The coefficient of static friction between a 20 kg weight and a football turf is .85. What force is needed to make the weight start moving

This observation demonstrates the principle of electrostatics, which is the study of electric charges at rest. It highlights the fact that charged objects can interact with each other, and that opposite charges attract while like charges repel.

When a plastic rod is rubbed with cotton, electrons from the rod are transferred to the cotton, leaving the rod with an excess of positive charges, and the cotton with an excess of negative charges. This results in the rod acquiring a negative charge.

When the same cotton is brought near the cap of a positively charged electroscope, the leaves of the electroscope will diverge. This happens because the positively charged cap attracts the negative charges on the cotton, causing the electrons to move towards the cap. As a result, the leaves of the electroscope acquire a negative charge, and they repel each other due to their like charges.

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Humans detect infrared radiation released by things using a variety of senses. The ultimate response is that people recognise it by feeling warmth on their skin, having sharper vision, seeing light radiated by the item, and having goosebumps.

1. Skin detects warmth: Objects that produce infrared radiation also emit heat. The temperature sensors in the skin sense this heat energy, allowing people to experience warmth.

2. Improved vision: Infrared radiation may pass through some things like fog or smoke. Because infrared radiation bounces off things and reaches the eyeballs, people can see more clearly in low-light circumstances.

3. Light emitted by the object: When subjected to infrared radiation, certain items emit visible light. Certain types of security cameras, for example, detect movement using infrared radiation and can generate visible light as a result.

4. Goosebumps: Goosebumps are a natural reaction to temperature fluctuations or emotional stimulation.

When people are chilly or terrified, the muscles in their skin contract, causing the hair follicles to rise up and provide a "goosebump" sensation.

This reaction can also occur when the skin senses infrared light in order to regulate body temperature.

Overall, these sensory reactions enable people to perceive and respond to infrared radiation released by objects in their surroundings.

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Answer:

Approximately [tex]1.75\; {\rm s}[/tex] (assuming that [tex]g = 9.81\; {\rm m\cdot s^{-2}}[/tex] and that air resistance is negligible.)

Explanation:

Find the velocity of the ball right before landing using the following SUVAT equation:

[tex]\displaystyle v^{2} - u^{2} = 2\, a\, x[/tex],

Where:

Rearrange this equation to find [tex]v[/tex]:

[tex]\begin{aligned}v &= \sqrt{u^{2} + 2\, a\, x} \\ &= \sqrt{(8.45)^{2} + 2\, (9.81)\, (29.8)}\; {\rm m\cdot s^{-1}} \\ &\approx 25.61\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].

Divide the change in velocity by acceleration to find the time elapsed:

[tex]\begin{aligned}t &= \frac{v - u}{a} \\ &\approx \frac{25.61 - 8.45}{9.81} \; {\rm s}\\ &\approx 1.75\; {\rm s}\end{aligned}[/tex].

(a)Since the integral does not converge to 1, we can conclude that the wave function is not normalized, (b) The normalization constant for the given wave function is A = √10.

In quantum mechanics, the wave function is a mathematical description of the state of a quantum system. It encodes the probability amplitude for a particle or collection of particles to have certain properties, such as position or momentum.

a- To check if the wave function is normalized, we need to calculate the integral of the absolute value squared of the wave function over all space and check if it equals 1. Mathematically, this can be written as:

∫|Ψ(x,t)|^2dx = ∫Ψ*(x,t)Ψ(x,t)dx

where Ψ*(x,t) is the complex conjugate of the wave function.

Substituting the given wave function, we get:

∫|Ψ(x,t)|^2dx = ∫e^(−5x) e^(iwt) e^(5x) e^(−iwt) dx

= ∫1dx

= x

Since the integral does not converge to 1, we can conclude that the wave function is not normalized.

b- To normalize the wave function, we need to find the normalization constant A such that the integral of the absolute value squared of the normalized wave function over all space equals 1. Mathematically, this can be written as:

∫|AΨ(x,t)|^2dx = 1

where Ψ(x,t) is the given wave function.

Substituting the given wave function and the definition of the normalization constant A, we get:

∫|AΨ(x,t)|^2dx = ∫|A|^2 e^(−10x)dx = |A|^2 ∫e^(−10x)dx = |A|^2 * 1/10

For the integral to equal 1, we need |A|^2 * 1/10 = 1, which gives us:

|A|^2 = 10

Taking the positive square root, we get:

|A| = √10

So, the normalization constant for the given wave function is A = √10.

Therefore, The wave function is not normalised since the integral does not converge to 1, and the normalisation constant for the specified wave function is A = √10.

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The amount of Sertaline will you give to the patient is 30 mg that is half of the given 60mg tablet.

To give the patient a 30mg measurement of Sertraline when the accessible dose is 60mg tablets, one-half of the tablet ought to be given. The tablet ought to be part in half employing a pill cutter and after that one of the parts oughts to be managed to the persistent. This will give the persistent the precise 30mg measurements that have been requested. 

Sertraline is an antidepressant pharmaceutical utilized to treat depression, obsessive-compulsive disorder, freeze clutter, post-traumatic stretch clutter, social uneasiness clutter, and premenstrual dysphoric disorder. It belongs in the course of drugs known as selective serotonin reuptake inhibitors (SSRIs) and works by expanding the sum of serotonin, a natural substance within the brain, which makes a difference to preserve mental adjustment. Sertraline is as a rule taken once day by day, with or without nourishment, and ought to be taken as coordinated by a healthcare supplier. 

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Answer:

1) = approximately 74 km/hr
2) = 9:30 AM
3) Avg speed = 28 km/hr
   vel = 0.

Explanation:

Here is how you do it:

1) To find the student's speed, we can use the formula:

Speed = Distance / Time

The student traveled a total distance of 40 km south and 15 km north, which gives a total distance of 40 km + 15 km = 55 km. The total time of travel was 0.75 hours.

Speed = 55 km / 0.75 hr ≈ 73.33 km/hr

Therefore, the student's speed is approximately 73.33 km/hr or 74 km/hr.

To calculate the student's velocity, we need to consider both magnitude and direction. Since the student ended up at the same position as the starting point, the displacement is zero. Therefore, the velocity is also zero.

2) The distance between Houston and Austin is 190 miles. The bus is traveling at a constant speed of 54.3 miles/hour. We can use the formula:

Time = Distance / Speed

Time = 190 miles / 54.3 miles/hour ≈ 3.50 hours

The bus will arrive in Austin approximately 3.50 hours after leaving Houston.

If the bus leaves Houston at 6:00 am, it will arrive in Austin around 9:30 am.

3) The girl rode 5 km east and then turned around and rode 2 km west. The total distance traveled is 5 km + 2 km = 7 km. The entire trip took fifteen minutes, which is equal to 15/60 = 0.25 hours.

Average Speed = Total Distance / Total Time

Average Speed = 7 km / 0.25 hr = 28 km/hr

Therefore, the girl's average speed is 28 km/hr.

To calculate the girl's velocity, we need to consider both magnitude and direction. The girl's initial direction was east, and her final direction was west. Since the starting and ending points are the same, the displacement is zero. Therefore, the velocity is also zero.

Answer:

As can be seen from the above animation, the package follows a parabolic path and remains directly below the plane at all times.

Explanation:

hope it helps

The statement "Many different scientists have added data from their own experiments to build the theory" is correct of the question.

Scientific theory involves thoroughly examining a specific event or collection of events and developing an intricately detailed conclusion backed up by significant data.

As such, this ultimate level represents our unsurpassed comprehension concerning how nature operates - offering us unparalleled clarity that exceeds any other form of understanding.

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The particle's average speed after 10 seconds is 110 m/s, and its average velocity is zero.

When a particle is thrown upwards, its initial velocity is in the upward direction and its acceleration is in the downward direction due to gravity. The acceleration due to gravity is approximately 10 m/s² near the surface of the Earth. Therefore, the particle's velocity decreases at a rate of 10 m/s² until it reaches its highest point, where its velocity is zero. After that, the particle's velocity becomes negative and it starts to fall back to the ground.

To find the particle's average speed after 10 seconds, we need to calculate the total distance traveled by the particle in 10 seconds. The formula to calculate the distance traveled by a particle under constant acceleration is:

distance = initial velocity * time + (1/2) * acceleration * time²

Substituting the given values, we get:

distance = 60 m/s * 10 s + (1/2) * 10 m/s² * (10 s)²

distance = 600 m + 500 m

distance = 1100 m

Therefore, the average speed of the particle after 10 seconds is:

average speed = total distance / total time

average speed = 1100 m / 10 s

average speed = 110 m/s

To find the particle's average velocity after 10 seconds, we need to calculate the displacement of the particle in 10 seconds. Displacement is the change in position of the particle, which is equal to the difference between its final and initial positions. Since the particle is thrown upwards and then falls back to the ground, its displacement after 10 seconds is zero. Therefore, the average velocity of the particle after 10 seconds is also zero.

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Answer:

Therefore, the period of vibration for a wave with a wavelength of 0.5 m moving at a speed of 6.0 m/s is approximately 0.0833 seconds.

Explanation:

To find the period of vibration, we can use the formula:

period = wavelength / speed

Given:

Wavelength (λ) = 0.5 m

Speed (v) = 6.0 m/s

Substituting the values into the formula:

period = 0.5 m / 6.0 m/s

Calculating the value:

period ≈ 0.0833 seconds

Answer:

Yeah

Explanation:

Thermoproteota is a prokaryote.

Prokaryotes are unicellular

The coefficient of static friction between a 20 kg weight and a football turf is .85. Force of approximately 166.6 Newtons (N) is needed to make the weight start moving.

The force needed to make the 20 kg weight start moving can be determined using the coefficient of static friction. The equation for static friction is:

Frictional force = coefficient of static friction * normal force

The normal force is the force exerted by the surface perpendicular to the weight. In this case, it is equal to the weight of the object, which can be calculated as the mass (20 kg) multiplied by the acceleration due to gravity (9.8 m/s^2):

Normal force = mass * gravity = 20 kg * 9.8 m/s^2 = 196 N

Now, we can calculate the force needed to make the weight start moving:

Frictional force = 0.85 * 196 N ≈ 166.6 N

Therefore, a force of approximately 166.6 Newtons (N) is needed to overcome the static friction and make the 20 kg weight start moving on the football turf. This force must be applied in the opposite direction to the frictional force to initiate motion.

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The speed of the running shaft driving the machine, given that the main shaft to drive the machine has a pulley of diameter 140 mm is 111.4 rev/min

First, we shall list out the given parameters from the question. Details below:

The speed of the running shaft can be obtain as shown below:

S₁D₁ = S₂D₂

183 × 140 = S₂ × 230

183 × 140 = S₂ × 230

25620 = S₂ × 230

Divide both sides by 230

S₂ = 25620 / 230

S₂ = 111.4 rev/min

Thus, we can conclude that the speed of the running shaft driving the machine is 111.4 rev/min

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a. The rock's gravitational potential energy, just before touching the ground is 0 J.

b. The rock's kinetic energy, just before touching the ground is 24,500 J.

The rock's gravitational potential energy, just before touching the ground is calculated as follows;

Just before touching the ground, the rock will have maximum velocity, and the kinetic energy of rock will be maximum while the gravitational potential energy will be minimum or zero.

P.E (top height) = K.E (minimum or zero height)

P.E = mgh

where;

P.E = 10 x 9.8 x 250

P.E = 24,500 J

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To find the electric field components E(x) and E(y) at any point, we need to take the negative gradient of the potential function V.

Let's first find the partial derivative of potential function V with respect to x:

∂V/∂x = a(3x² - y²)/(x² + y²)^(5/2) - b x/(x² + y²)^(3/2)

Similarly, the partial derivative of V with respect to y is:

∂V/∂y = -2a xy/(x² + y²)^(5/2) - b y/(x² + y²)^(3/2)

Now, we can find the components of the electric field:

Ex = -∂V/∂x = -a(3x² - y²)/(x² + y²)^(5/2) + b x/(x² + y²)^(3/2)

Ey = -∂V/∂y = 2a xy/(x² + y²)^(5/2) + b y/(x² + y²)^(3/2)

Therefore, the  components of the electric field at any point (x,y) are:

Ex = -a(3x² - y²)/(x² + y²)^(5/2) + b x/(x² + y²)^(3/2)

Ey = 2a xy/(x² + y²)^(5/2) + b y/(x² + y²)^(3/2)

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Answer:

Image distance: object distance + focal length or, 8.0 + 3.0 so 11.0cm

Object distance: image distance - focal length or 11.0 - 3.0 so 8.0cm

Answer: B.

Explanation:

An isotope is a variation of the same element with a different number of neutrons in its nucleus. The only thing that changes is the top component, which is the total number of protons and neutrons. The bottom component remains the same (the number of protons).

Answer: The correct answer is:

the area of the trapezoid under the line

To explain this, let's consider the velocity vs. time graph again. Since the object moves with constant acceleration, the graph will be a straight line with a positive slope. The area under the line represents the distance traveled by the object, which is equal to the displacement if the initial position is zero.

The area under the line is a trapezoid because the velocity is changing over time. The base of the trapezoid is the time interval, and the heights are the initial and final velocities. The formula for the area of a trapezoid is:

Area = (base1 + base2) / 2 * height

where:

base1 = initial velocity

base2 = final velocity

height = time interval

Substituting the given values, we get:

Area = (v_i + v_f) / 2 * t

where v_i = 3 m/s, v_f = 10 m/s, and t is the time interval over which the velocities change.

Therefore, the correct answer is the area of the trapezoid under the line.

The wavelength of the sound wave with a frequency of 415.3 Hz is approximately 3.565 m.

The speed of sound in water is approximately 1482 m/s. Use the formula v = f × λ, where v = velocity (speed of sound), f = frequency, and λ = wavelength.

Given:

Frequency of the first sound wave (f₁) = 257.2 Hz

Wavelength of the first sound wave (λ₁) = 3.25 m

Velocity of sound in water (v) = 1482 m/s

Rearrange the formula to solve for λ₂ (wavelength of the second sound wave):

v = f × λ

λ = v / f

Substituting the values:

λ₂ = v / f₂

= 1482 m/s / 415.3 Hz

Calculating:

λ₂ ≈ 3.565 m

Therefore, the wavelength of the sound wave with a frequency of 415.3 Hz is approximately 3.565 m.

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Answer:

6,063.63637 kg m/s²

Explanation:

First you have to find the acceleration

a = velocity changes / time changes

(a stands for acceleration)

so we have 52-23 = 29 m/s

we know acceleration took 11 seconds so the time changes = 11 seconds

a= 29 / 11 = 2.63636364 m / s²

and we know

F = m × a

( F stands for force and m stands for mass)

so we have 2300kg × 2.63636364 m/s = 6,063.63637 kg m/s² or 6,063.63637 Newton

hope you understand ♥️

Answer:

d

Explanation:

reversing the current, reverses the poles of the electromagnet....this keeps the rotor spinning in the stationary mag field

a) The current through R₂, R₃ and R₄ is 8/3 mA, 4/3 mA, and 40 mA respectively

The resistor with resistance R₄ is connected in series with the resistor R₁, thus the current through them is the same and 40 mA.

The parallel combination of R₂ and R₃ is connected in series with R₁ thus the current through the parallel combination is 40mA

Resistance in parallel = 5 * 10 / 5 + 10 = 10/3

Current = 40 mA

Voltage = IR according to Ohm's Law

V = 10/3 * 40

= 40/3 mV

Since voltage drop is equal in parallel combination,

40/3 = I * 10

I = 4/3 mA (R₃)

40/3 = I * 5

I = 8/3 mA (R₂)

b) The potential difference between A and B is 11.83 V

[tex]V_{AB[/tex] = 1.5 - iR

= 1.5 - 10/3 * 40

= 1.5 - 40/3

= 1.5 - 13.33

= 11.83 V

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The work done to lift a man and a 44-pound box up 10 meters of stairs is 11,772 J, and the power required to do this in 1 minute is 196.2 W.

a. First, we need to convert the units of the weight of the box to kilograms: 44 pounds = 20 kg. The total mass that the man needs to lift up the stairs is therefore 100 kg + 20 kg = 120 kg.

The force required to lift this mass against gravity is given by F = mg, where g is the acceleration due to gravity (9.81 m/s^2). So, F = 120 kg x 9.81 m/s^2 = 1177.2 N. The work done is then given by W = Fd, where d is the distance moved (10 meters).

Thus, W = 1177.2 N x 10 m = 11,772 J.

b. To find the power required, we need to divide the work done by the time taken. As the time is given in minutes, we need to convert it to seconds: 1 minute = 60 seconds. Therefore, the power required is P = W/t = 11,772 J / 60 s = 196.2 W.

Therefore, the work done to lift the man and the box up a flight of stairs 10 meters high is 11,772 J, and the power required to do this in only 1 minute is 196.2 W.

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Answer:

The correct answer is option B: 47.11°.

Explanation:

To calculate the angle of refraction when light passes from air to water, we can use Snell's law, which states:

n₁ * sin(θ₁) = n₂ * sin(θ₂)

where:

n₁ = refractive index of the medium of incidence (in this case, air) = 1.0

n₂ = refractive index of the medium of refraction (in this case, water) = 1.33

θ₁ = angle of incidence

θ₂ = angle of refraction (what we want to find)

Given:

θ₁ = 77º

Let's plug in the values into Snell's law and solve for θ₂:

1.0 * sin(77º) = 1.33 * sin(θ₂)

sin(77º) = (1.33 * sin(θ₂)) / 1.0

Now, isolate sin(θ₂) by multiplying both sides by 1.0:

sin(77º) * 1.0 = 1.33 * sin(θ₂)

sin(θ₂) = (sin(77º) * 1.0) / 1.33

Now, take the inverse sine (arcsin) of both sides to find θ₂:

θ₂ = arcsin((sin(77º) * 1.0) / 1.33)

Calculating the value:

θ₂ ≈ 47.11º

Therefore, the angle of refraction in the water when the angle of incidence is 77º is approximately 47.11º.

The height to which the object is lifted is 0.14 meters.The problem seems to involve the concept of work, potential energy, and equilibrium.

The upward force of 442N must be balanced by the downward force of the object's weight to maintain equilibrium. Assuming the object is stationary, we can equate the upward force to the weight of the object:

442N = weight of the object

Weight = m * g, where m is the mass of the object and g is the acceleration due to gravity (9.8m/s^2).

So, 442N = m * 9.8m/s^2

Solving for m, we get m = 45.10 kg.

Now, the work done by the applied force of 32N over a distance of 2m is given by W = F * d = 32N * 2m = 64 J (Joules).

As the object is lifted, its potential energy increases by the amount of work done on it. This potential energy is given by the formula:

Potential energy = m * g * h

where h is the height to which the object is lifted.

Equating the work done on the object to the increase in its potential energy, we get:

64 J = 45.10 kg * 9.8m/s^2 * h

Solving for h, we get h = 0.14 m (rounded to two decimal places).

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The emf induced in the toroid when the current decreases from 2.5 A to 1.1 A in a time of 0.15 s is 220 V.

The emf induced in a toroid can be given by the formula:

emf = -N (dΦ/dt)

where N = number of turns in the toroid and dΦ/dt = rate of change of the magnetic flux through the toroid.

To find the magnetic flux through the toroid, use the formula:

Φ = μ0 N I A / (2πr)

where μ0 = permeability of free space, I = current in the toroid, A = cross-sectional area of the toroid, and r = radius of the toroid.

Substituting the given values:

Φ = (4π x 10⁻⁷ T m/A) x (3143 turns/m) x (2.5 A) x (1.4 x 10⁻⁶ m²) / (2π x 0.073 m) = 0.0105 Wb

The rate of change of magnetic flux can be found by taking the derivative of the magnetic flux with respect to time:

dΦ/dt = -ΔΦ / Δt = -(0.0105 Wb) / (0.15 s) = -0.070 T/s

Finally, substitute the values into the formula for emf:

emf = -N (dΦ/dt) = -(3143 turns/m) x (-0.070 T/s) = 220 V

Therefore, the emf induced in the toroid when the current decreases from 2.5 A to 1.1 A in a time of 0.15 s is 220 V.

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It takes approximately 0.00000144/45 = [tex]3.2\times 10^{-8}[/tex] seconds, or 32 nanoseconds, for the capacitor to lose 20% of its initial energy when it discharges through a 45Ω resistor.

To determine how long it takes a charged capacitor to lose 20% of its initial energy when it discharges through a resistor, we need to use the formula for the energy stored in a capacitor, which is given by:

[tex]E = (1/2)CV^2[/tex]

where E is the energy in joules, C is the capacitance in farads, and V is the voltage across the capacitor in volts. The energy stored in a capacitor is proportional to the square of the voltage across it.

When the capacitor discharges through a resistor, the voltage across it decreases over time, and the energy stored in the capacitor is converted into heat energy in the resistor. The rate at which the energy is dissipated is given by:

[tex]P = IV = V^2/R[/tex]

where P is the power in watts, I is the current in amperes, and R is the resistance in ohms.

Using the above equations, we can determine the time it takes for the capacitor to lose 20% of its initial energy as follows:

First, calculate the initial energy stored in the capacitor:

[tex]Ei = (1/2)(80\times 10^{-6})(V^2)[/tex]

Next, calculate the final energy stored in the capacitor when it has lost 20% of its initial energy:

Ef = 0.8Ei

Using the equation for power, we can find the current in the circuit:

[tex]P = IV = V^2/R[/tex]

I = V/R

We can use the formula for the rate of change of energy to find the time taken to lose 20% of the initial energy:

dE/dt [tex]= -P = -(V^2/R)[/tex]

dt/dE = [tex]-R/(V^2)[/tex]

t = -R/(V^2) * ∫ (Ei-Ef) dE

Substituting the values from steps 1-4, we can solve for the time taken:

t = -45/([tex]V^2[/tex]) * ∫ (0.8(1/2)([tex]80\times 10^{-6}[/tex])(V^2) - 0) dE

t = -45/([tex]V^2[/tex]) * [0.8(1/2)([tex]80\times 10^{-6}[/tex])V^2]

t = 0.00000144/R seconds

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Answer:

Friction plays a crucial role in the operation of a bicycle, both in terms of its performance and maintenance. Here are some ways that friction affects moving parts on a bicycle and ways to reduce or increase friction:

Friction in the chain: The chain is one of the most critical components of a bicycle, and friction can cause significant wear and tear on it. Lubricating the chain regularly can help reduce friction and prolong its lifespan.

Friction in the brakes: The brake pads are designed to increase friction on the wheel rims to slow the bike down or bring it to a stop. Over time, the brake pads wear down, reducing their effectiveness. Replacing the pads regularly can help ensure the brakes work correctly.

Friction in the bearings: Bearings help reduce friction and keep the wheels spinning smoothly. However, if they are not adequately lubricated or are worn out, they can create significant friction. Keeping the bearings clean and lubricated is essential for reducing friction and ensuring the bike runs smoothly.

Friction in the tires: The tire pressure and the surface of the road can affect the level of friction between the tires and the ground. If the tire pressure is too low or too high, it can cause uneven wear on the tire and reduce traction. It is essential to keep the tires inflated to the recommended pressure for optimal performance.

Friction in the pedals: The pedals are where the rider applies force to move the bike forward. If the pedals are not lubricated, they can create friction and reduce the rider's efficiency. Regularly cleaning and lubricating the pedals can help reduce friction and increase the rider's power.

In summary, maintaining a bicycle involves reducing friction in some areas and increasing it in others. Regular cleaning, lubrication, and replacement of worn-out parts can help keep a bicycle running smoothly and safely

Explanation:

The correct matches are Production line - Televisions, Continuous flow - Flu vaccines, Custom - Kitchen cabinets, Fixed - Submarines.

1. Production line: A production line is a manufacturing process that involves a series of workstations where individual operations are performed to create a final product. Each workstation is responsible for a specific task, and the product moves from one station to another until it is completed. The production line is used for mass production of standardized products, and it is characterized by a high level of automation and a high production rate.

2. Continuous flow: Continuous flow is a manufacturing process where raw materials or components are continuously fed into the production process, and the finished product is continuously outputted without interruption. This process is used for products that are made in large quantities and have a high demand. The continuous flow process is characterized by a high degree of automation and a low level of labor involvement.

3. Custom: Custom manufacturing is a production process where products are made to meet the specific needs and requirements of individual customers. This process involves the customization of products based on the customer's specifications, and it is characterized by a high level of flexibility and customization. The custom manufacturing process is often used for products that require a high degree of customization, such as furniture or clothing.

4. Fixed: Fixed manufacturing is a production process where products are made using a fixed set of specifications and processes. The fixed manufacturing process is characterized by a low level of customization and a high degree of repeatability. This process is often used for products that require a standardized manufacturing process, such as electronic components or automotive parts.

Therefore, The correct Answers are Production line - Televisions, Continuous flow - Flu vaccines, Custom - Kitchen cabinets, Fixed - Submarines.

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