a wire is drawn through a die, stretching it to six times its original length. by what factor does its resistance increase?

An inflated beach ball pushed beneath the water surface will swiftly shoot above the water surface when released due to the principle of buoyancy.

Buoyancy is a physical phenomenon that describes the upward force this is exerted on an item submerged in a fluid, inclusive of water or air. This pressure is a result of the pressure differences between the top and backside of an item in a fluid, and it is referred to as buoyant pressure.

Here, the beach ball is pushed beneath the water surface, it displaces a certain amount of water which will weight more than the beach ball itself. This cause acceleration upwards towards the surface when ball released.

If the object is less dense than the liquid, it will float. if the object is more dense than the liquid, it will sink.

Beach ball has a lower density than the water it displaces. So the buoyant force is so higher than a solid object of the same size and weight. The combination of buoyancy and the low density of air inside the beach ball causes it to shoot up quickly to the water surface when released.

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The one property of a main-sequence star that determines all its other properties is its mass. Option c is correct.

The main-sequence is a sequence of stars in which they spend most of their lifetimes. The position of a star on the main-sequence depends on its mass, which determines its luminosity, temperature, spectral type, and other properties. The more massive a star is, the hotter and brighter it is, and the shorter its lifetime.

Conversely, less massive stars are cooler and dimmer, and live much longer. The mass of a star also determines the reactions that occur in its core and the elements that are produced, shaping its evolution and eventual fate. Therefore, the mass of a main-sequence star is a fundamental property that determines most of its other characteristics. Hence option c is correct.

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Answer:

The period (T) of a satellite in a circular orbit can be determined using the formula:

T = 2πr/v

where r is the radius of the orbit and v is the speed of the satellite.

We can rearrange this formula to solve for v:

v = 2πr/T

Substituting the given values, we get:

v = 2π(3.5 × 10^7 m)/(6.3 h × 3600 s/h) ≈ 5,099 m/s

The centripetal force (F) that keeps the satellite in orbit is given by:

F = mv^2/r

where m is the mass of the satellite.

The gravitational force (Fg) between the satellite and Roton is given by:

Fg = GmM/R^2

where G is the gravitational constant, M is the mass of Roton, and R is the radius of Roton.

Since the satellite is in a circular orbit, the centripetal force is equal to the gravitational force:

mv^2/r = GmM/R^2

Simplifying and solving for M, we get:

M = v^2r/GR^2

Substituting the given values, we get:

M = (5,099 m/s)^2 × 3.5 × 10^7 m/(6.674 × 10^-11 m^3/kg s^2) × (1.75 × 10^7 m)^2 ≈ 8.35 × 10^23 kg

The free-fall acceleration (g) on the surface of Roton is given by:

g = GM/R^2

Substituting the calculated value of M and the given value of R, we get:

g = (6.674 × 10^-11 m^3/kg s^2) × (8.35 × 10^23 kg)/(1.75 × 10^7 m)^2 ≈ 8.73 m/s^2

Therefore, the magnitude of the free-fall acceleration on the surface of Roton is approximately 8.73 m/s^2

Average yearly high temperature decreases as elevation increases.

The difference in elevation between the two cities results in a difference in atmospheric pressure and thus a difference in temperature.

A decrease in latitude would likely increase the average yearly high temperatures of both cities due to the increased amount of solar radiation they receive.

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The changes in the variables that will result in no change in the gravitational force between m1 and m2 is if m1 is doubled and d is doubled. Option A.

The gravitational force between two masses depends on the masses and the distance between them, according to the equation F = G(m1m2)/d^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and d is the distance between them.

To have no change in the gravitational force between two masses, we need to keep the value of F constant. This can be achieved by changing the variables in the following way:

Therefore, the correct answer is a), where m1 is doubled and d is doubled.

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The force the floor typically applies to the ball is on average magnitude  is 750 N.

The initial momentum of the ball:

[tex]p_1 = m*v_1 = 0.3 kg * 4 m/s = 1.2 kg m/s[/tex]

The final momentum of the ball:

[tex]p_2 = m*v_2 = 0.3 kg * (-1 m/s) = -0.3 kg m/s[/tex]

The difference in momentum of the ball is therefore:

Δp = [tex]p_2 - p_1 = -1.5 kg m/s[/tex]

Δp = FΔt

Δt = 2×10^-3 s.

F = Δp/Δt = (-1.5 kg m/s)/(2×10^-3 s) = -750 N

|F| = 750 N

Magnitude is a term used to describe the size, amount, or extent of something. In science and mathematics, magnitude often refers to the numerical value or quantity of a measurement or vector. For example, the magnitude of a force is the amount of force being applied, while the magnitude of an earthquake is a measure of the energy released.

In astronomy, magnitude is used to describe the brightness of celestial objects such as stars and galaxies. The magnitude scale was developed by ancient Greek astronomers, with lower magnitudes indicating brighter objects. Today, astronomers use the apparent magnitude scale, which takes into account both the intrinsic brightness of an object and its distance from Earth. In general usage, magnitude can refer to the importance, impact, or significance of something.

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Values for P1, V1, and P2 to find the size of the tank needed to contain the helium at atmospheric pressure.

To determine the size of the tank needed to contain the helium at atmospheric pressure (1 atm), we need to use the ideal gas law formula:

PV = nRT
Where:
P = Pressure (in atm)
V = Volume (in liters)
n = Moles of gas
R = Ideal gas constant (0.0821 L atm/mol K)
T = Temperature (in Kelvin)
From the student question, we know that the initial pressure (P1) and volume (V1) are given. We also know that the final pressure (P2) is 1 atm. We need to find the final volume (V2).
Step 1: Calculate the moles of helium gas (n) using the initial conditions.
P1V1 = nRT1
n = (P1V1) / (RT1)
Step 2: Calculate the final volume (V2) using the moles of helium gas (n) and atmospheric pressure (1 atm).
P2V2 = nRT2
V2 = (nRT2) / P2
Since we want the tank size for the same amount of helium at atmospheric pressure, we can assume the temperature remains constant (T1 = T2). Therefore, you can simply use the initial conditions to find the final volume:
V2 = (P1V1) / P2
Plug in the given values for P1, V1, and P2 to find the size of the tank needed to contain the helium at atmospheric pressure.

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When a 2 uF and a 1 uF capacitor are connected in parallel and a potential difference is applied across the combination, the 2 uF capacitor has the highest charge. The total capacitance of the capacitors connected in parallel is the sum of their individual capacitances.

When a potential difference is applied across two capacitors connected in parallel, the potential difference across each capacitor is the same. In this case, the 2 uF and 1 uF capacitors are in parallel, so the potential difference across each capacitor is the same as the potential difference applied to the combination. Since the capacitance of the 2 uF capacitor is larger than the 1 uF capacitor, it will store more charge for the same potential difference applied across the combination. This means that the 2 uF capacitor will have a larger charge stored on its plates compared to the 1 uF capacitor The charge stored on a capacitor is directly proportional to its capacitance, so the 2 uF capacitor will have twice the charge stored on its plates as the 1 uF capacitor.

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Answer:

Fitness Level

Explanation:

The most likely difference between the two joggers who have similar levels of commitment and purpose but one is clearly better at jogging than the other is their fitness level. Fitness level refers to the level of physical fitness and conditioning of an individual, which is usually determined by their exercise habits, lifestyle, and genetics. A person with a higher level of fitness will generally be able to perform physical activities, such as jogging, more easily and with greater proficiency than a person with a lower level of fitness. Therefore, the jogger who is better at jogging is likely to have a higher level of fitness than the other jogger.

While factors such as body composition, motivation, and body positivity can also impact jogging performance, they are less likely to be the most significant difference between the two joggers in this scenario.

Answer:

The most likely difference between the two joggers is

B. body composition.

Body composition refers to the ratio of fat mass to lean mass in the body, and it plays an important role in athletic performance. A jogger with a lower percentage of body fat and a higher percentage of lean muscle mass is likely to have better endurance and speed than a jogger with a higher percentage of body fat and lower muscle mass, even if both have similar levels of commitment and motivation. Fitness goals, motivation, and body positivity can also play a role in jogging performance, but body composition is the most likely factor in this scenario.

The merry-go-rotational round's acceleration may be computed using the following formula: (final rotational velocity - starting rotational velocity) / time Equals rotational acceleration.

Using the provided values, we get: Rotational acceleration = (12.5 s x (18.6 rad/s - 2.5 rad/s 1.368 rad/s2 rotational acceleration As a result, the merry-go-rotational round's acceleration is 1.368 rad/s2. This suggests that the merry-go-rotational round's velocity is growing at a rate of 1.368 rad/s2. In other words, the rotational velocity of the merry-go-round increases by 1.368 radians per second for every second that passes. Understanding rotational acceleration is crucial in engineering and physics because it is used to describe the motion of spinning items like gears and wheels, which can affect their performance and stability.

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When the planet Mars is, on average, about 228 million km from the Sun, the correct option is about 1.52 hours.

The time it takes light from the Sun to reach Mars when the planet Mars is, on average, about 228 million km from the Sun is about 12.7 minutes.

The given question can be solved using the formula; Time = Distance / Speed of light

Given that Distance of Mars from the Sun = is 228 million km

The speed of light = 300,000 km/sNow, let's plug in the values in the formula.

Time = Distance / Speed of light = 228 × 106 km / 300,000 km/s = 760 secondsTherefore, the time taken for light to reach Mars from the Sun is 760 seconds.1 hour is equal to 3600 seconds.

Therefore, the time taken for light to reach Mars from the Sun is about 760 / 3600 hours = 0.21 hours or about 1.52 hours.

Hence, the correct option is about 1.52 hours.

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The magnitude of the radial component of acceleration is 1.25 m/s^2.

To solve this problem, we can use the formula for radial acceleration:

a_r = r * (Δω / Δt)

where a_r is the radial acceleration, r is the distance from the axis of rotation, Δω is the change in angular velocity, and Δt is the time interval over which the change occurs.

Plugging in the given values, we get:

a_r = 0.75 m * ((10 rad/s - 15 rad/s) / 3 s)

a_r = 0.75 m * (-1.67 rad/s^2)

a_r = -1.25 m/s^2

Note that the negative sign indicates that the acceleration is directed inward, towards the axis of rotation. So the magnitude of the radial component of acceleration is:

|a_r| = 1.25 m/s^2

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--The complete question is, What is the magnitude of the radial component of acceleration of a point located at a distance of 0.75 meters from the axis of rotation of a centrifuge, just as it begins its deceleration from an angular velocity of 15 rad/s to 10 rad/s over a time period of 3 seconds?--

When you are working on a magnetic levitation experiment in a lab and beta radiation is emitted directly at you, passing through the magnets first, you are not safe because it was beta radiation and very dangerous.

The correct answer is option a.

Beta radation is a form of ionizing radiation that is made up of high-energy beta particles. Beta particles are high-energy, high-speed electrons or positrons that are emitted by certain radioactive isotopes. The emission of beta radiation from radioactive materials is referred to as beta decay.

Beta particles, unlike alpha particles, have a longer range and can penetrate through paper, skin, and other low-density materials but can be blocked by high-density materials.

Therefore, option a is correct.

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Answer:

E

"As the distance increases by a factor, the electric force decreases by the square of that factor" best explains the relationship between the electric force between two charged objects and the distance between them.

The force exerted on the charged particles is inversely proportional to the square of the distance between them. The further they are the less the force the closer they are the more the force.

The correct answer between all the choices given is the last choice or letter E.

The component of the magnetic field along the y-axis should be zero when the dipole is oriented along the y-axis.

This is because the magnetic field lines of a dipole magnet are perpendicular to the axis of the magnet. When the dipole is oriented along the y-axis, the axis of the dipole is also along the y-axis. Therefore, the magnetic field lines of the dipole are oriented in the x-z plane and are perpendicular to the y-axis. As a result, the component of the magnetic field along the y-axis is zero.

In contrast, when the dipole is oriented along the x-axis, the axis of the dipole is parallel to the x-axis, and the magnetic field lines of the dipole are perpendicular to the x-axis. Therefore, the component of the magnetic field along the x-axis is zero. Similarly, when the dipole is oriented along the z-axis, the axis of the dipole is parallel to the z-axis, and the magnetic field lines of the dipole are perpendicular to the z-axis. Therefore, the component of the magnetic field along the z-axis is zero.

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A correlation of -0.9 mean : 2.) as one variable increases, the other variable decreases.

A correlation of -0.9 indicates a strong negative correlation between two variables, which means that as one variable increases, then other variable decreases. Closer is the correlation coefficient to -1,  stronger is the negative correlation between the variables. Hence, option 2)as one variable increases, the other variable decreases is the correct answer.

Since correlation is symmetrical and represents the strength of the association between two variables, it follows that the correlation between variables A and B and B and A are identical.

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When the switch is closed, the capacitor will start to charge. The bulb will light up and its brightness will gradually decrease as the capacitor charges. If the capacitor was twice as large, it would take longer for it to charge and the bulb would stay bright for a longer period of time.

If the bulb had half as much resistance, it would allow more current to flow through it and the bulb would be brighter. The capacitor would also charge faster. When the switch in the circuit is closed, the capacitor will start charging up from zero voltage. Once the capacitor is fully charged, the current in the circuit stops, and the voltage across the capacitor is equal to the voltage of the battery.

When the switch is closed, the capacitor starts charging up from zero voltage, and the voltage across the capacitor increases while the current flowing through the circuit decreases.  The resistor in the circuit limits the flow of current, causing the charging process to take some time.

During this charging process, the voltage across the capacitor increases, while the current flowing through the resistor and the capacitor decreases. As time goes on, the voltage across the capacitor approaches the voltage of the battery in the circuit, which is 12 volts in this case. Once the capacitor is fully charged, the current flowing through the circuit stops since no more charge can be stored in the capacitor.

During the charging process, the voltage across the resistor decreases, as the voltage across the capacitor increases. Once the capacitor is fully charged, the voltage across the resistor becomes zero, and the voltage across the capacitor is equal to the voltage of the battery.

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Complete question:

In the circuit on the right, the capacitor is initially uncharged. a. Describe what is observed when the switch is closed. b. How would your observations be changed capacitor were twice as large? c. How would your observations be changed if the bulb had half as much resistance?

1. Car A will travel farther than Car B after 10 s.

2. Car A will have a larger kinetic energy due to its greater mass.

3. Car A will have a larger momentum due to its greater mass.

Assuming both cars have the same constant acceleration, the car with the greater weight (Car A) will travel farther after 10 s according to the equation d = 0.5at^2, where d is the distance, a is the acceleration, and t is the time. Therefore, Car A will travel farther than Car B after 10 s.

The kinetic energy of a moving object is given by the equation KE = 0.5mv^2, where KE is the kinetic energy, m is the mass, and v is the velocity. Both cars have the same acceleration, so after 10 s, the car with the higher velocity will have a larger kinetic energy. Assuming both cars accelerate uniformly, Car A will have a larger kinetic energy due to its greater mass.

The momentum of an object is given by the equation p = mv, where p is the momentum, m is the mass, and v is the velocity. After 10 s, the car with the higher velocity will have a larger momentum. Assuming both cars accelerate uniformly, Car A will have a larger momentum due to its greater mass.

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--The complete question is, Car A is 1000g in weight and B is 800g. Both car begin from rest and start at same position.
1. which car has traveled farther after 10 s?

2. after 10 s which car has a larger kinetic energy?

3. after 10 s which car has a larger momentum?--

To remain stationary in a downward-directed electric field of magnitude 670 N/C, the electric force acting on the charged particle must be equal in magnitude and opposite in direction to the gravitational force acting on the particle.

The gravitational force acting on the particle can be calculated using the formula Fg = mg, where m is the mass of the particle and g is the acceleration due to gravity (9.81 m/s^2).

Fg = mg = (1.46 g)(9.81 m/s^2) = 14.33 × 10^-3 N

The electric force acting on the charged particle can be calculated using the formula Fe = qE, where q is the charge of the particle and E is the electric field strength. Fe = qE = (q)(670 N/C)

To remain stationary, the electric force and gravitational force must be equal and opposite, so we can set them equal to each other and solve for the charge q: Fe = Fg

[tex](q)(670 N/C) = 14.33 × 10^-3 N[/tex]

[tex]q = (14.33 × 10^-3 N) / (670 N/C)[/tex]

[tex]q = 2.14 × 10^-5 C[/tex]

Since the particle is stationary in a downward-directed electric field, the charge must be negative, so the charge of the particle is[tex]-2.14 × 10^-5 C.[/tex]

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The rise in temperature of the iron part of the machine is approximately 9.6°C.

Heat transfer is the movement of thermal energy from one object or system to another due to a temperature difference. Thermal energy, which is the energy associated with the motion of particles within a substance, always moves from higher temperature regions to lower temperature regions until thermal equilibrium is achieved.

To calculate the rise in temperature of the iron part of the machine, we can use the following formula:

Q = m × c × ΔT

where Q is the heat absorbed by the iron part of the machine, m is the mass of the iron part, c is the specific heat capacity of iron, and ΔT is the rise in temperature.

First, we need to calculate the heat generated by the machine in 2 minutes, using its input power and efficiency:

P = 2 kW

Efficiency = 80% = 0.8

t = 2 minutes = 120 seconds

Energy generated by the machine = P × t × efficiency

Energy generated by the machine = 2 kW × 120 s × 0.8

Energy generated by the machine = 192 kJ

Next, we can calculate the mass of the iron part of the machine using its density:

Density of iron = 7.87 g/cm³ = 7870 kg/m³

Mass of iron part = 40 kg

Now, we can substitute the values into the formula and solve for ΔT:

Q = m × c × ΔT

ΔT = Q / (m × c)

ΔT = 192000 J / (40 kg × 500 J/kgK)

ΔT = 9.6°C

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The given options to the question must also include 9.6°C.

The maximum kinetic energy of the ejected electrons is approximately 1.16 eV. To find the maximum kinetic energy (KE) of ejected electrons, we can use the photoelectric effect equation:

KE = hf - W

where h is Planck's constant [tex](4.14 × 10^(-15) eV·s)[/tex], f is the frequency of the electromagnetic radiation, W is the work function (2.34 eV), and KE is the maximum kinetic energy.

First, we need to find the frequency (f) using the wavelength (λ) given:

c = λf

where c is the speed of light [tex](3 × 10^8 m/s)[/tex].

1. Convert the wavelength to meters: [tex]442 nm × 10^(-9) m/nm = 4.42 × 10^(-7) m[/tex]

2. Rearrange the equation to solve for [tex]f: f = c / λ[/tex]

3. Calculate [tex]f: f = (3 × 10^8 m/s) / (4.42 × 10^(-7) m) ≈ 6.79 × 10^14 Hz[/tex]

Now, we can find the maximum kinetic energy (KE) using the photoelectric effect equation:

4. Calculate KE: [tex]KE = (4.14 × 10^(-15) eV·s × 6.79 × 10^14 Hz) - 2.34 eV ≈ 1.16 eV[/tex]

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The inductance of the coil is 0.028 H.

To find the inductance of the coil, first, we need to determine the change in current (∆I) and the rate of change of current (dI/dt).

1. Calculate the change in current: ∆I = I_final - I_initial = 2.20 A - 3.70 A = -1.50 A.

2. Calculate the rate of change of current: dI/dt = ∆I / ∆t = -1.50 A / 0.520 s = -2.885 A/s.

3. Use Faraday's Law: |emf| = L * |dI/dt|, where emf is the average induced electromotive force, and L is the inductance.

4. Solve for L: L = |emf| / |dI/dt| = 16.0 mV / 2.885 A/s = 0.028 H.

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The magnitude of the momentum of the rifle due to recoil after firing is 0.13 kg*m/s. The negative sign indicates that the rifle recoils in the opposite direction of the bullet's motion, by the law of conservation of momentum.

According to the law of conservation of momentum, the total momentum before and after an event must be the same. In this case, the momentum of the rifle and the bullet before firing is zero because they are at rest. After firing, the momentum of the bullet is given by the product of its mass and velocity, which is:

p_bullet = m_bullet * v_bullet

= 0.050 kg * 600 m/s

= 30 kg*m/s

The momentum of the rifle due to recoil can be found by multiplying the negative of the bullet's momentum by the mass ratio of the rifle to the bullet since the total momentum must be zero:

p_rifle = -m_bullet/m_rifle * p_bullet

= -(0.050 kg)/(11.5 kg) * 30 kgm/s

= -0.13 kgm/s

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[tex]h=v_i_yt+\frac{1}{2}gt^2\\ \\h=\frac{1}{2}(9.81m/s^2)(4s)^2\\[/tex]

h = 78.48 m

Answer:

Explanation:

where h is the height of the cliff, g is the acceleration due to gravity, and t is the time it takes for the ball to hit the ground.

where d is the distance traveled, v is the initial horizontal velocity, and t is the time it takes to travel the distance.

Since the ball is projected horizontally, its initial horizontal velocity is constant, and we can assume it is the same as the speed at which it hits the ground. Therefore, we can write:

Substituting in the given values, we get:

It takes 120 j of effort to extend a spring 0.3 m from its equilibrium state. The value of the spring constant k is 2666.67 N/m.

The work done to stretch a spring is given by the formula:

W = 0.5 × k × x^2

where W is the work done, k is the spring constant, and x is the distance the spring is stretched from its equilibrium position.

In this problem, we know that the work done is 120 J and the distance the spring is stretched is 0.3 m. Substituting these values into the formula, we get:

120 = 0.5 × k × 0.3^2

Simplifying the equation, we get:

k = 120 / (0.5 × 0.3^2)

k = 2666.67 N/m

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Water pressure 2m below the surface of a small pond is the same as water pressure 2m below the surface of any other body of water, which is determined by the weight of the water above it.

Water pressure is determined by the depth of water, the density of the water, and gravity. The pressure at a particular depth is determined by the weight of the water column above that point. Therefore, the water pressure 2m below the surface of a small pond is greater than the water pressure 2m below the surface of a larger body of water, such as a lake or ocean. This is because the weight of the water column above a given point is greater in a larger body of water.

Additionally, water pressure increases with depth regardless of the size of the body of water. This is due to the increasing weight of the water column above and the corresponding increase in the force of gravity acting on the water molecules.

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Answer: constant and horizontal; changing (usually increasing) and downward

Explanation:

in a projectile, there is not horizontal acceleration (unless friction), which means the velocity is constant horizontally. vertically, there is gravity so that the vertical velocity would be increasing, zero at the top, and then decreasing, and the y vector pointing downwards

Dylan's weight (the gravitational force due to the earth) would decrease to 1/9 of its original value if he tripled his distance from the center of the earth by flying in a spacecraft.

The force of gravity, which determines the weight of an object, is proportional to the mass of the two objects involved (in this case, Dylan and the Earth) and inversely proportional to the square of the distance between them.

The formula for the gravitational force is F = GmM/r², where G is the gravitational constant, m and M are the masses of the two objects, and r is the distance between them.

If Dylan tripled his distance from the center of the Earth, his distance from the center would become three times larger than before. Using the inverse square law, the gravitational force he experiences would be nine times smaller (3²) than it was before.

Therefore, his weight would decrease to 1/9 of its original value, which is 600 N/9 = 66.67 N.

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