How Do Hydrogen Fuel Cell Vehicles Work? Fuel cell vehicles use hydrogen gas to power an electric motor. Unlike conventional vehicles which run on gasoline or diesel, fuel cell cars and trucks combine hydrogen and oxygen to produce electricity, which runs a motor.
Hydrogen for fuel cell vehicles can be produced primarily through steam methane reforming (SMR) and electrolysis of water.
Hydrogen for fuel cell vehicles can be produced in several ways, but two main methods are currently predominant:
Steam methane reforming (SMR):
A common method where methane from natural gas reacts with steam under high pressure and temperature in the presence of a catalyst to produce hydrogen, carbon monoxide, and a small amount of carbon dioxide.
Electrolysis of water:
An electric current is passed through water to separate it into oxygen and hydrogen. This method can use electricity generated from renewable sources, such as wind or solar power, making it a potential zero-carbon process for hydrogen generation.
The nucleus of an atom emits a particle. The particle is equal in size to a helium nucleus. What is this particle? A) an alpha particle
B) a beta particle
C) a Newton
D) a gamma ray
Answer:
A) Alpha particle
Explanation:
An alpha particle is identical to a helium nucleus, since consists of 2 protons and 2 neutrons.
The charge of an alpha particle is +2e and its mass is 4 a.m.u.
Alpha particles are produced in alpha decays. Alpha decays occur when a nucleus emits an alpha particle: as a result, the atomic number of the nucleus decreases by 2 units, while its mass number decays by 4 units.
The equation that represents an alpha decay is
[tex]_Z^AX \rightarrow _{Z-2}^{A-4}Y+_2^4 \alpha[/tex]
Why is coal costly to produce?
1.coal is found deep underground.
2. Coal is expensive to make
3. Coal is only found in certain places on earth.
4. Coal is difficult to make in the lab.
It should be the first answer. I'm sorry if it's wrong
Coal production is costly because coal is found deep underground, necessitating expensive mining operations. Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and 3. Coal is only found in certain places on earth.
Coal production is costly primarily because coal is found deep underground. This necessitates extensive and expensive mining operations to extract the coal.
There are two main methods of coal mining:
Surface mining: This involves removing the topsoil to access coal seams close to the surface. It is cheaper but causes significant environmental damage.Underground mining: This method is used for coal that is deep beneath the Earth's surface. It involves digging tunnels and is more hazardous and costly due to safety concerns and complex machinery.Furthermore, transporting the mined coal to power plants or industrial sites adds to the cost. Lastly, coal processing, which involves cleaning and removing impurities, adds another layer of expense.
Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and 3. Coal is only found in certain places on earth.
In 2012, astronomers reported the discovery of a planet that revolved around two Sun-like stars. Kepler-34b, a gaseous planet, revolves around the stars every 289 days, and the stars revolve around each other every 28 days. This information was presented in the January 11, 2012, issue of the journal Nature. Based on the information in the article, which title would be most appropriate? New Planet Found in Open Cluster System New Planet Discovered in Binary Star System Discovery: New Globular Cluster and Planet Discovery: Star System Orbiting New Planet
The most appropriate title would be " New Planet Discovered in Binary Star System ".
This title doesn't have enough glitz and glamour to be the headline of the same information in a newspaper ... as they say, it wouldn't "sell papers". So a headline writer would have to make up a gripping, understandable, grabbing, popular, slightly misleading headline for it.
But the kind of people who read Nature don't need to be baited or tricked into reading something. They're already interested in the subject, and they may be people who work in researching it. They read that journal to keep up with what's happening with things they're already interested in.
Remember ... part of the modern Scientific Method is to let other scientists know all about what you're doing and what you're finding. Nature is one of the places where real scientists do that.
Answer:
New Planet Discovered in Binary Star System
Explanation:
Kinetic friction is affected by the weight of the object. TrueFalse
Answer;
The above statement is True
Kinetic friction is affected by the weight of the object.
Explanation;Kinetic friction is a force that acts between moving surfaces. An object that is in motion over a surface experiences a force in the opposite direction to the direction of movement.The equation for kinetic friction is given by the formula;F= coefficient of friction * Normal force.
Normal force is the force of the table pushing back on the block and can be calculated by formula;F = mass* acceleration due to gravity.
Therefore, the weight of an object determines its kinetic friction.Answer:
The answer is True. Friction is indeed affected by weight.
Explanation:
If you can’t open the lid of a jelly jar what should you do?
If I can't open the lid of a jelly jar, I'd keep trying and if I can't open the lid of a jelly jar after the MANY tries I took, I'd ask for help.
Hit in the center of the top, and it will let some air out, that will make it easier.
Compared to its weight on Earth, a 10-kg object on the moon will weigh Question 9 options: less. the same amount. more.
it will weigh less on the moon.
ANY object will weigh 83% less on the Moon than weighs on Earth.
Your 10kg rock weighs 98N (22.4 lbs) on Earth and 16N (3.6 lbs) on the Moon.
To turn a coil of wire into a magnet, run a(n) ____ through it.
A.) Electromagnetic Current
B.) Magnetic Field
C.) Electric Current
D.) None of these
A.) Electromagnetic Current
please mark me as the brainliest
According to the law of universal gravitation, as mass increases, gravity
As distance
increases, gravity
According to the Law of Universal Gravitation (applying to all things in the universe, hence "universal"), all objects attract each other through gravitational force. ... As mass increases, gravity increases (related linearly) because there is a stronger attraction between objects with more "stuff" (matter).
Courtney wants to test an unknown chemical solution. What test should courtney perform to determine wheather the chemical is an acid or base
Courtney should carry out an acid-base titration, adding a known concentration of an acid or base to the unknown solution until neutrality is achieved, indicated by a colour change in an indicator or a pH measurement. Acids produce H3O+ or H+ ions, while bases produce OH- ions. The volume of known solution added to reach neutrality can help determine the nature and strength of the unknown solution.
Explanation:For Courtney to determine whether an unknown chemical solution is an acid or a base, she should perform an acid-base titration. In this process, a solution of an acid or base with a known concentration, often referred to as the titrant, is slowly added to the solution with an unknown concentration, the analyte, until neutrality has been achieved. Indicator substances such as phenolphthalein, which changes colour based on pH, or a pH meter can be used to determine when this point of neutrality, called the equivalence point, has been reached.
For instance, if Courtney had a known concentration of sodium hydroxide (NaOH), a base, she would add this to the unknown solution until her phenolphthalein indicator changes colour, indicating all the acid in the solution had been neutralised. The amount of NaOH added helps determine whether the unknown solution was acidic, and to what degree.
It's important to remember that acids produce H3O+ or H+ ions in a solution, while bases produce OH- ions. This knowledge can also aid in further understanding of the titration results.
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The soymilk is most likely a ____.
If you're referring to this question :
A container of soymilk has the instruction on its label to "shake well before opening." The soymilk is most likely a !suspension!
Suspension is the answer.
Hope this helps,
Davinia.
Human dignity and worth and social justice are
Human dignity and worth and social justice are TWO OF THE BASIC VALUES OF THE CODE OF ETHICS FOR SOCIAL WORK.
Social workers are those professionals, who promote social change by helping to relieve hardship and suffering. Social work is committed to five basic values, which are:
1. Human dignity and worth
2. Social justice
3. Service to humanity
4. Integrity
5. Competence.
The human dignity and self worth value holds that all human beings have intrinsic value, right to well being, right to self fulfillment and control over their own lives.
The social justice value states that there should be fair and equitable distribution of resources to meet basic human needs and all citizens should have access to public resources in order to achieve full potential.
If 500 J of energy were added to 1 kg of each of these samples , which would experience the LEAST temperature increase
What does "which" mean ? Does it mean to pick the right one out of a list that you're hiding from us ?
There's no way we can begin to make a choice if we don't know WHAT the samples are samples OF.
I CAN give you some info, however, that will probably help you make the right choice from the hidden list that you have.
If water is on the list, then that's the answer, EXCEPT if liquid ammonia is on the list. Liquid ammonia is the only known substance on Earth that beats water as the answer to this question.
If neither liquid ammonia NOR water is on your secret list of samples, then you're on your own, Bunky.
Answer: if you are on usa test prep the answer is aluminum
Explanation:
If the input force on a simple machine is 2 N and the output force is 4 N, what is it’s mechanical advantage?
Explanation:
Given that,
Input force on a simple machine, F = 2 N
The output force on a simple machines, F' = 4 N
The ratio of the output force to the input force of any simple machines is called its mechanical advantage. Mathematically, it is given by :
[tex]m=\dfrac{F'}{F}[/tex]
Putting the value of F and F' in above equation. We get :
[tex]m=\dfrac{4}{2}[/tex]
m = 2
So, the mechanical advantage of the simple machines is 2. Hence, this is the required solution.
Answer:
Mechanical advantage, m = 2
Explanation:
Given that,
The input force on a simple machine, [tex]F_i=2\ N[/tex]
The output force on a simple machine, [tex]F_o=4\ N[/tex]
To find,
The mechanical advantage of the simple machine.
Solution,
The ratio of the output force to the input force of any simple machines is called its mechanical advantage. Its expression is given by the below formula :
[tex]m=\dfrac{F_o}{F_i}[/tex]
[tex]m=\dfrac{4}{2}[/tex]
m = 2
Therefore, the mechanical advantage of the simple machines is 2.
if i contain 3 moles of gas in a container with a volume of 60 liters and at a temperature of 400 k, what is the pressure inside the container?
Answer:
[tex]1.66\cdot 10^5 Pa[/tex]
Explanation:
The ideal gas equation states that:
[tex]pV=nRT[/tex]
where
p is the gas pressure
V is the gas volume
n is the number of moles of the gas
R is the gas constant
T is the absolute temperature of the gas
For the gas in this problem, we have:
[tex]n = 3 mol[/tex] (number of moles)
[tex]V=60 L=60\cdot 10^{-3} m^3[/tex] (gas volume)
[tex]T=400 K[/tex]
So we can solve the formula for p, the pressure of the gas:
[tex]p=\frac{nRT}{V}=\frac{(3 mol)(8.314 J/mol K)(400 K)}{60\cdot 10^{-3} m^3}=1.66\cdot 10^5 Pa[/tex]
rank the work done on the charged particles from highest to lowest
Answer:
correct order of work done is given as
2 > 3 > 4 > 1
Explanation:
When positive charge is dragged opposite to electric field then in that case work done is positive while if negative charge is dragged opposite to electric field then the work done is negative
So here we will have
positive work for charge 2, 3 and 4 while for negative charge particle 1 the work done is negative
now here we also know that work done is product of force and displacement
so here work depends on displacement of charge particle
maximum displacement is force particle 2
minimum is for particle 4
so correct order of work done is given as
2 > 3 > 4 > 1
Answer:
2, 3, 4, 1
Explanation:
on edg
Kiley, Jermaine, and Gunther are playing tug-of-war. Kiley and Jermaine are on the same side of the rope, and Gunther is on the other side. Kiley is exerting a force of 20 N, and Jermaine is exerting a force of 25 N.
Which force would result in a balanced force for the game?
-45N because you add the side together and make it equal 0
Kiley and Germaine pull together, resulting in a force of 45N which pulls the rope that way ===> .
In order to balance the forces on the rope, Gunther must pull the rope with a force of 45N this way <===, all by himself.
The net force on the rope will then be zero, and the rope will not accelerate. (Although the tension inside the rope will be 90N.)
By the way . . . I'd love to see how the kids manage to all get on the "sides" of the rope. I would have expected them to just do it the easy way and stand at the "ends" of the rope.
Which of the following best describes the behavior of silica rich magma
A. Highly viscous and associated with violent eruptions
B. Highly viscous and associated with quiet volcanic eruptions
C. Stays deep within earth because of low viscosity
D. Cannot flow but is limited to fixed areas of hotspot volcanism
Answer:
A. Highly viscous and associated with violent eruptions
Explanation:
Most silica rich magma have high viscosity and huge amount of trapped gases within them. As they continue to upwell and expand, the gases causes violent eruptions near Volcanoes. Most granitic/rhyolitic magma are silica rich.
Answer: Option (A)
Explanation: Silica rich magma are those in which the magma has more than 65 % of silica content. The higher the silica content, the higher is its viscosity i.e viscosity of a magma is directly proportional to the silica content of magma.
This highly viscous magma inside the volcanoes moves sluggishly and mostly gets concentrated in the vents and seals them. With time, when the pressure exerted by the magma is too high, it creates violent eruptions through the vents.
Thus, the correct answer is option (A).
An object moving in a circle is represented by the motion map. Based on the map, at which point is the object accelerating toward the right?
Answer:
The answer is Z
Explanation:
Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him. How is the pulley helping Adam lift the object?
A. A fixed pulley lowers the amount of force needed to do the same amount of work.
B. A fixed pulley increases the distance over which the force is applied.
C. A fixed pulley helps Adam change the direction of the effort force.
D. All of these answers are correct.
A is the correct answer
Do gamma rays have lower or higher frequency than microwaves
Gamma rays have extremely shorter wavelengths than microwaves and therefore have higher frequencies.
Gamma rays have a higher frequency than microwaves. In the electromagnetic spectrum, the frequency and energy increase from radio waves to gamma rays. Gamma rays are the most energetic, and microwaves are on the lower energy end of the spectrum.
Explanation:Gamma rays have a higher frequency than microwaves. In the electromagnetic spectrum, frequency and energy increase from radio waves to gamma rays, making gamma rays the most energetic form of electromagnetic waves. Simply put, gamma rays' frequency is higher and their wavelength is shorter than microwaves.
Microwaves are on the lower energy end of the spectrum, used in applications such as cooking and telecommunications. They have a frequency ranging from about 10⁹ Hz to 10¹² Hz.
Shortly, gamma rays are nuclear in origin and encompass the highest-frequency electromagnetic radiation of any type, meaning they have a higher frequency than microwaves.
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For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have? A. 13 B. 14 C. 26 D. 27 E. 40
Answer:
B. 14
Explanation:
For an element:
- Atomic number: is the number of protons in the nucleus (p)
- Mass number: it is the number of protons (p) + neutrons (n) in the nucleus
For Al (aluminium), we have:
p = 13
p + n = 27
Substituting the first equation into the second one, we find the number of neutrons:
n = 27 - p = 27 - 13 = 14
Answer:
14
Explanation:
plato
Which of the following is a unit used to express volume? A. gram B. kilogram C. centimeter D. cubic centimeter
D because any answer to volume has to be cubed.
HELP ME !!!! A.S.A.P!!!!! WILL BE MARKED AS BRAINLEST!!! 15 POINTS!!!!
Magnets A and B are of equal magnetic strength. In which position will magnets A and B have the greatest attractive force toward each other?
A
B
C
D
C is the correct answer. Opposites attract!
In choice C, the two magnets are closer together so it wouldn't have much attractive force. Whereas, in choice D, the two magnets are further apart so it might have the greatest attractive force.
If I were you, I would choose D, but I suck at school so it probably isn't D.
_____ theory led to the development of the theory of plate tectonics.A.Continental driftB.ThermodynamicC.Seafloor spreading
The theory is A. continental drift.
Explanation:The lithosphere which is the outermost layer of the planet is broken into pieces called tectonic plates. In this scientific theory called plate tectonics, seven large and greater number of small plates are broken and moved separately. This theory is based on the concept of continental drift.
In the geologic time, continents shift their position from the earth's surface. Similar fossils found on different continent's shores prove us that the continental drift is nothing but truth.
Need help on the first and second one
One
d = 400 m
t = 20 s
speed = ?
speed = 400 / 20
speed = 20 meters/second
Two
d = 50 meters
t = 10 seconds
speed = 50 meters / 10 seconds
speed = 5 meters / second
4. What happens when the temperature of an object increases? a. The object’s particles move close together b. The number of the object’s particles increases c. The object’s particles move faster d. The object’s particles stop moving
c the objects particles move faster
Answer: c.The object’s particles move faster
Explanation:
When the temperature of an object increases, the particles of that object gain kinetic energy and move faster.
Kinetic energy is related to motion. If an object has multiple particles, as faster they move, they will collision with each other.
So, the speed of the particles is related to the temperature. (And also the mass of the particle)
The builder of a house on a cliff overlooking the ocean should be concerned about what geologic phenomenon
Final answer:
Builders should be concerned about erosion, mass wasting, and slope instability when constructing homes on cliffs, with particular risks including landslides and tsunamis arising from geological vulnerabilities and ocean dynamics.
Explanation:
The builder of a house on a cliff overlooking the ocean should be concerned about geologic phenomena such as erosion and mass wasting processes. Ocean waves incessantly weather away at the land, creating sea cliffs that become prime areas for concerns about stability. Particularly, the undercutting action of the sea can lead to portions of the cliff collapsing, and additional mass wasting can occur as higher rocks calve off. Notably, the construction of buildings on steep slopes can influence nearby slope instability due to changes in drainage, which further compounds these concerns.
Geologic factors such as rock bedding, fracturing, and foliation are structural weaknesses that can be exacerbated by this process, increasing the risk of landslides. Furthermore, when building in coastal areas, one must also consider the potential risk from tsunamis, such as the hypothesized collapse of volcanic island slopes that could generate massive waves. Thus, attention to elements like coastal erosion, wave-cut platforms, and tectonic activity is crucial during the planning and building phase to mitigate potential disasters.
Which of the following statements is true? -The sun will eventually die, but it will not affect Earth.
- The sun uses its own matter to create light and heat.
-The sun is a rare G2 star, which means it is extremely bright.
-The photosphere is only visible during a total solar eclipse.
I think the true option is "The sun uses its own matter to create light and heat."
Answer:
- The sun uses its own matter to create light and heat.
Explanation:
Sun is composed of gases majorly Hydrogen and Helium. In the core, the hydrogen atoms fuse to form helium atoms. This nuclear fusion reaction in the core produces huge amount of energy in the form of heat and light.
Thus, the statement that sun uses its own matter to create light and heat is true.
Sun is a G2 star. It is not a rare star. It is appears extremely bright because it is closer to earth. Else, it has a average brightness.
When we look at the sun, we actually view the photosphere. chromosphere is only visible during a total solar eclipse.
The sun would eventually die and in this process, it would become red giant expand and engulf the earth. Finally its core would form a white dwarf.
It takes a truck 3.56 seconds to slow down from 112 km/h to 87.4 km/h. What is its average acceleration?
1.92 m/s2
−1.92 m/s2
−6.81 m/s2
6.81 m/s2
Answer:
option B
−1.92 m/s2
Explanation:
Given in the question,
time took by truck to slow down = 3.56 sec
initial speed of truck = 112 km/h
final speed of truck = 87.4 km/h
1 km/h = 0.277778 m/s
112 = 31.1 m/s
87.4 = 24.28 m/s
Formula use to calculate the acceleration
v - u = at
where v is final speed
u is initial speed
a is acceleration
t is time
plug values in the equation
24.28 - 31.1 = a(3.56)
-6.8 = a(3.56)
a = -6.8 / 3.56
a = -1.9 m/s²
How does the thermal energy of a large container of water compare to a small container of water at the same temperature
The large container warms slower than the smaller container because of the amount of space . Both can warm to the same temperature tho just one takes longer than the other . Can I please be marked as brainliest! Have a great day !
The larger container warms up slower than the small one