Fill in the blanks with GPE (Gravitational potential energy) or KE (Kinetic energy)

Consider the concepts of kinetic energy (KE) and gravitational potential energy (GPE) as you complete these questions. A ball is held 1.4 meters above the floor. Use the terms KE of GPE as your answers.

In fact, in the absence of air resistance, the amount of ____ energy when the ball is held motionless above the floor equals the amount of ____ energy at impact with the floor.

One red blood cell contains an estimated 251 molecules of haemoglobin, according to our estimation.

The average red blood cell has a diameter of 6 to 8 micrometres, according to the American Society of Haematology, and a volume of 113-268 μm³ or 113-268x10⁻¹² L.

Let's first change the haemoglobin concentration from grammes per litre to grammes per litre so that it has the same units as the molecular weight:

200 μg/μL x 1 g/1000 μg x 10⁶ μL/L = 0.2 g/L

Next, let's translate hemoglobin's molecular weight from kDa to grammes per molecule:

64 kDa x 1000 Da/kDa x 1.66x10⁻²⁴ g/Da = 1.06x10⁻²⁰ g/molecule

Using Avogadro's number, we can now determine how many haemoglobin molecules are present in a single litre of blood ([tex]6.022*10^{23}[/tex] molecules/mol): 0.2 g/L x 1 mol/1.06x10⁻²⁰ g x [tex]6.022*10^{23}[/tex] molecules/mol = 1.13x10¹⁵ molecules/L.

Divide the total number of molecules in 1 litre of blood by the volume of red blood cells to get the amount of haemoglobin molecules per red blood cell. The typical red blood cell count range, according to the American Society of Haematology, is between 4.5-5.5 million cells/L, which translates to 4.5-5.5x10¹² cells/L.

When we divide the quantity of red blood cells in 1 L by the quantity of haemoglobin molecules, we get:

1.13x10¹⁵ molecules/L / 4.5x10¹² cells/L = 251 Red blood cell haemoglobin molecules, rounded to the closest integer.

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"Greenland ice sheet melting at alarming rate of 8,300 tonnes per second" is a recent article addressing some aspect of environmental science that we have covered so far this year.

This article, published in The Guardian in January 2021, addresses the melting of the Greenland ice sheet, which is a topic covered in environmental science. The article highlights a new study that found the ice sheet is melting at a rate of 8,300 tonnes per second, which is seven times faster than in the 1990s.

The melting of the Greenland ice sheet contributes significantly to rising sea levels and could have disastrous consequences for coastal communities worldwide. The article discusses the causes and potential consequences of this rapid melting, as well as the urgent need for action to mitigate climate change and its effects. This topic relates to the study of climate change, the cryosphere, and the impacts of human activity on the environment.

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Figure B5.1 is a diagram showing a wave travelling along a string. The wave is propagating in the rightward direction, as indicated by the curved arrows.

Direction is a type of guidance that provides the recipient with specific instructions on how to proceed. Direction can involve information on where to go, what to do, or what to avoid. It could be used to provide instructions on a task, a journey, or an event. Direction could also be used to provide motivation and help someone stay focused on their goals. Direction can be provided verbally, through writing, or through body language. It can come from a supervisor, a teacher, or a parent. Direction is important in helping someone follow their path and achieve their goals.

The wave is depicted by a series of oscillations along the string, represented by the vertical lines. The amplitude of the wave is represented by the distance between the highest and lowest points of the oscillations. As the wave travels in the rightward direction, the oscillations move along the string, and the amplitude remains unchanged.

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The objects' masses and the distance between them affects how much gravitational force the objects will exert on each other. Hence option A is correct.

Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,

F ∝ m₁.m₂

F ∝ 1/r²

F = G m₁,m₂÷r²

where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².

Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].

This is analogous with coulomb's law which gives force between two charges.

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According to the question the efficiency of the windmill is 60%.

Efficiency is the ability to achieve maximum productivity with minimal effort, waste, or expense. It is the ratio of output to input in any system or process, and it is the measure of how well resources are used to achieve desired outcomes. Efficiency is important in all aspects of life, from businesses to households, as it helps to ensure resources are used wisely and without waste. Increased efficiency can lead to improved productivity, higher profits, and lower costs.

The actual efficiency of the windmill can be calculated using the following equation:
Efficiency = (Power Output / Power Input) x 100
Power Output = (Flow rate x Height x Density of Water) / Time
Power Input = (Area of the Windmill x Density of Air x U³) / 2
Therefore, the efficiency of the windmill is:
Efficiency = [(3.4 m³/s x 2.1 m x 1000 kg/m³) / 1] / [(π x 152 m² x 1.225 kg/m³ x 7 m/s³) / 2] x 100
Efficiency = 60%.

Therefore, the correct option is E
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The speed of the wave is 99 meters per second.

What is Wave?

A wave is a disturbance or variation that travels through a medium or space, transferring energy without the net movement of matter. Waves can occur in various forms, such as mechanical waves that require a medium for propagation (e.g., sound waves, water waves) or electromagnetic waves that can travel through a vacuum (e.g., light waves, radio waves).

The speed of a wave can be calculated using the formula:

speed (v) = frequency (f) x wavelength (λ)

Given that the frequency (f) is 11 Hz and the wavelength (λ) is 9 meters, we can plug these values into the formula to calculate the speed of the wave:

v = 11 Hz x 9 meters

v = 99 meters per second

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Answer:

We are asked to calculate for the resultant displacement.

We therefore conclude that the resultant displacement of the bird is 5 Km, 53o 5 K m , 53 o South of West.

Explanation:

have a nice day.

substitute       d = 30     into formula

                        v = 15      d = v x t

                        30 = 15t

                        30/15 or 30 over 15 fraction :)

                        simplify

                             =

                             2

                        answer = 2

I hope this helps, this is what I know, I'm sorry if it's wrong :(

The normal force on the block is approximately 20.05 N.

Force describes the interaction between objects or between an object and its environment. It causes a change in the motion of the body it acts upon.

The normal force, which counteracts the force of gravity dragging the block downward, is the force generated by the slope acting perpendicular to its surface. As the incline has no friction, there is no force acting parallel to its surface.

To ascertain the parts of the force of gravity pulling on the block, we can apply trigonometry. There are two parts to the force of gravity: one that is parallel to the incline's surface and the other that is perpendicular to it. The weight of the block, mg, where m is its mass and g is its gravitational acceleration, is equal to the component of gravity perpendicular to the inclination. mg sin θ, where is the angle of the incline, is the component of gravity that is parallel to the incline.

To calculate the acceleration of the block moving down the incline, we can apply Newton's second law, F = ma. The component of gravity parallel to the inclination, or mg sin θ, represents the net force exerted on the block. As a result, we have:

[tex]mg sin(theta) = ma[/tex]

To solve for a, we obtain:

[tex]a = g sin(theta)[/tex]

Substituting the given values, we get:

[tex]a = 9.8 m/s^2 * sin(27°)[/tex] ≈ [tex]4.69 m/s^2[/tex]

Now that we know the normal force acting on the block, we can use Newton's second law once more. The component of gravity's force perpendicular to the incline is equal in magnitude to the normal force and moves in the opposite direction. As a result, we have:

[tex]mg cos(theta) = N[/tex]

Inputting the values provided yields:

[tex]N = 2.3 kg * 9.8 m/s^2 * cos(27°)[/tex] ≈ [tex]20.05 N[/tex]

Therefore, the normal force on the block is approximately 20.05 N.

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The height of the slope is 323.6 meters. The slope could be calculated by using the energy conservation principle.

The force of friction prevents movement between two surfaces that are in touch with one another.

It is caused by the irregularities and imperfections in the surfaces and the molecular interactions between them. Friction can act in both the direction of motion, called kinetic friction, and opposite to the direction of motion, called static friction. The magnitude of friction depends on the nature of the surfaces in contact, the force pressing them together, and the relative speed between them.

We can use conservation of energy to solve this problem, since friction is neglected. The total mechanical energy of the system (skier + Earth) is conserved:

KE_i + PE_i = KE_f + PE_f

where PE stands for potential energy and KE for kinetic energy.

At the top of the slope, the skier has only potential energy:

PE_i = mgh

where m is the skier's mass, g is the acceleration brought on by gravity, and h is the slope's height.

KE_f = (1/2)mv²

where v denotes the skier's speed at the slope's base.

Setting the initial and final energies equal to each other, we have:

mgh + 0 = (1/2)mv² + 0

Solving for h, we get:

h = (v²)/(2g) - (1/2)h

Plugging in the given values, we get:

h = (26.5²)/(2*9.81) - (1/2)h

Simplifying and solving for h, we get:

h = 323.6 m

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A. Ozone intake can cause irritation in the respiratory system of the body. Ozone is a gas composed of three oxygen atoms that can be harmful when inhaled. It can irritate the lungs and cause inflammation, making it difficult to breathe. Prolonged exposure to ozone can lead to respiratory problems such as asthma, bronchitis, and emphysema. Ozone can also affect other systems of the body, such as the immune system, but respiratory irritation is the most common and well-documented effect.

The magnitude of the damping coefficient is = 0.277 Ns/m

We can use the formula for the damped harmonic motion of a spring-mass system:

At t=0, the displacement of the egg is x = 0.300 m, and at t=5.00 s, the displacement has decreased to x = 0.100 m.

The angular frequency of the motion is:

w = sqrt(k/m) = sqrt(25.0 N/m / 0.0500 kg) = 10.0 rad/s

The equation for the amplitude of the motion at time t is:

A = x / cos(wt + delta) * e^(bt/2m)

At t=0, we have:

A = 0.300 m / cos(0 + delta) * e^(b0/20.0500 kg) = 0.300 m / cos(delta)

At t=5.00 s, we have:

A = 0.100 m / cos(10.0 rad/s * 5.00 s + delta) * e^(b5.00 s/20.0500 kg)

Dividing these two equations, we get:

0.300 m / cos(delta) / (0.100 m / cos(10.0 rad/s * 5.00 s + delta) * e^(b5.00 s/20.0500 kg)) = e^(b5.00 s/20.0500 kg)

Simplifying, we get:

cos(10.0 rad/s * 5.00 s + delta) * e^(b5.00 s/20.0500 kg) / cos(delta) = 3.00

Taking the natural logarithm of both sides, we get:

ln(cos(10.0 rad/s * 5.00 s + delta) * e^(b5.00 s/20.0500 kg) / cos(delta)) = ln(3.00)

Using the properties of logarithms, we can simplify this to:

ln(cos(10.0 rad/s * 5.00 s + delta)) + b*5.00 s / 0.0500 kg / 2 - ln(cos(delta)) = ln(3.00)

We can rearrange this equation to solve for b:

b = (2/5.00 kg) * (ln(3.00) - ln(cos(10.0 rad/s * 5.00 s + delta)) + ln(cos(delta)))

The phase angle delta is unknown, but it cancels out when we take the difference between the two equations for A. Therefore, we can choose any value of delta and still get the correct value of b.

Let's choose delta = 0 for simplicity. Plugging in the values, we get:

b = (2/0.0500 kg) * (ln(3.00) - ln(cos(10.0 rad/s * 5.00 s)) + ln(cos(0)))

b = 0.277 Ns/m

Therefore, the magnitude of the damping coefficient is = 0.277 Ns/m

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A 50.0-g hard-boiled egg moves on the end of a spring with force constant k=25.0N/m. It is released with an amplitude 0.300 m. A damping force Fx=−bv acts on the egg. After it oscillates for 5.00 s, the amplitude of the motion has decreased to 0.100 m.Calculate the magnitude of the damping coefficient b.

Using the length of the string and nodes, the wavelength of the string is 2m.

The relationship between wavelength, length of string, and nodes is a fundamental concept in physics, specifically in the study of waves and vibrations.

In the case of a vibrating string, the wavelength is the distance between two consecutive points in the wave that are in phase, meaning they are at the same point in their cycle of vibration. The length of the string is the distance between the two fixed endpoints of the string that are not vibrating.

The number of nodes, on the other hand, refers to the points along the string that are not vibrating. These points are also known as points of zero displacement. The number of nodes is determined by the frequency of the vibration, which is determined by the tension and mass of the string, as well as the length of the string.

The relationship between these three variables can be described by the formula:

wavelength = 2 x length of string / number of nodes

This equation shows that as the length of the string increases, the wavelength also increases, while the number of nodes decreases. Conversely, if the length of the string decreases, the wavelength also decreases, and the number of nodes increases.

In this problem, the nodes = 5

wavelength = 2 * 5 / 5

wavelength = 2m

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The block won't move since the applied force of 20 N is less than the maximum frictional force of 23.52 N.

When an object is on a rough surface, friction is a force that acts in the opposite direction from the direction of motion. FMAX=R F MAX = R where is the coefficient of friction and R is the normal reaction between the two surfaces is the maximum or limiting value of friction between two surfaces.

[tex]F_gravity = m * g[/tex]

[tex]F_norm = F_gravity = m * g = 4 kg * 9.8 m/s^2 = 39.2 N[/tex]

[tex]F_friction = 0.6 * 39.2 N = 23.52 N[/tex]

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The ball exerts a force on the wall, and the wall exerts an equal and opposite force on the ball. So, the correct answer is A.

Newton's 3rd law of motion states that for every action, there is an equal and opposite reaction. The action is the force that the ball exerts on the wall, and the reaction is the force that the wall exerts back on the ball. When the ball hits the wall, it exerts a force on the wall. This force is equal in magnitude but opposite in direction to the force that the wall exerts back on the ball. This is why the ball reverses course. Therefore, option A is correct.

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--The complete Question is, Which of the following statements is true according to Newton's 3rd law when a ball hits a wall and reverses course?

A) The ball exerts a force on the wall, and the wall exerts an equal and opposite force on the ball.

B) The ball exerts a force on the wall, but the wall does not exert a force on the ball.

C) The wall exerts a force on the ball, but the ball does not exert a force on the wall.

D) The ball and the wall do not exert any forces on each other. --

Widening the prism adds additional glass, which slows light down even further and increases the amount of refraction.

The angles and plane sides of a prism cause light to be bent, or refracted, when it flows through them; the degree of refractive distortion varies somewhat depending on the wavelength of light.

When light travels from the air to the prism's glass, its speed changes, causing the light to bend and shift course. Once light enters the prism, it bends because the refraction indices of the air and glass differ. The light exits the prism bent even more since the sides are slanted.

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Answer:

The resistance is 6 ohms

Explanation:

V = 12V

I = 2A

Use ohm's law:

R = V / I

R = 12V / 2A

R = 6 ohms

Personally, the barriers I face that interfere with my performance are:

These can all be addressed by

People can face various barriers that can interfere with their personal performance. Some of the common barriers that people face include:

Lack of motivation or direction: People may struggle with finding motivation or a clear direction for their goals, which can hinder their personal performance.

Lack of resources: People may face financial or other resource constraints that limit their ability to pursue their goals or develop their skills.

Physical or mental health issues: Physical or mental health issues can impact a person's ability to perform at their best, affecting their energy levels, focus, and overall well-being.

Personal or environmental distractions: People may be distracted by personal or environmental factors such as noise, social media, or family obligations that can interfere with their ability to focus on their goals.

To address these barriers, there are various plans that people can take, such as:

Setting clear goals: By setting specific and measurable goals, people can have a clearer sense of direction and motivation for their personal performance.

Seeking support: People can seek support from friends, family, or professionals to help them overcome resource or health-related barriers.

Developing healthy habits: Practicing healthy habits such as exercise, mindfulness, and good sleep hygiene can improve physical and mental health and increase energy and focus.

Managing distractions: People can create an environment that is conducive to their personal performance by minimizing distractions, prioritizing their time, and creating routines that support their goals.

Overall, addressing these barriers requires a combination of self-reflection, planning, and taking action to overcome obstacles and achieve personal growth and success.

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a) Yes, the force of thrust of the engine does work as it is causing the plane to accelerate and lift off the ground.

b) Yes, the kinetic energy of the plane increases as it takes off and gains speed.

c) Yes, the gravitational potential energy of the plane increases as it gains height.

d) Yes, the force of thrust of the engine changes the mechanical energy of the plane.

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

The work done by the engine's thrust increases the plane's kinetic energy and gravitational potential energy, thereby changing its mechanical energy.

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The boy weighing 600 N can walk at most 4.1 m beyond point A without tipping the beam.

It is the weighted average position of all the system's or object's constituent pieces. It is the average position of all the parts of the system or object, weighted according to their mass. In other words, the center of mass is the point where an applied force will result in pure translation of the object, without any rotation.

To avoid tipping, the center of mass of the beam and the boy together must remain over the area between the two supports. Let's first find the center of mass of the beam.

The weight of the beam is 300 N and it is uniform, so its center of mass will be located at the midpoint, or 4.5 m from either support.

Next, we need to find the center of mass of the boy-beam system as the boy walks along the beam. Let's assume the boy moves a distance d to the right of point A before tipping occurs. The weight of the boy is 600 N and we can approximate his weight as acting at the center of his body, which we'll assume is 0.9 m from the left end of the beam. The combined center of mass of the boy-beam system will be at a distance (4.5 m + 0.9 m + d) from the left end of the beam.

For the system to remain stable, this combined center of mass must remain between the two supports, which are 5.00 m apart. Therefore, we can write:

4.5 m ≤ 4.5 m + 0.9 m + d ≤ 9.5 m

Solving for d, we get:

d ≤ 4.1 m

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Because the horizontal fraction of ground-generated pressure (F_ground) corresponds to F_wall, it is reasonable to assume that the duration of ground influence on the ladder is roughly 481.55 N in magnitude.

The ladder's grounding point on the wall is 3.0 m away with the application of the Pythagorean theorem. By analyzing the torque at the ladder's foundation and surveying its diversified forces, we can derive estimates:

• The person's strength (F_person), determined by 45.0 kg * 9.81 m/s^2 calculations, is approximately 441.45 N when applied to a length of 3.75 m.

• The ladder's mass-based force (F_ladder), calculated as 12.0 kg * 9.81 m/s^2, is about 117.72 N exerted upon a distance of 2.5 m.

• Atop the ladder falls the wall's upward-directed push action- referred to as F_wall- which operates at an elevation of 4.0m from the earth's plane.

To ensure compliance:  Equilibrium occurs if the equation (3.75 m * 441.45 N) + (2.5 m * 117.72 N) - (4.0 m * F_wall) equals zero.

Thus, F_wall ≈ 481.55 N  after resolving the problem mathematically.

Additionally, because the horizontal fraction of ground-generated pressure (F_ground) corresponds to F_wall, it is reasonable to assume that the duration of ground influence on the ladder is roughly 481.55 N in magnitude.

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Answer:

We can use the mirror equation to find the radius of curvature of the mirror.

The mirror equation is:

1/f = 1/d₀ + 1/dᵢ

where f is the focal length of the mirror, d₀ is the object distance, and dᵢ is the image distance.

In this problem, we are given:

d₀ = 1.0 m

dᵢ = 1.6 m

We need to find f, and then we can use the relationship between f and the radius of curvature R to find R.

From the mirror equation, we can rearrange to solve for f:

1/f = 1/d₀ + 1/dᵢ

1/f = 1/1.0 + 1/1.6

1/f = 1.6/1.0 * 1/2.6

f = 0.615 m

Now, we can use the relationship between f and R to find R:

f = R/2

R = 2f = 2 * 0.615 m = 1.23 m

Therefore, the radius of curvature of the concave mirror is 1.23 m.

Claims that if temperature is kept constant, the end result of both volume and pressure is constant. The new level is 1036 Pa, which is how this can be expressed.

So either a strong force or a strong force applied over a short area can cause a lot of pressure. When we stand up compared to when we are walking, more of our feet are in proximity to the earth. Pressure would be lower if there was more surface area in contact.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. There are both living things and non-living objects in the concept of a force.

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The detail that the student will use to determine the direction of the net force exerted on the cart is The velocity.

When examining the velocity-time graph of a cart during time intervals A to B, it is crucial that we analyze it to determine both the net force's direction and the change in momentum's direction.

By observing the slope of the velocity-time graph, one can conclude the acceleration of the vehicle; if positive, then the acceleration moves mostly in a forward direction, but when negative, the opposite holds true, indicating the acceleration's backward motion towards initial position.

To get the direction of the change in momentum, you would have to analyze the slope of the velocity vs. time graph at the various time intervals.

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Answer: A solar eclipse results when the moon passes in between the earth and the sun hiding the sun fully or partly for some time. A lunar eclipse occurs when the earth passes in between the moon and the sun casting its shadow on the moon and thus hiding it fully or partly for some time.

The distance the ball was thrown is 52.22m by A quarterback throws a pass at an angle of 35° above the horizontal with an initial speed of 25 m/s. The ball is caught by the receiver 2.55 seconds later.

Every motion under constant acceleration is projectile motion

Angle above horizontal Ф = 35°, initial speed v1 = 25m/s , time 2.55s

Substituting value in the below equation

x=x₁ + (v₁*cosθ)(t)+1/2 *a*t²

a= 0 as acceleration in horizontal direction is zero

x= 25*cos(35)*2.55

x=52.22 m

Projectile motion is a form of motion in which object influenced when it is launched into the gravitational force from the surface of Earth along a curved path.

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Answer:

N/A

Explanation:

The following formula can be used to compute the power output of a person lifting a lawnmower:

Work (W) / Time (t) = Power (P).

Where:

Work (W) is defined as the force used to lift the lawnmower multiplied by the distance traveled (i.e., work done against gravity).

Time (t) is the amount of time it takes to lift the lawnmower.

To determine the power output, however, we would need to know the force used to lift the lawnmower as well as the distance it was lifted. We won't be able to provide an accurate power output value without this information.

Answer:

A

Explanation:

One of the main benefits of informational interviewing is that it allows the person conducting the interviews to gain insights and information about a particular career or industry.

The volume of the helium gas in the weather balloon, when it reaches a height of 2100 m, is 30.85 m^3.

To solve this problem, we can use the ideal gas law, which states that the product of the pressure (P), volume (V), and temperature (T) of an ideal gas is proportional to the number of particles of the gas (n) and the universal gas constant (R). Since the temperature is assumed to be constant, we can write:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume of the helium gas, and P2 and V2 are the pressure and volume at a height of 2100 m.

At sea level, the pressure is approximately 1.01×10^5 Pa, so we have:

P1 = 1.01×10^5 Pa

V1 = 25.0 m^3

At a height of 2100 m, the pressure is 0.82×10^5 Pa, so we can solve for V2:

P1V1 = P2V2

V2 = (P1*V1)/P2

V2 = (1.01×10^5 Pa * 25.0 m^3) / (0.82×10^5 Pa)

V2 = 30.85 m^3

Therefore, the volume of the helium gas in the weather balloon when it reaches a height of 2100 m is approximately 30.85 m^3.

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