a set of n = 25 pairs of scores (x and y values) has a pearson correlation of r = 0.55 and r2 = 0.74. what percentage of the variability in the y scores can be predicted by its relationship with x?

Yes, the experiment described in parts (a) and (b) does depend on the assumption that the frictional torque is independent of the platform's angular speed. This assumption is necessary in order to accurately determine the frictional torque exerted on the platform by the axle.

If the frictional torque were dependent on the platform's angular speed, then the student would need to take into account the changes in angular speed during the experiment in order to accurately determine the frictional torque. However, since the assumption is that the frictional torque is independent of the platform's angular speed, the student can focus on measuring the rotational inertia and the frictional torque without having to account for changes in angular speed.

In a school physics laboratory, the student can use equipment such as a torque meter and a rotational motion sensor to measure the frictional torque and the rotational inertia of the platform. By using these tools and the assumption that the frictional torque is independent of the platform's angular speed, the student can accurately determine the frictional torque exerted on the platform by the axle as it rotates.

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The child would have a total energy of about 435 J.

We know that the mechanical energy of the child is the sum of the potential and the kinetic energy of the child. We know that the position of the child is important to find the potential energy and the speed of the child is need to find the kinetic energy.

The total energy of the child is;

KE + PE

= 0.5 * 15 * (3)^2 + 15 * 9.8 * 2.5

= 67.5 + 367.5

Total energy of the child = 435 J in kinetic and potential energy

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Whether or not each type of glassware can be heated depends on the specific type of glassware and the method of heating.

The method of heating refers to the various ways in which heat energy can be transferred to an object or substance to raise its temperature. Some common methods of heating include:

Whether or not each type of glassware can be heated depends on the specific type of glassware and the method of heating. Some types of glassware, such as borosilicate glass, are designed to withstand high temperatures and are commonly used for heating applications, while other types of glassware may be more susceptible to cracking or breaking when exposed to heat.

Glassware that is designed for heating applications will be labeled as such and will typically have a higher temperature tolerance than glassware that is not intended for heating. Some common types of glassware that are designed for heating include Pyrex, Kimax and Vycor glass.

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Since the angle of incidence is 45° using the law of reflection we can conclude the reflective ray will also make an angle equal to the angle of incidence i.e. 45° with the normal.

1)The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.

2)The incident ray, the normal and the reflected ray are all in the same plane.

3) Incident ray and refracted ray are on different sides of the normal.

Given:

Light rays strike at an angle of 45° to the plane.

Using the law of reflection we can easily draw the reflective wave.

Important terms:

Angle of incidence - it is the angle at which the light way strikes the plane mirror.

Angle of reflection- it is the angle at which the light way is reflected back by the plane mirror.

Now since the angle of incidence is 45° using the law of reflection we can conclude the reflective ray will also make 45° with the normal.

Hence the angle of incidence is 45° and also the angle of reflection is equal to the angle of incidence i.e.45°.

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Answer:

refraction

i think i dont know dont take my answer just take it into consideration

Explanation:

The shattering of glass with the help of sound illustrates an example of resonance. Thus, the correct option for this question is C.

In physics, resonance may be defined as a type of phenomenon due to which an exterior force of a vibrating system significantly forces another system around it in order to vibrate with greater amplitude at a specified frequency of operation.

According to the context of this question, the resonance produced by the voice of Ella Fitzgerald results in the breaking or shattering of the glass. It exposes the glass to the sound wave that forces or to vibrate and distorts its shape. Physical phenomena like refraction, diffraction, and interference are related to the concept of light.

Therefore, the shattering of glass with the help of sound illustrates an example of resonance. Thus, the correct option for this question is C.

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The maximum particle velocity is equal to four times the wave velocity when the amplitude multiplied by π is equal to twice the wavelength.

If we consider the equation of a transverse wave, the maximum particle velocity (V_particle) can be found using the equation:

\(V_particle = A * ω\)

where A is the amplitude of the wave and ω is the angular frequency.

The wave velocity (V_wave) can be determined using the equation:

\(V_wave = λ * f\)

where λ is the wavelength and f is the frequency.

Given that the maximum particle velocity is equal to four times the wave velocity, we have:

\(V_particle = 4 * V_wave\)

Substituting the expressions for V_particle and V_wave, we get:

\(A * ω = 4 * (λ * f)\)
Now, we know that ω = 2πf, so we can rewrite the equation as:

\(A * 2πf = 4 * (λ * f)\)

To find the value for which this equation holds true, we can divide both sides by 2f, giving:

\(A * π = 2 * λ\)

Thus, the maximum particle velocity is equal to four times the wave velocity when the amplitude multiplied by π is equal to twice the wavelength.

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Answer:

d. are easily compressible.

Explanation:

Solids and liquids are not easily compressible while gas is.

An interesting question about human behavior that is of interest to me would be: "What factors contribute to the development of a sense of self-esteem in children?"

I am interested in this question because self-esteem is an important psychological construct that is thought to play a key role in mental health and well-being. Low self-esteem can be linked with a number of negative outcomes, such as depression, anxiety, and poor academic performance, while high self-esteem has been linked with positive outcomes, such as happiness and resilience. Understanding the factors that contribute to the development of self-esteem in children can help parents, educators and health professionals to create effective interventions that can help children to develop a strong sense of self-worth.

This question relates to psychology because it deals with the psychological construct of self-esteem, which is central to the field of psychology. It is a question that can be studied and explained through the research of cognitive, social and developmental psychology.

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It would be a parallel circuit.

Answer:

I = 0.75 Amp

Explanation:

Ohm's Law

Ohm's law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points. The constant of proportionality is called the Resistance (R) of the conductor.

The formula can be expressed as:

V = I.R

The intensity of the current through a resistor can be calculated by solving the equation for I:

\(\displaystyle I=\frac{V}{R}\)

A flashlight bulb is an example of a resistor with the specific task to emit light when it's hot enough.

The potential difference (or voltage) is V=6 V and the resistance is R=8Ω, thus the current is:

\(\displaystyle I=\frac{6~V}{8~\Omega}\)

I = 0.75 Amp

The critical angle for a special glass in air is 41.

The critical angle if the glass is immersed in water is approximately 34.7 degrees.

When light flows from one medium to another, it is completely internally reflected at the critical angle. The critical angle in this example is the angle at which light is completely internally reflected when it goes from glass to air.

Because water has a greater refractive index than air, the critical angle of a glass in water is lower than the critical angle of a glass in air. The critical angle in water is equal to the arc-cosine of the inverse of the ratio of water's refractive index to that of glass. The critical angle in water in this scenario would be equal to the arc-cosine of the inverse of the ratio of 1.33(water's refractive index) to 1.5 (the refractive index of the special glass). This means that the critical angle in water is equal to the arc-cosine of 0.867, which is around 34.7 degrees.

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Answer:

don't exist

Explanation:

Answer:

it has most potential at highest point (not in space), But kinetic at lowest

Answer: When the ball is highest in the air it has the most potential energy and it has the most kinetic energy when it is about to hit the ground thats when it is moving fastest.

Answer:

false

Explanation:

Answer:

The answer is B false

Explanation:

Gamma radiation is not composed of both neutrons and protons.

Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).

Explanation:

The wave speed of the second wave is 100 m/s

The wave speed of a wave on a string is dependent on the properties of the string, such as its tension and mass per unit length. Since the tension of the string is fixed in this scenario, we can assume that the wave speed remains constant for both the 100 Hz and 200 Hz waves.
To find the wave speed, we can use the equation v = fλ, where v is the wave speed, f is the frequency, and λ is the wavelength. Since we know the frequency of the first wave is 100 Hz and its wave speed is 50.0 m/s, we can solve for its wavelength:
v = fλ
50.0 = 100λ
λ = 0.5 m
Now that we know the wavelength of the first wave, we can use the same equation to find the wave speed of the second wave:
v = fλ
v = 200(0.5)
v = 100 m/s
Therefore, the wave speed of the second wave is 100 m/s. This makes sense, as higher frequency waves tend to have shorter wavelengths and therefore faster wave speeds.

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EAC( Low-energy lightbulb )=18.47 EAC( Conventional lightbulb )=7.33 Conventional lightbulb is cheaper to operate. Option D

To calculate the Equivalent Annual Costs (EAC), we need to consider the initial cost, maintenance costs, and the present value of future costs, taking into account the discount rate.

The EAC (Equivalent Annual Cost) is calculated by summing up the annual costs of the lightbulb over its lifetime, discounted at the real discount rate of 4%.

For the low-energy lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $3.60 + ($2.00 / (1 + 0.04)^1) + ($2.00 / (1 + 0.04)^2) + ... + ($2.00 / (1 + 0.04)^9)

≈ $18.47

For the conventional lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $0.60 + ($7.00 / (1 + 0.04)^1) + ($7.00 / (1 + 0.04)^2) + ... + ($7.00 / (1 + 0.04)^1)

≈ $7.33

Since the EAC for the low-energy lightbulb is $18.47 per year and the EAC for the conventional lightbulb is $7.33 per year, the conventional lightbulb is cheaper to operate assuming a burnt-out bulb is replaced by an identical bulb.

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Answer:

E.) Sound Waves are an example of longitudinal waves.

Explanation:

I was sure either A or E was correct so I had to look it up. In reference to three sources, it is proven that sound waves are longitudinal. Therefore, without a doubt, I would try to go with E. I know D is wrong as well as B most definitely. That is because sound always requires a medium to travel through in order to be heard; additionally sounds don't necessarily have to be a certain rate of loudness in order to be considered of different quality. Therefore leaving you with A, C, or E. Additionally C is a false fact as well. So I highly suggest choosing E because there is sufficient sources to prove that. I'll provide a direct link down below.

https://www.bing.com/search?q=are+sound+waves+longitudinal+waves&cvid=fc17d9f3f744496da334cf10a7daad57&aqs=edge..69i57l2j69i60j5j69i61j69i60l2.5395j0j1&pglt=2339&FORM=ANNTA1&PC=NMTS

The correct statement is sound waves are an example of longitudinal waves.

In a longitudinal wave, the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky. We can make a horizontal longitudinal wave by pushing and pulling the slinky horizontally.

Sound is a longitudinal wave that alternately compresses and decompresses the component particles of the medium through which it travels.

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Answer:

When the piston is pulled up, air gets sucked into the pump through the inlet. The pump chamber depressurizes as it fills with air. When the piston is forced down, the air becomes compressed and closes the inlet. Then the air flows out from the outlet

When the two magnets are made to move, the energy of the system in the system tends to change potential energy into the kinetic energy

Potential energy is the energy stored in the body while is at rest which would turn into kinetic energy when the object will initiate motion. This conversion of potential energy to kinetic energy is understood by the Work-Energy theorem. The kinetic energy is formulated as,

K.E. = 1/2 mv²

where K.E = Kinetic energy

m = mass of an object

v = velocity of the object

The work-energy theorem is stated as the products of all the forces acting on the system are equal to the difference in kinetic energies.

∑W = ΔK.E

where W = Work done on the system

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Assuming a constant rate of Earth's rotation and neglecting any axial tilt effects, Rigel, a star, would rise approximately 4 minutes earlier each day. Therefore, if Rigel rises at 6 PM today, it would rise at around 5:56 PM tomorrow. In one month, comprising roughly 30 days, Rigel would rise approximately 2 hours earlier, at around 4 PM. These calculations are based on the assumption that the observer's location on Earth remains constant, and no other factors, such as atmospheric conditions or the star's own motion, significantly affect the timing of Rigel's rise.

The Earth rotates approximately once every 24 hours, causing the stars to appear to rise and set each day. This rotation rate is relatively constant over short timescales. Therefore, if a star rises at a specific time on a given day, it will rise approximately 4 minutes earlier the following day, as 24 hours divided by 60 minutes gives an average of 4 minutes per minute of Earth rotation. Multiplying this by the number of days in a month (30) results in approximately 2 hours earlier for the star's rise time.

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Answer:

2km/min

Explanation:

Velocity= change in distance / time taken

Velocity = 20km/10min=2km/min south

South is placed there to show what direction she went, as velocity has both magnitude and direction

Answer:

Chemical change

Explanation:

A chemical change is what happens. The food digested changes smell due to some enzyme the has acted on the food which catalyzes the rate of digestion. The enzymes acts on the food in order to speed up the rate of the reaction (digestion) and in turn causing the smell.

Answer:

B

Explanation:

4.3 m/s. C. 5.8 m/s. D. 7.7 m/s. 14. A crane lifts a 300 kg load at a constant speed to the top of a building 60 m high in 15 s. The average power.

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The extra cost of fuel for driving 83 mph instead of 73 mph is $3.7671.

The speed of your automobile has a huge effect on fuel consumption. Traveling at 65 miles per hour (mph) instead of 55mph can consume almost 20% more fuel. As a general rule, for every mile per hour over 55 , you lose 2% in fuel economy.

If you take a 400-mile trip and your average speed is 83mph rather than the posted speed limit of 73mph, then the extra cost of the fuel is calculated as:

* **Fuel consumption at 83 mph:** 30 mpg * (1 - 2% * (83 - 55)) = 27.6 mpg

* **Fuel consumption at 73 mph:** 30 mpg * (1 - 2% * (73 - 55)) = 29 mpg

* **Extra fuel used:** 400 miles / 27.6 mpg - 400 miles / 29 mpg = 2.4 gallons

* **Extra cost of fuel:** $3.26/gallon * 2.4 gallons = $3.7671

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Answer:

B. a large change in velocity over a short time interval

Explanation:

A "chjange in velocity" is acceleration.  Acceleration is in units of meters/sec/sec or meter/sec^2.

)meters/sec) is velocity.  Sec is the time.

Velocity/Time:  A large change on the top (Velocity), divided by a small change in the bottom (sec) means the largest value for accceleration.

Answer:

C. gravitational

Explanation:

Answer:

c

Explanation:

edge

Answer:

O Intense rain or an earthquake

Explanation:

Landslides can be initiated in slopes already on the verge of movement by rainfall, snowmelt, changes in water level, stream erosion, changes in ground water, earthquakes, volcanic activity, disturbance by human activities, or any combination of these factors.

Intense rain or an earthquake can trigger a landslide.

In conclusion, intense rain or an earthquake can trigger a landslide.

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