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

PLEASE HELP I WILL GIVE BRAINLIEST

Answers

Coal is burned
Water boils creating steam
Moving steam turns turbines
Turbines generate electrical energy

What is a Protein Made of?
pls, explain

don´t copy and paste of
what googlle
said plsssssss

Answers

Answer:

The correct answer is - amino acids.

Explanation:

Proteins are made up of amino acids by linking together by the peptide bonds therefore the building blocks of the proteins are amino acids and due to amino acids linked together by peptide bond they called polypeptide chain;

Amino acids are small organic molecules form by the process translation and have a central carbon atom with an amino -NH group, a hydrogen atom, a carboxyl group -COOH, and a side chain.

When an object is already in motion, why is energy required to stop it

Answers


Newton’s Law. Either meet with opposite same momentum, or transfer that momentum to another body.

When an object is already in motion then we require force to stop it because due to inertia , a body tends to remain in the state of motion unless an external force acts on it .This is in accordance with Newton's  first law of  motion or  law of inertia of motion.

What is inertia ?

Inertia is the tendency of a body to remain the way it is. It opposes any changes to its state of rest or motion.

The more is the mass of the body , the greater will be the inertia.

What is external force?

External force is the force applied by external agents on the body.

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A. Mutualism
B.Commensalism
C.Parasitism
D.Predation​

Answers

Answer:

D.Predation

Explanation:

Living organism interact with one another in their natural environment. The interaction of two organisms is called SYMBIOSIS. Symbiosis, however, can be of different types depending on how the organisms relate. One type of symbiotic relationship between organisms is called PREDATION.

Predation is a relationship between two organism in which one organism called PREDATOR kills and feeds on the other organism called PREY in order to obtain energy. In this question, a Manta Ray and a zooplankton is shown.

The Manta ray is described as an aquatic organism that feeds on tiny species like fishes while the zooplankton is a tiny organism found in water bodies. The Manta Ray is the predator that kills and feeds on the zooplankton, hence, the relationship is a PREDATION.


Explain why it is important that an egg cell
and a sperm cell have only half the normal
number of chromosomes.

Answers

Answer:

Gametes are reproductive cells, such as sperm and egg. As gametes are produced, the number of chromosomes must be reduced by half. Why? The zygote must contain genetic information from the mother and from the father, so the gametes must contain half of the chromosomes found in normal body cells

Explanation:

Which of the following is a true statement?
A. Disruptions in an ecosystem are normal and natural changes.
B. Disruptions in an ecosystem are caused by both human activity and environmental disturbances.
C. Ecosystems are complex, interactive systems that include both biotic and abiotic components of the environment. D. All of these are true statements.​

Answers

Answer:

All the statements are true and the correct option is;

D. All of these are true

Explanation:

Ecosystems change over time. ... Sudden disruptions such as volcanoes, floods, or fires can affect which species will thrive in an environment. Other disruptions are caused by human activities

An ecosystem ecosystem is an area where a community living (biotic) and non living (abiotic) things such as plants, animals, other organisms, landscape, natural sources and weather interact to create an apparently sustainable system

An ecosystem undergoes several changes over time due to environmental disturbance which results in the variation of the ecosystem's structure and change rate due to the natural disturbance and/or human activity

Therefore all the statements are true.

Describe how the relative surface temperature and the relative luminosity of Aldebaran would change if it collapses and becomes a white dwarf like Procyon B

Answers

Answer:

Greatly affect the luminous intensity.

Explanation:

The relative surface temperature and the relative luminosity of Aldebaran will greatly decreases if it becomes Procyon B because more surface area of a star increases the luminous intensity of that star.  The size of Aldebaran is 30.7 million km whereas the size of Procyon B has 8585 km which very much lower than the Aldebaran so there is a great difference in the magnitude of luminosity between Aldebaran and Procyon B. So we can conclude that the decrease in the surface area of a star will greatly affect its luminous intensity.

Choose the best response on how sea otters and sea turtles deal with the salty ocean.
Question 7 options:


The sea otters use their eyes to secrete salt and the sea turtles have an extra large kidney.


The sea otters have an extra large liver and the sea turtles have an extra large kidney.


The sea otters have an extra large kidney and the sea turtles use their eyes to secrete salt.


The sea otters have an extra large lung and the sea turtles have an extra large kidney.
Had to repost because someone posted a link to a fake website (i tested it in a virtualmachine) and now its not appearing in recommended anymore since it says answered

NO LINKS
IF YOU SEND A LINK I WILL REPORT

Answers

Answer:

The sea otters have an extra large kidney and the sea turtles use their eyes to secrete salt

Explanation: I took the test

if I am wrong please correct me

Have a great day!

The sea otters having an extra large lung and the sea turtles having an extra large kidney is how they deal with salty ocean.

What is Ocean?

This is a vast body of salty water which covers majority of the earth surface and has different forms of life present in them.

Organisms such as sea otters have an extra large lung and the sea turtles have an extra large kidney which makes them adapt to the salty condition.

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Which of the following is most likely to happen if data from a scientific
experiment are collected improperly?
O A. The hypothesis will be disproved.
B. The scientist will be discredited.
C. New discoveries will be made.
D. The conclusions will be inaccurate.

Answers

the answer will be (d)- the conclusions will be inaccurate.

Need help with this question, I give branliest :)

Answers

Answer:

Your Answer is A I believe

1.

2.

Which process is represented

inside the dashed circle?

A. Evapotranspiratio

n

B. Precipitation

C. Runoft

Infiltration

After clouds are formed through condensation, what process can

happen next?

A. Evapotranspiration

B. Precipitation

C. Runoff

D. Infiltration

Erica notices her bedroom windows have water droplets on them

even though it didn't rain. What is the likely cause?

A. Condensation

B. Infiltration

OUTPUT

C. Sublimation

STATION

D. Evaporation

3.

Answers

Answer:

1. D

2. B

3. A

Explanation:

The dashed circle indicates the process of infiltration because the water of precipitation goes inside the soil. Infiltration is the process in which water enters the soil through small opening present on the earth surface. When the clouds are formed, precipitation occurs in the form of rainfall and snowfall. Condensation is a process in which water vapors change into liquid when the environment has low temperature or cool so condensation occurs on the windows of Erica.

3) Which of the following parts of a plant cell does photosynthesis depend upon?
A: Mitochondria
B: Chloroplasts
C: Vacuoles
D: Cell wall

Answers

Answer:

Chloroplasts

Explanation:

The chloroplasts are what "collects" the sun and turns it into usable energy for the rest of the cell :)

Answer: B chloroplasts


Explanation: I’ve been studying this

To be a possible answer to a scientific question, a hypothesis must be

testable.
unique.
written.
controlled.

Answers

Answer:

A hypothesis is a possible explanation for a set of observations or an answer to a scientific question. A hypothesis must be testable and measurable. This means that researchers must be able to carry out investi- gations and gather evidence that will either support or disprove the hypothesis.

Explanation:

How might the loss of sea ice affect people, animals, or ecosystems?

Answers

Answer:

The Global Impacts of Arctic Sea Ice Loss. Some of the most important climate news this winter has been around the alarming lack of sea ice in the Arctic, which has been in decline due to the steady rise in Earth’s average air and ocean temperatures. While suffering polar bears are a poignant symbol of climate change, the effects of disappearing ice extend far beyond the Arctic circle and its inhabitants.

Explanation:

I did the same thing

Why is it important for the brain to be so well protected?

Answers

Answer: It controls hunger and thirst and some of the most basic body functions, such as body temperature, blood pressure, and breathing. The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges. The brain is also cushioned and protected by cerebrospinal fluid.

Explanation:

In the experiment, how could recover the dissolved salt? How do you think its mass would compare with the mass of dry salt you started with.
ALSO I HAVE NO IDEA EVEN GUESSES WOULD BE HELPFUL

Answers

Answer:

You can recover the dissolved salt by heating the water. When heated the water will evaporate, and the salt will be left. It's mass would be the same as at the beginning.

What type of carbon-based molecule is the first to be broken down by the body's cells to provide a source of energy?

Answers

Answer: Glucose

Explanation:

The carbon based molecule which is broken by the cells of the body is glucose it is a carbohydrate that is obtained from food we consume it is stored in the form of glycogen. When the energy requirement of the body increases then glucose monomers are released from the glycogen chain so that glucose monomers can participate in the energy generation process in the mitochondria of the cell. The chemical energy so produced is ATP (adenosine triphosphate).

how does a chemical equation differ from a mathematical equation?​

Answers

Answer: Chemical equations are different from mathematical equations because the two parts of a chemical reaction represent the 'before' and 'after' of a chemical reaction. In mathematical equations, an equals sign separates the two parts of the equation. In chemical equations, equal signs are not used

Explanation: hope this helps :D (he disconnected)

What is an advantage to being ectothermic?

Question 18 options:

Ectothermic animals require much less energy to survive than endothermic animals.


Ectothermic animals can sleep longer than endothermic animals.


Ectothermic animals always live longer than endothermic animals.


Ectothermic animals can live in a greater number of environments than endothermic animals.

Answers

Answer:

more environments and i think they require less energy... but more environments for sure

Explanation:

Which of the following factors would best contribute to a measurement of environmental quality?

Average temperature
Water clarity
Salinity levels
Average speed of sound

Answers

Answer:

water clarity

Explanation:

The factor that will best contribute to the measurement of environmental quality is : ( B ) Water clarity

What is water clarity ?

Water clarity shows how far light can penetrate a water body. A very clear water in an environment shows that the water bodies contain little or no suspended soil particles.

Very clear water found in a environment represents a very high quality of live in the environment and can be used to measure the environmental quality.

Hence we can conclude that The factor that will best contribute to the measurement of environmental quality is : ( B ) Water clarity

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Using an example for each, explain the following ecological concepts.

a) Succession

b) Energy flow between trophic levels

c) Limiting factors

Answers

Answer:

1-Ecological succession is the process of change in the species structure of an ecological community over time.

2-Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.

3-A limiting factor is a variable of a system that causes a noticeable change in output or another measure of a type of system.

Explanation:

Urgenttt!!! Will give brainlist to best answer!!

Early agricultural meals usually took what form?

A roast plus side dishes.

A single food item such as
tubers or beans.

Stew with multiple ingredients.

Bread made from whatever grain was most common.

Answers

Answer:

Stew with multiple ingredients

Answer:

tubers and beans

Explanation:

Heather presented to her class a report about the pancreas. Which statement in Heather’s report was not accurate?
The pancreas has both endocrine and exocrine functions.
The pancreas regulates blood sugar concentration.
The pancreas triggers the development of secondary sex characteristics.
The pancreas helps digest fat, protein, and carbohydrates.

Answers

Answer:

C. The pancreas triggers the development of secondary sex characteristics

Explanation:

Edge 2021

The statement in Heather’s report was not accurate C. The pancreas triggers the development of secondary reproductive characteristics.

What are the different pancreas digestive enzymes?

The pancreas secretes digestive enzymes in the slender instincts, these enzymes produce endocrine secretions through the hormones and pass through the blood.

Endocrine cells called pancreatic islets secrete insulin and glucagon and have endocrine functions that are formed through the hormones and pass through the bloodstream.

Thus, option "C" is correct.

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What is the difference between ecosystem and species?

Answers

Answer:

An ecosystem is a collection of species living together in a given environment.

The main difference between species diversity and ecosystem diversity is that the species diversity is the variety of species in a particular region whereas the ecosystem diversity is the variety of ecosystem in a particular area.

What Rh Factor? Why is it important?

Answers

Explanation:

The Rh factor is one of the proteins on RBCs used to indicate whether the blood of two different people is compatible when mixed – such as blood of a mother and her baby at birth.

It is routine and important that the Rh factor for a mother and unborn child be determined during pregnancy.

Hope this is what you wanted.

How is the information from the stimuli communicated to the brain? WILL GIVE BRAINLIEST IF RIGHT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:

Sensory receptor interact with stimuli, such as light  sound temperature and pain which is transformed into the code that is carried to the brain by the chain of neurons. Once the signal reaches he end of an axon, which is at the end of neuron, a neurotransmitter is released and the process repeats.

Answer:

Your body perceives the stimuli the brain recognizes the mind decides how the body will deal with the stimuli

Explanation:

What does a genesis rock look like? Describe it

Answers

Answer:

A Genesis rock is pale in color and tends to be white to tan, leaning more toward cream. Often times it is dirty so it looks more of a tan to a light brown color. Other than that, it looks like an average rock.

Explanation:

please help!!!! will give brainliest

Answers

Answer:

1.isotonic

2.hypertonic

3.hypotonic

4. active transport

5. passive transport

6.diffusion

7.osmosis

8.solute

9. solvent

Explanation:

the best answer and I hope it will help you

In the growth curve pictured below. what can be said about the population growth? A) There is unlimited growth, B) The growth is showing signs of slowing down C) The growth is declining.​

Answers

Answer:

B

Explanation:

A) There is unlimited growth is the correct answer.

Direction of curve

When the curve move upward it means that growth of population increases while on the other hand, if the curve comes down it means the population growth decreases so we can conclude that there is unlimited growth is the correct answer.

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Please only answer if you know and links will be reported

Answers

Answer:

C

Explanation:

the answer is C

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