Anna mixes 200 g of hot coffee at 90 oC with 50 g of cold water at 3 oC to bring down the

temperature of the coffee. Explain what happens to the mixture using kinetic molecular model.

1 watt = 1 joule/second

1 KW = 1,000 joule/second

Work = (power) x (time)

3.6 x 10⁴ J = (2,984 joules/second) x (time)

time = (3.6 x 10⁴J) / (2,984 J/s)

time = (36,000J) / (2,984 J/s)

time = 12.06 seconds

The 6cm far away could another bumblebee detect its presence. An electric field of 60 n/c.

The positive charge at the dot produces an electric field that is directed away from the positive charge. The negative charge at the dot is the target of the electric field that it produces.

The field strength in physics refers to the size of a vector-valued field, such as the electric field E's magnitude expressed in volts per meter, or V/m. For instance, an electromagnetic field produces both a strong electric field and a strong magnetic field.

Given:

Electric field E = 60 N/C

Charge q = 24 pC

Electric field \(E=K\frac{q}{r^2}\)

\(r=\sqrt{K\frac{q}{E} }\)

\(K=8.99*10^9\frac{Nm^2}{C^2}\)

\(r=\sqrt{(8.99*10^9)\frac{24*10^-12}{60} }\)

\(r=6cm\)

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By using Coulomb's law, we can calculate electric field. The electric field E for r > b is given by:

E = α / (2πrϵ0)

The electric field at a distance r from the axis of the tube, where r>b, can be calculated using Coulomb's Law. The first term represents the electric field due to a point charge at the axis of the tube and the second term represents the electric field due to the charge distribution on the surface of the tube. The distance r is measured from the axis of the tube.

To calculate the electric field in terms of α and the distance r from the axis of the tube for r>b, we can use Gauss's Law. Gauss's Law states that the electric flux through a closed surface is equal to the charge enclosed by the surface divided by the permittivity of free space (ϵ0).

For a cylindrical Gaussian surface with radius r > b, the electric field is constant along the surface, and the enclosed charge is given by the linear charge density α times the length of the cylinder. Let the length of the cylinder be L. Therefore, the enclosed charge is Q = αL.

The electric flux through the Gaussian surface is given by Φ = E × (2πrL), where E is the electric field we want to find.

Applying Gauss's Law:

Φ = Q/ϵ0
E × (2πrL) = αL/ϵ0

Now, solving for E:

E = (αL/ϵ0) / (2πrL)
E = α / (2πrϵ0)

So, the electric field E for r > b is given by:

E = α / (2πrϵ0)

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The property of the anoles that explains why the island populations evolved over time is genetic variation.

Anoles have a high level of genetic diversity, meaning that individuals within a population differ in their genes, this genetic variation allows for natural selection to occur, where individuals with advantageous traits are more likely to survive and reproduce. Over time, this can lead to the emergence of new traits and the formation of new populations with different adaptations. In the case of the Caribbean anoles, the different populations evolved due to the varying environmental conditions on the different islands.

Each population developed unique traits that allowed them to better survive in their particular environment. For example, some populations developed longer legs to better run on the ground, while others developed longer tails to better balance on trees. Overall, the high genetic diversity of the anoles allowed for the emergence of different traits through natural selection, leading to the evolution of distinct populations over time.

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Answer: However, it is not resourceful enough to replace more than a minor amount of the Earth's energy needs. Drilling through the Earth to reach areas hot enough to create steam is possible, but very expensive and difficult. .

Explanation:

Answer:

b

Explanation:

Unit conversion is a way of converting some common units into another without changing their real value. The average speed of the migrating loon flies is 45.5019 miles/hr.

Unit conversion is a way of converting some common units into another without changing their real value. for, example, 1 centimeter is equal to 10 mm, though the real measurement is still the same the units and numerical values have been changed.

Given that migrating loon flies at an average speed of 19 m/s. Now, since 1 meter is equal to (1/1609.34) miles and 1 second is equal to (1/3600) seconds. Therefore, we can write the speed as,

\(\rm Speed = 19\ \dfrac{meter}{second}\\\)

         \(=19 \times \dfrac{\frac{1}{1609.34}\rm\ miles}{\frac{1}{3600} \rm\ hours}\)

         = 19 × (3600/1609.34) miles/hr

         = 42.5019 miles/ hr

Hence, the average speed of the migrating loon flies is 45.5019 miles/hr.

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The gravitational potential energy associated with the spoon at 21 cm above the surface of the table is 0.06174 Joule.

Potential energy is a kind of energy that an object has due to its position to other objects.

If the force between two objects is a gravitational force, then the potential energy is called  gravitational potential energy.

The gravitational potential energy can be calculated as:

P.E = mg h

Where:

m = mass of the object

g = acceleration due to gravity = 9.8 m/s²

h = height relative to a reference point

In the given problem, the reference point is the table. Hence,

h = 21.0 cm = 0.21 m

m = 30 g = 0.03 kg

Then,

P.E = 0.03 x 9.8 x 0.21 = 0.06174 Joule.

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The ratio of the potentials of these surfaces is 1.2,

Option choice C is correct.

The potential at any point on an equipotential surface is constant.

Since both spheres are equipotential surfaces, the potential at the center of sphere A is equal to the potential at any point on sphere A, and likewise for sphere B.
The potential at the center of sphere A due to the point charge is given by the formula

V = kq/r,

where k is the Coulomb constant,

q is the charge,

and r is the distance from the charge to the point.

In this case,

V = kq/RA.
The potential at the center of sphere B due to the point charge is given by the same formula,

but with r = RB.

So V = kq/RB.
Taking the ratio of these two potentials, we get:
VA/VB = (kq/RA)/(kq/RB)
VA/VB = (RB/RA)
VA/VB = 0.0012/0.0010
VA/VB = 1.2.

Option choice C is correct.

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The magnitude of vector R is approximately 38.84 units. The direction of vector R is approximately -48.84 degrees counterclockwise from the +x-axis.

To find the magnitude and direction of the vector R with given x and y components, we can use the Pythagorean theorem and trigonometric functions.

Magnitude (|R|):

The magnitude of a vector is given by the square root of the sum of the squares of its components:

|R| = √(Rx² + Ry²)

   = √((-25.4 units)² + (29.4 units)²)

Calculating:

|R| ≈ √(645.16 units² + 864.36 units²)

  ≈ √(1509.52 units²)

  ≈ 38.84 units

The magnitude of vector R is approximately 38.84 units.

Direction (θ):

The direction of a vector can be found using trigonometric functions. We can use the tan⁻¹(x) function to determine the angle counterclockwise from the +x-direction:

θ = tan⁻¹(Ry / Rx)

  = tan⁻¹(29.4 units / -25.4 units)

Calculating:

θ ≈ tan⁻¹(-1.157)

Using a calculator or table, we find that:

θ ≈ -48.84 degrees

Since the direction is measured counterclockwise from the +x-axis, the angle is -48.84 degrees.

Therefore, the magnitude of vector R is approximately 38.84 units, and its direction is approximately -48.84 degrees counterclockwise from the +x-axis.

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Answer:

Explanation:

there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude or direction.

With a little additional arithmetic, we can determine that resistance of the filament at 100 watts is roughly 145 ohms using the formula R(Resistance)=E(Voltage)/I(Amps).

The bulb's power rating is 100 watt, and the rms voltage from across bulb is 220 volts, according to the query. So, to find the resistivity of the bulb, change P=100 watts with Vrms=220 watts in the formula P=V2rmsR. As a result, the bulb has a 484 ohm resistance.

The ratio of the electric current flowing through it to the voltage applied is the definition of electrical resistance for a component in the circuit or device: if there is consistent resistance over a broad range

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The work it takes to slide a crate 20 m along a loading dock by pulling on it with a 200-n force at an angle of 30° from the horizontal is 346.4J.

The energy that is transmitted to or from an object when a force is applied along a displacement is referred to as work in physics. In its simplest form, it is typically explained as the outcome of force and displacement. Positive work is the term for the component of a force that moves the point of application when it is applied. A force is said to do negative work if, at the point of application, one of its components points in the opposite direction of the displacement.

Calculations:

Work done= component of force  along displacement x displacement

                  =  F cosΘ x d

                  = 200cos 30 x2

                  = 346.4 J

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Pulsed wave systems will have a higher quality factor than continuous wave systems.

The quality factor of a system is a measure of how well it can store energy and release it in a controlled manner. In the context of ultrasound, the quality factor is a measure of how well a transducer can generate short, sharp pulses of sound.

Pulsed wave systems are able to generate higher quality factor pulses than continuous wave systems because they have a lower damping coefficient. Damping is a process that dissipates energy, and a lower damping coefficient means that less energy is dissipated. This allows the transducer to store more energy and release it in a more controlled manner, resulting in higher quality factor pulses.

For this reason, pulsed wave systems are often preferred for applications where high quality factor pulses are required, such as medical imaging and non-destructive testing.

Here are some additional details about the damping coefficient and how it affects the quality factor of a system:

The damping coefficient is a measure of how easily a system dissipates energy.

A lower damping coefficient means that less energy is dissipated.

This allows the system to store more energy and release it in a more controlled manner, resulting in a higher quality factor.

Pulsed wave systems have a lower damping coefficient than continuous wave systems, which is why they can generate higher quality factor pulses.

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Answer:

6.3 m

Explanation:

Work = force   X    distance

 600 = 95   x   d

d = 600/95 = 6.3 m

The negative charge particle located in the electron cloud of an atom is called an electron.

define electron ?

An electron is a subatomic particle that carries a negative electric charge. It is one of the fundamental particles that make up atoms, along with protons and neutrons.

Electrons are extremely lightweight, having a mass of approximately 9.11 x 10^-31 kilograms. They are found in shells or energy levels surrounding the nucleus of an atom and participate in chemical reactions and the flow of electrical current.

The negative charge particle located in the electron cloud of an atom is called an electron.

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when light passes through an ordinary window pane, its angle of emergence is the same as its angle of incidence light refracts when traveling from air into glass because light travels slower in glass then in air

Light speeds up and changes direction when it passes through water or glass at an angle and enters the atmosphere. Turning away from the usual line, the light. Imagine a tractor transitioning from a slow-moving, muddy, grassy area to a quick-moving road.

Light refracts while passing from air into glass because light travels more slowly in glass than it does in air. When light passes through a typical window pane, its angle of emergence and angle of incidence are the same.

When light travels from the less dense air into the denser glass or water, what actually happens is that it slows down. The light ray also changes direction as a result of this slowing down. Refraction is brought on by a change in the speed of the light.

Therefore, When light rays bounce off a surface, transition from one transparent medium to another, or proceed through a medium whose composition is constantly changing, they change direction.

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Answer:

Hunter is a electrician

Answer: He's an Electrician !

Explanation:

Middle part of the ear have a solid medium. The ossicles, which are bones that amplify sound waves, are located in the middle ear, therefore the medium is solid.

The outer ear is the first place that sound waves pass through, followed by the middle ear and lastly the inner ear. The first medium is gas because the external auditory canal, which is part of the outer ear, is filled with ambient air.  The ossicles, which are bones that amplify sound waves, are located in the middle ear; therefore the second medium is solid. The last medium is liquid because the inner ear is loaded with fluids like endolymph and perilymph that vibrate when sound waves pass through them.

The middle ear amplifies sound after being directed toward it by the outer ear, which is in charge of catching it.  Amplified sound waves are sent from the middle ear to the inner ear, where hair cells detect the sound waves and transmit the data to the brain.

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Answer:

T (Period) = 2 π (L / g)^1/2         for a simple pendulum

L = g * T^2 / (4 π^2)

L = 9.98 m/s^2 * 9 s^2 / 39.5 = 2.27 m

What would happen as time goes on is that the object would continue moving along a straight line.

The statement of the Newton's law would draw our minds to the law of inertia. This implies that an object that is at rest would continue to be at rest unless it is acted upon by an unbalanced force.

We also know that if an object is in motion, the object would continue to be in motion unless the object is acted upon by an external force. With this said, we are told in the question that an object is on Earth, moving at speed of 50 m/s, and all the forces on it are perfectly balanced, and stay perfectly balanced.

Given the fact that all the forces that are acting on it are perfectly balanced, we would expect that the object would have to continue to move in the forward direction.

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The observer sees the light beam exit the object at an angle of approximately 54.74° with respect to the x-axis.

What is x-axis and what is denoted on that axis?

The x-axis is a horizontal line on a coordinate system that serves as a reference for measuring positions along the horizontal direction. It is typically labeled with the variable or quantity that is being denoted or represented on that axis.

We have:

Index of refraction outside the object: n₁ = 1 (since it's air)

Index of refraction inside the object: n₂ = 1.2

Angle of incidence: θ_in = 75°

Using Snell's law:

n₁ * sin(θ_in) = n₂ * sin(θ_out)

Substituting the given values:

1 * sin(75°) = 1.2 * sin(θ_out)

To find θ_out, we can isolate it by dividing both sides by 1.2:

sin(θ_out) = (1 * sin(75°)) / 1.2

Using the property that sin(45°) = 1 / √2, we can simplify further:

sin(θ_out) = (1 / √2) / 1.2

Taking the inverse sine (arcsin) of both sides to solve for θ_out:

θ_out = arcsin((1 /√2) / 1.2)

Calculating this value using a calculator, we find that θ_out is approximately 54.74°.

Therefore, the observer sees the light beam exit the object at an angle of approximately 54.74° with respect to the x-axis.

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Answer:

I think it's second choice

Answer:

magnet b

Explanation:

because it has a stronger current so it attracts more paper clips

The jet stream is a narrow band of strong, high-altitude winds that flow in a westerly direction across the mid-latitudes of the Earth, generally between 30 and 60 degrees latitude in both hemispheres. The correct answer is d.

These winds can reach speeds of over 200 miles per hour and are caused by the differences in temperature and pressure between the polar and tropical regions. As the Earth rotates, the Coriolis effect causes the jet stream to follow a meandering. These waves can have a significant impact on weather patterns, as they can cause areas of high and low pressure to form, which can lead to storms, cold fronts, and other weather phenomena. Correct answer is option: d.

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Answer:

8.87 m/s^2  

Explanation:

Acceleration is change in velocity over a change in time

27 to 53 = 26 m/s   change in velocity

26 m/s / 3 s = 8.87 m /s^2

The density of gold can be calculated by dividing the mass of the gold nugget (16.60 g) by the volume of water it displaces (in cm3).

The density of a material can be calculated by dividing the mass of the material by its volume. The formula is Density = Mass/Volume. In this case, the mass of the gold nugget is given (16.60 g) and the volume of water it displaces can be measured by reading the graduated cylinder.

To calculate the density of gold, we need to know the volume of water that the gold nugget displaces. To find the volume, we can subtract the initial water volume (V1) from the final water volume (V2) after the gold nugget has been added. We can then use the formula density = mass/volume to find the density of the gold nugget.

Density = mass / volume

Density of gold = 16.60 g / (V2 - V1)

The volume of water displaced by the gold nugget needs to be measured in order to calculate the density of the gold nugget.

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a)The pivot should be placed one-third of the distance from the child's end, which is 3 m from the child. b)The pivot should be placed at the midpoint of the board, which is 4.5 m from either end.

a) When ignoring the board's mass, the balance of the board depends solely on the weight distribution. The pivot should be placed closer to the 25 kg child to balance the 75 kg adult on the other end. The exact location of the pivot can be determined by considering the weight ratio of the two individuals. In this case, the adult's weight is three times that of the child. Therefore, the pivot should be placed one-third of the distance from the child's end, which is 3 m from the child.

b) When the board has a mass of 15 kg, the distribution of mass along the board must also be considered. The pivot point should be placed closer to the adult to account for the additional mass concentrated on the child's end. Since the mass of the board is 15 kg, it is reasonable to assume that the mass is evenly distributed. Therefore, the pivot should be placed at the midpoint of the board, which is 4.5 m from either end. This balances the combined mass of the adult (75 kg) and the child (25 kg) with the mass of the board (15 kg).

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