when scientists publish experimental results their results are often criticized by other scientists how is this process a source of strength of Science? It encourages scientists to give convincing evidence for the results
it allows scientists to keep their data secret
a scientific model is not used full unless everyone thinks it's true
or if forces scientists to publish results that are in line with current theories ​

A bookshelf is 2m long, with support at it end (P and Q). Don't consider the weight of the bookshelf. The book is moved to that it is 50cm from Q. The force at P is W/3 and Q is 2W/3.

The force at points P and Q using the concept of moments, you need to know the weight of the bookshelf and the location of the book on the shelf. The moment of a force about a point is equal to the force multiplied by the distance from the point to the line of action of the force. The line of action of a force is the straight line through which the force acts. In this case, let's assume that the weight of the bookshelf is W and the location of the book is x meters from Q. The forces at points P and Q can be found using the following equations:

Moment at P = (W - F) x x

Moment at Q = F x (2 - x)

Where F is the force exerted by the book on the shelf.

Solving these equations for F and substituting the given values gives:

= F = W x (2 - x) / (2 - x + x)

= W x 2 / 3

The force at point P is equal to the weight of the bookshelf minus the force exerted by the book, which is:

= F at P = W - F

= W - W x 2 / 3

= W / 3

The force at point Q is equal to the force exerted by the book, which is:

= F at Q = F

= W x 2 / 3

So, if the weight of the bookshelf is W and the book is 50 cm from Q (which is equal to 0.5 meters), the force at point P is W / 3 and the force at point Q is 2W / 3.

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Example of an elastic product: Smartphone

Explanation: A smartphone is an example of an elastic product. When the price of smartphones decreases, consumers tend to buy more of them, and when the price increases, consumers tend to buy fewer.

Example of an inelastic product: Prescription medication

Explanation: Prescription medication is an example of an inelastic product. Inelastic goods are those for which changes in price have little impact on the quantity demanded.

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Answer:

'Wave' is a common term for a number of different ways in which energy is transferred: In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

Answer:

391.5 J

Explanation:

The amount of work done can be calculated using the formula:

Looking at the formula, we can see that the mass of the object does not affect the work done on it.

Substitute the force applied and the displacement of the object into the equation.

The amount of work done on the object is 391.5 J in order to move it 4.5 meters with an applied force of 87 Newtons.

Mass doesn't matter on amount of work done .We can calculate amount of work done through Force and Displacement

\(\boxed{\sf W=Fd}\)

\(\\ \sf\longmapsto Work\:Done=87(4.5)\)

\(\\ \sf\longmapsto Work\:done=391.5J\)

The corresponding range of temperatures in Fahrenheit is 97.52 °F and 99.32 °F

To express the range in Fahrenheit, we shall convert 36.4 °C and 37.4 °C to degree Fahrenheit. Details below:

For 36.4 °C

°F = (°C × 9/5) + 32

= (36.4 × 9/5) + 32

= 97.52 °F

For 37.4 °C

°F = (°C × 9/5) + 32

= (37.4 × 9/5) + 32

= 99.32 °F

Thus, the range of the temperature in Fahrenheit is 97.52 °F and 99.32 °F

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Answer:

See below

Explanation:

No energy has been added to the system to make it swing higher than from where it was released....actually....some energy has been LOST in the system due to air friction, so the balloon will not swing QUITE as high as from where it was released.

An electrically charged object can be used to attract any object with an opposite charge.

This is due to the fundamental principle that opposites attract and repel in physics.

Electric charge is a fundamental property of matter that gives rise to electromagnetic interactions. An electric charge, whether positive or negative, produces an electric field that surrounds it. This field exerts a force on any other charge in its vicinity that is either attracted to or repelled from it. Electric charge is a fundamental property of matter that produces a variety of electric phenomena. When the charge is concentrated in a localized region of space, the object is electrically charged. When there is a net accumulation of charge in an object, it becomes electrically charged. An electrically charged object produces an electric field in its vicinity, which exerts a force on other charged objects. An electrically charged object can be used to attract objects with an opposite charge or repel objects with the same charge.

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Answer:

9 is the number of protons in the fluorine atom (atomic number)

Explanation:

Answer:

Atomic number

Explanation:

R(F) = 4F - 160

a. R¹(P) represents the temperature at which a cricket chirps at a rate of P chirps per minute.

b. R(60) refers to the chirping rate of the cricket when the temperature is 60 degrees Fahrenheit, while R¹(60) represents the temperature at which the cricket chirps at a rate of 60 chirps per minute.

The equation R(F) = 4F - 160 represents the relationship between the temperature of the cricket's environment (F) and its chirping rate (R). By plugging in different temperature values, we can determine the corresponding chirping rate.

For example, when we calculate R(60), we find the chirping rate at 60 degrees Fahrenheit.

In this case, R(60) = 4(60) - 160 = 240 - 160 = 80 chirps per minute.

On the other hand, when we calculate R¹(60), we are looking for the temperature at which the cricket chirps at a rate of 60 chirps per minute. Solving the equation 60 = 4F - 160, we find F = 70 degrees Fahrenheit. Therefore, R¹(60) = 70.

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Answer:

\(a = \frac{v_{f} - v_{i}}{t} \\ = \frac{77 - 5}{8} = \frac{72}{8} \\ \boxed{a = 9 \: m. {sec}^{ - 2} }\)

Option C is correct. It has a high frequency. Wavelength is inversly proportional to the frequency. For short-wavelength, the frequency will be high.

Frequency and wavelength have an inverse connection with one another. As a result, the wave with a high frequency should have a short wavelength.

For short-wavelength, the frequency will be high.

Hence Option C is correct. It has a high frequency.

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Answer:

c <33

Explanation:

Answer:

30m

Explanation:

Given parameters:

Speed of the goat  = 1.5m/s

Time  = 20s

Unknown:

Distance traveled  = ?

Solution:

To solve this problem, we use;

      Speed  = \(\frac{distance}{time}\)  

 Distance = Speed x time

 So;

 Distance  = 1.5m/s x 20s  = 30m

Answer: 0.28 A

Explanation:

Based on the graph, it appears that the species most likely to be affected if the water temperature increases from 74°F to 80°F would be the rainbow trout.

It is because the graph shows that rainbow trout have a much narrower range of temperature tolerance compared to the other species listed, such as bass and catfish. While bass and catfish can tolerate temperatures up to 90°F, rainbow trout can only tolerate temperatures up to around 68°F.

As the water temperature increases beyond 68°F, the health and survival of rainbow trout are likely to be negatively impacted, making them more vulnerable to the effects of increasing water temperature. Therefore, if the water temperature were to increase from 74°F to 80°F, it would be expected to have a significant impact on the population of rainbow trout in the ecosystem.

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Answer:

Explanation:

(4.8 m/s)t = 1/2(2.2 m/s²)t²

2(4.8 m/s)t / (2.2 m/s²) = t²

2(4.8 m/s) / (2.2 m/s²) = t²/t

t = 4.36 s

A.  total time it takes to catch up to friend = 4.36s + 2s = 6.36s    (took her 2 sec to hop on the bike and get going)

B. Distance she travels is the same distance the friend travels in 4.36 s = (4.8 m/s)(4.36 s) = 1/2(2.2 m/s²)(4.36 s)² = 20.9 m

Answer:

sem definitely this question read this book please .

Answer:

Answer is in attached photo.

Explanation:

Solution is in the attached photo, do take note that this question requires multiple formulas, such as Power and Work Done, which are:

1) Work Done =

Force x Distance or F x D

2) Power =

\(\frac{Work \ Done }{Time}\)

Answer:

No work is done since no distance is given

Explanation:

Since no distance is given, the force is not doing any work

No work is done by the man since we do not know the distance or displacement.

Work is only said to be done when the force applied on an object moves it through a particular distance.

Work done  = Force x distance.

Since no distance is given in this problem, we can as well assume that the force applied is doing no work on the object.

There must be a rigid dedication of time to aerobic exercise so as to be able to maintain fitness goals.

The term fitness has to do with the ability of a person to be able to carry out his or her activities without getting tired or fatigued. We know that a person is said to be fit if the person has sufficient energy to carry out the activities that the person ought to carry out in a day.

It is common that after graduation, the encumbrances of work and a thriving career would stop a lot of persons from the pursuit of personal fitness goals.

It is therefore vital that a person ought to develop an effective plan of how to retain fitness even after a person has graduated from school. A key way to ensure that fitness is maintained to have a rigid schedule of aerobic exercises. There should be at least three days in a week that are marked out for not less than an hour of aerobic exercise.

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To calculate the IV (intravenous) flow rate for an LVP (large volume parenteral) infusion, a technician must know the total volume of the LVP and either the infusion time or the desired infusion rate.

1. Infusion Time: If the technician knows the total volume of the LVP and the desired infusion time, they can use the formula:

Flow Rate (mL/h) = Total Volume (mL) / Infusion Time (hours)

This formula will give the flow rate required to infuse the entire volume of the LVP over the specified infusion time.

2. Infusion Rate: If the technician knows the total volume of the LVP and the desired infusion rate, they can use the formula:

Flow Rate (mL/h) = Infusion Rate (mL/h)

In this case, the infusion rate is already provided, and it represents the desired flow rate at which the LVP should be administered.

Both of these formulas assume a constant flow rate throughout the infusion process. It's important to note that the actual flow rate might vary slightly due to factors such as line resistance, gravity, or specific equipment used. Therefore, close monitoring of the infusion process is necessary to ensure accurate delivery of the LVP.

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When facing a wind blowing from the west to the east, an airplane intending to fly directly north should be pointed slightly to the west of north. This compensates for the crosswind force and allows the aircraft to maintain its desired northward heading.

If an airplane needs to fly to a point directly north of its location and there is a wind blowing from the west to the east, the pilot should point the plane slightly to the west of north. This adjustment is necessary due to the effect of the wind on the airplane's path.

The wind creates a force known as the crosswind, which acts perpendicular to the direction of the airplane's intended path. In this case, the crosswind pushes the airplane to the east. To counteract this force and maintain a northward trajectory, the pilot must point the plane slightly to the west.

By pointing the plane to the west, the pilot allows the wind to push the aircraft sideways, compensating for the eastward force caused by the wind. This technique is known as "crabbing" or "yawing into the wind." It ensures that the airplane's actual flight path remains aligned with the intended northward direction.

The amount of adjustment required depends on the strength and direction of the wind. Pilots use their training and experience, along with information from weather reports and aircraft instruments, to determine the appropriate angle to point the plane relative to the wind.

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Answer:

C

Explanation:

you cannot any other thing if you don't even know what you are designing.

The first step in the technological design process is to define a need or problem, therefore the correct answer is option C.

There are mainly five stages of technological design,

Identifying the issue that needs to be solved is the first step in every problem-solving process.

The second stage is to imagine; during this phase,

The chosen product from the imaging stage is planned in the third stage.

Testing, evaluating, and modifying the product are the fourth stage.

The sharing of your solution is the fifth step. To gather comments, discuss your ideas with others, and enhance your product,

Technological designing is a lengthy process that involves a number of steps but identifying the problem we are going to is the most important step among all of the steps because a wrong approach to the problem would lead to faulty design in the later stages.

Thus, the first step in the technological design process is to define a need or problem, therefore the correct answer is option C.

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Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

To find the x and y coordinates of the center of mass for the system of these three objects, we need to calculate the weighted average of the x and y coordinates of each individual object.

First, let's label the objects:
- Pipe wrench: mass = 2.3 kg
- Hatchet: mass = 1.5 kg
- Hammer: mass = 1.0 kg

Next, let's denote the x and y coordinates of each object's center of mass on the graph:
- Pipe wrench: (x1, y1)
- Hatchet: (x2, y2)
- Hammer: (x3, y3)

To calculate the x coordinate of the center of mass (x_cm), we use the formula:
x_cm = (m1*x1 + m2*x2 + m3*x3) / (m1 + m2 + m3)

Substituting the given values, we get:
x_cm = (2.3*x1 + 1.5*x2 + 1.0*x3) / (2.3 + 1.5 + 1.0)

Similarly, to calculate the y coordinate of the center of mass (y_cm), we use the formula:
y_cm = (m1*y1 + m2*y2 + m3*y3) / (m1 + m2 + m3)

Substituting the given values, we get:
y_cm = (2.3*y1 + 1.5*y2 + 1.0*y3) / (2.3 + 1.5 + 1.0)

By plugging in the specific x and y coordinates for each object, you can calculate the x_cm and y_cm values for the system of these three objects.

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A point source of light illuminating an aperture is 2 mm away. A 13 cm wide bright patch of light appears on a screen 2 mm behind the aperture. The width of the aperture is 6.5 cm.

The formula for determining the width of the aperture is given by

D = f/N

where, D is diameter

f is focal length

N is f-number or wideness

DN = f

N = f/D

Given that, f = 13 cm = 130 mm

D = 2 mm

N = 130/2 = 65 mm = 6.5 cm

Thus, the width of the aperture is 6.5 cm.

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The frequency of System 1 is highest, followed by System 2, and finally System 3.

The equation: gives the frequency of an oscillating system.

f = (1 / 2π) * √(k / m)

When the mass is m, the spring constant is k, and the frequency is f.

Each mass is dragged down an additional 1 cm before being released, so the oscillation amplitude is the same for all of the masses.

The square root of the spring constant is directly proportional to an oscillating system's frequency, while the square root of the mass is inversely proportional.

As a result, the system with the greatest frequency also has the largest spring constant and lowest mass.

We shall compare the masses since, based on the available data, we are unable to tell which system has the largest spring constant.

m1 Equals 0.5 kg in System 1.

System 2: 0.8 kg/m2

System 3: 1.2 kg/m3

We can determine the frequencies of each system using the frequency formula:

f1 = (1 / 2)*(k / m1), f2*(k / m2)*(k / m3), and f3*(1 / 2)*(k / m3)

We can compare the frequencies by looking at the mass terms because the spring constant is the same for all three systems:

F1 = 1/M1 = 1/0.5 = 1.414 F2 = 1/M2 = 1/M8 = 1.118 F3 = 1/M3 = 1/M2 = 1/M3 = 0.912

System 1 therefore operates at the greatest frequency, followed by systems 2 and 3.

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(a) The instantaneous source voltage can be determined by using the given magnitude and phase angle. Since the phase angle is 0°, the instantaneous source voltage can be written as:

V(t) = 277 * cos(2π * 60 * t)

(b) For a 30-Ω resistor, the current entering the positive terminal is the same as the source current. Since the voltage and resistance are given, we can use Ohm's law to determine the current:

I(t) = V(t) / R = (277 * cos(2π * 60 * t)) / 30

(c) For a 15-mH inductor, the phasor current can be determined using the formula:

I = V / jωL

where j is the imaginary unit (√(-1)), ω is the angular frequency (2π * frequency), and L is the inductance. In this case, ω = 2π * 60 and L = 15 * 10^(-3):

I = (277 ∠0°) / (j * 2π * 60 * 15 * 10^(-3))

To find the instantaneous current, we can take the real part of the phasor current and then convert it to the time-domain using cosine function:

I(t) = Re(I * e^(jωt))

(d) For a capacitor with 100 mF, the phasor current can be determined using the formula:

I = jωCV

where C is the capacitance. In this case, ω = 2π * 60 and C = 100 * 10^(-3):

I = (j * 2π * 60 * 100 * 10^(-3)) * 277 ∠0°

To find the instantaneous current, we can take the imaginary part of the phasor current and then convert it to the time-domain using sine function:

I(t) = Im(I * e^(jωt))