The balanced chemical reaction is
2K + 2H2O--- H2 + 2KOH
What is a chemical equation?A chemical equation is described as the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.
From the example, if we follow the stoichiometry of the reaction , 2 moles of potassium metal reacts with 2 moles of water to give 1 mole of hydrogen gas and 2 mole potassium hydroxide.
The chemical equation is very important as it tells us about the reacting species and resulting product.
The coefficient of the reacting species and resulting products gives information about the mole ratio or molecular ratio of the elements or compounds in the reaction.
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A plastic-foam container used as a picnic cooler contains a block of ice at 0°C. If 225g of ice melts, how much heat passes through the walls of the container?
To determine the amount of heat passing through the walls of the container, we can calculate the rate of heat transfer through conduction using the formula q = k * A * (T2 - T1) / d. Once we have the rate of heat transfer, we can multiply it by the time to find the total heat transferred.
Explanation:To determine how much heat passes through the walls of the container, we need to calculate the heat transfer through conduction. The rate of heat transfer can be calculated using the formula q = k * A * (T2 - T1) / d, where q is the heat transfer, k is the thermal conductivity of the material, A is the surface area, T2 is the temperature outside the container, T1 is the temperature inside the container, and d is the thickness of the walls. We can then multiply the rate of heat transfer by the time to find the total heat transferred. In this case, the temperature outside the container is 35.0°C and the temperature inside the container is 0°C.
Let's calculate the heat transfer rate:
q = k * A * (T2 - T1) / d
Assuming the thermal conductivity of the plastic-foam material is known and given, we can substitute the values into the equation and calculate the rate of heat transfer. Once we have the rate of heat transfer, we can multiply it by the time to find the total heat transferred.
What is the power of 10 when 157,821 is written in scientific notation?
Answer:
The power of 10 in the given value is 5.
Explanation:
scientific notation is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.
Answer:
1.57821 * 10^5 (5)
Explanation:
Scientific notation is defined as the representation in which a number is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.
We are given a numerical value of 157,821
Converting this into scientific notation, we get:
Hence, the power of 10 in the given numerical value is 5.
What is the fuel of an aeroplane.?
Answer: Jet fuel
Explanation:
Jet fuel is a clear to straw-colored fuel, based on either an unleaded kerosene (Jet A-1), or a naphtha-kerosene blend (Jet B). Similar to diesel fuel, it can be used in either compression ignition engines or turbine engines.
Answer:
the fuel of an aeroplane is called gasoline
H2O
Given the chemical formula, how is this substance MOST LIKELY classified?
A) atom
B) compound
C) both atom and compound
D) neither atom nor compound
Answer:
C
Explanation: Because its water, self explainitory.
What is the relationship between the masses of the objects and the gravitational force between them?
Answer:
Gravitational force is directly proportional to the masses of the objects.
Explanation:
Human impact on ecosystems would most likely lead to secondary succession over primary succession.
Please select the best answer from the choices provided
T
F
Answer:
True
Explanation:
The given statement is true.
Secondary succession refers to the series of community changes that take place on previously established but damaged or disturbed habitat.
It helps in reviving or re-establishment of the similar ecosystem that previously existed.
It starts by a disturbing event such as natural disaster (hurricane, tornado, earthquake et cetera) and human interventions (deforestation, accidental forest fires caused by human activities, habitat destruction due to mining or dam construction et cetera) which greatly reduce the ecosystem already established.
Human impact on ecosystems often leads to secondary succession rather than primary succession.
Explanation:In ecosystems, primary succession occurs in areas that were previously devoid of life, such as newly formed volcanic islands or bare rock surfaces. Secondary succession, on the other hand, occurs in areas that have been disturbed but still retain some soil or remnants of the original community.
Human impact on ecosystems often leads to disturbances such as deforestation, fires, or agriculture. These disturbances create conditions for secondary succession rather than primary succession, as there is generally still some soil and seed bank present.
For example, if a forest is clear-cut, the remaining soil and seeds in the area can allow for the regrowth of vegetation, leading to secondary succession.
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In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction and breaking) Check all that apply.
Child on a swing
Pendulum
Bow and Arrow
Roller Coaster
Mechanical energy is conserved in all the four situations
Explanation:
The law of conservation of energy states that in absence of non-conservative forces (such as air resistance of friction), the mechanical energy of an object is conserved.
The mechanical energy of an object is the sum of its potential energy (PE) and its kinetic energy (KE):
E = PE + KE = const.
In all the situations described, there are no air resistance or friction acting on the system, therefore mechanical energy is conserved in all the four situations described.
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A wave with a high pitch and a quiet sound will have
Group of answer choices
a short wavelength and a low amplitude
a short wavelength and a high amplitude
a big wavelength and a high amplitude
a big wavelength and a low amplitude
Answer:
A)- SHORT WAVELENGTH AND LOW AMPLITUDE.
Explanation:
high pitch sound waves possess low wavelength and
quiet sound means that amplitue of the sound wave is low.
therefore option A matches the answer most.
Answer:
A)- SHORT WAVELENGTH AND LOW AMPLITUDE.
Explanation:
high pitch sound waves possess low wavelength and
quiet sound means that amplitue of the sound wave is low.
therefore option A matches the answer most.
Please help I don't know how to answer these questions!
discuss how energy conservation applies to a pendulum.
Where is the potential energy the most?
Where is the potential energy the least?
Where is kinetic energy the most?
Where is kinetic energy the least?
1) The potential energy is the most at the highest position and the least at the equilibrium position
2) The kinetic energy is the most at the equilibrium position and the least at the highest position
Explanation:
1)
The potential energy of an object is the energy possessed by the object due to its position in a gravitational field; mathematically, it is given by
[tex]PE=mgh[/tex]
where
m is the mass of the object
g is the strength of the gravitational field
h is the height of the object relative to the ground
For the pendulum in this problem, m is the mass of the bob, and h is the height of the above relative to the ground. We see from the formula that the potential energy is directly proportional to the height:
[tex]PE\propto h[/tex]
This means that:
The potential energy is the most when the bob is at the highest positionThe potential energy is the least when the bob is at the equilibrium position, which is the lowest position2)
We can solve this part by applying the law of conservation of energy: in fact, the total mechanical energy of the pendulum (sum of potential and kinetic energy) is constant at any time during the motion,
[tex]E=KE+PE=const.[/tex]
where KE is the kinetic energy.
From the equation above, we observe that:
When PE is maximum, KE must be at minimumWhen PE is minimum, KE must be maximumTherefore, this implies that:
The kinetic energy is the most when the potential energy is the least, i.e. at the equilibrium positionThe kinetic energy is the least when the potential energy is the most, i.e. at the highest positionLearn more about kinetic and potential energy:
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The Carbon-Oxygen cycle is regulated by three great reservoirs _____.
organisms
the atmosphere
the solar system
oceans
rocks.
multiple choice
The Carbon-Oxygen cycle is regulated by three great reservoirs "Organisms, Oceans and Rocks".
Answer: Option A, D and E
Explanation:
The steps of the carbon and oxygen cycle are:
In a process known as photosynthesis, plants consume carbon dioxide. The plants give off oxygen as a waste product during photosynthesis,thus respiration occur. The natural combustion processes are "volcanic eruptions" responsible for releasing carbon dioxide into the atmosphere due to burning, thus combustion occurs. After the death of unicellular or multicellular organism, finally decomposition take place.The atmosphere is the reservoir and regulated by the terrestrial biosphere freshwater bodies and non-living organic material like soil carbon, the sediments like fossil fuels and the oceans which involve dissolved inorganic carbon also living and non-living marine biota.
Answer:
a
d
e
Explanation:
Which forces affect a baseball's speed as it rises after being hit by a bat?
A. net force and drag
B. applied force and net force
C. gravity and drag
D. applied force and gravity
C) Gravity and drag
Explanation:
Here we are considering the ball after it has been hit by a bat.
When the ball is in the air, there are only two forces acting on it:
The weight of the ball (force of gravity), acting downward. Its magnitude is given by [tex]F_g = mg[/tex], where m is the mass of the ball and g is the acceleration of gravityThe air drag, which is the resistance of the air on the ball, acting downward as well (it acts against the direction of motion of the ball). The magnitude of this force is proportional to the speed of the ballThere is no applied force on the ball, since that one only acts on the ball when it is in contact with the bat - however, when the ball is in the air, the applied force no longer acts on the ball.
Therefore, the correct answer is
C. gravity and drag
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Answer:
C) Gravity and drag
Explanation:
Here we are considering the ball after it has been hit by a bat.
When the ball is in the air, there are only two forces acting on it:
The weight of the ball (force of gravity), acting downward. Its magnitude is given by , where m is the mass of the ball and g is the acceleration of gravity
The air drag, which is the resistance of the air on the ball, acting downward as well (it acts against the direction of motion of the ball). The magnitude of this force is proportional to the speed of the ball
There is no applied force on the ball, since that one only acts on the ball when it is in contact with the bat - however, when the ball is in the air, the applied force no longer acts on the ball.
Therefore, the correct answer is
C. gravity and drag
If the difference in electronegativity values between two atoms is more than 2.0, nonpolar covalent bonds generally form.
ITS FALSE
What is the mass of a baseball thrown at 25 m/s resulting in a momentum of 10 kg·m/s?
Answer: m = 0.4 kg
Explanation: Momentum is the product of mass and velocity also expressed in this equation:
p = m x v
Derive to find m
m = p / v
= 10 kg•m/s / 25 m/s
= 0.4 kg
The mass of baseball is 0.4 kg.
Given data:
The velocity of the baseball is, v = 25 m/s.
The resulting momentum of baseball is, p = 10 kg-m/s.
The momentum of any object is defined as the impact produced by the applied force. Hence it is expressed at the product of mass and velocity. The expression for the momentum is,
[tex]p = mv[/tex]
here, m is the mass of baseball.
Solving as,
[tex]10 = m \times 25\\\\m = 0.4 \;\rm kg[/tex]
Thus, we can conclude that the mass of baseball is 0.4 kg.
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Many organ system serve to help maintain a healthy body. The excretory system is an organ system which is composed of all sweat glands, the lungs, the rectum, and the kidneys, which all function to remove waste material. How does removing excess waste help the body to maintain overall health?
a removing excess waste helps the body increase its internal temperature.
b removing excess waste prevents people from growing to tall.
c removing excess waste prevents to body from recycling reusable material.
d removing excess waste helps prevent disease and support cell function
Answer: D
Explanation:
Cause removing excess waste from the body helps to maintain a steady health
Final answer:
The excretory system's role in removing excess waste is critical for preventing disease and supporting cell function by maintaining a balanced internal environment and removing harmful substances.
Explanation:
The excretory system plays a crucial role in maintaining the overall health of the body by ensuring the removal of excess waste and toxins. This system includes organs such as the kidneys, liver, skin, lungs, and large intestine. The kidneys filter blood, removing waste products and excess substances, forming urine which is then excreted from the body.
The skin eliminates waste through sweat, the liver metabolizes toxins and excretes bilirubin, the lungs expel carbon dioxide and water vapor, and the large intestine helps to remove solid waste. By doing all this, the excretory system helps prevent the accumulation of harmful substances which could lead to disease and supports the function of cells by maintaining a stable internal environment.
Removing excess waste helps to prevent disease by eliminating toxins that can damage tissues and cells. It also supports cell function by maintaining a balance of water, salts, and organic substances within the body. Therefore, the correct answer to the question is: d. Removing excess waste helps prevent disease and supports cell function.
The amount of gravity between 1kg of lead and Earth is ___ the amount of gravity between 1kg of marshmallows and Earth.
a. greater than
b. less than
c. the same as
d. none of the above
The amount of gravity between 1 kg of lead and Earth is the same as the amount of gravity between 1 kg of marshmallows and Earth.
Answer: Option C
Explanation:
According to universal law of gravity, the gravitational force is directly proportionate to the product of masses of the interacting objects and inversely proportionate to its distance squared between them.
Since the mass of Earth is very high compared to the mass of the other objects, be it lead or marshmallows, and the distance will be mostly same. Thus, there will be no change in the amount of gravity acting between them. Thus, the amount of gravity between 1 kg of lead and Earth is the same as the amount of gravity between 1 kg of marshmallows and Earth.
The amount of gravity between 1kg of lead and the Earth is the same as between 1kg of marshmallows and the Earth. The amount of gravity depends on the mass and distance, not on the material of the objects. This is based on Newton's law of universal gravitation.
Explanation:The amount of gravity that the Earth exerts on an object doesn't depend on the material of the object, but it does depend on the mass. Since both the 1kg of lead and the 1kg of marshmallows have the same mass, then the amount of gravity between them and the Earth is the same.
This principle is reflected in Newton's universal law of gravitation, expressed as F=G*(m1*m2)/r^2, where F is the force of gravity, m1 and m2 are the masses of the two objects, r is the distance between their centers, and G is the gravitational constant. Regardless of whether the object is made of lead or marshmallows, if the mass remains the same as 1kg, then the gravitational force, hence the gravity between the Earth and the object, will also be the same.
So, to answer your question, the amount of gravity between 1kg of lead and Earth is the same as the amount of gravity between 1kg of marshmallows and Earth.
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Sally and Conrad were arguing over the difference between a transverse wave and a longitudinal wave. Sally said that mechanical waves could be either transverse or longitudinal. Conrad said that sound waves were longitudinal and not transverse. Who is correct and why?
Group of answer choices
Neither are correct.
Only Conrad is correct because sound waves are not transverse waves.
Only Sally is correct because longitudinal waves and transverse waves are mechanical waves.
Both are correct since sound waves are mechanical waves.
Both are correct since sound waves are mechanical waves.
Option: D.
Explanation:
A wave is a recurring event that transfers energy through vibrations. It caused by the disturbance movement in a medium. The medium can be solid, liquid or gas and it can come in many forms and shapes.
If the particles in the medium moved in the perpendicular direction to the wave is called transverse wave and if those particles moved in the parallel direction to the wave then it is a longitudinal wave.
Mechanical waves require a medium to transfer that energy. Moreover, based on the medium properties ( inertial and elastic) it can be changed as either transverse or longitude.
In, sound wave the particles will move in the parallel direction to the wave. Also, it comes under mechanical wave since it requires an air medium to travel.
What factors affect water quality?
Answer:
Explained below:
Explanation:
Water quality is determined in terms of the physical, chemical and biological content of water. The quality of water of lakes and rivers variates with the seasons and also geographic areas, still in the absence of pollution. There are so many factors which affect water quality are as follows :
Pesticides
Temperature
Runoff
Sedimentation
Erosion
pH
Dissolved oxygen
Pesticides
Litter and rubbish
Decayed organic materials
Toxic and hazardous substances
Oils, grease, and other chemicals
A skydiver jumped out of a plane, determine distance he descended after 5 seconds. Gravity is pulling him down at 10 m/s^2 (air resistance is negligible).
Answer: 125 m
Explanation:
This problem is related to vertical motion and can be solved with the following equation:
[tex]y-y_{o}=V_{o}t-\frac{1}{2}gt^{2}[/tex] (1)
Where:
[tex]y-y_{o}=\Delta y[/tex] is the difference between the final height [tex]y[/tex] and initial height [tex]y_{o}[/tex]. Let's take into account the initial height is greater than the final height, since the skydiver is descending.
[tex]V_{o}=0 m/s[/tex] Is the skydiver's initial velocity, assuming the plane was not moving at that moment
[tex]t=5 s[/tex] is the time
[tex]g=10 m/s^{2}[/tex] is the acceleration due gravity
Solving the equation:
[tex]\Delta y=-\frac{1}{2}gt^{2}[/tex] (2)
[tex]\Delta y=-\frac{1}{2}(10 m/s^{2})(5 s)^{2}[/tex] (3)
[tex]\Delta y=-125 m[/tex] (4) Here, the negative sign only indicates the position of the skydiver, and remember the initial height is greater than the final height.
In fact, the distance is positive: 125 m
A remote control car is traveling at a velocity of 0.50 m/s when it hits a wall and comes to a stop in 0.050 seconds. What is the acceleration of the car?
Answer:0.50m/s divide by 0.050sec = 10m/s
Explanation: dividing the meter per second [m/s] by the second [s
Express 7.62 * 10 ^ (- 4) standard form
0.0062
72600
0.000762
76200
Answer:
76200
Explanation:
A new ride being built at an amusement park includes a vertical drop of 71.6 meters. Starting from rest the ride vertically drops that distance before the track curves forward. If the velocity at the bottom of the drop is 10.0 m/s and the mass of the cart and passengers is 3,5x10^4kg, how much potential energy was converted into thermal energy? 2.3x10^7, 2.6x10^7, 4.3x107, 6.7x10^7
Answer:
We can conclude 2.3x10^7 J was converted to thermal energy
Explanation:
Energy Conservation
According to the law of conservation of energy, the total energy of an isolated system must be constant. If some kind of energy is 'lost', we know it was transformed into another type.
Let's check the conditions of the problem. The ride vertically drops a distance of 71.6 m starting from rest, and at the bottom of the drop, its speed is 10 m/s. Knowing the mass of the cart plus passengers is 3.5X10^4 kg, we compute the total energy at the top of the drop.
[tex]E=U+K[/tex]
Where E is the total energy (which must be conserved) at the top of the drop, U is the gravitational potential energy and K is the kinetic energy. We use the equations for each:
[tex]U=m.g.h[/tex]
[tex]\displaystyle K=\frac{mv^2}{2}[/tex]
[tex]\displaystyle E=m.g.h+\frac{mv^2}{2}[/tex]
At the top, the speed is 0, thus
[tex]\displaystyle E=m.g.h=(35000)(9.8)(71.6)=2.5X10^7\ J[/tex]
Now we compute the 'total' energy at the bottom (quoted because we know there is some mechanical energy loss in the drop)
[tex]\displaystyle E'=m.g.h'+\frac{mv'^2}{2}[/tex]
This time h'=0 and v=10 m/s, thus
[tex]\displaystyle E'=\frac{(35000)10^2}{2}=1.8x10^6\ J[/tex]
The mechanical energy at the top and the bottom are not the same, thus we can know part of it was converted to heat or thermal energy. We compute the difference
[tex]2.5x10^7\ J-1.8x10^6\ J=2.3x10^7\ J[/tex]
We can conclude 2.3x10^7 J was converted to thermal energy
4. A ball has 17J of kinetic energy (KE) and its mechanical energy is 25J. What is the speed of the
ball? The ball has a mass of 3.2 kg.
Answer:3.25914099112
Explanation:
Do you have the formula? I pretty sure this is correct but I’m not sure
Speed of ball is 3.2 m/s (Approx.)
Given that;
Kinetic energy (KE) = 17 J
Mechanical energy = 25 J
Mass of ball = 3.2 kg
Find:
Speed of ball
Computation:
Kinetic energy (KE) = [1/2][mv²]
17 = [1/2][(3.2)v²]
17 = [1.6][v²]
v² = 17 / 1.6
v² = 10.625
v = √10.625
v = 3.2596
Speed of ball (v) = 3.2 m/s (Approx.)
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A ball is being thrown straight upward and rises to a maximum height of 12.0m above its launch point. At what height above it’s launch point has the speed of the ball decreased to one-half of its initial value
To determine the height at which the speed of the ball decreases to one-half of its initial value, we need to consider the vertical motion of the ball. By finding the time it takes for the ball to reach its maximum height and the time it takes for the speed to decrease on its way down, we can calculate the height above the launch point.
Explanation:The question is asking at what height above its launch point the speed of the ball decreases to one-half of its initial value. To determine this, we need to consider the vertical motion of the ball. Let's assume the launch point is at a height of 0 m.
Using the given information, we can find the time it takes for the ball to reach its maximum height using Equation 4.22. Then, we can calculate the time it takes for the speed of the ball to decrease to one-half of its initial value by finding the time it takes for the ball to reach the same height on its way down.
By considering the time it takes for the ball to reach its maximum height and the time it takes for the speed to decrease, we can determine the height above the launch point at which the speed is one-half of its initial value.
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Which optical instrument, a telescope, a microscope, or a camera, forms images in a way most like your eye? Explain.
Camera is an optical instrument that forms images in a way most like human eyes.
Explanation:
The eye consists of a small spherical globe of about 2 cm in diameter, which is free to rotate under the control of 6 extrinsic muscles. Light enters the eye through the transparent cornea, passes through the aqueous humor, the lens, and the vitreous humor, where it finally forms an image on the retina.
In case of a digital camera, CCD is used known as charged coupled device. CCD is actually in the shape of array or a rectangular grid. It is like a matrix with each cell in the matrix contains a censor that senses the intensity of photon. When light falls on the object , the light reflects back after striking the object and allowed to enter inside the camera which is then stored by CCD in the form of electric signals.
Similarities between eye and a camera:
Cornea and Lens - The cornea is the “cap” of the eye. This transparent (like clear jelly) structure sits to the front of the eye. The lens of a camera is also transparent (glass) and sits at the front of the body. Both allows light to enter and have spherical curvature.
Iris and aperture -The aperture is to the camera as the iris is to the eye. Both control the amount of light allowed to enter the eye or camera.
Retina and Film - The retina sits at the back of the eye and collects the light reflected from the surrounding environment to form the image. The same task in the camera is performed either by film or sensors in digital cameras.
Keywords: eye, camera, CCD, iris, film, aperture, cornea, lens, image formation
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A microscope forms images most similar to the eye due to the use of lenses and focusing techniques.
A microscope forms images in a way most like your eye. Both the eye and the microscope utilize lenses to form images. The method of focusing in the eye, through changes in the curvature of a lens, differs slightly from most optical instruments but is more similar to how a microscope forms images.
AS AIRPLANE WENT FROM 120 m/s to 180 m/s in 4.0 seconds what is the acceleration
Answer:15metre per second squ
I
Explanation:
acceleration=(final velocity-initial velocity)÷t
acceleration=(180-120)÷4
acceleration=60÷4
acceleration=15 metre per second square
Which two Bible verses state that Jesus Christ holds together everything in the universe by His power?
John 3:16
Colossians 1:17
Psalm 119:56
Hebrews 13
Answer:
Colossians 1:17
Explanation:
He is before all things, and in him all things hold together.
Answer:
John 3:16
Colossians 1:17
Explanation:
In a vacuum, two particles have charges of q1 and q2, where q1 = +4.2C. They are separated by a distance of 0.31 m, and particle 1 experiences an attractive force of 4.5 N. What is the value of q2, with its sign?
Answer:
11.44pC.
Explanation:
F = kq1q2/r^2
q2 = Fr^2/kq1
= 4.5 x 0.31^2/4.2x 9 x 10^9
= 1.144 x 10^-11C
= 11.44pC
The sign is minus since they attracted to each other
What event happens about once every month? A. a revolution of the Earth around the Sun B. a rotation of the Earth C. a full Moon D. a lunar eclipse
Answer:
C. A full moon.
Explanation:
A is a year.
B is a day.
D I'm not sure how often a lunar eclipse occurs, but definitely the every month!
Among the given options, the phenomenon which occurs once in every month is full moon. Rotation of earth is taking place every day and revolution of earth around sun is completing within one year.
What is full moon ?The lunar phase during which the moon is completely lit from Earth's viewpoint is known as the full moon. When earth is situated halfway between the sun and the moon, this happens.
This indicates that the lunar hemisphere facing earth's near side is fully illuminated by the sun and appears as a roughly spherical disc. On average, there is a full moon once each month.
A synodic month, or the duration between a full moon and the subsequent occurrence of the same phase, lasts on average around 29.53 days.
Therefore, the full moon occurs on either the 14th or 15th day of the lunar month in those lunar calendars where each month starts on the day of the new moon.
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How much time is required for a bicycle to travel a distance of 100 m at an average speed of 2 mi./s
The time required for a bicycle to travel the distance of 100 m is 50 s.
Explanation:
We know that speed is the measure of how fast an object can move to cover a given distance in given time. So it is measured as the ratio of distance per unit time.
[tex]Speed =\frac{\text { Distance }}{\text { Time }}[/tex]
As it is scalar quantity, direction does not play any role in it.
So time taken for covering the distance of 100 m with speed of 2 m/s can be determined as
[tex]Time =\frac{\text { Distance }}{\text { Speed }}=\frac{100}{2}=50 seconds[/tex]
Thus, 50 s will be required by the bicycle to cover 100 m distance.
What does the electron do in an atom?
Answer:
Electrons are the negatively charged particles of an atom.Together,all of the electrons of a atom create a negitive charge that balances the positive charge of the protons
Explanation: