A circular Flower bed is 20 m in diameter and has a circular sidewalk around it that is 3 m wide. Find the area of the sidewalk and square meters.
Answers
Answer: [tex]216.76 m^{2}[/tex]
Explanation:
Assuming the shape of the circular flower bed with its sidewalk is as shown in the figure, where the flower bed is the inner white circle and the sidewalk is the black part; we have to circles, hence two areas:
[tex]A_{1}=\pi R^{2}[/tex] (1)
And:
[tex]A_{2}=\pi r^{2}[/tex] (2)
Where:
[tex]A_{1}[/tex] is the area of the outer circle
[tex]A_{2}[/tex] is the area of the inner circle
[tex]r=\frac{diameter}{2}=\frac{20 m}{2}=10 m[/tex] is the radius of the inner white circle
[tex]R=10 m+ 3 m=13 m[/tex] is the radius of the outer black circle
So, the area of the sidewalk will be:
[tex]A=A_{1}-A_{2}[/tex] (3)
Substituting (1) and (2) in (3):
[tex]A=\pi R^{2}-\pi r^{2}[/tex] (4)
[tex]A=\pi (R^{2}-r^{2})[/tex] (5)
Solving with the given data:
[tex]A=\pi ((13 m)^{2}-(10 m)^{2})[/tex] (6)
[tex]A=\pi ((13 m)^{2}-(10 m)^{2})[/tex] (7)
Finally:
[tex]A=216.76 m^{2}[/tex] This is the area of the sidewalk
Related Questions
2. What facilitated the variety of species on earth?
Answers
Answer:
evelution
Explanation:
Explain why the composition and liquid state of the outer core are necessary for creating Earth’s magnetic field?
Answers
The outer core's composition and liquid state are required for the creation of the Earth's magnetic field because convection currents in the liquid iron generate electric currents, which in turn form magnetic fields.
What is Earth’s?The term Earth refers to the planet of the solar system. The Earth is the only planet where life is possible for living things' in reason of gravitational force. The Earth's main elements are life, air, water, and land. The Earth's planet radius is 3,959 miles. The Earth is only for oxygen.
According to the Earth's magnetic field on the composition and liquid state of the outer core, the liquid iron in the outer core is an efficient electrical conductor and provides the electrical currents that drive the magnetic field. The seismic waves produced by earthquakes supply scientists with a variety of measurable evidence that supports the hypothesis of the Earth's outer core.
As a result, the significance of the Earth’s are the aforementioned.
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List and explain four human activities that contribute to soil erosion
Answers
Answer:
1. Deforestation 2. Overgrazing 3. Overcropping 4.Construction
Explanation:
Soil erosion is exacerbated by human activities like construction, logging, agricultural practices including overgrazing and leaving fields bare, and recreational interests such as hiking and off-road vehicle use. These activities remove vegetation cover, making soil more prone to erosion by water and wind.
Soil erosion is a significant environmental issue exacerbated by various human activities. Four main human actions that contribute to this include:
Construction: This activity often involves stripping the land of vegetation, which increases the vulnerability of soil to erosion by water and wind.Logging: Trees stabilize the soil with their root systems. When trees are removed during logging, the soil is more susceptible to being carried away by erosive agents.Agricultural Practices: Methods such as overgrazing by livestock and leaving fields bare without cover crops result in the loss of natural vegetation that protects soil from erosion.Recreation: Recreational activities like hiking and off-road vehicle use can damage soil and vegetation cover, leading to increased soil erosion.It is crucial to adopt practices that minimize soil erosion, such as terracing, strip cropping, and replanting vegetation, to maintain soil health and prevent further degradation.
Nord, Greenland
Paris, France
New York, NY
Quito, Ecuador
Cape Town, South Africa
Sydney, Australia
1. Which cities have summer in July?
2. Which cities only have 2 seasons?
3. Which cities are relatively warm all year round?
4. Which cities have 24 hrs of daylight during the summer?
5. Which cities have summer in January?
Answers
Answer:
1 - new york,ny, paris, france, quito, ecuador nord, greenland
2 - quito, ecuador,
3 - quito, ecuador, sydney australia
4 nord, greenland, cape town south africa,
5 - cape town, south africa, sydney australia,
Explanation:
In the Northern Hemisphere, July is a summer month for cities like Paris, New York, and Nord, Greenland. Quito, Ecuador, close to the equator, is generally warm year-round with two seasons, wet and dry. Summer in the Southern Hemisphere, including cities like Sydney, Australia and Cape Town, South Africa, is in January.
Explanation:In July, the cities that have summer are Paris, France; New York, NY; and Nord, Greenland because these cities are located in the Northern Hemisphere where summer occurs in July. Cities like Quito, Ecuador, near the equator, have relatively consistent weather throughout the year, essentially having two seasons - the wet and dry season. However, they can still be relatively warm all year round. Nord, Greenland experiences 24 hours of daylight during the summer due to its placement in the Arctic Circle. In contrast, cities like Sydney, Australia and Cape Town, South Africa have their summer in January because they are located in the Southern Hemisphere.
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Which of the following igneous rock textures is most likely to have formed below Earth's surface?
glassy
aphanitic
phaneritic
Answers
Phaneritic
Explanation:
Igneous rock textures most likely to have formed below the earth's surface are termed phaneritic textures.
A rock texture is the arrangement of minerals in a mass of rock body.
During crystallization of melt, different texture attributes can be used to delineate the environment where a rock forms.
Rocks that cools beneath the earth crust are called intrusive igneous rocks. They allow for enough time for mineral grains to grow due to little nucleation centers forming at the same time.
Big grains of minerals gives the rock mass a coarse texture said to be phaneritic.
Extrusive and volcanic rocks usually forms glassy and aphanitic textures.
Select all the correct answers.
Which statements are true of a white dwarf?
It has a red shell.
It is the result of the core collapse of a low-mass star that sheds its outer layers.
It emits massive amounts of light compared with other stars.
It strongly attracts all matter or energy that comes near it.
It cools down to become a black dwarf.
Answers
Answer:
It is the result of the core collapse of a low-mass star that sheds its outer layers. it cools down to become a black dwarf.
Explanation:
The true statements about a white dwarf are:
It is the result of the core collapse of a low-mass star that sheds its outer layers.It cools down to become a black dwarf.What are the characteristics of a white dwarf?A white dwarf is formed from the remnants of a low-mass star after it has undergone core collapse and shed its outer layers. As it continues to radiate its residual heat, it cools down over billions of years until it eventually becomes a black dwarf, a cold, dark celestial object.
The concept of a white dwarf emitting massive amounts of light compared to other stars is not accurate, and the idea that it strongly attracts matter or energy that comes near it is also not true.
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Carlos is having a party in his backyard. He decides to put up a canopy from each corner of his
deck in case it rains. The deck (and the canopy) is in the shape of a quadrilateral.
1) Draw an x-axis and a y-axis on your graph paper. Label each axis. (5 pts)
2) Plot the following points on the graph paper and label each point.
A (-10, 3)
B) (0, 9)
C) (12,5)
D (-4,-7).
These are the corners of his deck. (20 pts)
3) Connect these points with a ruler to make the quadrilateral that is his deck. (5 pts)
After the canopy is up, Carlos' sister, Mireya, wants to hang some party lights underneath the
Cho will ice the midpoints of each side of the canopy. You must graph each midpoint
Answers
Answer:
B
Explanation:
I don't recommend this because i guessed.
Three ways Israel is different from other countries in the Middle East.
Answers
The establishment of Israel had a significant impact on the Middle East. Once Israel declared sovereignty in 1948, armed conflict began almost immediately. Arab countries resented the creation of the state, supporting the rights of Palestinians in the region. Israel was forced to defend itself against its neighbors.
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When did the build up of three oxygen create our ozone layer
Answers
Answer:
The build-up of three oxygen created our ozone layer around two billion years ago.
Explanation:
The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth. The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun. The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.What is one form from which a rock can change and one form into which it can change?
Answers
Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.
The parent rock can be either sedimentary, igneous, or even another metamorphic rock. The word "metamorphic" comes from Greek and means "To Change Form"
One form that a rock can change from is igneous rock to sedimentary rock.
How can rocks change ?Igneous rocks are formed from molten rock that cools and solidifies. Sedimentary rocks are formed from the accumulation of sediments, which are pieces of rocks, minerals, and other materials.
Another form that a rock can change from is sedimentary rock to metamorphic rock. Metamorphic rocks are formed when sedimentary rocks are subjected to heat and pressure.
Igneous rock can also change to metamorphic rock without going through the sedimentary rock stage. This can happen when igneous rock is subjected to heat and pressure.
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Each cycle of spreading and intrusion of magma during seafloor spreading results in ____.
magnetic reversals
new ocean crust
subduction
plates colliding
Answers
Answer:
new ocean crust
Answer:
B
Explanation:
The Yangtze and Yellow Rivers are located in this country.
Japan
Myanmar
China
India
Answers
Answer:
The Yangtze and Yellow Rivers are located in the CHINA
Answer:
The answer is C - China
Explanation:
[tex](4 + 5) + (5 + 6)[/tex]
Answers
Explanation:
[tex](4 + 5) + (5 + 6) \\ = 4 + 5 + 5 + 6 \\ = 20[/tex]
Which of the following is NOT a skill scientists use to learn about the world?
a. Predicting
C. Inferring
b. Observing
d. Scientists use all of the above skills
Please select the best answer from the choices provided
O A
ooo
Answers
The correct answer to the student's question is d. Scientists use all of the above skills, which include predicting, inferring, and observing, as part of the scientific method and inquiry process.
Explanation:The skill that is NOT used by scientists to learn about the world is:
PredictingInferringObservingScientists use all of the above skills
The correct answer is d. Scientists use all of the above skills. Predicting, inferring, and observing are all essential skills utilized in the process of scientific inquiry. For instance, observing is a fundamental part of the scientific method, as it involves gathering data and evidence. Inferring allows scientists to make logical conclusions based on their observations. Predicting involves making educated guesses about future events or outcomes based on current evidence and understanding.
It's important to note that the scientific method includes steps like forming a hypothesis, which is essentially a prediction that can be tested, and running experiments to infer causality. Moreover, the ability to predict is crucial for developing new theories and models in science.
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Factors leading to unsettled relations among European nations included everything except:
A-nationalism
B-conflicts over colonies
C-United States interference
D-military build-ups
Answers
Answer:
C-United States interference
Explanation:
Hawaii has a warm, wet, tropical climate. Which of these is most likely to break down newly formed rock in Hawaii?(1 point)
Answers
Answer:
root wedging
Explanation:
Due the tropical climate, there will be presence of trees which will aid rooting wedging in Weathering of rocks
What caused many Arabs to move through the Middle East in the 600s CE?
Answers
During the 600s CE, an Arab expansion took place all over the Middle East. During these years, Muslim conquests became common, and this led to the establishment of unified Arabic empires, or "caliphates."
Answer:
Religion is why many Arabs moved to the Middle East.
Explanation:
Question 3 of 5
2 Points
Which force is a contact force?
O
A. Leaves falling
B. A bicycle braking
C. A magnet pulling
D. Lightning forming
Answers
Answer:
a bicycle braking
Explanation:
got it right on my test
From the standpoint of geography, your mental map is your:
Answers
Answer:
From the standpoint of geography, your mental map is your visualization of the spaces you come across.
Explanation:
In the sphere of behavioural geography, the phrase "mental map" stands for a person's viewpoint or perception of his/her area of interaction. Though it might seem like a subject matter that would be studied by social sciences fields, it is mostly studied by modern-day geographers. Mental maps are important as they provide people with crucial means of making sense of the world. They also help in storing and recalling information about the patterns of the Earth's physical and human characteristics. Example: Picturing one's neighbourhood, one can visualize where the roads go and where the houses are located including landmarks.
Answer:
Internal picture of the space that you know.
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Have advances in agriculture improved the human condition, or have the benefits of the Green Revolution been limited to a few geographic regions?
Answers
Answer:
Yes, the benefits of the Green Revolution have been limited to a few geographic regions only.
Explanation:
In countries like the United States, Argentina, India, etc., the Green Revolution changed the picture of how agriculture yielded output by multiplying it owing to the advances in the methods of doing farming. Mechanized farming, hybridization of seeds, chemical fertilizers, etc., made farming more profitable in some parts of the world. On the other hand, the phenomena of the Green Revolution failed to work in most African and West Asian countries.Final answer:
The Green Revolution significantly increased global food production and reduced famine by introducing high-yield crop varieties and advanced farming techniques. However, it also led to environmental damage, social inequalities, and a dependency on unsustainable agricultural inputs. Critics emphasize the importance of smallholder farmers and call for a shift towards more sustainable practices.
Explanation:
Have advances in agriculture improved the human condition, or have the benefits of the Green Revolution been limited to a few geographic regions? Advances in agriculture, particularly those stemming from the Green Revolution, have had a profound impact on global food production, leading to significant increases in crop yields through the development of high-response varieties (HRV) of essential crops, expanded irrigation infrastructure, and the use of artificial fertilizers and pesticides. While these innovations have undoubtedly contributed to the reduction of famine and helped regions like China and India achieve self-sufficiency in basic foods, they have also led to several unintended consequences.
Increased reliance on chemical inputs and high-yield varieties has contributed to environmental degradation, loss of agricultural biodiversity, and has exacerbated social inequalities, particularly in developing regions. The rapid adoption of western, capital-intensive farming methods has favored large-scale operators and agribusinesses, leading to a widening gap between rich landlords and landless peasants, and escalating farmer debts in countries like India. Critics argue that the real backbone of global food security remains in the hands of smallholder and subsistence farmers, who are said to feed the majority of the world's population despite the focus on industrialized agriculture.
The Earth is tilted 23 1/2 degrees on its axis. The direction of the Earth's tilt does not change throughout its orbit.
At which position of Earth is it summer in the Northern Hemisphere?
Answers
Answer: B
Explanation: It is B because the earth is pointing towards the sun.
In the Northern Hemisphere, summertime is at point X of Earth. Therefore, choice (B) is right.
What do you know about the Northern Hemisphere?Just above the equator, trade winds blow from east to west. Due to the Coriolis effect, surface water is drawn along by the winds, forming currents that move westward.
The currents then turn to the right and move in a northerly direction. At roughly 30 degrees north latitude, a different set of winds, the westerlies, force the currents back to the east, creating a closed clockwise circle.
its surface is 60.7% water, as opposed to the Southern Hemisphere's 80.9% water, and it is home to 67.3% of the planet's land.
The Northern Hemisphere of the planet, which also includes nearly the whole continent of Asia, about two thirds of Africa, and a small portion of South America, is where the continents of Europe and North America are totally located.
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Sometimes water scarcity is caused by human action. Describe an example of where this has occurred.
Answers
Answer:
Explanation:
Water scarcity already affects every continent. Around 1.2 billion people, or almost one-fifth of the world's population, live in areas of physical scarcity, and 500 million people are approaching this situation. Another 1.6 billion people, or almost one quarter of the world's population, face economic water shortage (where countries lack the necessary infrastructure to take water from rivers and aquifers).
Water scarcity is among the main problems to be faced by many societies and the World in the XXIst century. Water use has been growing at more than twice the rate of population increase in the last century, and, although there is no global water scarcity as such, an increasing number of regions are chronically short of water.
Water scarcity is both a natural and a human-made phenomenon. There is enough freshwater on the planet for seven billion people but it is distributed unevenly and too much of it is wasted, polluted and unsustainably managed.
Human action often contributes to water scarcity through over-extraction of groundwater, often in agriculture. Rapid population growth, urbanization and industrialization also increase the demand for fresh water supply. An example is Cape Town, where rapid urbanization and climate changes led to a severe water crisis.
Explanation:Indeed, human action can significantly contribute to water scarcity. One common example can be seen in areas where there is excessive groundwater extraction. Particularly in agriculture, farmers may use sophisticated technology to pump water from aquifers more rapidly than it can be naturally replenished. This is known as over-extraction or 'mining' of water. Over time, this leads to a reduction in the water table, which in turn causes water scarcity. Moreover, population growth, urbanization and industrialization also increase the demand for freshwater and strain supplies. For instance, in cities like Cape Town, South Africa, rapid urbanization along with climate change had led to a severe water crisis. Thus, human activities are directly associated with water scarcity in many parts of the world.
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Why is demand for water rising in india
Answers
Answer:
The demand for water is rising in india as there a lot of unclean and unsafe water to drink, there is lack of government attention and maybe because it is realy hot there that there has been less rainfall and most water has evaporated
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Which of the following is not an example of a study within human geography?Giving an address, such as “1000 Elysian Park Avenue, Los Angeles, CA,” is an example of describing the __________ of a place.
Answers
Answer:
absolute location
What techniques are engineers using to reduce earthquake damage in Haiti ?
What other careers would help scientists predict or prepare for earthquakes ?
Answers
Final answer:
Techniques to reduce earthquake damage in Haiti include retrofitting, using resistant construction codes, lightweight materials, and flexible designs. Seismologists, geophysicists, and urban planners work with engineers to predict and prepare for earthquakes. Research like Dr. Hildebrandt's also plays a role in informing global disaster response strategies.
Explanation:
Engineers have employed various techniques to reduce earthquake damage in Haiti post the devastating 2010 earthquake. These measures include retrofitting existing structures, using more earthquake-resistant construction codes, incorporating lightweight materials, and implementing flexible building designs that can withstand seismic forces. Engineers are also working on public education to ensure that people understand the importance of building standards.
Predicting and Preparing for Earthquakes
Seismologists, geophysicists, and urban planners are among the professionals collaborating with engineers to predict and prepare for earthquakes. They employ technologies like seismographs to monitor earth movement and develop early warning systems that can alert populations before an earthquake hits, saving lives and reducing damage. Furthermore, government initiatives and individual preparedness plans can significantly reduce the impact of large earthquakes.
Global Collaboration and Research
Scientists worldwide, including researchers like Dr. Kristine Hildebrandt, conduct studies that may inform global disaster response strategies. Learning from past events allows for better preparation and understanding of the changes needed to improve earthquake resilience. Such collaborative research and exchange of knowledge are critical in designing infrastructure and response plans to minimize earthquake damage globally.
In order to capture water to use for irrigation humans often
A.) Over fish a river system until a speices is ectinct
B.) Build home around a river
C.) Build dams
D.)Burn fossil Fuels
Answers
Answer:
c
Explanation:
--_--
y = X + 4 Y = -2x -2
Answers
The answer is x = -2 and y = 2.
Explanation:
The first equation can be written as x - y = -4The second equation can be written as 2x + y = -2step 1 :
Solving by elimination method to find the value of x and y,
x - y = -4
2x + y = -2
3x = -6
step 2 :
x = -6/3 = -2
The value of x is x = -2
step 3 :
Substitute x = -2 in any of the given equations.
⇒ y = x + 4
⇒ y = -2 + 4
⇒ y = 2
When two air masses with different temperatures or humidity levels meet, they do not immediately mix or blend. Instead a line or boundary forms between them. This boundary is called a...... Question 5 options: continental polar maritime polar maritime tropical front
Answers
When two air masses with different temperatures or humidity levels meet, they do not immediately mix or blend. Instead a line or boundary forms between them. This boundary is called a......front
Explanation:
Due to the different properties, especially temperatures. The less-dense air mass tends to rise while the denser tends to dive at the front causing turbulence. There are four main types of fronts;
Cold front – bring rainfall and thunderstormswarm front – associated with less intense weatherOccluded front – when a warm air mass is in between two cool air masses Stationary front - can be warm or cold but barely movesTwo air masses with different temperatures or humidity levels meet, they do not immediately mix or blend. Instead, a line or boundary forms between them. This boundary called a front.
What is Front?A front is a weather group that is the line separating two different types of air.One type of air usually concentrated than the other, with different temperatures and different levels of humidity. 7 – 12 Earth Science, Geography, Physical Geography.Due to the different properties, specially physical property. The less-dense air mass runs to rise while the heavier tends to dive at the front causing turbulence.The four principal types of fronts are:Cold front – bring rainfall and electric stormWarm front – linked with less big weatherOccluded front – when a warm air mass is in between two cool air groupsStationary front—can be warmed or cold, but just movesTherefore, Front means Two air masses with different temperatures levels meet, they do not immediately mix. Instead, a line or boundary forms between them.
Hence, the option [D] is correct.
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what role does gravity play in a hydroelectric dam's ability to produce energy?
if anyone's knows the story hydroelectric power by the United states geological survey please tell me what would be 2 good details thank you. please dont say anything mean in your answers.
Answers
Answer:
An opening in the dam uses gravity to drop water down a pipe called a penstock. The moving water causes the turbine to spin, which causes magnets inside a generator to rotate and create electricity
Explanation:
The role of gravity in a hydroelectric dam's ability to produce energy is that it allows the water to fall through the penstock inside such dam.
What is gravity?The naturally occurring gravitational force of the Earth to pull things and objects towards its surface, is known as the force of gravity.
Hence, the significance of gravity is aforementioned.
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How many “plates” total are there on earth