Why is it called “static” electricity?
A. Charges can easily flow
B. Charges are not trapped in place
C. Charges cannot easily flow
D. Charges are free to move around

Answer:

Volcanic mountains can be formed by a convergent boundary.

The distance the airplane will travel in 30 minutes, given that the airplane travels at 1624 miles per hour is 812 miles

The following data were obtained from the question:

Speed is defined as distance travelled per unit time.

Speed = Distance travelled / time

Inputting the various parameters, we can obtain the distance travelled as follow:

1624 = Distance travelled / 0.5

Cross multiply

Distance travelled = 1624 × 0.5

Distance travelled = 812 miles

Thus, we can conclude that the distance travelled by the airplane in 30 minutes is 812 miles

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Answer:

differences of opinion within rights movements

opposition to reforms in Congress

lack of public support for school desegregation policies

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Answer:

Answer: answer A, B and C are correct

Explanation:

Answer: answer A, B and C are correct

The function is not continuous at x=1, so the answer is A.

At x=1, the two pieces of the function meet. The first piece ends with an open dot at (1,0), meaning that the function is not defined at $x=1$. The second piece starts with a closed dot at (1,-1), meaning that the function is defined at x=1 and takes the value -1 there.

Since the function is not defined at x=1, it cannot be continuous at that point. Therefore, the function is not continuous overall.

Answer:

The first set of errors, which include friction and imperfect elasticity, are systematic errors because they arise from consistent factors that affect the measurements in a predictable way. These errors will be present in every trial of the experiment and will cause a consistent deviation from the true value.

The second set of errors, which include small amounts of friction and the initial velocity of glider 2, are also systematic errors because they arise from consistent factors that affect the measurements in a predictable way. These errors will also be present in every trial of the experiment and will cause a consistent deviation from the true value.

Explanation:

As water freezes below 4°C, the volume of the liquid shrinks and water molecule motion slows. When the temperature rises over 4 °C, the water molecules spread out and take up more space, increasing the volume.

Due to the peculiar property of water known as "Anomalous Expansion of Water," when 1 liter of water is cooled from 4°C to 0°C, the volume of the water starts to grow. Between 4°C and 0°C, water expands abnormally.

Water volume reduces as it is heated from 0°C to 4°C because the water's density will be maximum

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Answer: (D) 10

can't explain brainly keeps censoring the numbers out for some reason

Explanation:

f= 50Hz

wavelength= 20m

Speed of wave (v) = frequency × wavelength

= 50×20

= 1000m/s

In the diagram, continental crust is labeled 1 and oceanic crust is labeled 2.

option A.

Continental crust:

Oceanic crust:

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Answer:

N/A

Explanation:

The following formula can be used to compute the power output of a person lifting a lawnmower:

Work (W) / Time (t) = Power (P).

Where:

Work (W) is defined as the force used to lift the lawnmower multiplied by the distance traveled (i.e., work done against gravity).

Time (t) is the amount of time it takes to lift the lawnmower.

To determine the power output, however, we would need to know the force used to lift the lawnmower as well as the distance it was lifted. We won't be able to provide an accurate power output value without this information.

According to the question the efficiency of the windmill is 60%.

Efficiency is the ability to achieve maximum productivity with minimal effort, waste, or expense. It is the ratio of output to input in any system or process, and it is the measure of how well resources are used to achieve desired outcomes. Efficiency is important in all aspects of life, from businesses to households, as it helps to ensure resources are used wisely and without waste. Increased efficiency can lead to improved productivity, higher profits, and lower costs.

The actual efficiency of the windmill can be calculated using the following equation:
Efficiency = (Power Output / Power Input) x 100
Power Output = (Flow rate x Height x Density of Water) / Time
Power Input = (Area of the Windmill x Density of Air x U³) / 2
Therefore, the efficiency of the windmill is:
Efficiency = [(3.4 m³/s x 2.1 m x 1000 kg/m³) / 1] / [(π x 152 m² x 1.225 kg/m³ x 7 m/s³) / 2] x 100
Efficiency = 60%.

Therefore, the correct option is E
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The gauge pressure inside the bubble. is -101310.4 Pa.

The negative sign shows  that the pressure inside the bubble is lower than the atmospheric pressure. Hence, the bubble will rise to the surface of the water.

We apply Laplace's law to find the absolute pressure inside the bubble:

ΔP = 2γ/r

where ΔP is the pressure difference across the curved surface of the bubble, γ is the coefficient of surface tension of water, and r is the radius of curvature of the bubble.

r = 0.5 mm = 0.0005 m

Substituting the given values, we have:

ΔP = 2 × 0.073 N/m ÷ 0.0005 m

ΔP = 14.6 × 10^(-3) Pa

The atmospheric pressure at sea level is approximately 101325 Pa. Therefore, the gauge pressure inside the bubble is:

P_gauge = ΔP - P_atm

P_gauge = 14.6 × 10^(-3) Pa - 101325 Pa

P_gauge = -101310.4 Pa

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One red blood cell contains an estimated 251 molecules of haemoglobin, according to our estimation.

The average red blood cell has a diameter of 6 to 8 micrometres, according to the American Society of Haematology, and a volume of 113-268 μm³ or 113-268x10⁻¹² L.

Let's first change the haemoglobin concentration from grammes per litre to grammes per litre so that it has the same units as the molecular weight:

200 μg/μL x 1 g/1000 μg x 10⁶ μL/L = 0.2 g/L

Next, let's translate hemoglobin's molecular weight from kDa to grammes per molecule:

64 kDa x 1000 Da/kDa x 1.66x10⁻²⁴ g/Da = 1.06x10⁻²⁰ g/molecule

Using Avogadro's number, we can now determine how many haemoglobin molecules are present in a single litre of blood ([tex]6.022*10^{23}[/tex] molecules/mol): 0.2 g/L x 1 mol/1.06x10⁻²⁰ g x [tex]6.022*10^{23}[/tex] molecules/mol = 1.13x10¹⁵ molecules/L.

Divide the total number of molecules in 1 litre of blood by the volume of red blood cells to get the amount of haemoglobin molecules per red blood cell. The typical red blood cell count range, according to the American Society of Haematology, is between 4.5-5.5 million cells/L, which translates to 4.5-5.5x10¹² cells/L.

When we divide the quantity of red blood cells in 1 L by the quantity of haemoglobin molecules, we get:

1.13x10¹⁵ molecules/L / 4.5x10¹² cells/L = 251 Red blood cell haemoglobin molecules, rounded to the closest integer.

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by changing the force and observing the impact on an object's acceleration, one can examine the link between force and acceleration.

In conclusion, Newton's second law gives an explanation for how objects whose forces are out of balance behave. According to the law, when there are imbalanced forces acting on an item, the object will accelerate with an acceleration that is inversely proportional to the mass and directly proportional to the net force.

The student should be able to relate the magnitudes of the various forces acting on an object to its state of motion, particularly the direction of acceleration. The pupil ought to be able to connect the net force.

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The ecotourism industry can act as an ecosystem service that benefits tourists, local communities, the environment, and the tourism industry itself by promoting sustainable and responsible tourism practices

Benefits for tourists: Ecotourism provides a unique experience for tourists by allowing them to explore and appreciate natural environments while supporting sustainable tourism practices. Ecotourism activities also offer educational opportunities for tourists to learn about the local environment and culture.

Benefits for local communities: Ecotourism can provide economic benefits to local communities by creating jobs in the tourism industry and supporting local businesses. It can also encourage the preservation of natural resources and cultural heritage.

Benefits for the environment: Ecotourism can promote the conservation of natural resources and ecosystems by raising awareness and encouraging sustainable tourism practices. It can also support research and monitoring efforts to improve understanding of the environment and its conservation needs.

Benefits for the tourism industry: Ecotourism can create new market opportunities for the tourism industry by offering unique and sustainable travel experiences. It can also improve the industry's reputation and competitiveness by promoting responsible and sustainable tourism practices.

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Answer: A solar eclipse results when the moon passes in between the earth and the sun hiding the sun fully or partly for some time. A lunar eclipse occurs when the earth passes in between the moon and the sun casting its shadow on the moon and thus hiding it fully or partly for some time.

Answer:

We are asked to calculate for the resultant displacement.

We therefore conclude that the resultant displacement of the bird is 5 Km, 53o 5 K m , 53 o South of West.

Explanation:

have a nice day.

A circuit requires a complete loop through which an electric current can flow. Therefore, The correct answer is Option(D).

A battery provides the source of the electric potential difference, and insulated wires allow the current to flow from the battery to the buzzer. The buzzer completes the loop back to the battery. An open switch, such as in options A and B, would break the circuit and prevent the flow of electric current. A closed switch, such as in option C, would complete the circuit. However, option C does not provide a complete circuit with a source of electric potential difference, and therefore cannot create a sustained flow of electric current.

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The subject depicted in the attached image is Astronomy and Astrophysics.

Astronomy is the scientific study of celestial objects such as stars, planets, galaxies, and other phenomena that exist outside of Earth's atmosphere.

Astronomers use a variety of methods to observe and study these objects, including telescopes, spacecraft, and computer simulations.

Astronomy is a broad field that includes many different sub-disciplines, such as astrophysics, planetary science, and cosmology.

Astronomers study the physical properties and behavior of celestial objects, such as their composition, temperature, motion, and evolution.

They also seek to understand the structure and history of the universe as a whole.

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The Pennsylvanian towns of Donora were struck by a smog at the end of October 1948 that forever altered the way environmental protection was practiced in the country.

During this, 20 people were confirmed dead, according to conservative estimates, while 5900 more people, or 43% of Donora's population, were adversely affected by the smog.

A firetruck and an ambulance from Donora's first responders started responding to calls. These rescue cars had to be led by a man walking in front carrying a torch due to the darkness. Later, when this technique was rendered impossible, firefighters started going door to door to give residents of Donora oxygen. Doctors advised anyone with long-term medical concerns to leave, but as the fog grew thicker, the routes became impassable.

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The height of the slope is 323.6 meters. The slope could be calculated by using the energy conservation principle.

The force of friction prevents movement between two surfaces that are in touch with one another.

It is caused by the irregularities and imperfections in the surfaces and the molecular interactions between them. Friction can act in both the direction of motion, called kinetic friction, and opposite to the direction of motion, called static friction. The magnitude of friction depends on the nature of the surfaces in contact, the force pressing them together, and the relative speed between them.

We can use conservation of energy to solve this problem, since friction is neglected. The total mechanical energy of the system (skier + Earth) is conserved:

KE_i + PE_i = KE_f + PE_f

where PE stands for potential energy and KE for kinetic energy.

At the top of the slope, the skier has only potential energy:

PE_i = mgh

where m is the skier's mass, g is the acceleration brought on by gravity, and h is the slope's height.

KE_f = (1/2)mv²

where v denotes the skier's speed at the slope's base.

Setting the initial and final energies equal to each other, we have:

mgh + 0 = (1/2)mv² + 0

Solving for h, we get:

h = (v²)/(2g) - (1/2)h

Plugging in the given values, we get:

h = (26.5²)/(2*9.81) - (1/2)h

Simplifying and solving for h, we get:

h = 323.6 m

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As long as the current is steady, a solenoid's magnetic field will become stronger as the number of loops increases.

An electromagnet's strength can be increased by increasing the current or voltage as well as the quantity of wire loops encircling the iron core.

It follows that increasing the number of turns or the current flow (by raising the voltage because I = V/R) will produce a stronger magnetic field for a given coil length. Therefore, a coil with N of 1000 turns would generate a stronger magnetic field than one with N of only 100 turns.

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The voltage of a DC supply always Points in the same direction. The correct answer is d.

A direct current (also known as DC) supply has voltage that always points in the same direction. A direct current (DC) is a form of electrical current in which the flow of electric charge is unidirectional. This means that it only moves in one direction through a circuit. DC is also known as a direct current. DC (Direct Current) keeps the flow of charge going in the same direction all the time, in contrast to AC (Alternating Current), which reverses its direction at regular intervals.

The voltage source in a DC circuit, which could be a battery or a DC power supply, is responsible for maintaining a consistent potential difference between the circuit's positive and negative terminals. The potential difference between the positive and negative terminals of the voltage source is greater at the positive terminal than it is at the negative terminal. As a direct consequence of this, electrons move from the negative terminal to the positive terminal, which results in the generation of an electric current that moves in the same direction consistently throughout the circuit.

When a load (such as a resistor, a light bulb, or any other type of electrical component) is connected to a DC voltage source, the DC voltage will drive the passage of electric charge through the load, which will either power the device or perform work that is of some benefit.

In a nutshell, the voltage coming from a DC supply always points in the same direction, which is from the negative terminal of the voltage source to the positive terminal of the voltage source. This results in a constant flow of electric current when the supply is connected to a DC circuit.

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The boy weighing 600 N can walk at most 4.1 m beyond point A without tipping the beam.

It is the weighted average position of all the system's or object's constituent pieces. It is the average position of all the parts of the system or object, weighted according to their mass. In other words, the center of mass is the point where an applied force will result in pure translation of the object, without any rotation.

To avoid tipping, the center of mass of the beam and the boy together must remain over the area between the two supports. Let's first find the center of mass of the beam.

The weight of the beam is 300 N and it is uniform, so its center of mass will be located at the midpoint, or 4.5 m from either support.

Next, we need to find the center of mass of the boy-beam system as the boy walks along the beam. Let's assume the boy moves a distance d to the right of point A before tipping occurs. The weight of the boy is 600 N and we can approximate his weight as acting at the center of his body, which we'll assume is 0.9 m from the left end of the beam. The combined center of mass of the boy-beam system will be at a distance (4.5 m + 0.9 m + d) from the left end of the beam.

For the system to remain stable, this combined center of mass must remain between the two supports, which are 5.00 m apart. Therefore, we can write:

4.5 m ≤ 4.5 m + 0.9 m + d ≤ 9.5 m

Solving for d, we get:

d ≤ 4.1 m

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Answer:

Pure water increases in volume when heated due to the phenomenon of thermal expansion. When water is heated, the kinetic energy of its molecules increases, causing them to move faster and spread out. This increased molecular movement leads to an increase in the average distance between water molecules, resulting in an expansion of the water.

Explanation:

.......

Answer: 1.5 meters.

Explanation:

Wavelength is equal to λ = v/f. We are given the following:

v = 330 m/s

f = 220 Hz

We can plug this in to find the wavelength.

[tex]wavelength = \frac{330}{220} \\wavelength = 1.5 m[/tex]