PLEASE HELP DUE IN MINS. Thanks

Answer:

when we get images from the telescope, we're not seeing those object like they are right now. we're seeing them like they looked when that light left those distant objects...... the animation cuts to a visualization of distant galaxies imaged by Hubble.

The magnitude of the average force exerted by the floor on the ball during the collision is 215 N, and the direction is upward.

What is Potential Energy?

Potential energy is the energy that an object possesses due to its position or configuration relative to other objects, or due to the configuration of its internal components. It is a form of energy that is associated with the forces that act on an object, such as gravity, electric forces, and magnetic forces.

(a) To determine the impulse delivered to the ball by the floor, we can use the principle of conservation of energy to relate the ball's potential energy at the initial height to its potential energy at the rebound height, taking into account the loss of energy due to the collision with the floor. We can then use the impulse-momentum theorem to relate the impulse to the change in momentum of the ball during the collision.

The initial potential energy of the ball is given by:

PEi = mgh = (0.215 kg)(9.81 m/s^2)(19.5 m) = 41.6 J

At the rebound height, the potential energy is:

PEf = mgh = (0.215 kg)(9.81 m/s^2)(15.0 m) = 31.7 J

The loss of energy due to the collision is:

ΔPE = PEi - PEf = 9.9 J

This energy loss is due to both the work done by the force of gravity during the downward motion and the work done by the force of the floor during the upward motion. However, since the ball rebounds to a height that is less than its initial height, we know that the impulse delivered by the floor must be in the downward direction, opposite to the direction of the ball's motion during the collision.

Using the impulse-momentum theorem, we can write:

J = Δp = mΔv

where J is the impulse delivered by the floor, Δp is the change in momentum of the ball during the collision, and Δv is the change in velocity of the ball during the collision. Since the ball is moving downward before the collision and upward after the collision, we can write:

Δv = vf - vi = (15.0 m/s) - (-15.0 m/s) = 30.0 m/s

where vi is the initial velocity of the ball (before the collision) and vf is the final velocity of the ball (after the collision).

Thus, the impulse delivered to the ball by the floor is:

J = mΔv = (0.215 kg)(30.0 m/s) = 6.45 kg · m/s (downward)

So, the magnitude of the impulse delivered to the ball by the floor is 6.45 kg · m/s, and the direction is downward.

(b) To determine the average force exerted by the floor on the ball during the collision, we can use the definition of impulse as the product of force and time, and the fact that the ball is in contact with the floor for a known amount of time.

We know that the ball is in contact with the floor for 0.0300 seconds. Therefore, the average force exerted by the floor on the ball during the collision is:

Favg = J / Δt

where Δt is the time interval during which the impulse is delivered. In this case, Δt is equal to the contact time, which is 0.0300 seconds.

Thus, the average force exerted by the floor on the ball is:

Favg = J / Δt = (6.45 kg · m/s) / (0.0300 s) = 215 N (upward)

So, the magnitude of the average force exerted by the floor on the ball during the collision is 215 N, and the direction is upward.

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The circuit is a series circuit since all of the components are connected in a single path.

The current that flows through each component is the same, and the voltage across each component is proportional to its resistance.

In this circuit, there are two resistors, R1 and R2, and a battery with an electromotive force (EMF) of E.

The voltage across each resistor can be determined using Ohm's law, which states that

V = IR,

where V is the voltage

           I is the current

           R is the resistance.
The total resistance of the circuit can be calculated using the formula:

R = R1 + R2.

Using Ohm's law, the current in the circuit can be found by dividing the voltage by the total resistance:

I = E / R
The voltage across each resistor can be found using

V1 = IR1 and V2 = IR2.

The total voltage of the circuit is equal to the sum of the voltages across each resistor

V = V1 + V2

Substituting the equations for V1 and V2 into the equation for V, we get;

V = I(R1 + R2)
Thus, we can use the following equations to solve for the different variables in the circuit:
R = R1 + R2
I = E / R
V1 = IR1
V2 = IR2
V = I(R1 + R2)
Using these equations, we can calculate the current, voltage, and power of the circuit.

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The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².

To calculate the average acceleration of the motorcycle, we can use the formula:

Average acceleration = (final velocity - initial velocity) / time

First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.

Converting the final velocity:

Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s

Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:

Average acceleration = (21.67 m/s - 0 m/s) / time

To find the time taken to reach this velocity, we need to use the formula for average speed:

Average speed = total distance/time

Rearranging the formula:

time = total distance / average speed

Plugging in the values:

time = 50 m / 21.67 m/s ≈ 2.31 seconds

Now we can calculate the average acceleration:

Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²

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The perimeter of the pool is approximately 206.85 feet if we use 3.14 as the approximation of the value of π.

In this case, the angle AOB is 360 degrees, so the arc length is:

arc length = (360/360) x 2π(25) = 50π feet

Finally, we can find the perimeter of the pool by adding up the lengths of the two semicircles and the arc AB:

perimeter = 2πr + 2r + arc length

perimeter = 2π(25) + 2(25) + 50π

perimeter = 50π + 50

Perimeter is a measurement of the distance around the edge of a two-dimensional shape, such as a square, rectangle, or circle. It is the sum of the lengths of all the sides that make up the shape. The perimeter is an important concept in geometry and is used to determine the amount of material needed to enclose or surround a shape, as well as to calculate the distance around a given route or path.

To find the perimeter of a shape, you simply add up the lengths of its sides. For example, if you have a square with sides that are each 5 units long, the perimeter would be 5 + 5 + 5 + 5 = 20 units. Similarly, if you have a circle with a radius of 10 units, the perimeter (also known as the circumference) would be 2πr or approximately 62.8 units.

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Complete Question: -

If AO is 50 feet, find the perimeter of the pool. (O is the center of the sector AOB. OA and OB are the diameters of two semi-circles.)

Considering the definition of velocity, the average velocity along the trail is 0.608 km/s east.

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction. So, it is considered a vector magnitude.

The velocity can be defined as the amount of space traveled per unit of time with which a body moves, considering the direction, and can be calculated using the expression:

velocity= distance traveled÷ time

In this case, you know:

Replacing in the definition of velocity you can obtain the time necessary to travel each trail:

1.7 m/s= 0.7 km÷ time of first half of a straight trail

1.7 m/s× time of first half of a straight trail= 0.7 km

time of first half of a straight trail= 0.7 km÷ 1.7 m/s

time of first half of a straight trail= 0.412 s

0.37 m/s= 0.7 km÷ time of second half of a straight trail

0.37 m/s× time of second half of a straight trail= 0.7 km

time of second half of a straight trail= 0.7 km÷ 0.37 m/s

time of second half of a straight trail= 1.892 s

Then, you know:

Replacing in the definition of velocity:

velocity= 1.4 km÷2.304 s

velocity= 0.608 km/s

Finally, the average velocity along the trail is 0.608 km/s east.

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Mechanical energy → Electrical energy → Thermal energy

What is mechanical energy?

Mechanical energy is the energy possessed by an object due to its motion or position. It is the sum of kinetic energy and potential energy of an object, which can be converted to other forms of energy, such as electrical energy or thermal energy.

What is electrical energy?

Electrical energy is the energy associated with the movement of electrons through a conductor or an electrical circuit. It is the result of the movement of charged particles, such as electrons, and is commonly generated by the conversion of other forms of energy, such as mechanical, chemical, or solar energy.

What is thermal energy?

Thermal energy is the energy associated with the temperature of an object or a system. It is the result of the movement of atoms and molecules in matter, which leads to the transfer of heat from hotter to cooler objects. Thermal energy is commonly measured in units of joules or calories and is proportional to the mass and temperature of an object or a system.

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Answer:

C. C

Explanation:

The ball will have its greatest kinetic energy just before it touches the ground which is at point C.

Kinetic energy of a body is the energy due to the motion of the body. As a body moves and its speed increases as a result of acceleration, then the kinetic energy will increase more.

As the body starts from rest, at point A, through B and C, the velocity increases drastically due the pull of the earth.

So, point C will show the greatest velocity and hence the most kinetic energy by the body.

Complete Question

How much tension (Fm) must be supplied by the triceps at the elbow joint to stabilize the arm against an external force (Fe) of 200 N given \(dm =  2 \  cm = 0.02 \  m\) and  \(d_e  =  25 \ cm  =  0.25 \ cm\)

Answer:

The force is \(F_m = 1000 \  N \)

Explanation:

From the question we are told that

   The external force is \(F_e   = 200 \  N\)

    The length from the wrist to the elbow is  \(d_e  =  25 \ cm  =  0.25 \ cm\)

    The length from the triceps to the elbow is \(dm =  2 \  cm = 0.02 \  m\)

at equilibrium

Taking moment about the elbow

     \(F_m *  d_m  - F_e * d_e =  0\)

=>    \(F_m *  0.02  - 200 * 0.25 =  0\)

=>    \(F_m *  0.02  - 200 * 0.25 =  0\)

=>    \(F_m = 1000 \  N \)

Answer:

4.41N or 4.5N (check explanation)

Explanation:

450g = 0.45kg

F = ma

Using 10m/s² = 10(0.45) = 4.5N

Using 9.8m/s² = 9.8(0.45) = 4.41N

Given:

The radius of the circle the dog makes is,

The dog runs in the circle 10 times in

The mass of tha bandanna is,

To find:

a) time period

b) speed of the dog

c) centripetal acceleration

d) the centripetal foce on the bandanna

Explanation:

a)

The time period of the dog is,

Hence, the period of the dog is 0.72 s.

b)

The speed of the dog is,

Hence, the speed of the dog is 8.72 rad/s.

c)

The centripetal acceleration is,

Hence, the centripetal acceleration is,

d)

The centripetal foce on the bandanna is,

Hence, the force is 1.13 N.

Answer:

wood, paper, air, and cloth

Explanation:

Metals and stone are considered good conductors since they can speedily transfer heat, whereas materials like wood, paper, air, and cloth are poor conductors of heat.

Hello!

a)
For a car on an incline, we only have the normal force and force of gravity acting on the car.

The car is only experiencing a net force caused by the sine component of the force of gravity vector, which causes it to slide down the incline towards the center of the curve.

Or, as an equation:

\(F_{net} = Mgsin\phi\)

This net force produces a centripetal force. Recall the equation for centripetal force:
\(F_c = \frac{mv^2}{r}\)

In reference to the 15° angle of the incline, the cosine component of the centripetal force is equivalent to the sine component of the force due to gravity (both parallel to the incline). So:
\(F_c cos\phi = Mgsin\phi \\\\\frac{mv^2}{r}cos\phi = mgsin\phi\)

Cancel out 'm' and solve for 'v'.

\(\frac{v^2}{r}cos\phi = gsin\phi\\\\v^2 = gr \frac{sin\phi}{cos\phi}\\\\v = \sqrt{grtan\phi}\)

Plug in the given values and solve.

\(v = \sqrt{(9.8)(85)tan(15)} = \boxed{14.94 \frac{m}{s}}\)

b)
Begin by converting 20.0 km/h to m/s.

\(\frac{20 km}{hr} * \frac{1 hr}{3600 s} * \frac{1000m}{1 km} = 5.556 \frac{m}{s}\)

For this situation, we also have the force of friction present along the axis of the sine component of the force of gravity that contributes to the net force.

Recall the equation of kinetic friction:
\(F_f = \mu_k N\)

In this situation, we have the sine (vertical) component of the centripetal force as well as the cosine component of the force of gravity making up the normal force, so:
\(F_f = \mu_k (\frac{mv^2}{r}sin\phi + mgcos\phi)\)

If a curve is banked at a slower speed than appropriate, the car will tend to slide towards the center. Thus, this force of friction points up the incline, opposite to the force due to gravity. We can do another summation of forces like above.

\(\frac{mv^2}{r} cos\phi= mgsin\phi - \mu_k (\frac{mv^2}{r}sin\phi + mgcos\phi)\)

Cancel out 'm' and simplify the equation further to solve for μ.

\(\frac{v^2}{r} cos\phi= gsin\phi - \mu_k (\frac{v^2}{r}sin\phi + gcos\phi)\\\\\mu_k (\frac{v^2}{r}sin\phi + gcos\phi)= gsin\phi - \frac{v^2}{r} cos\phi\\\\\mu_k = \frac{gsin\phi - \frac{v^2}{r} cos\phi}{(\frac{v^2}{r}sin\phi + gcos\phi)}\)

Plug in values.

\(\mu_k = \frac{9.8sin(15) - \frac{5.556^2}{85} cos(15)}{\frac{5.556^2}{85}sin(15) + 9.8cos(15)} = \boxed{0.2286}\)

To model the discovery of electromagnetic induction, Tonya should use the procedure of moving a magnet into a coil of wire in a closed circuit.

Tonya should use the procedure of moving a magnet into a coil of wire in a closed circuit.

Electromagnetic induction refers to the phenomenon of generating an electric current in a conductor by varying the magnetic field passing through it. This concept was discovered by Michael Faraday in the early 19th century. To model this discovery, Tonya needs to recreate the conditions that led to this breakthrough.

In Faraday's experiment, he observed that when a magnet is moved into or out of a coil of wire, it induces an electric current in the wire. This occurs when the magnetic field passing through the coil changes. Therefore, Tonya should use a similar setup to replicate this process.

Out of the given options, the most appropriate procedure for Tonya would be to move a magnet into a coil of wire in a closed circuit. By having a closed circuit, it means that the ends of the wire are connected to form a complete loop. When the magnet is moved into the coil, the changing magnetic field induces an electric current to flow through the wire.

This procedure demonstrates the principle of electromagnetic induction and shows how a changing magnetic field can produce an electric current. It allows Tonya to visually observe the effects of the induced current, which is essential in modeling the discovery of electromagnetic induction.

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The cone emits a single-frequency sound of 100 Hz and moves in a straightforward harmonic manner. The cone moves a maximum of 2.0 millimetres when it is making a loud sound.

Simple harmonic motion is a particular type of periodic motion of a body that arises from a dynamic equilibrium between an inertial force that is proportional to the acceleration of the body away from the static equilibrium position and a restoring force on the moving object that is directly proportional to the magnitude of the object's displacement and acts towards the object's equilibrium position.

In mechanics and physics, SHM is sometimes used to refer to this motion. If friction or any other energy dissipation is not present, it leads to an oscillation that is represented by a sinusoid and that lasts indefinitely.

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No effects of gravity on any person occurs due to presence in space.

Earth's gravity affects the motion of all the objects we see in our daily life because it moves them toward the center of the earth. In the space there is no gravity so the objects move freely so we can conclude that there is no effect of gravity on the individuals that move in the space.

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With a horizontal velocity of 3.04 m/s and a horizontal displacement of 1.68 m from the end of the diving board, the swimmer enters the water 1.70 metres below the diving board.

The rate at which something moves in a certain direction is referred to as its velocity. as quickly as a car travelling north on a highway or a rocket taking flight.

We can use the kinematic equations of motion to solve this issue.

Use the swimmer's horizontal travel distance as the displacement in the x-direction. Given that the swimmer enters the water 1.68 metres from the board's end, the following is the answer:

x=1.68 m and v0x=3.04 m/s

Δx = v0x * t

calculating t:

t = 1.68 m / 3.04 m/s because x / v0x.

t = 0.5526 s

Thus, the swimmer enters the water in 0.5526 seconds.

"y" equals "v0y*t" plus "(1/2)*a*t2"

replacing the values with:

Δy = 0 + (1/2) * (-9.81 m/s²) * (0.5526 s)²

Δy = -1.70 m

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Answer:

The gravitation force would weaken.

Explanation:

It would weaken as they would have less of a effect on eachother. Additionally, the sun would most likely grab the moon and catapult it.. but we dont talk about it.

Answer:

The vertical component of the velocity can be found using the formula:

V₀y = V₀ * sin(θ)

where V₀ is the initial velocity, θ is the angle of projection, and V₀y is the vertical component of the velocity.

Substituting the given values, we have:

V₀y = 48 * sin(53°)

Using a calculator, we can evaluate sin(53°) to be approximately 0.799:

V₀y = 48 * 0.799

V₀y ≈ 38.352

Therefore, the vertical component of the velocity with which the ball was launched is approximately 38 meters/second, which corresponds to option B.

Answer:

B.) 38 meters/second

Explanation:

Answer:

Solar energy is renewable.

Explanation:

If something is renewable, it is generated faster than it can be reasonably used or won't run out for longer than it would be used. Solar falls into the latter category. Using solar panels won't deplete the sun and the sun will likely be around for much longer than we will.

The acceleration of the hanging mass while the wheel's speed is increasing is 5,625 m/s².

Acceleration is a vector quantity that measures the rate of change of an object's velocity. It is defined as the rate at which an object's velocity changes over time. Acceleration can be positive, negative, or zero. Acceleration can be caused by forces such as gravity, friction, or thrust.

The acceleration of the hanging mass is determined by the torque (τ) and the moment of inTherefore, the acceleration of the hanging mass can be calculated as a = τ/I = (F×r)/(mr²) = F/(mr). In this case, F = 50 g, r = 30 cm and m = 16 spokes. We can convert the mass from grams to kilograms by dividing by 1000, giving us m = 0.016 kg.

Plugging these values into the equation, we get a = 50/(0.03×0.016) = 5,625 m/s².

Therefore, the acceleration of the hanging mass while the wheel's speed is increasing is 5,625 m/s².

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Answer: In a generator, the back and forth movement of electrons as the magnet spins and opposite poles of the magnet push the electrons in opposite directions is called Alternating Current (AC).

Explanation:

Answer:

alternating current and direct current

Explanation:

yall some of these questions arent that hard, use common sense

The skater's angular velocity after pulling in her arms and holding them tightly against her trunk will be approximately 89.5 rpm or 1.492 rps (revolutions per second).

To solve this problem, we need to apply the principle of conservation of angular momentum. Initially, the skater is spinning with her arms outstretched, and then she pulls her arms in and holds them tightly against her trunk. The total angular momentum before and after the change should remain the same.

Calculate the initial moment of inertia:

The moment of inertia of the skater with her arms outstretched can be calculated as the sum of the individual moments of inertia for each body part.

For the vertical cylinder (head, trunk, and legs):

Mass = 0.07 × 65.0 kg = 4.55 kg

Height = 1.60 m

Radius = (37.0 cm / 2) = 0.185 m

Moment of inertia for the cylinder = (1/12) × Mass × Height^2 + (1/4) × Mass × Radius^2

For the horizontal rods (arms and hands):

Each arm length = 74.0 cm = 0.74 m

Mass of each arm = 0.13 × 65.0 kg = 8.45 kg

Moment of inertia for each rod = (1/3) × Mass × Length^2

Total initial moment of inertia = Moment of inertia for the cylinder + 2 × Moment of inertia for each rod

Calculate the initial angular momentum:

The initial angular momentum is given by L = Iω, where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.

Convert the given initial angular velocity from rpm to rad/s:

Initial angular velocity = 62.0 rpm = (62.0 rpm) × (2π rad/rev) / (60 s/min) = 6.493 rad/s

Initial angular momentum = Total initial moment of inertia × Initial angular velocity

Calculate the final moment of inertia:

When the skater pulls her arms in and holds them tightly against her trunk, the moment of inertia changes. The arms and hands contribute no moment of inertia since they are now tightly held against the trunk.

The new moment of inertia will be that of the vertical cylinder alone.

Conservation of angular momentum:

According to the principle of conservation of angular momentum, the initial angular momentum should be equal to the final angular momentum.

Final angular momentum = Final moment of inertia × Final angular velocity

Since the total angular momentum remains constant:

Initial angular momentum = Final angular momentum

Calculate the final angular velocity:

Rearrange the equation to solve for the final angular velocity:

Final angular velocity = Initial angular momentum / Final moment of inertia

Substitute the known values and solve for the final angular velocity.

Convert the final angular velocity to rpm:

Final angular velocity (in rpm) = Final angular velocity × (60 s/min) / (2π rad/rev)

Therefore, the skater's angular velocity after pulling in her arms and holding them tightly against her trunk will be approximately 89.5 rpm or 1.492 rps (revolutions per second).

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The airplane will strike the ground at a horizontal distance of 490 meters.

To determine how far the airplane will strike on the ground, we need to consider the horizontal distance traveled by the airplane during its flight.

The horizontal distance traveled by an object can be calculated using the formula:

Distance = Speed × Time

In this case, the speed of the airplane is given as 100 meters per second and the time it takes to cover the distance of 490 meters is unknown. Let's denote the time as t.

Distance = 100 m/s × t

Now, to find the value of time, we can rearrange the equation as follows:

t = Distance / Speed

t = 490 m / 100 m/s

t = 4.9 seconds

Therefore, it takes the airplane 4.9 seconds to cover a horizontal distance of 490 meters.

Now, to calculate the distance on the ground where the airplane will strike, we can use the formula:

Distance = Speed × Time

Distance = 100 m/s × 4.9 s

Distance = 490 meters

It's important to note that this calculation assumes a constant speed and a straight flight path. In reality, various factors such as wind conditions, changes in speed, and maneuvering can affect the actual distance traveled by the airplane.

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A. When an object's acceleration vector points in the same direction as its velocity, the object speeds up without turning.

The average acceleration vector is defined as the rate at which the velocity changes with time.

When an object is slowing down, the acceleration of the object is in the opposite direction as the velocity.

Also, when an object is speeding up, the acceleration of the object is in the same direction as the velocity.

Thus, when an object's acceleration vector points in the same direction as its velocity, the object speeds up without turning.

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Radio waves are safe for diagnosing illnesses through magnetic resonance imaging due to their low energy.

Radio waves are useful for space research due to their long wavelengths.

Radio waves are waves which form a portion of the electromagnetic spectrum  that occur at lower frequencies than microwaves.

The frequencies of radio waves are as low as 3 Hz and as high as 1 gigahertz.

The wavelengths of radio waves occur within the range of thousands of meters to 30 cm.

The property radio waves that makes them safe for diagnosing illnesses through magnetic resonance imaging is their low energy as they are not ionizing.

The property that makes radio waves useful for space research is their long wavelengths which extends to thousands of meters.

In conclusion, radio waves are safe for magnetic resonance imaging and are applied in space research.

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Answer:

Which property best makes radio waves safe for diagnosing illnesses through magnetic resonance imaging?

✔ low energy of radio waves

Which property best makes radio waves useful for space research?

✔ long wavelengths of radio waves

Answer:

White hole is an impossible object in universe. ... This means that in a hypothetical universe where there is a black and a white hole, in a short time after their first interaction the white hole will become another black hole so that the system will end up with two black holes.

The satement that can be made about sound wave A and sound wave B is, they will slow down.

The relationship between sound waves and temperature is given by the following formula;

\(v = \sqrt{\frac{\gamma RT}{M} }\)

The speed of sound wave increases with increase in temperature, and vice versa.

Sound wave is mechanical wave, because it requires material medium for its propagation. Sound will travel faster in liquid medium than gaseous medium because of number of molecules per unit volume.

Thus, the satement that can be made about sound wave A and sound wave B is, they will slow down.

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