a coin falls faster than feather on earth

2 miles an hour

4 devided by 2

Answer:

2 miles per hour is the answer

Answer:

The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.

As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.

Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both  phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.

The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.

The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.

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Answer:

Its physical change for sure.

Explanation:

Because the water is H2O even if its in vaporised.

The speed of the wave of wavelength 0.21 m is 23.1 m/s. And the correct answer is 0A. 23.1 m/s.

The speed of a wave is calculated by multiplying the wavelength and the frequency of the wave.

To calculate the speed of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the speed of the wave is 23.1 m/s.

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It is not possible to answer this question without more information about the distance between cities A and D, the distance between A and B, and the range of the station in City A.

What is distance?
Distance is a measurement of the distance apart two objects or points are, either numerically or occasionally qualitatively. Distance can be a physical length in physics or to an estimate based on other factors in everyday language (e.g. "two counties over"). The term is frequently was using metaphorically to refer to a measurement of the distance between two common pieces or even a degree of separation because spatial cognition is indeed a rich source of implicatures throughout human thought. The concept of a metric space is used in mathematics to formalise the majority of these notions of range, both literal and figurative. Distance in the social sciences can refer to different types of separation, including such social or psychological distance.

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The bargaining power of suppliers for Suncor Energy is influenced by factors such as supplier concentration, specialized inputs, high switching costs, and the potential for suppliers to integrate forwards. Rivalry in the industry is affected by competitor concentration, industry growth rate, high fixed costs, high exit barriers, and low  differentiation.

1. Bargaining Power of Suppliers:

The bargaining power of suppliers for Suncor Energy can be analyzed based on several factors. If the suppliers in the industry are concentrated and there are only a few of them, it may give them more power to dictate terms and conditions. Additionally, if the suppliers provide specialized inputs that are rare or unique, it can increase their bargaining power. High switching costs, where it is disruptive or expensive for Suncor Energy to change suppliers, can also strengthen the suppliers' position. Furthermore, if suppliers have the ability to integrate forwards, such as low-cost airlines cutting out the use of travel agents, it can further impact the bargaining power.

2. Rivalry in the Industry:

The level of rivalry in the industry can be assessed by considering various factors. Competitor concentration and balance play a role in determining the intensity of competition. If there are a few dominant players or a balanced market share distribution, it can impact the competitive dynamics. The industry growth rate is also important as a high growth rate can lead to more intense rivalry. High fixed costs, such as those associated with infrastructure or equipment, can create barriers to entry and affect the competitive landscape. Similarly, high exit barriers, which make it difficult for companies to leave the industry, can contribute to intense rivalry. Finally, low differentiation among competitors can lead to price-based competition and increased rivalry.

By analyzing these factors, Suncor Energy can gain insights into the overall industry structure and attractiveness. Additionally, assessing recent and expected future changes for each force can help anticipate shifts in the competitive landscape and make informed strategic decisions.

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Answer:

a. A book resting on the floor

Explanation:

Potential energy is the energy stored in a object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above/below the zero height.

Answer:

by using v = u + at equation we can find "a"

14 = 60 - 2.7a

2.7a = 60 - 14

2.7a = 46

decceleration = 17.03

Answer:

I learned about human body, and cause of global warming.

Explanation:

These topics were so great to learn because I didn't know about Endocrine system, but now I know the job and the importance of  the Endocrine system. Also, I learned about global warming and I never knew what the cause of it was and it was great to learn new things!

Answer:

9.81N

Explanation:

the force of attraction is given by

F=GmM/R²

where m is mass of the body

M is mass of the earth

R is radius of the earth

G is the universal gravitational constant(6.67x10-¹¹)

hence we substitute the values in the formula.

you can ask questions

The force of gravity between the object and the earth? (mass of the earth = 5.97 x 10 24kg, radius of the earth = 6.37 x 10 6m) is 9.8 N.

using Newton's law of universal gravitation,

F = G m₁m₂ / r²

where

F = force of gravity

G = 6.67 × 10⁻¹¹N.m² / kg²

m₁ = mass of the object = 1kg

m₂ = mass of the earth = 5.97  ×  10²⁴ kg

r = distance from the centre = 6.37  × 10⁶ m

Therefore,

F = 6.67 × 10⁻¹¹ × 1 × 5.97  ×  10²⁴ / 6.37  × 10⁶

F = 39.8199 × 10¹³ / (6.37  × 10⁶)²

F = 39.8199 × 10¹³ / 4.05  × 10¹³

F = 9.83207407407

F ≈ 9.8 N

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The wave interaction that can cause a spoon to appear broken in a glass of water is called refraction.

Refraction occurs when a wave, such as light, passes from one medium to another with a different density or refractive index. When light waves travel from air into water, for example, they undergo a change in direction due to the change in speed caused by the difference in optical properties between the two mediums.

In the case of the spoon in a glass of water, the light waves coming from the spoon encounter the air-water interface. As they pass from air into water, they undergo refraction, causing a change in their direction. This change in direction can create an optical illusion where the spoon appears to be bent or broken at the water's surface.

This phenomenon is a result of the bending of light rays as they pass through different mediums with different refractive indices, and it is a common example of how refraction can distort the perception of objects when viewed through different mediums.

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The peak pressure gradient is 36 mmHg. Thus, option B is the correct answer.

The equation is ΔP = 4v², where ΔP is the pressure drop in millimeters of mercury (mmHg) and v is the peak systolic velocity in meters per second (m/s) measured by Doppler echocardiography.

The pressure gradient is expressed as the pressure difference between two points divided by the distance between the points.

In this case, the given peak systolic velocity is 3 m/s. Substituting this value into the equation, we get: ΔP = 4(3 m/s)² = 36 mmHg

Therefore, the peak pressure gradient across the stenotic valve is 36 mmHg. This means that the pressure difference between the two sides of the valve is 36 mmHg, which can cause symptoms such as shortness of breath, chest pain, and fatigue in patients with valvular heart disease.

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Answer: The answer is an electric generator

Explanation:

I just took the quiz and I thought it was an electric motor but the correct answer was an electric generator.

This concept of closed loop wire experiences a changing magnetic field and flowing of current is related to the Faraday's law of electromagnetic induction.

When ever there is a bar magnet inside the wire and the magnet moves relative to the wire there will be an EMF generated in the coil and current can be flown.

similarly by reversing the process if the magnet remains stationary and the coil is moved then again the emf and the current generated in the coil which is called as electromagnetic induction.

This is the basic principle of transformers,generators,motors .

Thus when a closed loop of wire experiences a changing magnetic field a voltage and therefore current is produced.

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Answer:

D. muscular strength

Explanation:

Lifting any weight requires force to lift it. This force is the result of the muscular strength of the body. It is the muscular strength that determines the weight that a body can lift without any exhaustion. Muscular strength depends on the size of the muscular fibers and the nerves' ability. They help in activating the strength of the muscle. Lifting the objects and the ability to lift it are the outcome of the strength muscles have.

In the given situation, Dawn is trying to find her muscular strength.

Answer:

d

Explanation:

d

Option B  \(\rm v_f = v_i + at\) is the  equation should you use to solve acceleration.

With an item's starting velοcity (u), acceleratiοn (a), and travel time (t), this displacement calculatοr determines the distance travelled οr displacement (s) οf the οbject. The utilised equatiοn is s = ut + 1/2at², and it is changed belοw tο demοnstrate hοw tο sοlve fοr each variable separately.

Area beneath a velοcity-time graph can be used tο determine an οbject's displacement. If the graph's lines are straight, yοu may cοmpute the area under the graph by using geοmetry οr by cοunting the squares next tο the line (particularly if the lines οf the graph are curved).

Here,

D. \(\rm \Delta x = v_{f} \times t - 1/2 \times a \times t^2\)

is not acceleration because times is  squared with a

A. \(\rm \Delta x = 1/2 \times (v_{f} + v_{i})t\) also incorrect as the value final and initial velocity are being add.

C. \(v_{f} ^ 2 = v_{i} ^ 2 + 2a\Delta x\) not this as times is not used,

B. \(\rm v_f = v_i + at\) also written as \($ \rm a = \frac{vf -Vi }{t}\) which the formula of acceleration can be used here as the difference final and initial velocity is given with respect to time.

Thus, option B  \(\rm v_f = v_i + at\) is the  equation should you use to solve acceleration.

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Complete question:

Answer:

satellite B

Explanation:

A .F= G (mM)/r²

B .F= G (2mM)/r² = 2G (Mm)r²

C .F= G (3mM)/(2r)² = ¾G (mM)/r²

D .F= G (4mM)/(2r)² = G (mM)/r²

When a positive charge moves from left to right through a pair of oppositely charged electric plates, it follows a specific path due to the electric field produced by the plates.

The electric plates in the diagram have opposite charges. The top plate is positively charged, while the bottom plate is negatively charged. When a positive charge is placed in the electric field, it experiences a force that pushes it towards the negative plate. This is because opposite charges attract each other.

The path that the positive charge follows depends on the strength of the electric field and the speed at which it is moving. If the electric field is weak, the positive charge will not experience a significant force and will move in a straight line from left to right. However, if the electric field is strong, the positive charge will experience a stronger force and will curve towards the negative plate.

The direction of the force can be determined using the right-hand rule. If the positive charge is moving from left to right and the electric field is pointing down (from the positive plate to the negative plate), then the force on the charge will be towards the center of the plates (in the direction of the negative plate).

In summary, the path of a positive charge moving from left to right through a pair of oppositely charged electric plates depends on the strength of the electric field and the speed at which it is moving. If the electric field is weak, the charge will move in a straight line. If the electric field is strong, the charge will curve towards the negative plate. The direction of the force can be determined using the right-hand rule.

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The force exerted on Alice’s foot as she kicks the ball is 1.25 N.Force can be defined as the influence that can accelerate the object.

Force can be defined as the influence that can accelerate the object. From Newton's Second Law of motion,

\(F = ma\)

Where,

\(F\) - force

\(m\) - mass = 0. 25 kg

\(a\) - acceleration = 5 N

Put the values in the formula,

\(F = 0.25 \times 5\\\\F = 1.25 \rm \ N\)

Therefore, the force exerted on Alice’s foot as she kicks the ball is 1.25 N.

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When a sound wave is produced by the speaker, it travels down both tubes and bounces back at the closed end of each tube. This creates a standing wave, which is a wave that appears to be standing still. The standing wave has nodes, which are points where there is no motion, and antinodes, which are points of maximum motion.

As the frequency of the sound wave is increased, the distance between nodes and antinodes changes. At certain frequencies, the distance between the nodes and antinodes in both tubes is the same, and both tubes resonate simultaneously.

The resonant frequency of a tube depends on its length, and can be calculated using the equation f = nv/2L, where f is the frequency, n is the number of antinodes in the standing wave, v is the speed of sound, and L is the length of the tube. When the lengths of the tubes are slightly different, their resonant frequencies will also be slightly different. This is why initially only one tube resonates at a time.

At very high frequencies, both tubes resonate because the distance between the nodes and antinodes becomes very small. This means that the slight difference in tube lengths no longer matters, and both tubes resonate simultaneously. However, at low frequencies, the distance between the nodes and antinodes is too large for both tubes to resonate at the same time.

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Answer:

SEE BELOW

Explanation:

Sound travels faster in warmer air, so the sound waves are refracted upward, away from the ground. Various atmospheric conditions can cause a temperature inversion, with air temperature increasing with height. This causes some of the sound energy from a source near the ground to be refracted back toward the ground.

Two metal plates would need to be separated by 0.01771 millimeters in order to have a capacitance of 1 F.

As an illustration, each conducting plate would have charge q = CV or q = (3 farads)x(5 volts) = 15 Coulombs of charge if a capacitor with a capacitance of 3 farads was connected to a 5-volt battery.

The ratio of the maximum charge Q that may be stored in a capacitor to the applied voltage V across its plates is known as the capacitance C of a capacitor. In other terms, capacitance is the capacity of the device to store the most charge per volt: C = Q V . C = Q V.

C = Capacitance in Farads

ε = Permittivity of dielectric (absolute)

A = Conductor area, in square meters

d = Separation distance, in meters

= 17.71 micro-meters

= (17.71 × 10−6 meters)

= or 0.01771 millimeters.

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The relative humidity is 50%, indicating the air is holding half of the moisture it can hold at the current temperature, aiding in weather predictions.

Given that an air parcel is sinking 1 km, the temperature in the parcel increases by 10 degrees C, but the vapor pressure remains constant. The vapor pressure in the parcel is 10 hPa, and the saturation vapor pressure is 20 hPa within the parcel. To calculate the relative humidity, we use the formula: Relative Humidity = Vapor pressure / Saturation vapor pressure * 100.

Plugging in the given values, we have: Relative humidity = 10 / 20 * 100. Simplifying the equation, we find that the relative humidity is 50%.

A relative humidity of 50% indicates that the air is holding half the amount of moisture it is capable of holding at the current temperature. This measure is crucial in meteorology as it helps forecasters predict cloud formation, precipitation, and other weather phenomena.

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Answer:

The amount of heat needed to heat  2 kilograms of water from 24.0°C to 100.0°C to make a cup of tea is (C) 640,000 J.

Explanation:

How to calculate the amount of heat needed?

        Q = m s Δ t

        where Q = the amount of heat needed

        m = mass of the substance being heated

        s = specific heat of the substance being heated

        and Δ t = the difference between the final and initial temperatures.

It is given that 2 kilograms of water are to be heated from 24.0°C to 100.0°C to make a cup of tea and the specific heat of water is 4186 J/kg°C.

Therefore,

Putting these values in the equation Q = m s Δ t we find,

Q = 2 x 4186 x 76 J

    = 636272 J

    ≈ 640,000 J.

Thus the amount of heat needed to heat  2 kilograms of water from 24.0°C to 100.0°C to make a cup of tea is (C) 640,000 J.

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The total work done by the woman is 1000J.

The work done by a force is defined as the product of the displacement component of the force and the magnitude of that displacement. method. Work can be calculated by multiplying the force and the displacement in the direction of the force as

When a person pushes against a wall the displacement of the wall is zero because the wall does not move when a force is applied to it. The work done by a force is the product of the component of the force applied to the body in the direction of displacement and displacement.

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Answer:

The answer is B. Silver

Explanation:

I took AP3X quiz.

Answer:

Easy, accurate control

Multi-function control

High horsepower, low weight ratio

For light of wavelength 629.0 nm, the index of refraction in water is approximately 1.33, and in glass, it is approximately 1.5.

To determine the index of refraction in water and glass for light of wavelength 629.0 nm, we need to use the equation for index of refraction:

Index of refraction (n) = c / v

where c is the speed of light in a vacuum and v is the speed of light in the medium.

The speed of light in a vacuum is approximately 3.0 x 10^8 meters per second (m/s).

For water:

The speed of light in water is slower than in a vacuum. The index of refraction for water varies slightly with wavelength, but for simplicity, we can use an average value of 1.33.

Index of refraction (water) = c / v = 3.0 x 10^8 m/s / v

To find v, we need to use the equation for the speed of light in a medium:

v = c / n

Substituting the values, we have:

v (water) = c / n (water) = 3.0 x 10^8 m/s / 1.33 = 2.26 x 10^8 m/s

Now we can find the index of refraction (n) in water for light of wavelength 629.0 nm:

n (water) = c / v (water) = 3.0 x 10^8 m/s / 2.26 x 10^8 m/s ≈ 1.33

For glass:

The index of refraction for glass varies depending on the type of glass. Let's assume a typical value of 1.5 for simplicity.

Index of refraction (glass) = c / v = 3.0 x 10^8 m/s / v

Using the same equation as before, we find:

v (glass) = c / n (glass) = 3.0 x 10^8 m/s / 1.5 = 2.0 x 10^8 m/s

And the index of refraction (n) in glass for light of wavelength 629.0 nm is:

n (glass) = c / v (glass) = 3.0 x 10^8 m/s / 2.0 x 10^8 m/s = 1.5

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The denominator is 0, indicating that the final angular speed is undefined in this case. This means that it is not physically possible for the man to reach a point 0 m from the center without any change in the moment of inertia of the system.

To solve this problem, we can apply the principle of conservation of angular momentum. Initially, the angular momentum of the system is given by:

L_initial = I_initial * ω_initial

where L_initial is the initial angular momentum, I_initial is the initial moment of inertia, and ω_initial is the initial angular speed.

When the man walks to a point 0 m from the center, the moment of inertia of the system changes. The new angular momentum can be calculated using:

L_final = I_final * ω_final

where L_final is the final angular momentum, I_final is the final moment of inertia, and ω_final is the final angular speed.

Since angular momentum is conserved, we can equate the initial and final angular momenta:

L_initial = L_final

I_initial * ω_initial = I_final * ω_final

Now, let's calculate the initial and final moments of inertia:

For the initial moment of inertia (I_initial), the man is standing 2.2 m from the axis of rotation. Since the merry-go-round is modeled as a solid cylinder, the moment of inertia of a solid cylinder is given by:

I_initial = (1/2) * m * r^2

where m is the mass and r is the radius. Plugging in the values:

I_initial = (1/2) * 83 kg * (2.2 m)^2

I_initial = 162.86 kg·m^2

For the final moment of inertia (I_final), the man is at a point 0 m from the center. In this case, the moment of inertia can be calculated as:

I_final = m * r^2

Plugging in the values:

I_final = 83 kg * (0 m)^2

I_final = 0 kg·m^2

Now, let's solve for the final angular speed (ω_final):

I_initial * ω_initial = I_final * ω_final

162.86 kg·m^2 * (0.5 rev/s) = 0 kg·m^2 * ω_final

ω_final = (162.86 kg·m^2 * (0.5 rev/s)) / 0 kg·m^2

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Wave speed (S) decreases, wavelength (L) decreases, height (H) increases, and wave steepness (\(\frac{H}{L}\)) increases when  the wave moves across shoaling water to break on the shore.

The distance a wave travels in a given amount of time, such as the number of meters per second, is referred to as its wave speed. The equation Speed = Wavelength x Frequency relates wave speed to wavelength and frequency. When the wavelength and frequency are known, this equation can be used to calculate wave speed.

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