Answer:
The sample is about 34380 years old.
Explanation:
The amount of Carbon-14 mass diminishes exponentially in time, whose model is described below:
[tex]\frac{m(t)}{m_{o}} = e^{-\frac{t}{\tau} }[/tex] (1)
[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (2)
Where:
[tex]m_{o}[/tex] - Initial mass, in grams.
[tex]m(t)[/tex] - Current mass, in grams.
[tex]t[/tex] - Time, in years.
[tex]\tau[/tex] - Time constant, in years.
[tex]t_{1/2}[/tex] - Half-life, in years.
If we know that [tex]\frac{m(t)}{m_{o}} = \frac{1.5625}{100}[/tex] and [tex]t_{1/2} = 5730\,yr[/tex], then the age of the sample is:
[tex]\tau = \frac{5730\,yr}{\ln 2}[/tex]
[tex]\tau = 8266.643\,yr[/tex]
[tex]t = - \tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]
[tex]t = - (8266.643\,yr)\cdot \ln \frac{1.5625}{100}[/tex]
[tex]t \approx 34380.002\,yr[/tex]
The sample is about 34380 years old.
Chăn nuôi bò sữa ở trung du miền núi Bắc Bộ gần đây được phát triển mạnh do tác động chủ yếu của
Answer:
what that means I don't understand
Which of the following terms describes a simplification of a complex process that isolates certain factors likely to be important?
a. contour map
b. forcing factor
c. model
d. positive feedback loop
e. negative feedback loop
Answer: Model
Explanation:
Models are able to break down complex processes into the most important parts so that the process can be repeated over and over again with just those important parts.
Models are very important and useful to the advancement of life as we know it because they help us repeat processes that are needed to push development forward in just about every field and industry.
what are the examples of intensive subsistence Agriculture?
Answer:
There are two types of the intensive subsistence agriculture. One is dominated by wet paddy and the other is dominated by crops other than paddy, e.g., wheat, pulses, maize, millets, sorghum, kaoling, soya-beans, tubers and vegetables.
Which of the following is the most important factor when determining a safe speed?
Answer:
The most important factor that one should determine in safe speed on any given day is to be made aware of the conditions in terms of visibility. Example of these would be the darkness, rain, mist or fog.
g Although the Humid Continental and Marine climates are at similar latitudes, they have very different annual temperature ranges. What factor is responsible this difference
Answer:
nearness to sea or ocean
Explanation:
Presence of water body is the factor that is responsible for the difference in annual temperature although the Humid Continental and Marine climates are present at the same latitudes. Marine climates are located near the water bodies such as ocean or sea while on the other hand, Humid Continental climates are located farther from the water bodies such as sea or ocean.
Which of the following statements about the interaction of Earth's systems is true?
A. The interaction between Earth's systems is limited to a response to human activity.
B. The Earth's system interact using positive feedback only.
C. The Earth's systems interact using negative feedback only.
D. All of the Earth's systems interact with each other.
is there a big difference between european portuguese and brazilian portuguese than to europeans portuguese?
Answer:
Yes
Explanation:
-Accents
-Grammar and spelling
-Formal and informal speech
-Vocabulary
-Pronunciation
Answer:
They have different accents and they pronounce things differently, When and Where they were created. More different than Brazilian Portuguese.
Which of the following spheres of the Earth is most directly affected by earthquakes and volcanoes? O A. Atmosphere O B. Lithosphere O C. Biosphere O D. Hydrosphere
Why did cover crops fall out of fame in the 20th century?
Answer: The cover crops fell out in favor in the 20th century is because of the invention of synthetic fertilizers.
"Why Do We Study the Sun?" How does the Sun help to protect life on Earth?
Answer:
We study about the sun because
The sun is a normal star. It is much closer to us than any other star, and by studying the sun, we can therefore learn more about other stars. The better we understand other stars, the more we know about the Milky Way. From there we know more about other galaxies and in the end we learn more about the universe.
Explanation:
How does the Sun help to protect life on Earth?
It radiates light and heat, or solar energy, which makes it possible for life to exist on Earth. Plants need sunlight to grow. Animals, including humans, need plants for food and the oxygen they produce. Without heat from the sun, Earth would freeze.
Which accurately describes apartheid? O A. It prevented the white minority from having any political power O B. It ended in the late 20th century C. Nelson Mandela started it D. It created a homogenous society
Apartheid is a system of legalized racial segregation started by Nelson Mandela. Option (c) is correct.
What is Apartheid?Apartheid is a system of legally sanctioned racial segregation in which one racial group is denied political and civil rights.
According to the Rome Statute of the International Criminal Court, apartheid is a crime against humanity that is punishable by death.
The Afrikaans word “apartheid,” means “separating, setting apart,”. Separating people based on racial or ethnic characteristics is the basis of apartheid, a policy. Apartheid typically enforces division over physical spaces by isolating one segment of the population from the others, or prohibiting a group from entering certain places because they are members of a particular race or ethnicity.
Therefore, Option (c) is correct.
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you 4. List the changes that have improved the travelling in modern times.
Answer:
Affordable trains soon ruled the forte of long-distance travel. Jet services were introduced that could fly higher and faster. By the time the 2000s rolled around, commercial flights had transformed themselves into the primary option of travel. Now, each member of the family boasts of a car each for personal use.
Explanation:
Match the biome name in column 1 with the description in column 2.
Temperate forest
?
Giant vines
Boreal forest
?
Trees that lose leaves in
fall
.
Rain forest
?
Evergreen trees
1
Chaparral
?
Grasses and shrubs
Answer:
Temperate Forests ⇒ Trees that lose leaves in fall
Here trees change their behavior every season to survive the cold. Their most distinguishing feature is how their leaves change color in response to the season and in the fall, they shed their leaves.
Boreal Forests ⇒ Evergreen
Boreal forests are the largest forest areas in the world. Areas tey cover are in Canada, Russia and Alaska and on account of being able to survive the cold weather, they are evergreen.
Rain Forest ⇒ Giant Vines
Rain forests have a lot of canopy like trees which blocks sunlight for other plants. These plants respond by using large vines to reach sunlight.
Chaparral ⇒ Grasses and Shrubs
These have the shortest and least numerous trees of the bunch. There are also a lot of grasses and shrubs. You will find these in the California.
IN North America, a winter weather change that might be associated with large amplitude Rossby waves is
Answer:
A jet stream that alternates between hot and cool periods.
Explanation:
Winds typically travel at the very same latitudes, but Rossby waves occur when winds shift it into hurricane pattern. The Rossby waves go in a north-south direction and then return again. Whenever the Rossby waves' breezes swing up, they transport warm air first from tropical to the northern, while when they swing down, they transport cold air from either the Arctic to the south, resulting in alternating warm and cold spells.
What should you do if you run aground and your boat has serious damage?
1.Don't put the boat in reverse. Instead, stop the engine and lift the outdrive.
2.Shift the weight to the area farthest away from the point of impact.
3.Try to shove off from the rock, bottom, or reef with a paddle or boathook.
4.Check to make sure your boat is not taking on water.
#BRAINLEST LOVE❣️If a boat sustains serious damage, it is important to prioritize safety and take immediate action to ensure the well-being of everyone onboard.
Determine the extent of the damage and evaluate the immediate risks. If there is a threat to the safety of passengers or if the boat is taking on water, take immediate action to address those concerns.
Use marine VHF radio to call for help. Contact the nearest Coast Guard or marine authorities and provide them with your location, the condition of the boat, and any assistance you may require. If don't have a VHF radio, use any available means of communication to seek assistance.
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Ozone pollution would be most favored in:_________
a. sunny climates during the winter when volatile organic compounds can react with NO.
b. sunny climates in summer when coal is burned to generate electric power.
c.sunny climates during the summer when volatile organic compounds can react with NO.
d. sunny climates in winter when coal is burned to generate electric power.
Answer:
b. sunny climates in summer when coal is burned to generate electric power.
Do you agree that in Pakistan land is ploughed by wooden ploughs drawn by cattle,
threshing is done by animals, winnowing is done by hand and farm products are
consumed by the family? Explain in your words with practical example
Answer:
Yes definitely Pakistan is a poor country while India is rich and prosperous
Make me brainliest
State of high development of some countries is a cause of the under development of others. Discuss
Answer: exploitation
Explanation: points you can write about :
unfair trade - cash crops. poorer countries trade raw materials, it gets manufactured and sold back at a higher price
former colonies
Frank's dependency theory, the core exploits the periphery
you could also argue that the statement isn't true, geographical location can impact development. e.g. mountains and being landlocked makes it hard to trade.
climate can impact crops, regular extreme weather events make it hard to develop.
hope this helped!
why does the torrid zone receives maximum amount of heat
The sun rays directly comes and faces the area between the tropic of Cancer and tropic of Capricorn. It is the torrid zone. Hence, the torrid zone receives maximum amount of heat.
With most hotel executives having recognized that the demand for green hotels has reached a tipping point, the supply of green hotels is likely to grow rapidly in the upcoming years (Stewart, 2012). - plagiarized; not correctly acknowledging direct quotations
Answer:
.
Explanation:
A three-story building had its lightweight roof uplifted. Hint: low-rise three-story, non-residential, roof uplifted completely, but no damage to walls. a. Damage Indicator Number:_________b. Degree of Damage:_________ c. Expected Wind Speed:_________ d. EF-scale Rating: _______
Answer:
a). 2
b). Moderate
c). 73-112 mph
d). F1
Explanation:
A Fujita scale is a scale that is used to determine the rating for the tornado intensities. It is used to measure the intensity of the tornado and provides a rating based on the damages made by the tornado on the human built structures and other vegetations.
The rating is based on the wind sped and the damages caused by the winds. When the damages caused by a tornado is surveyed, it is compared to the lists of Damage Indicators and the Degree of Damage which helps to estimate the range of the speeds of the tornado and an EF scale rating is provided accordingly.
In the context, It is given that the lightweight roof of a three storied building was uplifted. It was a non residential low rise three story building whose roof was uplifted completely but there was no damages made to the walls of the building.
So according to the EF scale, it provided a rating of :
Damage Indicator Number : 2
Degree of Damage : Moderate
Expected Wind Speed : 73-112 miles per hour
EF-scale Rating : F1
Workers at mission control who support astronauts are called ---.
A
flight controllers
B
mission experts
C
support officers
D ground-crew members
Answer:
Explanation:
Flight controllers deal with the flight of spacecraft while mission experts handle specific mission tasks. I am not sure who support officers are but ground-crew members support astronauts from getting them clothes and a phone call with their families. So the answer is D.
Question 1
Modern scientific theories are NOT:
simple
testable
continuously tested.
perfect
elegant
Answer:
perfect
Explanation:
by elimination:
modern scientific theories are testable n continuously tested
they can be simple n elegant
but they are NOT perfect
Answer:
Explanation:
Modern scientific theories are NOT: simple, elegant, nor perfect.
what the volume of a sphere with a diameter of 21.4 dm?
Answer:
V ≈ 4577.204 cm^3
Explanation:
Use the volume formula V=4/3πr^3 to find the volume. Since you need the radius but are given the diameter, divide it by 2 to get half.
21.4/2 = 10.7
Now plug that into the formula and solve:
V=4/3πr^3
V=4/3π(10.7)^3
V= 4/3π(1,092.7272)
V= 4/3 * 3432.903
V= 4 * 3432.903/3
V = 13731.614/ 3
V ≈ 4577.204 cm^3 or whatever unit is stated.
Select the correct answer.
The correlation between the number of hours Brad studies and the grades he gets is 0.8. Which phrase best describes the correlation between the number of hours Brad studies and the grades he achieves?
Answer: strong positive correlation
Explanation:
A positive correlation exists when the correlation coefficient that we've is greater than 0. This means that both variables that are given move in the same direction.
Since the correlation between the number of hours Brad studies and the grades he gets is 0.8, it means that there's a strong positive correlation due to the fact that the value is close to +1.
This means that the number of hours that Brad studied is a good predictor of
the grade that he gets in his examination but it's not perfect.
similarity between weathering and mass wasting
Answer:
Both processes occur in place. No movement is involved in weathering. As soon as a rock particle (loosened by one of the two weathering processes) moves, we call it erosion or mass wasting. Mass wasting is simply movement down slope due to gravity.
Sendo assim, podemos afirmar que
população do Brasil é
A rectangle and a square have the same perimeter, the rectangle with a length 8cm has an area of 32cm.find the length of each side of the square
The length of one side of square is 20
n 9
What should you check to decide
a speed is safe for your boat?
A
operator's age and experience
B
wind and water conditions
С
vessel's capacity plate
D
speed of other vessels
Answer:
B
wind and water conditions
It is very important to check so as decide if a speed is safe for your boat Ed. What one should check to decide is the vessel's capacity plate.
For one to have a safe operating speed, the operator must take some factors into account. This includes visibility, traffic density; how one can maneuver the vessel etc.
There are some important safety information that is found on a boat's capacity plate and this pertains to the maximum weight and/ or number of people the boat can carry safely. With this one can know if a specific speed capacity is okay.
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Seawater is highly saline, which means it contains large amounts of dissolved salt. When seawater freezes and icebergs
form, the water in the iceberg doesn't take the salt with it. What effect will this phenomenon have on the concentration of
salt in the water around the iceberg?
Answer:
Because the amount of liquid water decreases and the amount of dissolved salt remains constant, the concentration of salt in the liquid water around the iceberg will increase.
Explanation:
