The diagram below shows a hand warmer. It uses a controlled burn of a type of lighter fluid called naphtha.



The device has a refillable reservoir that holds the naphtha liquid. The fuel moves into a glass fiber burner, which absorbs the fuel and allows it to burn slowly without producing a flame. Oxygen reaches the burner through the holes on the cap at the top of the device. As the fuel is burned, heat is conducted to the metal casing of the device.

When the hand warmer is tested, it becomes too hot and uncomfortable to hold. How could the device be modified to solve this problem?
A.
by increasing the size of the fuel reservoir so that it can store more liquid fuel
B.
by replacing the glass fiber burner with a material that does not soak up liquid fuel
C.
by attaching a covering to reduce the amount of oxygen entering the device
D.
by using a fuel that is more flammable than naphtha so that the fuel can be used faster

Answers

Answer 1

Answer:

c

Explanation:

by attaching a covering to reduce the amount of oxygen entering the device


Related Questions

(8.9B) A student made a chart to classify plates by the types of boundaries. What crustal
feature is most likely found between the South American and African plates? *

A Folded mountain
B Ocean trench
C Mid-ocean ridge
D Fault

Answers

Answer:

folded mountain

hope it will help you

The crustal feature is most likely found between the South American and African plates is folded mountain. The correct option is A.

What is folded mountain?

When two or more of the tectonic plates of Earth are forced together, fold mountains are formed.

Rocks and debris are bent and folded into rocky outcrops, hills, mountains, and entire mountain ranges at these interacting, compressing limits. Orogeny, a process, is what produces fold mountains.

While having a narrower width than their length, fold mountains are very long.

Concave and convex slopes are typically present on opposite sides of fold mountains. Most fold mountains are located on the edges of continents that face the ocean.

A student created a chart to categorize plates according to the different boundary types. The folded mountain is most likely the crustal feature that lies between the South American and African plates.

Thus, the correct option is A.

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Two ecosystems are compared in terms of population size and species diversity. One ecosystem has a large number of individuals but low species diversity, while the other ecosystem has fewer individuals but greater species diversity due to high mutation rates. Which of the following statements best describes how these two ecosystems would respond to an environmental stress such as drought?

The ecosystem with greater diversity is less dependent upon resources and would suffer less from the drought.
The ecosystem with greater diversity is more stable and would, therefore, be more likely to withstand the drought.
The ecosystem with more individuals is less likely to suffer because it is more productive and, therefore, more stable.
The ecosystem with more individuals is more likely to have members that are drought-resistant and will survive and reproduce.

Answers

Answer: I had the same problem in one of my exams. I think the answer is "the ecosystems with greater diversity is more stable and would, therefore, be more likely to withstand the drought.

Explanation:

I chose this because it seems like the most logical explanation.

"The ecosystems with greater diversity is more stable and would, therefore, be more likely to withstand the drought. Thus, option B is correct.

What is biodiversity?

Biodiversity is considered as the variety of living things found in the various habitats, such as terrestrial, marine, and desert ones, as well as the ecological groups to which they belong.

The variety of the creatures present in an ecosystem, as well as their relative abundances, is referred to as biodiversity. It also depicts the various stages of organism organization.

In ecosystem there are thirteen different grass species present and in ecosystem Y 1 species of grass present, that is,  ecosystem X has a greater amount of biodiversity. So, during  the drought, the bison in ecosystem X are better able to survive.

Therefore, "The ecosystems with greater diversity is more stable and would, therefore, be more likely to withstand the drought. Thus, option B is correct.

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PLEASE HELP MEEEEE YOU WILL GET THE BRAINELIST

PLEASE WRITE A SUMMARY ABOUT THE LAW OF UNIVERSAL GRAVITATION

Answers

Answer:

When NASA sends rockets into space, they have to contend with a lot more than just astronaut training, fuel loads, and an overall mission objective. The astrophysicists who plan space travel must also contend with fundamental laws of physics. Chief among these is Sir Isaac Newton’s law of universal gravitation.

Explanation:

Which organisms does the rabbit eat ?

Answers

Answer:

Plants /producers

Explanation:

Hope this helps and have a great day!!!!

Answer:

plants,broccoli,Brussels sprouts,seeds,roots etc.

Explanation:

I hope it will help u

Hammed has 200 stamps. 35% from Europe, 10% from Asia , 20% from Australi The rest of the stamps from North America. How many of Hammed's stamps are from North America?

Answers

Answer:El 35% es de America del Norte

Explanation:

Answer:

135%

Explanation:

Given

Europe =  35%

Asia = 10%

Australia* = 20%

North America = ?

To find

Europe + Asia + Australia =

35% + 10% + 20% = 65%

Then the total subtracted from the given

200 - 65 = 135

Therefore,

North America = 135%

Confirm

To make sure that is the correct answer, add it all together.

35 + 10 + 20 + 135 = 200

Which means it is correct.

In which of the following organisms did photosynthesis most likely first
evolve?
A. Algae
B. Prokaryotes
C. Plants
D. C4 plants

Answers

It’s B, since
Compared to prokaryotic organisms such as bacteria, plants and animals have a relatively recent evolutionary origin. DNA evidence suggests that the first eukaryotes evolved from prokaryotes, between 2500 and 1000 million years ago.

The following organisms did photosynthesis most likely first  evolve - B. Prokaryotes

Sufficient evidence indicates that eukaryotic photosynthesis originated from endosymbiosis of cyanobacterial-like organisms

ultimately these prokaryotes became chloroplasts in eukaryotic cells.So the evolutionary origin of photosynthesis is to be found in the bacterial domain.The geological record indicates that this transforming event took place early in Earth's history, at least 2450–2320 million years ago

Thus, The following organisms did photosynthesis most likely first  evolve - B. Prokaryotes

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Para ya por favor Cual de los siguientes planteamientos se cumplen en relación a la energía en un ecosistema * A.La energía fluye de los heterótrofos a los autótrofos B.La energía, a menudo se libera de un ecosistema en forma de luz C.La organización de productores-consumidores y descomponedores muestra como la energía se concentra de manera mas alta en los descomponedores D.Para la mayoría de los ecosistemas la energía proviene de la luz

Answers

Answer:

D.Para la mayoría de los ecosistemas la energía proviene de la luz

Explanation:

Los ecosistemas requieren de un suministro constante de energía para poder sustentar la vida. A excepción de ecosistemas basados en fuentes hidrotermales, en general este aporte energético proviene del sol que suministra energía lumínica la cual es convertida por los organismos productores (por ej., plantas y algas) en compuestos orgánicos. Los productores representan la fuente de energía y alimento de consumidores primarios (por ejemplo, herbívoros), los cuales a su vez sirven de sustento para consumidores secundarios (por ej., carnívoros), estos suministran de alimento a los consumidores terciarios y así sucesivamente. Finalmente, los descomponedores son aquellos microorganismos que se alimentan de los restos orgánicos obtenidos a partir de productores y consumidores.

The DNA strand and pre-mRNA strand are anti-parallel. With this in mind label the 3' and
5' ends of the pre-mRNA strand in Model 1. Where would i put it??

Answers

Answer:

I think the right side is 3 prime and left sde is 5 prime

Explanation:

Because the process of transcription takes place in nucleus so it should be put inside the nucleus.

What is nucleus?

In genomics, a nucleus is a membrane-enclosed organelle within a cell that houses the chromosomes.

What is Transcription?

The process in which  information of a strand of DNA is copied into a new m RNA molecule is known as Transcription.

The  enzyme responsible for transcription is RNA polymerase.

Transcription start when RNA polymerase binds to a promoter region at the start of a gene directly or through helper proteins.

Initiation, Elongation, and termination are the three steps of transcription.

Transcription is carried out with the help of enzyme RNA polymerase and some proteins known as transcription factors.

Enhancer and promoter sequences are the  DNA sequences on which transcription factors attach to initiate the transcription process by directing  RNA polymerase to the correct transcription site.

The transcription initiation complex is made up of transcription factors and RNA polymerase working together.

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GIVING BRAINLIEST!!!!!

give 2 examples of muscles & their function

Answers

Answer:

Deltoid - Your deltoid muscles help move your shoulders

Quadriceps - Helps move your legs

Hope this helps :3

Explanation:

Answer:

I'm just going to go ahead and give you the three types of muscle!

Skeletal, Cardiac, and Smooth Muscle.

Explanation:

Skeletal Muscle:

The muscles attached to your bones that help pull and push when you move.

Cardiac Muscle:

Heart muscle that keeps the blood pumping. Is very thick and strong, as well as elastic to ensure smooth blood flow.

Smooth Muscle:

Essentially muscles in the other areas of your body, especially internal organs. For example, the muscles in your digestive system that involuntarily move food through your bowels are smooth muscles.

This is a basic picture on the three types! Hope that helped :)

Que tedria de particular la retina de un animal que no pudiera diferenciar los colores cuya vision fuera exclusivamente en blanco y negro

Answers

Answer:

La falta de células cono en la retina

Explanation:

En vertebrados, la retina se encuentra formada por dos tipos básicos de células denominados células conos y células bastones. Las células cono son unas células fotosensibles las cuales forman una capa concentrada en el centro de la retina. Estas células (células cono) son responsables de la distinción entre diferentes colores del espectro de luz visible. Las células cono se clasifican en tres tipos de acuerdo a su sensibilidad para distinguir la luz azul, roja, y verde. Esta sensibilidad se debe a la presencia de diferentes tipos de proteínas opsinas, las cuales confieren la capacidad de absorber la luz en una longitud de onda particular: cianopsina (sensible a la luz azul), eritropsina (sensible a la luz roja) y cloropsina (sensible a la luz verde). Animales como los gatos y los perros son daltónicos, es decir, no pueden completamente diferenciar los colores, debido a la falta de una o más clases de células cono (y por lo tanto también de opsinas) en la retina.

A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A.
respiratory and muscular systems
B.
skeletal and digestive systems
C.
respiratory and digestive systems
D.
skeletal and muscular systems

Answers

Answer:

D

Explanation:

skeletal and muscular systems

what process is responsible for the absence of glucose and amino acids in urine

Answers

Answer:

The force of hydrostatic pressure in the glomerulus (the force of pressure exerted from the pressure of the blood vessel itself) is the driving force that pushes filtrate out of the capillaries and into the slits in the nephron

Selective reabsorption can be considered the process responsible for the absence of glucose and amino acids in urine.

What is selective reabsorption?

The selective reabsorption mechanism allows the absorption of different substances including glucose and amino acids in the urine.

This reabsorption occurs after filtration in the capillaries of the urinary system.

The filtration and excretion of waste substances are associated with the formation of urea.

In conclusion, selective reabsorption can be considered the process responsible for the absence of glucose and amino acids in urine.

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Soil erosion can increase when humans remove trees and other vegetation from an area. What

is this process called?

A. decomposition

B. conservation

Answers

I think the answer is B.conservation:)

Help me please !!! :)

Answers

Answer:

they both have oxygen in the atmosphere

Explanation:

Which is not a factor that weather depends upon? Hours of daylight Air Temperature Air pressure Moisture

Answers

Answer:

Option A , Hours of daylight  does not affect the weather

Explanation:

The seven prime factors that affect the weather are

Temperature

Pressure

Moisture content

Speed and direction of air

Latitude

Ocean currents

Elevation and bodies of water.

Hence, option A , Hours of daylight  does not affect the weather

The following is a growth curve of bacteria. What type of growth curve is pictured? A) linear growth B) logistic growth C) exponential growth​

Answers

Answer:

C) exponential growth​

In the given figure, exponential growth curve is pictured.

What is exponential growth?

It is the pattern of data, which demonstrates greater enhancements with passing time, giving rise to a curve of an exponential function. During the growth cycle of bacteria, the cells of bacteria goes through different phases, that is:

Lag phaseExponential phaseStationary phaseDeath phase

In the case of bacteria, the cells enter the log or the exponential phase after the lag phase. This is the time when the cells get differentiate by the process of binary fission and double in numbers after each generation time.

In this pattern of growth, the metabolic activity is high as RNA, DNA, the components of the cell wall, and other substances essential for growth are generated for differentiation.

Thus, the pattern of growth demonstrated in the given figure is exponential growth.

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Please help me im stuck on this question!!! Please hurry !!

Answers

Answer:

one of the smallest stars

Explanation:

there are trillions of stars and most of them are millions of times the size of our sun

which symptom is not included in the diagnosis of water intoxication?

Hyponatremia
Loss of electrolytes
Confusion
Cell shrinkage

Answers

Cell shrinkage will be the answer

Distinguish between apocarpous and syncarpous

Answers

1.The Flower Has Several Ovaries In Apocarpous.There is a single ovary in syncarpous
2. On maturity apocarpous ovary forms fruitlet of aggregate type. on maturity syncarpous ovary forms a simple fruit.
Hope either of these helped

How do consumers get nitrogen?

Answers

When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use :D

Answer: Consumers eat plants or other animals to get their nitrogen.

PLEASE HELP YOU WILL GET MARKED THE BRAINIEST AND PLEASE TELL ME WHY U CHOSE THE ANSWER

- What is the geocentric model of the
universe?

a) The Theory of Evolution

b) Newton's Laws of Motion

c) The belief that Earth is at the center of our solar system

d) Superstition

Answers

Answer:

I believe C,

Explanation:

The geocentric model of the universe maintained that the Earth was at the center of everything in the solar system. In it, the Sun and planets orbited around our planet. Many odd and elaborate adaptations were required to make this model agree with observations. This problem increased, as our our observations got more accurate.

The geocentric model was superseded by the heliocentric model, in which the planets all orbited the Sun. The Heliocentric model was eventually able to show that the positions of the planets over time were much more convincingly, and simply portrayed by it, than by the former model.

Apologizes if I'm wrong/

Answer: It is c because the person who made it or thought of it said that the earth is at center of the cosmos or the universe.

Explanation:



Various factors influences the fluidity of the phospholipid bilayer of the cell membrane. If we were to chart the composition of cell
membranes in organisms as we move north from the equator to higher latitudes around the Arctic circle, we would expect to find
phospholipids with
A)
fewer hydrophilic heads.
B)
fewer interspersed cholesterol molecules.
both saturated and unsaturated fatty acid tails.
D
an increase in the length of the fatty acid tails.

Answers

Answer:

D

an increase in the length of the fatty acid tails.

Explanation:

As average annual temperatures decrease, we would expect to find phospholipids within the cell membranes of organisms to have both saturated

and unsaturated fatty acid tails. Saturated fatty acids tails are arranged linearly, in a way that maximizes interactions between the tails and

decreases bilayer fluidity. Unsaturated fatty acids, on the other hand, have more distance between the tails, fewer intermolecular interactions and

more membrane fluidity. Longer tails and decreased cholesterol also decrease fluidity

The answer is Going to be D

amino acids come from which type of organic molecule?

Answers

Answer:

QUESTION:

amino acids come from which type of organic molecule?

ANSWER:

Proteins

Proteins are polymers made up of nitrogen-containing monomers called amino acids. An amino acid is a molecule composed of an amino group and a carboxyl group, together with a variable side chain.

Explanation:

Hope that this helps you out! :)        

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Have a great rest of your day/night!        

Please thank me on my profile if this answer has helped you.

Answer:

PROTIENS............... i think.

Explanation:

The larvae of potato beetles cover themselves in their own feces to avoid being consumed by predators. What system produces feces?

Answers

Answer:

Explanation below

Explanation:

Hemisphaerota cyanea, also known as the palmetto tortoise beetle, is a type of leaf beetle that cover themselves with their own feces, just to persuade most predators to pass them by. This form of outrageous defense, developed by the crafty beetle, was discovered by biologists at the Cornel university.  

The feces comes out of the hindgut of the beetle, fashioned like golden strands, which can be used to protect the vulnerable body of the beetle.  

When a water molecule is added to a polymer, the
from water becomes attached to one subunit and the hydroxyl attaches to another subunit, breaking the covalent bond between two monomers. This process is referred to as hydrolysis.

Answers

Answer:

Hydrogen

Explanation:

How does gas exchange occur in plants? ​

Answers

Plants obtain the gases they need through their leaves. They require oxygen for respiration and carbon dioxide for photosynthesis.

Explanation:

The gases diffuse between the cells spaces of the leaf through pores, which are normally on the underside of the leaf - stomata. From these spaces they will diffuse into the cells that require them.

amino acid is to protein as _____ is to dna

Answers

Amino acids are the building blocks of proteins. The analogous building blocks of DNA would be nucleotides (or, if you want to get really specific, deoxyribonucleotides).

Of the four points shown on the diagram, deposition is greatest at points

Answers

Answer: I would say B and C.

Explination: Deposition is material deposited in a new spot. On points B and C, it appears the residue from the water would end up on those river banks.

Which of the following is a function of the lymphatic system?
a.
filters blood
c.
produces red blood cells
b.
absorbs nutrients
d.
produces bone marrow



Please select the best answer from the choices provided


A
B
C
D

Answers

A-Filters Blood
YW;)

Which of these Is NOT a type of habitat?

A) a desert
B) a mountain
C) a rainforest
D) the world

Answers

Answer:

D

Explanation:

Its kinda hard to explain but the world is more like a planet(?) and not a type of habitat since anything can live on it

Answer:

D- the world

Explanation:

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