, which is not entirely true. In reality, the man would experience air resistance and reach a lower terminal velocity. However, the effects of air resistance can be difficult to model accurately, and this simple calculation provides a reasonable approximation for the final velocity.

If a cyclist is travelling with a speed of 12 miles per hour.

A) Draw a diagram for the action of the cyclist.

The diagram for the action of the cyclist would show the direction of motion and the forces acting on the cyclist. Since the cyclist is travelling at a constant speed, the net force on the cyclist must be zero. The forces acting on the cyclist are the force of friction between the tires and the ground, the force of air resistance, and the force of gravity.

F_air resistance

↑

|

-------------------

| |

| Cyclist |

| |

-------------------

| |

F_friction ← |

In a frequency distribution, the bin widths are typically equal. Cross-sectional data does not employ line charts. Using a scatter plot, you can see trends over time. There must be two quantitative variables for a scatter plot (i.e., not categorical data). Thus, it is true.

The Pareto chart shows the few, most important flaws that account for the majority of the entire issue.

A Pareto chart makes it easier to see what elements make up the 20% that are the crucial few and what factors make up the inconsequential many by arranging the bars from the largest to the smallest.

The number of groups of classes that should be used to classify a distribution of observations according to the Sturges rule is 1 + 3.3 log n, where n is the total number of observations.

Therefore, it is true that a frequency distribution usually has equal bin widths.

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Photons can interact with charged particles in a number of ways, depending on the energy of the photon and the properties of the charged particle.

explain about the process of scattering ?

In the process of scattering, a photon collides with a charged particle, causing it to change direction. This can occur through various mechanisms, such as Compton scattering, where a photon transfers some of its energy to an electron, causing it to recoil and emit a new photon with a different wavelength and direction.

In the process of absorption, a photon is absorbed by a charged particle, which may then be excited to a higher energy level. This can occur through various mechanisms, such as the photoelectric effect, where a photon ejects an electron from an atom or molecule, or through excitation of the electrons in a material.

Overall, the interaction between photons and charged particles depends on the properties of both the photon and the charged particle, such as their energy, wavelength, and charge, as well as the physical environment in which they interact.

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During the phase of full moon, the phase you would see for Earth would be a new moon. This is because during a full moon, the Moon is on the opposite side of the Earth from the Sun, so the side of the Moon that is facing the Earth is fully illuminated by the Sun.

When the Moon is positioned so that it is on the other side of the Earth from the Sun, it enters the full moon phase. This indicates that the Moon's side facing Earth is entirely lighted by the Sun, giving it the appearance of a brilliant, rounded disk in the sky.

The lunar cycle's brightest and most noticeable phase, the full moon, usually lasts for one or two nights. The Moon looks to be brightest and fullest at this moment, giving the ground below a dazzling glow.

In many cultures, the full moon is a significant cultural emblem and is frequently linked to mystical or spiritual significance. Additionally, it has been the focus of various scientific studies, including research into its effects on human.

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The tension in the cord is T1 = m_2g and the radial force acting on the disk is F_radical = m_2g.

A), The speed of the disk is v=[tex]\sqrt{m_2Rg/m1}[/tex] , if mass block decreases tension & F_radial increase so radius decrease. If the mass of the block increases Tension & F_radial radius increase.

B). F_radical = T1

F_radical = m_2g

C). F_ Centripetal = m_1v²/ R

m_2g = m_1v²/ R

D). if the mass of the block decreases tension and F radical increase so radius decreases.  if the mass of the block decreases tension and F radical  increase

In physics, tension refers to the force that is transmitted through a string, rope, cable, or wire when it is pulled or stretched. The magnitude of the tension in a material is equal to the pulling force or stretching force that is being applied to it. Tension is a vector quantity, which means that it has both magnitude and direction.

The direction of tension is always along the length of the string or cable, away from the point where it is being applied. Tension plays an important role in various physical systems, including bridges, cranes, pulleys, and elevators. Engineers and designers must consider the tension in these structures to ensure their safety and functionality.

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Complete Question: -

A small disk of mass my is tied to a cord and allowed to move in a circle of radius R on a frictionless horizontal table. The cord passes through a small hole in the center of the table and a block of mass m, is suspended on the other end. The block remains stationary meanwhile the disk ok the table moves in a circle. a. What is the tension in the cord? b. What is the radial force acting on the disk? C. What is the speed of the disk? Describe what would happen to the disk if the mass of the hanging block is decreased (by removing part of the load), and what would happen to the disk if the mass of the hanging block is increased. ma

Dynamic equilibrium is a state in which bodies are moving at a constant speed as opposed to static equilibrium, which is a state in which bodies are at rest (rectilinear motion). The total amount of forces exerted on them in both situations is zero.

A system is said to be in a condition of static equilibrium when all of its parts are at rest and there should be no net force operating on it.

An object will be at rest since all the forces acting on it cancel one another. The branch of mechanics that studies forces acting on motionless things in an equilibrium state.

Static equilibrium means balanced torque, i.e. is

[tex]= T_1 + T_2 = 0[/tex]

[tex]= 100 \times 2 + 200 \times r = 0[/tex]

[tex]= r=1[/tex]

Therefore,  [tex]r=1[/tex]Which means bucket should be placed at [tex]1 m[/tex] From centre of man on opposite site of steelworker.

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To increase the precision and accuracy of a wavelength measurement, you can take the following steps:

Use a higher-quality measuring instrument: Using a higher-quality instrument that is designed to measure wavelength with high accuracy and precision can improve the results. For example, a high-quality spectrometer can be used to measure the wavelength of light.

Increase the number of measurements: Taking multiple measurements and averaging the results can reduce the effect of random errors and improve precision.

Minimize sources of error: Minimizing sources of error, such as fluctuations in temperature and pressure, can also improve the precision and accuracy of measurements.

Calibrate the instrument: Calibration of the instrument against a known reference can improve the accuracy of measurements.

Use appropriate units: Using appropriate units that are compatible with the instrument being used can prevent errors caused by unit conversions.

Overall, increasing precision and accuracy requires careful attention to the details of the measurement process, from the choice of instrument to the environmental conditions in which the measurement is made.

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Pressure between the carton and the floor will be 1871 N/m².

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

Given that a carton of paper has a mass of 22.7 kg. The area of the bottom is 0.119 m².

The pressure will be calculated as:-

P = Force / Area

Force =  Weight = mg

P = mg / A

P = ( 22.7 x 9.81 ) / 0.119

P = 1871 M / m²

Hence, the pressure will be 1871 N / m².

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A star with an absolute magnitude of -4 is brighter than one with an absolute magnitude of 6.

No matter how far a star is from Earth, its absolute magnitude provides a measure of its inherent brilliance. A difference of 5 magnitudes corresponds to a 100-fold increase in brightness on the logarithmic magnitude scale. The result is that a star with a smaller absolute magnitude is more bright than a star with a bigger absolute magnitude. By a difference of 10 magnitudes, or a factor of 10,000 in luminosity, the star with absolute magnitude -4 is brighter than the star with absolute magnitude 6, in this instance. In other words, the star with absolute magnitude -4 is 10,000 times more brilliant than the star with absolute magnitude 6, according to this statement.

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By changing the amplitude of a mass on a spring the maximum displacement, velocity, potential energy, and kinetic energy of the system are all affected.

A mass on a spring changes its greatest displacement from its equilibrium position as its amplitude is changed. This has numerous effects on how the mass-spring system moves:

1. Changing the amplitude of a mass on a spring has no effect on the motion's period, which remains constant. The object's mass and the spring's spring constant are the only factors that affect the period.

2. Increases in the maximum velocity of the mass are correlated with increases in the amplitude of the mass on the spring. This is because the mass accelerates more when it is further away from its equilibrium position when it encounters a stronger force from the spring.

3. The system's maximum potential energy rises because a mass on a spring has potential energy that is proportional to its square of displacement from equilibrium. As a result, increasing the mass of the spring's amplitude likewise raises the system's maximum potential energy.

4. The system's maximal kinetic energy rises: The kinetic energy of the mass on the spring oscillates between zero and a maximum value as it moves back and forth. The maximal kinetic energy of the system grows as the mass of the spring's amplitude increases.

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The work done by the checkout attendant of the supermarket is 4.536 Joules or 0.00108413 Kilocalories.

The checkout attendant at a Supermarket is pushing a can of soup with the force of 5.6 Newton.

He is able to push the can of soup still a distance of 0.810m horizontally.

We know the formula of the work done is given by,

W = Fd

Where, W is work done, F is the force, d is the distance.

Putting all the values,

W = 5.6 x 0.81

W = 4.536 Joules.

This same amount of work in kcal will be equal to 0.00108413 Kilocalaorie.

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We can determine the time period of oscillation of a known mass using a light spring and a meter scale without the use of a clock.

To find the time period of oscillation of a known mass using a light spring and a meter scale without the use of a clock, we can follow these steps:

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50.75 m/s will be the car's new speed. The law of conservation of momentum states that the momentum before and after a collision will be equal.

Momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum. Check out Newton's laws of motion. According to Newton's second law, if a particle is subjected to a constant force for a specific amount of time, the result of the force and time (referred to as the impulse) is equal to the change in momentum. On the other hand, a particle's momentum represents the length of time needed for a consistent force to bring it to rest.

Steps for calculation:

[tex]m1*v1 =m2*v2\\14500 *21 = 6000* v2\\50.75 m/s = v2[/tex]

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The following processes which do not depend on spontaneous radioactive decay is radium paint that makes watch dials glow in the dark which is therefore denoted as option A.

This is referred to as the property which is exhibited by certain types of matter of emitting energy and subatomic particles spontaneously.

Bone scanning is based on the spontaneous radioactive decay oftechnetium-pp methyldiphosphate and energy production of the sun involved nuclear fusion. However radium paint that makes watch dials glow in the dark do not depend on spontaneous radioactive decay as the glow is also added to substances for aesthetic effects whic would have deemed it harmful.

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The equivalent resistance of the resistive network is 6 ohms.

Resistance is the opposition to the flow of electric current, or the opposition to a change. It is caused by the collisions of electrons with the atoms in a material. Resistance is measured in Ohms and is represented by the Greek letter omega (Ω). Resistance is an important concept in electrical engineering and is used to calculate power, current, and voltage in electrical circuits. Resistance can be found in both conductors and insulators, and the resistance of a material depends on its composition, shape, and temperature. Resistance can be used to control the flow of current, protect circuits from damage, and convert electrical energy into heat. Resistance is an essential factor in determining the performance of electrical circuits.

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The ball will land 98.10 meters vertically below the point where it was thrown and the girl will find the ball 153.68 meters horizontally away from her and 98.10 meters vertically below her.

Since the ball is thrown horizontally relative to the girl, it has no vertical velocity component initially. Therefore, the only force acting on the ball after it is thrown is the force due to gravity, which causes it to follow a parabolic path.

We can use the fact that the horizontal motion of the ball is independent of the vertical motion to analyze each motion separately. Let's start with the horizontal motion:

The horizontal velocity of the ball remains constant at 34 m/s throughout its flight, so we can use the equation:

distance = speed x time

to determine the horizontal distance traveled by the ball.

We know that the ball is thrown at the same instant that the balloon is 100 m above the ground, so we can use this to find the time it takes for the ball to reach the ground.

The time taken for the ball to hit the ground is the same as the time taken for an object to fall 100 m under gravity, since they both have the same vertical acceleration due to gravity.

Using the equation:

distance = 1/2 x acceleration x time^2

with an initial velocity of 0 m/s and an acceleration of 9.8 m/s^2, we can find the time taken for the ball to hit the ground:

100 m = 1/2 x 9.8 m/s^2 x time^2

time^2 = 100 m / (1/2 x 9.8 m/s^2) = 20.41 s^2

time = sqrt(20.41 s^2) = 4.52 s (taking the positive square root)

Now we can use the horizontal distance equation to find the horizontal distance traveled by the ball during this time:

distance = speed x time = 34 m/s x 4.52 s = 153.68 m

So the ball will land 153.68 meters horizontally away from the point where it was thrown.

To find the vertical distance that the ball travels, we can use the same equation:

distance = 1/2 x acceleration x time^2

but this time with an initial velocity of 0 m/s and a time of 4.52 s (since the time taken for the ball to hit the ground is also the time taken for the balloon to descend 100 m).

Using the acceleration due to gravity of 9.8 m/s^2, we get:

distance = 1/2 x 9.8 m/s^2 x (4.52 s)^2 = 98.10 m

So the ball will land 98.10 meters vertically below the point where it was thrown.

Therefore, the girl will find the ball 153.68 meters horizontally away from her and 98.10 meters vertically below her.

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The line where the two charges meet is the point of attraction or repulsion. The square of the distance between the two charges and the strength of the force are inversely related. Thus, option C is correct.

Finally, there are two different kinds of electric charge, which we will refer to as positive charge and negative charge. According to Newton's third law, this is the strength of the force that one charge has on the other charge.

With the use of Coulomb's law, the force of electromagnetic attraction or repulsion between two charges can be determined.

In contrast to like charges, which resist one another, opposite charges attract one another. A positive charge therefore attracts a negative charge, but two negative charges repel one another.

Therefore, Two charges interact electromagnetically.

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The magnitude of the minimum force the professor needs to exert on the cart is approximately 150 N.

The acceleration of the cart can be found by equating the final kinetic energy (at the top of the ramp) to the initial kinetic energy:

(1/2) m v_final^2 = (1/2) m v^2

Solving for the final speed, we get:

v_final = sqrt(v^2 - 2 g h)

Substituting the given values, we get:

v_final = sqrt((5.3 m/s)^2 - 2 x 9.81 m/s^2 x 1.42 m) ≈ 4.23 m/s

Since we want the final speed to be at least 4.4 m/s, the cart will need to be accelerated at the top of the ramp. The minimum force required to provide this acceleration can be found as follows:

F = m (v_final^2 - v_desired^2) / (2 h)

where v desired is the desired speed at the top of the ramp (i.e., 4.4 m/s). Substituting the given values, we get:

F = 100 kg x (4.23 m/s)^2 - (4.4 m/s)^2) / (2 x 1.42 m) ≈ 150 N

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The height of the cliff is 13.2 meters. We can solve this problem using the kinematic equations of motion. The key equation that we need to use is the equation that relates the final velocity (vf), initial velocity (vi), acceleration (a), displacement (d), and time (t): [tex]vf = vi + at[/tex]

If we assume that upward is the positive direction, then the acceleration due to gravity (g) is negative (-9.81 m/s^2), and the initial velocity of the rock is +8.04 m/s. We want to find the height of the cliff, which is the displacement of the rock when it hits the ground. We can use the equation above to solve for the time it takes for the rock to reach its maximum height, and then use this time to calculate the height of the cliff.

Step 1: Find the time it takes for the rock to reach its maximum height

At the maximum height, the final velocity of the rock is zero, so we can set vf = 0 in the equation above and solve for the time, t:

[tex]vf = vi + at\\0 = 8.04 m/s - 9.81 m/s^{2}*t\\t =\frac{ 8.04 m/s }{ 9.81 m/s^{2}}\\t = 0.82 s[/tex]

So, it takes 0.82 seconds for the rock to reach its maximum height.

Step 2: Find the displacement of the rock when it hits the ground

Since the rock was thrown straight up, it will take the same amount of time to reach its maximum height as it will take to fall back to the ground. So, the total time of flight is 2*t = 1.64 s. During this time, the displacement of the rock is equal to the height of the cliff. We can use the equation that relates displacement to initial and final velocity and time:

[tex]d = vit + \frac{1}{2}a*t^{2}[/tex]

To use this equation, we need to find the final velocity of the rock just before it hits the ground. Since the rock was thrown straight up, its velocity when it hits the ground is equal in magnitude but opposite in direction to its initial velocity:

vf = -8.04 m/s

Now we can plug in the values and solve for the displacement:

[tex]d = vit +\frac{ 1}{2}at^{2}\\d = 8.04 m/s * 1.64 s +\frac{1}{2}(-9.81 m/s^2)*(1.64 s)^{2}\\d = 13.2 m\\[/tex]

Therefore, the height of the cliff is 13.2 meters.

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If a uniform conducting rod has a potential difference across its ends, a steady current will flow through it. Since the rod is uniform, the current density will also be uniform.

From Ohm's Law, we know that the current density (J) is equal to the electric field (E) divided by the electrical conductivity (σ) of the material. In this case, the material is a conductor, and so its electrical conductivity is very high.

The potential difference (V) across the rod is given as 41 mV. The length (L) of the rod is given as 22 cm. The formula for the electric field inside a uniform conductor is given by:

E = V / L

Substituting the given values, we get:

E = (41 mV) / (22 cm) = 1.86 V/m

However, the unit for the electric field is not volts/meter (V/m) but newtons/coulomb (N/C) or equivalently volts/meter (V/m). Therefore, we need to convert the units from volts/meter to newtons/coulomb by multiplying by the conversion factor of 1 V/m = 1 N/C. This gives us the final answer:

E = 1.86 N/C

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Two stars are of equal luminosity. Star A is 3 times as far from you as star B. Star A appears the same brightness as star B.

The amount of energy that a star or other astronomical object emits is measured by its luminosity, which is typically expressed in terms of brightness. It depends on the star's surface area, temperature, and proximity to the observer. The evolution of a star and its ultimate fate are greatly influenced by its luminosity.

Two stars are therefore equally bright. Star A is three times farther away than star B. The brightness of star A and star B are comparable.

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Using an electric kettle, 200 g of water at 100 is converted into steam at 100 in 300 seconds, so the specific latent heat of steam is 2250 j/g, and here the average of the electrical power used by the kettle is 1500 W.

The amount of heat required to convert 200 g of water at 100 °C to steam at 100 °C is explain below,

Q = m × L (m = mass of water; L = specific latent heat of steam)

Q = 200g × 2250 J/g = 450000 J

The time to convert the water into steam = 300 seconds, thus the average power used is:

P = Q/t = 450000 J/300 s = 1500 W

Hence, here the average of the electrical power used by the kettle with  200g of water is 1500 W.

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