Answer: 9 grams left After 45 days
Explanation:
Given,
Half life of sodium-24 = 15 days
Measured Sample = 72 grams
After 45 days how many grams remains is :
Number of half lives = time elapsed / half life
Number of half lives = 45 days / 15 days
Number of half lives = 3
At time zero total amount = 72 g
After first half life = 72 g/ 2= 36 g
At 2nd half life = 36 g/2 = 18 g
At 3rd half life = 18 g/2 = 9 g
Hence After 45 days 9 grams left.
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I don't really need help but I'm putting it here just incase
Answer:
ok ig when u need help i'll help u
Explanation:
How can a charged balloon attract a wall without any contact?
A) The positive charges of the uncharged wall move to the outside.
B) The wall changes shape and the positive charges move to the inside.
C) The negatively charged balloon repels and moves away from the wall.
D) A positive charge in the balloon attracts the negative charges in the wall.
The diagram shows different forms of thermal energy transfer.
What do the flames below the pot represent?
a
conduction
b
convection
c
insulation
d
radiation
Answer: my educated guess is D. radiation
Answer:
b
Explanation:
just wondering...
What is the most likely adaptation for a rabbit which once lived in the snow but now lives in shrubs and rocks due to increased global temperatures?
They will see an increase in fur production
They will become better swimmers
They will grow longer ears
Their coats will become darker due to natural selection
The most likely adaptation of a rabbit that moves from snow to shrubs and rocks would be a darker coat color due to natural selection.
What is adaptation?It is the physiological and or morphological changes that occur in organisms that enable them to survive in their environments.
A rabbit that moves from living in the snow to living in shrubs and rocks does not need to produce more fur to survive as the temperature will be higher than in the snow.
Also, such a rabbit does not need to become a better swimmer since it is not living in the water. A longer ear also has no bearing in adapting it to its new environment.
A darker coat color, however, will conceal it from predators and give him a selection advantage.
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Use the dichotomous key to identify this animal.
Which animal is shown?
an orangutan
a lemur
a gibbon
a chimpanzee
Answer:
A lemur
Explanation:
It is because in the scale if it had a tail it went straight to lemur.
imagine that you live in a city near a large river you are part of a group that is studying the environmental impact of switching your City from fossil fuels to hydropower
which two issues are possible consequences that you should consider
A: harm to fish and other organisms in the river
B: danger to birds that live in your region
C: decrease in carbon dioxide production
D: toxic waste created by nuclear reactions
Answer:
C: decrease in carbon dioxide production A: harm to fish and other organisms in the river
Explanation:
You observe that the hair on your head stands up when a charged balloon is brought near without touching your head. Based on this observation, you write down the following question and steps to an experiment.
Can two charged objects be attracted to each other without touching?
Step #1: Bring the charged balloon 10 cm from your head.
Step #2: Charge the balloon by rubbing it against a cloth.
Step #3: Record your observation.
Step #4: Bring the charged balloon 5 cm from your head.
Step #5: Record your observation.
What revision could you make to improve the experiment?
Remove the fifth step, you do not need to make multiple observations in an experiment.
Reverse the first two steps so that you charge the balloon before you bring it close to your head.
Reverse the second and third steps so you record your observation before you charge the balloon.
Swap steps two and four, you do not need to charge the balloon until the end of the experiment.
Answer:
yes it can be attracted without touching The electric force is a non-contact force. Any charged object can exert this force upon other objects - both charged and uncharged objects.
Explanation:
Answer:
The answer is B! (Reverse the first two steps so that you charge the balloon before you bring it close to your head)
Explanation:
I did the exam and got it correct!
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What are some problems associated with the use of nuclear fission to supply energy needs?
Answer:
It is hard to spilt a nucleus.
possibly the biggest concern among nuclear energy advocates is the environmental impact of uranium as a fuel source. A typical nuclear power plant generates about 20 metric tons of used nuclear fuel per year. The problem is that this spending fuel is highly radioactive and potentially dangerous.
Explanation:
I hope this will help u
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Which graph would best represent the car
Answer:I think D
Explanation: it makes sence
What impact did the Spanish have on the region of South America?
In two to three sentences, include two examples of how the Spanish impacted the region of South America.
Answer:
The Spaniards practically went to war with the native Americans in South America, such as the Inca. They also brought diseases to South America. Diseases like smallpox.
Explanation:
Then after effectively killing off most of the native American population the Spanish continued to use South America for resources and they enslaved most of what was left of the non-Spanish and mixed populations. Francisco Pizarro took a page from Cortes' book, capturing Atahualpa, Emperor of the Inca, in 1532 and Cortes was the conquistador who defeated the Aztec Empire in what is now modern day Mexico or Central America.
Henry touched a hot plate and immediately moved his finger away from it.
Which best explains the integumentary system’s role in this reaction?
a. Oil in the skin sensed the temperature difference.
b. Nerve endings in the skin responded to the heat.
c. Some hairs stood up when the fingers touched the plate.
d.His nails absorbed heat and moved his finger away from the plate.
Answer:
b. Nerve endings in the skin responded to the heat.
Explanation:
hope this helps
Answer:
B. Nerve endings in the skin responded to the heat.
Explanation:
Nerve endings are what sense something, sends a message to the brain, the brain would read and respond.
Hope that helps and have a great day!
How was Aristotle’s model similar to Ptolemy’s model?
Both models stated that the planets rotate on their axes.
Both models stated that Earth is the center of the system around which other objects orbit.
Both models stated that the planets and objects in the solar system have small orbits called epicycles.
Both models stated that the Sun is the center of the system around which objects have elliptical orbits.
Answer:
Correct answer is B
Explanation:
I listened in class peeps
Aristotle’s model was similar to Ptolemy’s model because they both believed that: (B). Both models stated that Earth is the center of the system around which other objects orbit.
Meaning of a modelA model can be defined as a three dimensional representation of an idea or theory or belief.
A model can also be said to be a representation of a philosophy or idea put up by an individual that can be used as an example.
In conclusion, Aristotle’s model was similar to Ptolemy’s model because they both believed that: (B). Both models stated that Earth is the center of the system around which other objects orbit.
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Explain the symbiotic relationship of a coyote that eats a rabbit.
A coyote eating a rabbit is an example of....
I think this because..
What are some of the possible solutions for solving air pollution issues?
Answer:
Conserve energy - at home, at work, everywhere.
Look for the ENERGY STAR label when buying home or office equipment.
Carpool, use public transportation, bike, or walk whenever possible.
Follow gasoline refueling instructions for efficient vapor recovery, being careful not to spill fuel and always tightening your gas cap securely.
Consider purchasing portable gasoline containers labeled “spill-proof,” where available.
Keep car, boat, and other engines properly tuned.
Be sure your tires are properly inflated.
Use environmentally safe paints and cleaning products whenever possible.
Mulch or compost leaves and yard waste.
Consider using gas logs instead of wood.
Explanation:
Answer:
Make more earth-friendly ways to create energy using natrual resorces instead of fossil fuels releases greenhouse gases into the atmosphere and that causes the levles of Co2 and other gasses.
Example: Solar Energy, Wind Energy, Hydropower, etc.
Explanation:
Which of these themes is common to both stories?
the importance of friendship
how unreliable magic is--you can’t count on it
power makes people behave badly
Answer:
uh
Explanation:
uh
Why were the Spanish interested in conquering Peru?
Write your response in one to two complete sentences.
The Spanish were interested in conquering Peru because _________________________________________________________________________
Answer:
531–1532 – Pizarro's third voyage to Peru. Spaniards form a bond with the Natives (Huancas, Chankas, Cañaris and Chachapoyas) who were under the oppression of the Inca Empire, and Pizarro includes them among his troops to face the Incas. Atahualpa is captured by Spanish.
Explanation: Is this right ?
if it is please give thanks
What best describes the physical property of solubility?
A The ability of a substance to float.
B The ability of a substance to mix into or dissolve in a liquid.
C The inability of a substance to change states.
D The ability of a substance to separate easily.
Answer:
b
Explanation:because substance that mix or dissolve it explain better.
Answer:
B is what I would choose
(ZOOM IN TO SEE )plzzzz
Answer:
I think it might be A
Explanation:
I can barely read the options
Answer:
A
Explanation:
Newton's third law is "For every action, there is an equal and opposite reaction" In the case of this question, if an object is exerting a force that the second object will exert the same force in the opposite direction.
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.
Which statements best describe a temperate coniferous forest? (Select all that apply.)
They experience cool winters.
They are found in the Arctic.
They receive very little rainfall.
They have warm summers.
Answer:
They experience cool winters and
They have warm summers
Explanation:
The temperate evergreen (coniferous) forest has mild summers, cool to cold winters, and more precipitation than the taiga.
Temperate coniferous forest experience cool winters and have warm summers. Therefore, the correct options are option A,D.
What is temperate coniferous forest?The World Wide Organization for Nature defines temperate coniferous woodland as a terrestrial biome. Temperate coniferous forests can be found mostly in locations with warm summers and chilly winters, and their plant life varies. Some are dominated by needleleaf trees, while others are dominated by broadleaf evergreen trees or perhaps a mixture of both tree species.
Temperate coniferous forests can be found along the coasts of places with moderate winters and copious rainfall, as well as inland in drier climes or montane locations. These woods are home to a variety of tree species, include pine, cedar, fir, among redwood. Temperate coniferous forest experience cool winters and have warm summers.
Therefore, the correct options are option A,D.
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CONTACT FORCES
The force applied by a magnet on an iron nail.
The force applied by a student on a door to open it.
NON-CONTACT FORCES
The force applied by an electromagnet on a wire.
The force applied by the planets on each other.
Which statement best explains why the table is incorrect?
A. Magnetic force is a force acting at a distance
B. The student applies a non-contact force on the door
C. Electromagnets use contact force
D. Gravitational force acts between planets only when they are in contact.
Answer:
C. Electromagnets use contact force
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What is the difference between nuclear fission and nuclear fusion?
Answer:
Fission is the splitting of a large atom into two or more smaller ones. Fusion is the fusing of two or more lighter atoms into a larger one. Fission reaction does not normally occur in nature.
Explanation:
Quizlet
What type of relationship is pollination of flowers?
Tell which type of relationship it is: mutualism, predation, parasitism, competition, or commensalism. Give details on why.
I think that animals pollinating flowers is an example of....
I know this because.
Answer:
The bee is getting nectar from the flowers which allows it to feed the hive, and in the exchange, the bee carries the pollen and helps reproduce flowers. This is a win-win for the bees and flowers, which is mutualism.
Explanation:
the answer is self explainatory, good luck!
Match the definitions below with the correct component of the scientific method:
1.
Analyze your data and relate it back to your hypothesis.
2.
Define a problem to focus the goal of your experiment.
3.
Obtain information while conducting your experiment.
4.
Make a prediction about the outcome of your experiment
5.
Use your senses to gather information around you.
6.
Design an experiment and conduct trials to assess your hypothesis.
a.
Make observations
b.
Conduct testing
c.
Collect data
d.
Draw conclusions
e.
Ask questions
f.
Form a hypothesis
Answer:
F and 4
D and 1
E and 2
A and 3
C and 5
B and 6
Explanation:
Science Fair platform
How can the environment affect population sizes?
My scientific explanation is:
Your answer should include at least six complete sentences to explain the claim, evidence and reasoning.
Be sure to check your grammar and spelling.
The environment affects the population such as people with lung diseases affect there overall health and may lead to death. Also, the way humans live affect global warming which could affect floods that would also lead to death. People with skin diseases are more likely to get sick or die from the global warming. Starvation take a huge factor on natural disasters. Second hand smoking into the lungs can create serious problems for people that are surrounded around people that smoke and have weak lungs and immune system.
What causes the formation of mountain ranges along the ocean floor?
Sediment from rivers causes added sediments until mountains are formed.
Plate tectonics pulls the ocean floor apart and magma pushes up forming mountains.
Underwater volcanos erupt, creating underwater mountain chains.
Sedimentary rock is forced together forming mountain ranges.
Explain 1 difference between Prokaryotic and Eukaryotic cells. plz plz plz plz plz help me plzzzzzzzzzzzzz all my points this due today
Answer:
Prokaryotes are organisms made up of cells that lack a cell nucleus or any membrane-encased organelles. Eukaryotes are organisms made up of cells that possess a membrane-bound nucleus that holds genetic material as well as membrane-bound organelles.
Explanation:
Answer:
Prokaryotic cells do not have membrane bound organelles such as mitochondria, nucleus, etc. Eukaryotic cells consist of membrane bound organelles which are tiny compartments in the cell designed for a specific purpose such as the nucleus, mitochondria, etc.
Hello! Could somebody please help? Thanks!! Will give brainliest and 38 points!!!
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Salinity of sea water is usually measured in parts per:
hundred
thousand
%
million
Answer:
thousands
Explanation:
here is why because think about it most oceans are measured by how much goes in it every day by the thousands of gallons of sea water so i hope this helps you understand your question
Answer: 35 parts per thousand.
Explanation: How much salt in a sea is measured in parts. So, meaning by that, it is measured by 35 parts per thousand. It's use as the grams of salt in the water, which is 1,000 grams of salt in water. 35 grams of salty water is equal to 1 kilogram of seawater.
Which of the following happens when unbalanced forces act on a object?
A. the object remains stationary
B. the object moves with the same velocity
C. the object moves in the direction of the stronger Force.
D. the object speed and direction of motion remain unchanged.
Also please explain why too please I WILL GIVE BRAINLIEST!
Answer:
C.
Explanation:
The stronger force causes the object to move in the opposite direction, The object keeps the same speed though.
Can I get brainliest. PLEASE!
Answer:
i believe it is c
Explanation:
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Analyze the forces acting on the crate shown in the diagram. Explain why the crate will not move in the direction of the applied force. (Fapp.)
The crate will not move in the direction of the applied force because in the image there are two forces.
What is force ?A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.
Contact forces and act at a distance forces are the two different types of forces. Your daily use of force is evident. Basically, push and pull are forces. You exert force on an object when you push against it or pull against it.
Thus, The crate will not move in the direction of the applied force because in the image there are two forces.
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