What does the II next to an element mean?
Answers
The II next to elements represent the number of atoms which are joined together for forming a molecule.
The Roman numeral (II) if written next to an element then it denotes the oxidation state of the ion.
Let us assume that,
We need to represent the two atoms of an element Nitrogen, we can either denote it by writing NN or we can simply write N2.
Here 2 which is written in the subscript of an atoms denotes that for forming N2 two atoms of Nitrogens are used.
In some places, Roman numerals are also used.
In Chemistry Roman numerals like (I, II. III etc) are used for denoting the charge and the oxidation state of the transition metal ion.
Some common examples are Fe2+ and Fe3+.
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Related Questions
A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min
until you find a gas station.
Answers
Given :
A car drives 10 km with a speed of 72 km/hr and then runs out of gas.
Then you walk 2 km for the next 30 min until you find a gas station .
To Find :
The average speed of whole journey .
Solution :
Average speed is given by :
\(v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v_{avg}=\dfrac{10+2}{\dfrac{10}{72}+\dfrac{1}{2}}\\\\\\v_{avg}=18.78\ km/hr\)
Hence , this is the required solution .
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1. 9 m diameter and a mass of 270 kg. Its maximum angular velocity is 1600 rpm. A. A motor spins up the flywheel with a constant torque of 59 N*m. How long does it take the flywheel to reach top speed? B. How much energy is stored in the flywheel? C. The flywheel is disconnected from the motor and connected to a machine to which it will deliver energy. Half the energy stored in the flywheel is delivered in 2. 4 s. What is the average power delivered to the machine? D. How much torque does the flywheel exert on the machine?
Answers
(A) It takes about 339 seconds, or 5.65 minutes, for the flywheel to reach its maximum angular velocity. (B) The flywheel stores about 2.0 million joules of energy. (C) The average power delivered to the machine is about 417 kilowatts. (D) The flywheel exerts a torque of about 417 kilonewton-meters on the machine.
A. To find the time it takes the flywheel to reach its maximum angular velocity, we can use the formula: \(\Delta \omega =\frac{\tau \Delta t}{l}\)
Where Δω is the change in angular velocity, τ is the torque, Δt is the time, and I is the moment of inertia. Rearranging this formula gives: Δt = IΔω / τ
The moment of inertia of a solid cylinder is I = 0.5 m\(r^2\), where m is the mass and r is the radius. Substituting the given values, we get:
I = 0.5 (270 kg) \((0.95 m)^{2}\) = 119.9 kg \(m^{2}\)
Converting the maximum angular velocity to radians per second, we have: ω = 1600 rpm x 2\(\pi\) / 60 = 167.6 rad/s
The change in angular velocity is simply equal to the maximum angular velocity, so Δω = 167.6 rad/s. Substituting these values, we get:
Δt = (167.6 rad/s) (119.9 kg \(m^{2}\)) / (59 N m) ≈ 339 s
Therefore, it takes about 339 seconds, or 5.65 minutes, for the flywheel to reach its maximum angular velocity.
B. The kinetic energy stored in the flywheel is given by:
K = 0.5 I \(\omega^{2}\)
Substituting the given values, we get: K = 0.5 (119.9 kg \(m^{2}\)) \((167.6 rad/s)^2\)≈ 2.0 × \(10^6\) J
Therefore, the flywheel stores about 2.0 million joules of energy.
C. If half the energy stored in the flywheel is delivered in 2.4 seconds, then the delivered energy is:
E = 0.5 K = 0.5 (2.0 × \(10^6\)J) = 1.0 × \(10^6\) J
The average power delivered to the machine is simply the energy delivered divided by the time taken:
P = E / t = (1.0 × \(10^6\) J) / (2.4 s) ≈ 4.17 × \(10^5\)W
Therefore, the average power delivered to the machine is about 417 kilowatts.
D. When the flywheel is delivering energy to the machine, its angular velocity will decrease. The torque it exerts on the machine is given by:
τ = ΔK / Δt
where ΔK is the change in kinetic energy and Δt is the time taken. Since half the energy is delivered in 2.4 seconds, the change in kinetic energy is:
ΔK = 0.5 K = 1.0 × \(10^6\) J
Substituting the given values, we get:
\(\tau =\frac{(1.0\times J)}{(2.4\ s)}\approx 4.17\times N\ m\)
Therefore, the flywheel exerts a torque of about 417 kilonewton-meters on the machine.
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The picture below shows Earth:
A. rotating
B. revolving
C. orbiting
D. stopping
Answers
The figure shows about the rotating earth.
To find the correct option among all the options, we need to know about the rotation state of earth.
What is rotation of earth?Motion of earth about its own axis is known about its rotation motion.
How does rotation motion different from orbital or revolving motion?In revolving and orbital motion, an object moves around an axis out side of that bulk of object in a certain orbit, while in rotational motion, the object moves around its own axis.
How is rotation motion represented?Rotation motion is represented by drawing an axis in the bulk of object and to indicate the rotation a circular arrow is drawn.
Thus, we can conclude that the figure shows about the rotating earth.
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A thin lens is comprised of two spherical surfaces with radii of curvatures of 34.5 cm for the front side and -26.9 cm for the back side. The material of which the lens is composed has an index of refraction of 1.66. What is the magnification of the image formed by an object placed 42.6 cm from the lens?
Answers
The magnification of the image formed by the lens is -0.982.
To determine the magnification of the image formed by the lens, we can use the lens formula:
1/f = (n - 1) * (1/r1 - 1/r2)
Where f is the focal length of the lens, n is the refractive index of the lens material, r1 is the radius of curvature of the front surface, and r2 is the radius of curvature of the back surface.
Given that the radii of curvature are 34.5 cm and -26.9 cm, and the refractive index is 1.66, we can substitute these values into the lens formula to calculate the focal length.
Using the lens formula, we find that the focal length of the lens is approximately 13.54 cm.
The magnification of the image formed by the lens can be determined using the magnification formula:
m = -v/u
Where m is the magnification, v is the image distance, and u is the object distance.
Given that the object is placed 42.6 cm from the lens, we can substitute this value and the focal length into the magnification formula to calculate the magnification.
Substituting the values, we find that the magnification of the image formed by the lens is approximately -0.982.
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2) It takes an average 19,080 seconds for light to reach Pluto (Pluto's orbit varies quite a bit!). The
speed of light is in number 1. How far would Pluto be from the Sun at that particular point in its orbit
Answers
The average distance of Pluto is 3.7 billion miles or 5.9 billion kilometers, 39 astronomical units away from the Sun.
From a median distance of three.7 billion miles. Pluto is 39 astronomical units far away from the solar. One astronomical unit is the space from the solar to Earth. From this distance, it takes daylight five.
Mild from the solar takes about 5.5 hours to reach Pluto at its common distance (39. four AU). Pluto turned into founded in 1930 and turned at the beginning considered the ninth planet from the sun.
Sunlight travels at the rate of mild. Photons emitted from the surface of the sun want to travel across the vacuum of space to attain our eyes. the short solution is that it takes daylight an average of eight mins and 20 seconds to travel from the sun to the Earth.
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sort the facts into the category that they best describe sound waves and electromagnetic waves
Answers
Answer:
Sound waves have a low speed of 330 m/s
Sound waves are mechanical waves
Electromagnetic waves have a greater speed of 3.0×10^8 m/s
Electromagnetic waves are due to disturbance of electromagnetic objects.
How are you able to go up or down a "harmonic" in order to increase or decrease the numberof complete waves in a standing wave?tandin wave? How many waves are in a
Answers
2)
Waves can interfere constructively or destructively.
The points where a wave doesn't move are called nodes, and the wave interference at those points is destructive.
3)
A standing wave with minimum energy is created at a fundamental frequency f_1, and we can go up or down a harmonic by increasing or decreasing the frequency by discrete amounts of size f_1:
Each "loop" acounts for half a wave.
4)
Following the explanation given for the 3rd question, a 3-rd harmonic standing wave contains 1.5 complete waves, while a 6-th harmonic standing wave contains 3 complete waves.
I need help Will give five stars please show work please
Answers
Answer:
These has anwers and also the solution. You can recheck if you want.
The attractive force between two objects
that depends on their masses and the dis-
tance between them is _____?
Answers
Answer:
The answer is going to be gravitational force
What are three disadvantages of making and using plastic?
It pollutes the land and water.
It requires cutting down trees for raw materials.
It takes an incredibly long time to break down.
It freely conducts heat and electricity.
It isn’t easy to recycle.
Answers
Three disadvantages of making and using plastic are pollution, resource depletion, and poor recyclability. Plastic pollution poses a significant threat to the environment, as it can contaminate land and water bodies, harming wildlife and ecosystems. Additionally, plastic production relies on the extraction and processing of fossil fuels, contributing to resource depletion and climate change. Moreover, plastic takes an incredibly long time to decompose, leading to persistent waste accumulation.
Plastic production contributes to pollution through various stages of its life cycle, including extraction, manufacturing, and disposal. The improper disposal of plastic waste can result in land and water pollution, impacting habitats and biodiversity.
Furthermore, the extraction and processing of raw materials, such as oil and gas, for plastic production contribute to greenhouse gas emissions and climate change.
Plastic's dependence on fossil fuels also leads to resource depletion and contributes to the finite availability of these non-renewable resources.
Additionally, plastic's long decomposition time, which can range from hundreds to thousands of years, results in a build-up of plastic waste in landfills, oceans, and other environments.
Moreover, plastic recycling presents challenges due to the wide variety of plastic types, each with different properties and recycling processes. This complexity makes it difficult to efficiently and effectively recycle plastic, leading to a significant portion of plastic waste ending up in landfills or being incinerated, further exacerbating environmental issues.
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The symbol “g” can be used to refer to the acceleration due to gravity. “g” can also have another unit. Which of these is also a unit of “g”?
A- J/kg
B- J/kg2
C- N/kg
D- N/kg2
Answers
The symbol “g” can be used to refer to the acceleration due to gravity. “g” can also have another unit. N/kg, is the another unit used to represent "g".
The correct answer is option C.
The unit of "g" that is also used to represent another unit is option C, N/kg. In physics, the symbol "g" is commonly used to represent the acceleration due to gravity, which is approximately 9.8 m/s² on the surface of the Earth. This means that every kilogram of mass experiences a force of 9.8 Newtons when subjected to Earth's gravitational field.
The unit N/kg represents the Newton per kilogram, which is the unit of gravitational field strength or gravitational acceleration. This unit describes the force experienced by a mass per unit mass. In other words, it represents the gravitational force acting on each kilogram of mass.
To understand this concept, let's consider the formula for gravitational force:
F = m * g
where F is the force, m is the mass, and g is the gravitational acceleration. In this equation, the unit of force is Newtons (N), and the unit of mass is kilograms (kg). Therefore, to have consistent units, the gravitational acceleration "g" must have the unit N/kg.
Option A, J/kg, represents the unit of energy per unit mass, which is the joule per kilogram. Option B, J/kg², represents the unit of energy per unit mass squared, which is not directly related to the gravitational acceleration. Option D, N/kg², represents the unit of force per unit mass squared, which is also not directly related to the gravitational acceleration.
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A proton falls through a potential drop of 400 v. how much is the change of potential energy of this proton in falling through this potential drop?
Answers
Change in potential energy of the proton= (1.6 × 10^-19 C) × (400 V)
To calculate the change in potential energy of the proton, we need to use the formula:
The change in potential energy of a proton can be described as the difference in its stored energy when transitioning from one position to another within an electric field. Potential energy is directly related to the distance between charged particles.
As the proton moves closer to a positively charged object or further away from a negatively charged object, its potential energy increases. Conversely, if the proton moves away from a positively charged object or closer to a negatively charged object, its potential energy decreases.
This change in potential energy is a result of the electric force acting on the proton, with the magnitude of the change depending on the distance and the strength of the electric field.
Change in potential energy = Charge of the proton (q) × Potential difference (V)
The charge of a proton is 1.6 × 10^-19 C (Coulombs), and the potential difference is given as 400 V.
Change in potential energy = (1.6 × 10^-19 C) × (400 V)
By multiplying these values, we can find the change in potential energy.
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Which of the following is a definition of acceleration? *
Answers
Answer:
Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
What is the angular momentum of the moon around the earth? the moon’s mass is 7.4 * 1022 kg and it orbits 3.8 * 108 m from the earth.
Answers
The angular momentum of the moon around the earth is 2.92 * \(10^{34}\) kg \(m^{2}\)/s
Angular momentum a vector quantity that is a measure of the rotational momentum of a rotating body or system, that is equal in classical physics to the product of the angular velocity of the body or system and its moment of inertia with respect to the rotation axis, and that is directed along the rotation axis.
m (mass of moon ) = 7.4 * \(10^{22}\) kg
orbit = 3.8 * \(10^{8}\) m
L = I ω
= m \(r^{2}\)ω
= 7.4 * \(10^{22}\) * \((3.8 *10^{8} )^{2}\) * (2π / 27 * 24 * 3600)
= 2.92 * \(10^{34}\) kg \(m^{2}\)/s
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Danielle is doing some diy. she uses a 1.2kw electric saw for 20 minutes and then a 1000w electric sander for half an hour. which job is the more expensive in terms of electricity used - sawing or sanding?
Answers
Based on the calculations, the electric sander (sanding) is the more expensive in terms of electricity used.
How to determine the more expensive?Mathematically, the quantity of energy consumed by an electrical device can be calculated by using this formula:
Energy consumption = power × time
For the electric saw, we have:
Power = 1.2 kW = 1.2 × 1000 = 1,200 Watts.Time = 20 minutes.Substituting the given parameters into the formula, we have;
Energy consumption = 1,200 × 20
Energy consumption = 24,000 Joules.
For the electric sander, we have:
Power = 1000 Watts.Time = half-hour = 30 minutes.Substituting the given parameters into the formula, we have;
Energy consumption = 1,000 × 30
Energy consumption = 30,000 Joules.
Therefore, the electric sander (sanding) is the more expensive in terms of electricity used.
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Answer: sanding
Explanation:
Energy used by saw = power × time = 1,200W × 1,200s = 1,440,000J.
Energy used by sander = power × time = 1,000W × 1,800s = 1,800,000J.
The sander uses more energy.
Basic design elements include (Check 7)
What are the 3 properties of color? Immersive Reader
depth, shade, fragrance
value, hue, depth
saturation, hue, chroma
hue, value, intensity
Answers
Answer: depth, shade, fragrance
Explanation:
which is an example of non-renewable energy source?
a. petroleum
b. Solar energy
c. wind energy
d. geothermal energy
Answers
Answer:
Petroleum
Explanation:
Because Petroleum reservoirs can be depleted but something like wind energy wind will always be there
Answer: Petroleum
Explanation: Have a Good day!!
Alvin and Theodore race across a parking lot 451 cm long. Alvin travels at 19.28 cm/s and Theodore at 12 cm/s. When the Alvin crosses the finish line, how far behind is Theodore?
Answers
Theodore is 170 centimeters from the finish line when Alvin crosses it.
The total distance is 451 cm, so we can find the time that takes Alvin to crosses the finish line as follows:
\( v_{a} = \frac{x}{t} \) (1)
Where:
\( v_{a}\): is the speed of Alvin = 19.28 cm/s
x: is the total distance = 451 cm
t: is the time that takes Alvin to crosses the finish line =?
By solving equation (1) for t, we have:
\(t = \frac{x}{v} = \frac{451 cm}{19.28 cm/s} = 23.4 s\)
Now, after 23.4 seconds have elapsed, Theorode has traveled the following distance (\(x_{t}\)):
\( x_{t} = v_{t}*t \)
Where:
\(v_{t}\): is the speed of Theodore = 12 cm/s
\( x_{t} = v_{t}*t = 12 cm/s*23.4 s = 281 cm \)
The distance (d) that Theodore needs to travel to cross the finish line is:
\(d = x - x_{t} = 451 cm - 281 cm = 170 cm\)
Therefore, Theodore is 170 centimeters from the finish line when Alvin crosses it.
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What is Diabetic Retinopathy? Describe it in at least 1 paragraph.
Answers
Answer:
Diabetic Retinopathy is a form of diabetes that affects the eyes. It can be caused by damage to the retinas, and can cause permanent damage to the eyes, and even blindness. Initially the patient is asymptomatic and become more visibly affected in later stages. It can be treated if caught early, or in mild cases.
Explanation:
A 0.5 kg cheeseburger is lobbed at a particularly unhappy customer with a force of 10 N.
While it is being thrown, what is the acceleration experienced by the cheeseburger?
Answer in units of m/s2
Answers
If Brett and Chris are trying to move a piano and Brett pushes the piano with 25 N of force and Chris pulls the piano in the same direction with 20 N of force what is the net force
Answers
Answer:
45 N
Explanation:
From the question given above, the following data were obtained:
Force applied by Brett = 25 N
Force applied by Chris = 20 N
Net force =?
From the question given above, Brett and Chris applied force to the piano in the same direction. Thus the net force acting on the piano will be the sum of the forces applied by Brett and Chris. This can be obtained as follow:
Force applied by Brett = 25 N
Force applied by Chris = 20 N
Net force =?
Net force = 25 + 20
Net force = 45 N
when an airplane leaves the runway, its angle of climb is 15° and its speed is 275 feet per second. find the plane’s altitude relative to the runway in feet after 1 minute.
Answers
speed is 275 feet per second 275×60 = 16500 ft. 16500×Sin15° = 4270.51 ft (app.)
answer is 4270.51
How do you determine an airplane's speed?
the Mach Number.
Formula:
Mach Number = Sound Speed / Aircraft Speed (dependent on altitude)
Example:
The speed of sound at 30,000 feet is equal to 589.4 knots as the aircraft flies. There are 489.3 knots of airspeed.
Calculate: 0.83 Mach = 489.3/589.5.
How is the distance climbed determined?
We can determine the horizontal distance we will cover throughout the ascent given that we know how long it will take:
Ground speed multiplied by climbing time equals horizontal distance.
Using the previous formulas:
rise in altitude = 4000 - 1000 = 3000 ft.
3000 divided by 600 equals 5 minutes for the ascent.
10 NM is the horizontal distance at 120 * 5/60.
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If an unbalanced force of 25 newtons acts on an object that accelerates at 2.5 meters
per second squared, what must be the mass of the object?
A.) 1.0 kg
B.) 10 kg
C.) 13 kg
D.) 63 kg
Answers
Answer:
B
Explanation:
B. Must be the answer I. E 10kg
Which of the following is fundamentally different from the others?
Answer
X-rays
gamma rays
sound waves
light waves
radio waves
Answers
Fundamentally, sound waves differ from other waves.
Electromagnetic waves include radio waves, light waves, and X-rays.
Which of the following wave types differs fundamentally from the other four?Which of the following stands apart from the others fundamentally? Reasoning: Mechanical waves are what make up sound. The remaining responses involve EM waves, which are NOT mechanical waves.
What distinguishes radio waves from light waves in their fundamental properties?Light and radio waves are both electromagnetic waves; their primary distinction is in their frequency. While the oscillations of the electrons within atoms produce light waves, radio waves are produced by the acceleration of electrons in a radio antenna.
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why do all stars spend most of their lives on the main sequence?
Answers
All stars spend most of their lives on the main sequence is a result of it having enough hydrogen which is an important component and acts as the fuel for energy production used to ensure it remains in the main sequence.
Every star has a lot of hydrogen and which is a vital element every star has lots as it encourages the burning of hydrogen into helium which helps to put the stars in the main sequence during most of their lives.
The mass of the stars is also a determinant factor as the more mass a star the more amount of Hydrogen it uses and the less time it takes to remain in the main sequence.
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Imagine that someone is injured, and their somatic nervous system is impacted. Would this be a life-threatening injury?
A.
Yes, that covers essential internal injuries.
B.
No, that is a minor part of how the body functions.
C.
Probably not since that system deals mostly with mobility.
D.
It is highly likely because that controls the brain and the spine.
Answers
Answer:
C. Probably not since that system deals mostly with mobility.
Explanation:
what causes spring and neap tides, and identify the phases of the moon when these tides occur. Be sure to mention what happens to Earth’s crust, ocean water, and the positions of the Sun, Earth, and the moon?
Answers
Answer:
Spring tides occur when the moon is full or new. Earth, the moon, and the Sun are in a line. The moon’s gravity and the Sun’s gravity pull Earth’s crust and ocean water. This causes tides to be higher than normal.
At neap tide, the moon and the Sun are at right angles to each other. This happens during the first and third quarters of the lunar cycle. At neap tide, the Sun’s gravity and the moon’s gravity are balanced. High tides are lower; low tides are higher.
which list includes translucent objects only
Answers
Objects that let in light and blurry images are translucent.
Translucent is a term that refers to an adjective. This characteristic is the property of an object to allow the passage of light, without allowing visibility with high clarity through it.
This term is often confused with transparency. However, they differ because a transparent object lets light through easily and allows you to see clearly through it.
According to the above, objects that allow light to pass through but do not allow clear vision are translucent.
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why is alcohol used as thermometric liquid?
Answers
Answer:
Ohayo, Haruki-kun here!
The answer is, alcohol thermometer uses alcohol as the liquid to measure the temperature variations. Alcohol expands when it absorbs temperature and contract in colder temperatures. Most commonly used alcohol in these is ethanol, but different types of alcohols can be used depending on the measured temperature and environment in which the measurements are taken.
Explanation:
3. Since Aspeon is not expected togrow, Emily believes that the following equations can be used in the valuation analysis: (1) S=[EBIT−kd(D)](1−ks)
(2) V=S+D
(3) P=(V−D0)/n0
(4) n1=n0−D/P
(5) VL=VU+TD
Answers
The equations mentioned by Emily in the valuation analysis for Aspeon are as follows:
1) Equation (1): This equation represents the value of equity (S) and calculates it based on the EBIT (earnings before interest and taxes), the tax shield provided by debt (D), and the required return on debt (kd) and equity (ks). It implies that the value of equity is equal to the adjusted EBIT after deducting the tax shield from debt.
2) Equation (2): This equation calculates the total enterprise value (V) by adding the value of equity (S) and debt (D). It represents the total worth of the company, considering both equity and debt.
3) Equation (3): This equation calculates the price per share (P) by dividing the total enterprise value (V) minus the initial debt (D0) by the number of shares (n0). It represents the price per share based on the valuation of the company.
4) Equation (4): This equation calculates the new number of shares (n1) by subtracting the dividend (D) from the initial number of shares (n0) divided by the price per share (P). It represents the adjusted number of shares after the payment of dividends.
5) Equation (5): This equation calculates the levered value (VL) by adding the unlevered value (VU) with the tax shield value (TD). It represents the value of the company after considering the tax advantages of debt.
These equations provide a framework for valuation analysis, considering factors such as earnings, taxes, debt, and equity. They help assess the value and financial implications of Aspeon's growth prospects.
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