An instructor conducted an experiment to determine the effects of two different methods of study on the amount students learned in introductory physics. The results showed that the average amount learned by the group using one method was greater than the average amount learned by the group using the other. However, the difference was not statistically significant. Which of the following is the most appropriate conclusion to be drawn?.

Water flows through a pipe at 14cfs. At a point where the pipe diameter is 18in. the pressure is 30 psi; at a second point, further along the flow path and 2 ft lower than the first, the diameter is 9in. and the pressure is 18psi then the pipe friction head loss between the two points is 147.3 ft.

To find the pipe friction head loss between the two points, we can use the Bernoulli's equation along with the conservation of mass.

The first step is to find the velocity of water at the two points using the equation of continuity:

A1V1 = A2V2

(18/12)^2 * π/4 * V1 = (9/12)^2 * π/4 * V2

V2 = 4V1

where A1 and A2 are the cross-sectional areas of the pipe at the two points, and V1 and V2 are the velocities of water at the two points.

Next, we can apply the Bernoulli's equation between the two points:

P1/ρ + V1^2/2g + h1 = P2/ρ + V2^2/2g + h2 + hL

Substituting the given values, we get:

30/ρ + V1^2/2g = 18/ρ + 16V1^2/2g + (-2)

Simplifying and solving for hL, we get:

hL = 147.3 ft

Therefore, the pipe friction head loss between the two points is 147.3 ft.

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Answer:

c human have eukaryotic cell

Human beings have eukaryotic cells. So, the correct option is (C).

Eukaryotic cells are defined as having a nucleus enclosed within a nuclear membrane and make up large and complex organelles. Protozoa, fungi, plants and animals all contain eukaryotic cells which are classified under the kingdom Eukaryota.

These can maintain different environments in the same cell which allows them to carry out different metabolic reactions which helps them to be many times larger than prokaryotic cells.

Some characteristics of these cells are:

Thus, Human beings have eukaryotic cells. So, the correct option is (C).

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Answer:

The first law states that an object at rest will stay at rest, and an object in motion will stay in motion unless acted on by a net external force. Mathematically, this is equivalent to saying that if The second law states that the rate of change of momentum of a body over time is directly proportional to the force applied, and occurs in the same direction as the applied force. the net force on an object is zero, then the velocity of the object is constant. The third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal in magnitude and opposite in direction

Explanation:

The average speed of the bus is 60 km/hr.

To find the average speed of the bus, we can use the formula:

Average speed = total distance traveled / total time taken

The total distance traveled by the bus is 80 km + 40 km = 120 km, which is given in the problem statement.

The total time taken by the bus is also given as 2 hours.

Therefore, the average speed of the bus can be calculated as:

Average speed = total distance traveled / total time taken

= 120 km / 2 hours

= 60 km/hr

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Answer:

The Northern flowing stream will affect the coast of Europe by  making  climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current

Explanation:

The Northern flowing stream will affect the coast of Europe because the North Atlantic current causes the Gulf stream to be split into two ( 2 ) and the Northern stream which is a warm stream crossing over to Northern Europe. The Gulf stream makes climate of Western Europe and Northern Europe to be warmer than other areas that are located around the same latitude and this is simply because of the North Atlantic Current

The kinematics to find the time to go from the office to the living room is: 2.81 s

Given Parameters

To find

Kinematics allows us to find the relationships between the position, velocity and acceleration of bodies, let's use the relationship  

             x = v₀ t + ½ a t²

Where x is the position, v₀ the initial velocity, at acceleration and t the time

In this case, as he leaves the office, the initial velocity is zero.

           x = ½ a t²

            t = \(\sqrt{\frac{2x}{a} }\)

Let's calculate

           t = \(\sqrt{\frac{2 \ 125}{4} }\)

          t = 2.81 s

In conclusion, using the kinematics, we find that the time to go from the office to the classroom is: 2.81 s

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Answer: 4K1

Explanation:

Mechanical, chemical, electrical, electromagnetic, thermal, acoustic, and radioactive energy are examples of different types of energy.

To avoid energetic connection with other individuals, there may be some compacting—holding back—of energy in the heart centre, and the energy field begins to divide during the early stages of death. The bottom three bodies (energy field layers) separate and disintegrate.

According to experts, energy conservation does not equate to energy savings. Energy is neither generated nor destroyed, according to the rule of conservation of energy. Energy doesn't evaporate when it is used by people. Energy may transform from one kind of energy into another.

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Forms of energy include mechanical, chemical, electrical, electromagnetic, thermal, sound, and nuclear energy.

Chemical energy is the power stored in the bonds between atoms and molecules. Things like batteries, biomass, oil, natural gas, and coal all contain chemical energy. Chemical energy is converted into thermal energy, for example, when people burn wood in a fireplace or gasoline in a car's engine.

Tension in objects is a form of mechanical energy. Rubber bands that have been stretched and compressed are two examples of mechanical energy that has been stored.

The energy that an atom's nucleus stores and uses to preserve its structural integrity is known as nuclear energy. Significant amounts of energy may be released during the joining or splitting of the nuclei.

Electrical energy is produced by tiny charged particles called electrons, which typically move along a wire. a specific instance of electrical energy in nature is lightning.

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A spring of force constant 120 N/m acted up by a constant force of 240N. Then, the elastic potential energy stored in the spring is 240 Nm.

The elastic potential energy stored in the spring is formulated as follows

                                                 PE = ½kx²

Where PE is the elastic potential energy, x is the displacement of the spring from its equilibrium position, and k is the spring force constant.

In this question, the spring force constant is 120 N/m, and the constant force acting on the spring is 240 N. To find the spring displacement, we can use the formula:

F = kx

Where F is the force acting on the spring, x is the displacement, and k is the force constant,

So that:

F = kx

240 N = 120 N/m . x

x = 240 N/120 N/m

x = 2 m

Once x is known, then we can calculate the potential energy of the spring:

PE = ½kx²

PE = ½ (120) (2²)

PE = 60 x 40

PE = 240 Nm

So, the elastic potential energy stored in the spring is 240 Nm.

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490 N is the magnitude of the centripetal force of rider at the top of the circle.

Simply said, "distance or amount" is the definition of magnitude. In terms of motion, it shows the absolute or relative size, direction, or movement of an item. It is used to describe something's size or scope. Magnitude in physics often refers to a size or amount.

If the rider weighs 50 kg, then the centripetal force needed to keep him or her moving in a circle must be equal to that weight,

or

Fc=mg=509.8

N=490 N.

The way a body's orientation or position varies across time. Translation is the activity of movement along a line or curve. Rotation is the term that refers to motion that modifies a body's orientation.

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Answer:

13

Explanation:

Brainlest pls

Answer:

B-13

Explanation:

The protons listed in the atom are 13, and the protons are the same number as the atomic number.

The Doppler method can measure the eccentricity of orbit, semimajor axis of orbit, lower limit mass, and orbital period of exoplanets.

Eccentricity of orbit: The Doppler method can provide information about the eccentricity of a planet's orbit by detecting the periodic variations in the star's radial velocity caused by the planet's gravitational pull.

Semimajor axis of orbit: The Doppler method allows for the determination of the semimajor axis of a planet's orbit. By measuring the periodic changes in the star's radial velocity, scientists can infer the distance between the star and the planet, which corresponds to the semimajor axis.

Lower limit mass: The Doppler method can provide a lower limit estimate of a planet's mass. By observing the periodic variations in the star's radial velocity, scientists can calculate the minimum mass of the planet based on the gravitational influence it exerts on the star.

Orbital period: The Doppler method is particularly effective in determining the orbital period of a planet. By measuring the time it takes for the periodic changes in the star's radial velocity to repeat, scientists can accurately determine the planet's orbital period.

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Answer:

The force of the finger causes the books to accelerate and fall.

Explanation:

Answer:

Explanation:

1.) A line of dominos is knocked down. Which explanation is true?

ANSWER: An increase in force caused an increase in acceleration.

2.) When raindrops form, the force of gravity pulls them toward the ground. Which statement is correct about this chain of events?

ANSWER: The force of gravity causes the raindrops to accelerate.

3.) A student observes that for the same net force, heavier objects accelerate less. Which statement describes a correct conclusion?

ANSWER: There is a negative correlation between mass and acceleration.

There is a negative correlation between mass and acceleration.

4.) A nonzero net force acts on a moving ball, and the ball comes to a stop. Which statement is correct about the relationship between the net force and the ball's movement?

ANSWER: The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.

5.) A student places five books next to each other on their ends. She then pushes the first book with her finger, and a few seconds later, the last book falls. Which statement is correct about this chain of events?

ANSWER: The force of the finger causes the books to accelerate and fall.

I hope this helps <33

The activity that is not part of sustainable development is option 3, where forests are cut down and new trees regrow to replace them. This is because it takes several years for new trees to grow, and the rate at which they are being cut down is much higher than the rate at which they are being replaced.

This can lead to deforestation, which can cause soil erosion, water pollution, and loss of biodiversity.
On the other hand, options 1, 2, and 4 are sustainable activities as they focus on conserving resources and reducing environmental impact.

Limited harvesting of fish ensures that their populations are not depleted, while replacing water in the Great Lakes ensures that the ecosystem remains balanced. Solar energy is a renewable source of energy that does not produce harmful emissions and reduces the dependence on non-renewable sources like coal and oil.

In conclusion, sustainable activities focus on using resources in a responsible and efficient manner, ensuring that they are not depleted and do not cause harm to the environment. It is essential to adopt sustainable practices to ensure the long-term health and well-being of our planet.

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Answer:

To determine the focal length of the corrective lenses required, we can use the lens formula:

1/f = 1/do + 1/di

where f is the focal length of the lens, do is the object distance (the distance from the object to the lens), and di is the image distance (the distance from the lens to the image).

In this case, the object distance is 32.0 cm (the distance from the man's eyes to the book), and the image distance is the distance from the lens to the man's eyes, which is 2.0 cm. We want to find the focal length, so we can rearrange the equation to solve for f:

1/f = 1/do + 1/di

1/f = 1/32.0 cm + 1/2.0 cm

1/f = 0.03125 cm^-1 + 0.5 cm^-1

1/f = 0.53125 cm^-1

f = 1.881 cm

Therefore, the required focal length of the corrective lenses is approximately 1.881 cm.

Answer:

1.212447π

Explanation:

To determine the focal length we use the formula

1/f=1/v-1/u
Here U is 145 cmand v is 32cm

therefore we use pythagorus theorem

AC^2=AB^2+BC^2

then we use reciprocal of circle

=1.212447π (use 3.14 or 22/7)

The correct tight asymptotic bound for T(n) in 1, 2, 3 where T(1)=c is Θ(n log n).

To find the tight asymptotic bound of T(n), we will use the Master Theorem. So, let's take a look at each recurrence relation:

1. T(n) = 10T(n/10)+100nApplying the Master Theorem: a = 10, b = 10, f(n) = 100nlogb a = log10 10 = 1 Since f(n) = Θ(n) = Θ(n1), Case 2 of the Master Theorem applies. The solution, therefore, is Θ(n log n).

2. T(n) = T(n/10)+100n Here, a = 1, b = 10, f(n) = 100nlogb a = log10 1 = 0 Since f(n) = Θ(n0) = Θ(1), Case 1 of the Master Theorem applies. The solution, therefore, is Θ(n).

3. T(n) = T(n/10)+100 Here, a = 1, b = 10, f(n) = 100logb a = log10 1 = 0 Since f(n) = Θ(1) = Θ(n0), Case 2 of the Master Theorem applies. The solution, therefore, is Θ(log n).Therefore, the correct tight asymptotic bound for T(n) in 1, 2, 3 where T(1)=c is Θ(n log n).

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Let's use the Master Theorem to find the asymptotic tight bound for each of the three recurrence relations given in the problem statement.

1. T(n) = 10T(n/10) + 100n Here, a = 10, b = 10, and f(n) = 100n. We can calculate the value of logb a as follows: log10 10 = 1 Since f(n) = Θ(n1), we can apply Case 2 of the Master Theorem and get: T(n) = Θ(n log n)Therefore, the correct tight asymptotic bound for T(n) in the first case is Θ(n log n).

2. T(n) = T(n/10) + 100n Here, a = 1, b = 10, and f(n) = 100n. We can calculate the value of logb a as follows: log10 1 = 0 Since f(n) = Θ(n1), we can apply Case 1 of the Master Theorem and get: T(n) = Θ(n)Therefore, the correct tight asymptotic bound for T(n) in the second case is Θ(n).

3. T(n) = T(n/10) + 100 Here, a = 1, b = 10, and f(n) = 100. We can calculate the value of logb a as follows: log10 1 = 0 Since f(n) = Θ(1), we can apply Case 2 of the Master Theorem and get: T(n) = Θ(log n) Therefore, the correct tight asymptotic bound for T(n) in the third case is Θ(log n). Hence, the three asymptotic tight bounds for T(n) are Θ(n log n), Θ(n), and Θ(log n), respectively.

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Answer:b

Explanation:

A material yields or flows when under stresses greater than its elastic limit. For such materials, the elastic limit signifies the transition from elastic to plastic behavior.

Stresses above the elastic limit cause fracture in the majority of brittle materials with almost minimal plastic deformation.

What is plastic behavior?

A material displays plastic behaviour under forces that exceed the elastic limit. This means that even after the load has been removed, the material has irreversibly changed shape and size. The material deforms plastically as the tension is gradually increased past the elastic limit.

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12 x cos 50 = 7.713451316...

Answer:

initial velocity(u)=0

time(t)=3.5sec

acceleration (a)=9.8m/s²

final velocity (v)=?

Explanation:

we have

v=u+at=0+9.8×3.5=34.3m/s

Answer:

Compounds are two or more elements chemically combined in definite proportions by weight.

Mixtures are two or more substances not chemically combined.

Explanation:

Hope this helped Mark BRAINLIEST!!!

Answer:

A mixture can be separated by physical means

Explanation:

Explanation:

The unit of volume derived from SI units(1) is the cubic meter, m3.

Chemists in a laboratory usually deal with much smaller volumes than cubic meters and the metric but non-SI units of liter or litre (L) and milliliter or millilitre (mL or ml) are in common use.

In 1964 the litre was redefined as being equal to exactly 1 cubic decimetre:

1 L = 1 dm3

So 1 milliltre = 1 cubic centimetre

1 mL = 1 cm3 (= 1cc)

Other metric units of measuring volume are given in the table below:

large volume → → → → → → → → → → small volume

name teralitre gigalitre megalitre kilolitre hectolitre decalitre decilitre centilitre millilitre microlitre nanolitre picolitre femtolitre attolitre

symbol TL GL ML kL hL daL dL cL mL µL nL pL fL aL

volume (L) 1012 L 109 L 106 L 103 L 102 L 101 L 10-1 L 10-2 L 10-3 L 10-6 L 10-9 L 10-12 L

Boiler monitor: Over the following three chapters, we will create an app that monitors the temperature and pressure of a boiler. To navigate between the pages, we can use a navigation bar at the top of the app, which will have links to each page. We can also use buttons or links within each page to navigate to other pages.

The following pages

1. Home page - This page will display the title of the app and a brief description. It will also have links to navigate to other pages.

2. Temperature page - This page will display the current temperature of the boiler and a graph showing the temperature over time. It will also have a button to refresh the temperature reading.

3. Pressure page - This page will display the current pressure of the boiler and a graph showing the pressure over time. It will also have a button to refresh the pressure reading.

4. Settings page - This page will allow the user to customize the app settings, such as the temperature and pressure units, and the frequency of data updates.

To navigate between the pages, we can use a navigation bar at the top of the app, which will have links to each page. We can also use buttons or links within each page to navigate to other pages.

In the next chapters, we will add functionality to the temperature and pressure pages to display real-time data from the boiler, and we will implement the settings page to allow the user to customize the app.

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Given,

The mass is m=1200kg

Height is h=14 m

Power is P=9kW

We know

Energy per unit time is power.

Thus,

P=mgh/t

where t is the time.

Thus,

The time is 18.312 sec.