18. scientists measured the beak length of a population of birds in a lake in 1960. they measured the beak length of the bird population again in 2010. what do the graphs show you about the variation in the beak lengths of the birds by the lake?

The magnitude of the net force on the couch will be equal to 30 N.

Force acting on an object can be defined as the effect that changes the state of the body of motion or rest. The force's SI unit is Newton and force is a vector parameter.

The force can be determined from the product of the mass (m) and acceleration (a).

F = ma

Given, the mass of the couch, m = 20 Kg

The couch is accelerating, a = 1.5 m/s²

According to Newton’s second law of motion, the magnitude of the net force on the couch can be calculated as:

F = ma = 20 ×1.5

F = 30 N

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All of the true statements that describe acceleration include the following:

A. Negative acceleration occurs when an object slows down in the positive direction.

C. Negative acceleration occurs when an object speeds up in the negative direction.

D. Positive acceleration occurs when an object speeds up in the positive direction.

F. Positive acceleration occurs when an object slows down in the negative direction.

In Science, an acceleration can be defined as the rate of change of the velocity of a physical object or body with respect to time.

Mathematically, the acceleration of a physical object or body can be calculated by using this formula:

a = (V - U)/t

Where:  

Generally speaking, a physical object would experience positive acceleration when it either speeds up in the positive direction or slows down in the negative direction.

On the other hand (conversely), a physical object would experience negative acceleration when it either speeds up in the negative direction or slows down in the positive direction.

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A specific spot on a tectonic plate border is represented by Point A.

what is tectonic plate border ?

An enormous slab of solid rock with an uneven form known as a tectonic plate is often made up of both continental and oceanic lithosphere rocks. Tectonic plates can be anything from a few hundred and a few thousand kilometres across in size. Among the biggest plates on the earth are the Pacific and Antarctic Plates.

Numerous smaller or less significant tectonic plates are also present. Despite being smaller, the minor plates play a smaller role in forming the earth's surface characteristics. The tectonic plates move like a conveyor belt due to currents in the molten rocks underneath the plates. The interaction where the plates meet or split is where the majority of geologic activity occurs. The plates barely shift a few millimetres annually, though.

A specific spot on a tectonic plate border is represented by Point A. Major tectonic plates are represented by plates X and Y. Labeling has been done for the Hellenic Trench, the minor tectonic plate Anatolian Plate, and the island of Crete. The relative directions of plate motion are shown by arrows.

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The final temperature of the mixture is 17.9 °C.

The final temperature of the mixture can be found using the formula for heat exchange between two bodies at different temperatures: Q = mcΔT, where Q is the heat exchanged, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

For the tea, Q = mcΔT = (4.18 J/g·°C)(1.50 L)(1000 g/L)(75.0 - T)

For the ice, Q = mcΔT = (2.09 J/g·°C)(0.975 kg)(0 - T)

Since the total heat in the system is conserved, the heat gained by the tea is equal to the heat lost by the ice. So, we can set the two equations equal to each other and solve for T.

(4.18 J/g·°C)(1.50 L)(1000 g/L)(75.0 - T) = (2.09 J/g·°C)(0.975 kg)(0 - T)

T = (75.0 - (2.09 J/g·°C)(0.975 kg)/(4.18 J/g·°C)(1.50 L)(1000 g/L)) = 17.9 °C

So, the final temperature of the mixture is 17.9 °C.

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Furthermore, according to Newton's Second Law, the force required to accelerate an object increases with its mass.

When a ball is struck, it accelerates to a certain degree. The force exerted on the ball immediately correlates to the acceleration with which it moves. Consequently, Newton's second rule of motion is demonstrated in real life by the fact that the ball moves quicker the harder you strike it.

A force exerted on an object causes it to accelerate in accordance with Newton's Second Law of Motion, commonly referred to as the Law of Force and Acceleration or the Law of Force and Mass.

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The compression of the spring of spring constant 384 N/m is 2.41 m.

Compression springs work by resisting and pushing back against any downward or inward force that tries to squash and hold them in a compressed state.

To calculate the compression of the spring, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the compression of the spring is 2.41 m.

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Answer:

[tex]\huge\boxed{\sf v = 2.7\ m/s}[/tex]

Explanation:

Radius = r = 1.14 m

Angular velocity = ω = 2.38 rad/s

Linear velocity = v = ?

v = rω

v = (1.14)(2.38)

[tex]\rule[225]{225}{2}[/tex]

L1/k1A + L2/k2A is the total thermal resistance between the surfaces at temperatures T0 and TL.

A measurement of the temperature differential at which a material or item resists the transfer of heat is known as thermal resistance. Thermal resistance is the inverse of thermal conductivity. Since the bulk of electrical components generate heat and need cooling, thermal resistance of materials is of special interest to electronic engineers. Electronic components might malfunction or fail due to overheating, hence special care must regularly be taken while designing those components.

Engineering regularly uses another important concept. Since there is a resemblance between the dispersion of heat and electrical charge, engineers typically use the thermal resistance (i.e., thermal resistance vs heat conduction) to compute heat transport through materials. Thermal resistance is the reverse of thermal conductivity.

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The complete question is,

A composite wall is shown with surface temperatures T0 and TL. Layer L1 has conductivity K1, thickness L1 and layer 2 has conductivity k2, thickness L2. The cross-sectional area of both layers is A. The total thermal resistance between the surfaces at temperatures T0 and TL is.

Answer: 0.061gm

Explanation:

The wavelength of highest photon energy is 0.544J.

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An electron has a charge that is equal to the size of the elementary charge, e, with a negative sign. The value of the elementary charge is 1.602 x 10-19 C.

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Explanation:

Equation for resistity

[tex]p(t)= p(0) \times (1 + a \times (change \: in \: temp))[/tex]

[tex] = 0.02 \times {10}^{ - 6} \times (1 + 0.004 \times 60)[/tex]

[tex] = 2.48 \times {10}^{ - 8} ohm \: m[/tex]

[tex]r = (p \times l) \div a[/tex]

[tex] = (2.48 \times {10}^{ - 8} \times 1200) \div \: 5 \times {10}^{ - 6} [/tex]

[tex] = 5.952 \: ohms[/tex]

Which of the following is a natural resource for humans?

O Cars

O Electricity

O Houses

O Wood

Wood

Answer:

wood is a natural resources to man because it is not created by man

When the current in the wire is decreasing the oppose magnitude of the magnetic flux in the loops is decreasing.

Induced currents in the loops and the forces exerted on them are directed so they oppose this change

Magnetic flux is a size of the entire magnetic subject which passes thru a given region. it's far a useful device for helping describe the outcomes of the magnetic pressure on some thing occupying a given location.

Magnetic flux through a surface is the surface integral of the ordinary element of the magnetic subject B over that floor. it is also denoted Φ or ΦB. The SI unit of magnetic flux is the weber, and the CGS unit is the maxwell.

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Answer: position E

Explanation:

After the ball is thrown it has a negative acceleration (it's slowing down) at a rate of 9.8 m/s2 (round that to 10 m/s2), which is g, the rate of acceleration due to gravity.  The position of the ball is shown every 1 second.  At position B, the ball has a speed of 40 m/s, at C = 30 m/s, at D =  20 m/s, and at E = 10 m/s.  Every 1 second, the ball slows down by 10 m/s.  At F, the top, the instantaneous speed = 0 m/s.  Then the ball will then speed up by 10 m/s every second, until it reaches K, where the speed is back at 50 m/s.

The potential energy of the skateboarder at the top of the ramp was 1650 joule.

The law of conservation of energy asserts, in essence, that: The total energy of the system is preserved in a closed system, or a system that is separated from its surroundings.

Given that: A skateboarder with a mass of 120 kilograms (including the skateboard) is traveling at a speed of 5.00 meters per second upon reaching the bottom of a ramp.

So, his kinetic energy = 1/2×mass×speed² = 1/2 × 120 × 5² =  1500 Joule.

Loss of energy due  to friction = 150 joule.

So,  the potential energy of the skateboarder at the top of the ramp be =  1500 Joule + 150 joule = 1650 joule.

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To determine the principal stresses at points A and B, we need to consider how these forces are distributed over the surface of the volume element. The principal stresses are the stresses that act along the directions of maximum and minimum stress on the element.

To determine the principal stresses at points A and B, we need to consider the forces acting on a small volume element located at these points.

The stress on a volume element is defined as the force acting on the element per unit area. The stress components at a point can be represented by a stress tensor, which is a 3x3 matrix with nine elements. The diagonal elements of the stress tensor represent the normal stress components, while the off-diagonal elements represent the shear stress components.

In this case, we are given that the beam has a rectangular cross-section and is subjected to the loadings shown. There is a vertical force F acting on the beam at point A, as well as a horizontal force P. The beam is also subjected to a moment M about the z-axis.

To find the principal stresses, we can first calculate the normal stress components and shear stress components at the points of interest. Then, we can use the equations of mechanics to determine the principal stresses by finding the eigenvalues of the stress tensor.

To do this, we need to know the dimensions of the volume element, as well as the magnitudes of the forces and moments acting on the beam. With this information, we can use the equations of statics to solve for the stress components at points A and B, and then use the equations of mechanics to determine the principal stresses at these points.

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The temperature increase of the water is 57.1⁰C.

The temperature increase of the water is determined by calculating the change in temperature of the water.

Q = mcΔθ

where;

1 hour = 3600 seconds

The quantity of heat water transferred to the water = e x P x t

where;

( 0.2 x 5,000 x 3600 ) = 15 x 4200 x Δθ

3,600,000 = 63,000Δθ

Δθ = 3,600,000 / 63,000

Δθ = 57.1 ⁰C

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Answer: S-H bonds are typically longer than O-H bonds because sulfur is larger than oxygen. The size difference between the two atoms means that the electrons in the bond are farther apart in an S-H bond, resulting in a longer bond length. Additionally, sulfur is less electronegative than oxygen, which means that the electrons in the bond are less strongly attracted to the sulfur atom and are therefore more likely to be found in the region between the two atoms, further increasing the bond length.

Explanation:

Answer:

Describe the differences between the O-H and S-H bond lengths. Due to its stronger shielding, which lessens the nuclear pull for the bonding electrons and causes a longer bond length, sulfur is a bigger atom than oxygen.

Explanation:

Since the surface of the Sun has a curved layer of flame that represent prominence rising from the surface of the Sun, an event which is most likely to occur as a result of the prominence is: B. the auroras would become visible.

In Science, the Sun can be defined as an astronomical or celestial body that is typically found within the solar system around which planetary (astronomical) bodies orbit, and whose light shines on planet Earth to differentiate day and night.

A solar prominence is also known as filament and it can be defined as a large, bright, dense cloud of luminous ionized gas such as hydrogen, sodium calcium, etc., that erupts and extends from the surface of the Sun.

Based on astronomical records, a solar prominence can linger in the corona for a very long time, reaching hundreds of thousands of kilometers into the Sun's atmosphere (space). Consequently, this solar prominence would make the auroras (polar lights) to become visible.

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Answer:

4

Explanation:

1 is true. Speed is the magnitude of velocity so if the magnitude of velocity(speed) changes, then velocity changes itself.

2 is true.

[tex]a _{avg} = \frac{v _{f} - v _{i} }{t} [/tex]

Since speed changes, the inital and final speeds are different, therefore we will have some nonzero acceleration because the numerator does not equal zero.

3 is correct, acceleration is a vector so it has direction, meaning if the direction of speed changes then we will have acceleration.

4. is false, a constant velocity has a acceleration of 0.

5 is correct, motion along a straight line is linear.

Neglecting drag, the cannonball's initial height, and its horizontal motion, the maximum height rise is 110.45 metres, the time it takes for the ball to rise is 4.7 seconds, and the overall flight duration is 9.4 seconds.

Equation:

A pupil propels a cannonball 47.0 metres per second vertically upward.

assuming that the acceleration brought on by gravity is 10 m/s2.

Using the equation U2 = 2gH, the cannonball's highest point will be determined.

where H is the height the cannonball reaches.

When all the figures are put together, 47*47 = 2*10*H

H = 110.45 metres.

The cannonball's ascent time would be given by t=(2H/g).

When all the values are put together, t = (2*110.45/10)t = 4.7 seconds.

The cannonball's total flight time, T, is equal to the sum of its rise and descent times.

The ratio of ascent to descent is time.

Time of ascension = 4.7 Seconds since there is no other acceleration present and it is motion under gravity.

T = 2×(time of ascent) (time of ascent)

9.4 seconds are equal to T = 2*4.7.

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The average number of revolutions completed by each wheel in 1 minute is 283 rounds.

What is distance?

Distance is the amount of space between two points or objects. It is a measure of length and can be measured in a variety of units such as kilometers, miles, or even light-years. Distance is an important concept in mathematics, used to calculate the length of a line segment, the circumference of a circle, the area of a triangle, and the volume of a sphere. It is also used in everyday life, such as calculating the distance between two cities, or the distance a car has traveled. Distance can also be used to compare the size of things, such as the relative distance between planets.

It is symbolized as km /sec.
as per the given question-distance= 20650.5-20950.5=60km
Time = 14:04-12:34=1 hour 30 minutes
1 hour 30 minutes = 90 minutes
wheel radius = 75÷2 = 37.5 cm
wheel circumterence =235.62cm
we know,
Average speed= distance/circumentace /time
60km/235.62cm/90 = 283 rounds.

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Attribution theory describes how an individual says or thinks that something is a as a result of a person's deed or an action of an external factor.

The cause of behavior is attributed to some internal characteristic of a person rather than external forces.

It can be harmful because attributing a person's character to a mistake can lead to underestimation of an individual.

Attribution helps an individual to understand the reason behind another person's behavior and thinking.

Attribution theory is related to how ordinary people explain the causes of behavior and events that follow it. This helps them understand how they receive, interpret action, and how they give form an opinion of them.

When an person displays certain behaviors, they are usually attributed to certain internal characteristics. This theory can be harmful to explaining behavior because mistakes are attributed to character instead of external factors leading to underestimating people. On the other hand, it is beneficial to understanding people.

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The average intensity received on the Earth's surface is [tex]12.6*10^{10} W/m^{2}[/tex]

​[tex]Intensity = Rate of energy radiated/4\pi R^{2}[/tex]

where  R is the distance of the earth from the sun.

[tex]I=4*10^{26}/4\pi *[150*106*10^{3}]^{2}[/tex]

[tex]I=0.12597*10^{12}[/tex]

[tex]I=12.6*10^{10} W/m^{2}[/tex]

What is the meaning of the intensity of sunlight?

Sun intensity refers to the amount of incoming solar energy, or radiation, that reaches the Earth's surface. The angle at which the rays from the sun hit the Earth determines this intensity.

What is the average intensity received on the Earth's surface?

The average intensity received on the Earth's surface is given by:

[tex]I=rate of energy radiated/4\pi R^{2}[/tex]

Thus, the average intensity received on the Earth's surface is [tex]12.6*10^{10} W/m^{2}[/tex]

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The medium determines the speed of light in which light is travelling.

The refractive index is the ratio of the speed of light in the vacuum to the speed of light in that particular medium. The speed of light in a vacuum is 3 x 10⁸ m/s

n = c/v  

c = speed of light in the vacuum

v = speed of light in the medium

n = refractive index of the medium

The Refractive index of the water is 1.33 and for glycerin is 1.473. It means the speed of light is more in water than in glycerin. This occurs because of more density in glycerin as compared to water. The material with greater density hampers the speed of light.

Hence, more the refractive index of water slower light travel through it.

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Answer:

92.16J

Explanation:

E = ½ke²

E = ½(800)(0.48)²

E = 400 x 0.48²

E = 92.16

You can measure its mass and volume and use the equation density=mass/volume

Answer:

The car goes 100 metres in the east direction,in 4 seconds.

The car goes 50 metres in the west direction,in 1 second.

to find :
The average velocity and average speed of the car.

Explanation:

Speed is a scalar unit which means, direction is not necessary in this case. We can simply divide the total covered distance by the total taken time,in order to calculate the average speed.

So, average speed = (100 m + 50 m)/(4sec + 1sec) = (150m/5sec) = 30m/s

Now, velocity is a vector unit,which means direction is necessary in this case. We need to find the displacement (distance between starting point and ending point of the journey) and we need to divide the displacement with total taken time.

Here,east and west are opposite directions.

So, displacement = 100 m - 50 m = 50 m in east direction

Average velocity = 50m/5sec = 10m/sec

Hence,the average speed is 30m/s and the average velocity is 10m/sec.

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