a.) What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.01 mm in 20 degrees celcius water?

Answer:

2.A flowerpot falling from a balcony

Explanation:

Potential energy is the internal energy within a body at rest or at a height above the ground. In this case of the falling flowerpot, the flowerpot initially has a potential energy due to its position on the balcony above the surface of the earth. As the flowerpot falls, the work done against gravity in taking the flowerpot to this height on the balcony (equivalent to the potential energy) is transformed into the kinetic energy of motion as the flowerpot falls down through the height.

Answer:

DNA IS SMALLEST

NUCLEUS IS BIGGEST

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The correct pairs are:

distance to object A: 0.000006127 light-years

distance to object B: 30.06 AU

distance to object C: 0.082 light-years

The correct pairs in alternative units are:

distance to object A: 0.0001458 pc

distance to object B: 5.2 AU

distance to object C: 57.91 million km

distance to object A: 0.000001877 pc = 0.000006127 light-years (using the conversion factor 1 parsec = 3.262 light-years)

distance to object B: 30.06 AU (no conversion needed as the distance is already given in astronomical units)

distance to object C: 778.3 million km = 0.082 light-years (using the conversion factor 1 light-year = 9.5 × 10^12 km)

So, the correct pairs are:

distance to object A: 0.000006127 light-years

distance to object B: 30.06 AU

distance to object C: 0.082 light-years

Alternatively, we can express the distances in other equivalent units:

distance to object A: 0.0001458 pc (using the conversion factor 1 light-year = 9.5 × 10^12 km)

distance to object B: 5.2 AU (using the conversion factor 1 AU = 1.5 × 10^8 km)

distance to object C: 57.91 million km (no conversion needed as the distance is already given in kilometers)

So, the correct pairs in alternative units are:

distance to object A: 0.0001458 pc

distance to object B: 5.2 AU

distance to object C: 57.91 million km

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Answer:

a. During each second the object travels 4.9 m

The distance, s, the object traveled each second is s = (u × 1 + 4.9) meters

b. The average speed at time t = 4s is 39.2 m/s

the average speed at t = 4 second  is 78.4 m/s

c. The instantaneous speed at time t = 3 s is 29.4 m/s

The instantaneous speed at time t = 3 s is 44.145 m/s

d. The average acceleration at time t = 1 s is 9.8 m/s² is correct

e. The average acceleration at time t = 3 s is 29.4 m/s²

The average acceleration at time t = 3 s is 9.81 m/s²

Explanation:

a. During each second the object travels 4.9 m

The distance, s, the object traveled each second is s = (u × 1 + 4.9) meters

b. The average speed at time t = 4 s is 39.2 m/s

The speed is given by the following equation;

v = u + g·t

Where;

u = The initial velocity =  m/s

g = The acceleration due to gravity

t = The time

At the third second, the speed is given as follows;

t = 3 s

v = 0 × 3 + 1/2×9.81×3² = 44.145 m/s

At the fourth second, the speed is given as follows;

t = 4 s

v = 0 × 4 + 1/2×9.8×4² = 78.4 m/s

Therefore, the average speed at t = 4 second  is 78.4 m/s

Similarly

The distance covered at t = 4 = 1/2×9.8×4² = 78.4

The time = 1 s

Average speed = Distance/Time = 78.4/1 = 78.4 m/s

c. The instantaneous speed at time t = 3 s is 29.4 m/s

The instantaneous speed is given by the following equation;

v = u + g·t

At the third second, the speed is given as follows;

t = 3 s

v = 0 × 3 + 1/2×9.81×3² = 44.145 m/s

The instantaneous speed at time t = 3 s is 44.145 m/s

d. The average acceleration at time t = 1 s is 9.8 m/s²

The acceleration of the object in free fall is constant and equal to 9.8 m/s²

e. The average acceleration at time t = 3 s is 29.4 m/s²

Neglecting air resistance, an object in free fall has a constant negative acceleration of 9.81 m/s²

Therefore, the average acceleration at time t = 3 s is 9.81 m/s²

According to the inverse square law of light, the apparent brightness of an object change if its distance to us doubles decrease by a factor of 4.

The inverse square law will increase because the rectangular of the space, the brightness of the light ought to decrease as the inverse rectangular of the space. therefore, brightness follows the inverse-rectangular law.

The reality that mild from a point supply obeys the inverse rectangular law is used to gain in measuring astronomical distances. when you have a source of acknowledged intrinsic brightness, then it could be used to degree its distance from the Earth by using the inverse square law.

The plain brightness of a celebrity is proportional to at least one divided by using its distance squared. this is, in case you took a celebrity and moved it two times as some distance away, appear as vibrant if you moved it four times the gap, appear as brilliant. The motive this happens is straightforward.

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The apple will fall in 0.00014 seconds

The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.

u = 5 m/h = 0.00139 m/s

using kinematic equation

v = u + at

v = final velocity = 0

g = acceleration due to gravity

t = time = ?

using

v = u - g*t

0 = 0.00139  - 9.8 t

t = 0.00139 / 9.8  = 0.00014 seconds

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The correct answer is E(r) = q/(4πr2ε_0)

The charge has now been extended along the z axis, so think about that scenario. Typically, this is referred to as a line charge. A line charge density is typically measured by the lambda variable, which has units of coulombs per metre (in the SI system).

The field lines must lie in planes that are perpendicular to the wire because symmetry requires that the electric field point radially outward from the wire at each point. It is recommended to utilise a cylindrical Gaussian surface with the line charge as its axis for calculating the size of the radial electric field E(r) produced by a line charge with charge density λ. The cylindrical surface's length L ought to cancel out in the expression for E. (r). The equation for E using this situation and Gauss's law (r).

E(r) = q/(4πr2ε_0)

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Answer:

V = I * R        voltage drop

P = I * V = I^2 * R        power

I = P / V = 327 / 15 = 21.8 amps

b)   I = 21.8 amps

a) R = P / I^2 = 327 / 21.8^2 = .69 ohms

Check:

V = I R = 21.8 * .69 = 15 Volts

When the graph of distance travelled with time is not straight, it implies that the acceleration is constant.

The acceleration of an object is the rate of change of velocity with time.

Mathematically, the formula for the acceleration of an object is given as;

a = Δv / Δt

where;

The slope of velocity time graph is acceleration. This implies that acceleration increases with increase in velocity of an object.

However, if the graph of the distance travelled by an object with time is straight, it implies that the velocity is not uniform.

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Answer:

5.05 sec

Explanation:

h = 1/2gt²

solve for t:

t² = (2h)/g

t = √(2h)/g = √((2)(125 m)) / (9.8 m/s²) = 5.05 s

An object with the higher temperature can have less thermal energy than an object with the lower temperature because of the mass difference.

The thermal energy of an object is given by the relation,

Q = mC∆T

Where,

Q is the thermal energy,

m mass of the bodies,

C is the specific heat capacity and,

∆T is the change and temperature.

As we can see, from the above relation that thermal energy is depending on the specific heat and mass of the body. We can understand this thing by the example of an Iceberg and a cup of hot tea. The Iceberg is at a much lower temperature but it has a higher amount of thermal energy because it has a bigger amount of mass.

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By convection mechanism solar energy reach the Sun's photosphere from the layer just underneath it. So the correct option is e.

The mechanism by which solar energy reaches the Sun's photosphere from the layer just underneath it is convection. The Sun's interior is extremely hot, and the heat produced by nuclear fusion in the core is transported to the photosphere by convection. This means that hot, less dense plasma rises to the surface, where it cools and sinks back down, creating a cycle of rising and sinking material. As the plasma rises, it carries energy in the form of radiation with it, which is ultimately released as visible light in the photosphere. Convection is the most efficient way to transport heat and energy over such large distances, and it plays a crucial role in the structure and dynamics of the Sun.

It's important to note that the Sun's internal structure is divided into layers, each with its unique characteristics and mechanisms of energy transfer. Energy generated in the Sun's core is transported to the photosphere through a combination of radiation and convection. Once the energy reaches the photosphere, it is radiated out into space in the form of visible light and other forms of electromagnetic radiation. Therefore, the answer to the question would be "none of the above" because it contains a false premise.

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Answer:

Television: Electricity to light Toaster: Electricity to Heat

Explanation:

ENERGYY

Neptune's mass, speed, and diameter, as well as those of each moon. when a physicist wants to create a computer model to forecast the impact of gravitational forces.

An example of an amphetamine is speed. It is a psychoactive drug that releases significant amounts of dopamine. A chemical in the brain associated with reward and pleasure is called dopamine. There are several types of amphetamines.

Speed is often compared to words like dispatch, enterprise, haste, and rush. These phrases all refer to "quickness in move or action," but speed implies quick effectiveness in movement or activity.

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Answer:

x = 0.4 m

Explanation:

When a spring is stretched from its equilibrium position. Some energy is stored in the spring. This energy is called the elastic potential energy of the spring. The formula used to calculate the magnitude of this stored energy is given as follows:

P.E = (1/2)kx²

where,

P.E = Elastic Potential Energy Stored in the spring = 45 J

k = Spring Constant = 540 N/m

x = amount of stretching = ?

Therefore,

45 J = (1/2)(540 N/m)x²

x² = (45 J)(2)/(540 N/m)

x = √(0.167 m²)

x = 0.4 m

Answer:

i would help but im just as confused. sorry.

Let the magnitude of FA be F and the magnitude of FB be f. Since both forces act in the same direction when both FA and FB point due east, the net force is: \(F _net = FA + FB\)  Therefore, the net force is given by the equation F _net = ma where m is the mass of the object and a is the acceleration.

\(Since a = 0.503 m/s², we have F _net = ma = 10.4 kg × 0.503 m/s² = 5.2312 N\) Next, when FA points due east and FB points due west, the net force acting on the object is :F _net = FA - FB Note that when FA and FB point in opposite directions, we must use the difference between the magnitudes of the two forces.

Also, the acceleration is due east, so it has no component along the north-south axis and so, we can equate the net force to ma as follows:

\(F _net = ma = 10.4 kg × 0.287 m/s² = 2.9808 NFA - FB = 2.9808 N...(1)FA + FB = 5.2312 N...(2)\)Adding the two equations, we have:

2FA = 8.212 N Dividing throughout by 2, we have: \(FA = 4.106 N\) Thus, the magnitude of FA is 4.106 N. Substituting the value of FA in equation (2) and solving for FB, we have:

\(FB = 5.2312 N - 4.106 N = 1.1252\) N Thus, the magnitude of FB is 1.1252 N.

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Answer:

The mass of the apple is 0.49kg

Explanation:

Potential energy=mgh

P=mgh

6=m×1.22×10

6=12.2m

divide both sides by 12.2

m=6/12.2

m=0.49kg

Yes, PNS system causes more frequent depolarizations to the SA (Sinoatrial) node.

The PNS (Parasympathetic Nervous System) is responsible for decreasing the heart rate. It does so by releasing acetylcholine, which stimulates the M2 muscarinic receptors found in the SA node. When acetylcholine binds to M2 receptors, it opens potassium channels, leading to hyperpolarization of the SA node cells.As a result, the pacemaker potential threshold increases and requires more time to reach the threshold for depolarization, thus reducing the heart rate. Therefore, by decreasing the potassium ion permeability of the ECF, it slows the heart rate, resulting in fewer depolarizations in the SA node, causing a lower heart rate.

In summary, the parasympathetic nervous system (PNS) causes more frequent depolarizations to the SA node. The PNS slows down the heart rate, but this does not mean that the pacemaker potential is reduced. Instead, the pacemaker potential is hyperpolarized, increasing the threshold for depolarization. Thus, fewer action potentials reach the threshold, and heart rate is decreased. So, the decrease in potassium permeability in the ECF and an increase in the parasympathetic nervous system causes hyperpolarization of the SA node and increases the threshold for depolarization. This, in turn, leads to fewer depolarizations in the SA node, causing a slower heart rate.

Therefore, it can be concluded that the PNS system causes more frequent depolarizations to the SA node and decreases heart rate by increasing the threshold for depolarization, which is accomplished by hyperpolarizing the pacemaker potential.

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Answer:

17N right

Explanation:

Because relative humidity is dependent on air temperature, it is generally higher in the cooler mornings and lower in the warmer afternoons.

This is because warm air can hold more water vapor than cool air, so as the temperature rises in the afternoon, the air has the capacity to hold more moisture. This means that the same amount of water vapor in the air will result in a lower relative humidity when the temperature is higher. Conversely, in the cooler mornings, the air has less capacity to hold moisture, so the same amount of water vapor in the air will result in a higher relative humidity.

It's important to note, however, that this pattern is not always true and can be affected by other factors such as wind, precipitation, and geography. Additionally, relative humidity is not the same as absolute humidity, which refers to the actual amount of water vapor in the air, regardless of temperature.

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Answer:

The correct option is;

The atoms and molecules of the liquid water are moving, while the atoms and molecules of the glass are not moving

Explanation:

Matter that exist in the liquid or gaseous state consist of molecules that move freely about in the entire containing medium for gas, while the molecules move freely  in the portion of the container occupied by the fluid in the case of liquid fluids

However, the molecules of a solid are fixed within the current shape of the solid and are only free to vibrate within a fixed location and the allow the passage of subatomic particles such as electrons

As such, the glass cup being a solid, consists of molecules fixed in space, while the liquid water consists of molecules which can translate within the portion of the volume of the glass filled with the water.

The plane's speed is 450 miles per hour, and the wind speed is 50 miles per hour. This is determined by solving the equations derived from the distances and times of the flight with and against the wind.

Let's assume the speed of the plane (without considering the wind) is P, and the speed of the wind is W.

When flying into a headwind, the effective speed of the plane is reduced by the wind speed. So the equation for the outbound flight is:

P - W = 2000 miles / 5 hours

P - W = 400 miles per hour (mph)  ---(Equation 1)

When flying with a tailwind, the effective speed of the plane is increased by the wind speed. So the equation for the return flight is:

P + W = 2000 miles / 4 hours

P + W = 500 miles per hour (mph)  ---(Equation 2)

Now we have a system of two equations (Equation 1 and Equation 2) with two variables (P and W). We can solve this system to find the values of P and W.

Adding Equation 1 and Equation 2 together, we eliminate the variable W:

(P - W) + (P + W) = 400 mph + 500 mph

2P = 900 mph

P = 450 mph

Substituting the value of P back into Equation 1 or Equation 2, we can solve for W:

450 mph - W = 400 mph

W = 450 mph - 400 mph

W = 50 mph

Therefore, the plane's speed is 450 mph and the wind speed is 50 mph.

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Answer:

your answer to your question is true

Yes, the thermal contact resistance at the interface will decrease as a result of the evacuation of air at the interface.

This is because the presence of air creates a barrier between the two surfaces that prevents efficient heat transfer. When the air is evacuated, the surfaces are able to make better contact and heat transfer between them becomes more efficient. Therefore, the thermal contact resistance decreases.

In mathematical terms, the thermal contact resistance (Rc) can be expressed as:

Where hc is the thermal contact conductance and A is the contact area.

When the air is evacuated, the thermal contact conductance (hc) increases, which leads to a decrease in the thermal contact resistance (Rc). So, in conclusion, the evacuation of air at the interface between two surfaces leads to a decrease in thermal contact resistance and an increase in thermal contact conductance, allowing for more efficient heat transfer between the surfaces.

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Absolutely, as a result of the air evacuation at the interface, the thermal contact resistance will decrease. This is because air between the two surfaces produces a barrier that obstructs effective heat transfer.

The surfaces may make better touch with one another and transmit heat more effectively when the air is evacuated. The thermal contact resistance consequently drops. Rc = 1/ (hcA), where hc is the thermal contact conductance and A is the contact area, is the mathematical formula for the thermal contact resistance (Rc).

Rc = 1/ (hcA)

The thermal contact resistance decreases when the air is expelled, which causes the thermal contact conductance (hc) to rise (Rc). In conclusion, it can be said that the evacuation of air at the boundary between two surfaces results in a reduction in thermal contact resistance and an increase in thermal contact conductance, enabling more effective heat transmission between the surfaces.

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Formula of

Line segment

is AB =

\(\sqrt{(x_{2} -x_{1} )^{2} } +\sqrt{(y_{2} -y_{1} )^{2} }\)

Line segment

is a part of line with definite length. It has two ending points whereas a line has no end points and extended infinitely in both the direction. Line which joins both ending points with possible shortest way is known as

Line segment

.

            A ______________________ B    

        (x₁,y₁)                                             (x₂,y₂)      

This line segment can be represented as \(\frac{}{AB} /\frac{}{BA}\). In other word we can say line segment is

subset

of line, so it contains all the points of line lying between both end point of segment. For shorter length it can simply measure by

ruler

. A bar (-) is always on top of its notation {\(\frac{}{AB}\)}.

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Formula of Line segment is AB =  \(\sqrt{(x_{2}-x_{1})^{2} } +\sqrt{(y_{2}-y_{1})^{2} }\)

Line segment

is a part of line with a definite length. It has two ending points whereas a line has no end points and extended infinitely in both the direction. Line which joins both ending points with possible shortest way is known as

Line segment

        A ______________________ B    

       (x₁,y₁)                                             (x₂,y₂)      

This line segment can be represented as\(\overline{AB}/\overline{BA}\) . In other word we can say line segment is subset of line, so it contains all the points of line lying between both end point of segment. For shorter length it can simply measure by ruler A bar (-) is always on top of its notation {\(\overline{AB}/\overline{BA}\)}.

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can u type in english?????

Some fossils provide evidence to suggest that earth's climate has changed over time, the information can scientists obtain from these fossils is a. water levels, b. temperatures, and c. ocean salinity

By studying the fossil record, scientists can see evidence of past climate shifts and use that information to make predictions about future changes. For example, the presence of fossils from tropical plants in areas that are now colder suggests that temperatures in those areas were once warmer. Similarly, fossils of marine animals that lived in shallow water suggest that sea levels were once higher in those areas.

However, while fossils can provide valuable information about past climate changes, they do not necessarily provide a direct link to the movement of continents or the cause of mass extinctions, which may have been influenced by a variety of factors. Overall, the study of fossils helps scientists to better understand the complex history of Earth's climate and the impact that human activities may have on future climate changes. So therefore the correct answer is a. water levels, b. temperatures, and c. ocean salinity.

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