Kilowatt hours are a unit of measurement for the energy required to heat a house. It is the amount of energy used every hour. Hence option B.
Power is a tangible measure of how much work or energy is expended in a certain amount of time. Therefore, power is the rate at which an object expends energy or performs work. Watt is the definition of power. The joule is a unit of both work and energy.
Kilowatts are the unit of measurement for power for higher energy usage. Power input and time are the components of work or energy.
W in J hence equals power in Watt/time in hours.
Kilowatts hours are the unit used to measure domestic energy use. Hence, option B is our answer.
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rosie lifts a trunk weighing 480 n up 1.2 m. if it takes her 13 s to lift the trunk, at what average rate does she do work?
The force is the weight of the log, 480 N, and the distance is the height at which the log is lifted, she is 1.2 m. So here's what Rosie did Work = 576 J and her average workload is about 44.3 watts.
What is Work?Work is an activity that is done in exchange for b or other rewards. It can involve physical or mental effort and is usually of a practical nature. It may be paid or unpaid and can be done in a variety of settings and contexts, such as businesses, factories, farms, homes, schools, and hospitals. Work is important to society as it allows people to contribute to economic growth, build their skills, and gain a sense of identity and purpose. to calculate the average rate of work
The work a Rosie does is equal to the force it applies to the stem multiplied by the distance it lifts.
work = force x distance
The force is the weight of the log, 480 N, and the distance is the height at which the log is lifted, she is 1.2 m. So here's what Rosie did:
Work = (480 N) x (1.2 m) = 576 J
The time it takes Rosie to lift the trunk is her 13 seconds, so her average amount of work is:
Average power = work ÷ time
Average power = 576 J / 13 sec ≈ 44.3 W
So Rosie's average workload is about 44.3 watts.
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The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against the gravitational force by a vertical electric fielda. Given that the oil drop is 0.95 μm in radius and has a density of 905 kg/m3, find the weight of the drop in N.b. If the drop has a single excess electron, find the electric field strength needed to balance its weight.
After solving, a) The weight of it oil drop is 2.42 x 10⁻¹² N, b) the electric field strength needed to balance its weight is -1.51 x 10⁷ N/C
The weight of the oil drop can be calculated using the formula:
weight = mass x gravity
where mass = density x volume and gravity = 9.81 m/s².
The volume of the oil drop can be calculated using the formula for the volume of a sphere:
volume = (4/3) x pi x radius³
Substituting the given values:
volume = (4/3) x pi x (0.95 x 10⁻⁶ m)³ = 2.73 x 10⁻¹⁶ m³
mass = density x volume = 905 kg/m³ x 2.73 x 10⁻¹⁶ m³ = 2.47 x 10⁻¹³ kg
weight = mass x gravity = 2.47 x 10⁻¹³ kg x 9.81 m/s² = 2.42 x 10⁻¹² N
To balance the weight of the oil drop, the electric force on the excess electron must be equal and opposite to the weight of the drop. The electric force on the excess electron can be calculated using the formula:
electric force = charge x electric field
where charge is the charge on the excess electron and electric field is the strength of the electric field.
The charge on an electron is -1.602 x 10⁻¹⁹ C.
Substituting the given values and equating the electric force to the weight of the drop:
charge x electric field = weight
-1.602 x 10⁻¹⁹ C x electric field = 2.42 x 10⁻¹² N
Solving for electric field:
electric field = (2.42 x 10⁻¹² N) / (-1.602 x 10⁻¹⁹ C) = -1.51 x 10⁷ N/C
The negative sign indicates that the electric field is directed upward, opposite to the direction of gravity, in order to balance the weight of the drop.
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what is t value table
The t value table is a statistical reference table that is used to find critical values for the t-distribution.
The t distribution is a probability distribution that is used in statistical hypothesis testing, particularly when the sample size is small or the population standard deviation is unknown.
The t value table contains a list of t-values for different degrees of freedom and levels of significance. Degrees of freedom represent the number of independent observations in a sample, and the level of significance represents the probability of rejecting a null hypothesis when it is actually true.
The t-value table is used to find the critical value of t for a given level of significance and degrees of freedom. This value is then compared to the calculated value of t from the sample data to determine whether to accept or reject the null hypothesis.
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how does the length of the cord/strings affect the descent of the parachute?
The hang time of the parachute increased with string length, increasing air resistance. Even while gravity was always pushing on the object, the shorter strings increased the force it was exerting.
Gravity and drag are the main forces affecting a parachute. When you initially open the parachute, gravity pulls it downward and causes it to fall quickly to the ground. Yet, the amount of drag increases with falling speed.
The more air that needs to be forced out of the way by a parachute's bigger surface area, the slower it descends.
Air resistance rises with string length, prolonging the hang time and affecting the descent of the parachute. The shorter ropes increased the force that gravity was imposing on the object even though gravity was always pulling on it.
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Pls help with this question it is giving me headache
Answer:
Explanation:no se wey
Choose the correct term to complete the sentence. the doppler effect is the change in of a wave due to the motion of the source and/or receiver.
The Doppler effect is the change in frequency of a wave due to the motion of the source and/or receiver.
The shift in wave frequency that happens when a wave source and its observer move in relation to one another is known as the "Doppler Effect."
The number of waves that pass a fixed place in a unit of time is referred to as frequency in physics. It also indicates how many vibrations or cycles a body during periodic motion makes in a given amount of time.
When a source or receiver moves, a wave's frequency changes, and this is known as the Doppler effect.
The correct term to complete the sentence is "frequency".
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Question - Complete the sentence.
The Doppler effect is the change in__________ of a wave due to the motion of the source and/or receiver.
Answer:
frequency
Explanation:
That is the answer
how to convert 200c to fahrenheit?
A man threw a 0.05 kg baseball towards a receiver with a speed of 15 m/s, the receiver catches the ball making it at rest. The force of impact was measured to be 30 N. What time taken to make the ball fully stops?
A) 0.025 s
B) 0.25 s
C)2.5 s
The time of impact taken to make the ball fully stops is A. 0.025 s
What is time?Time is the duration of an event
How to find the time taken to make the ball fully stops?Since a man threw a 0.05 kg baseball towards a receiver with a speed of 15 m/s, the receiver catches the ball making it at rest. The force of impact was measured to be 30 N. To find the time taken to make the ball stop, we use Newtons's third law of motion. which states that The force acting on an object equals the rate of change of momentum. The change in momentum is the impulse
F = Δp/Δt where
F = force ,Δp = change in momentum and Δt = timeMaking Δt the time of impact subject of the formula, we have
Δt = Δp/F
Now Δp = m(v - u) where
m = mass of ball u = initial velocity of ball and u = final velocity of ballSo, Δt = Δp/F
Δt = m(v - u)/F
Since
m = 0.05 kgu = 15m/s v = 0 m/s (since the ball stops) and F = 30 NSubstituting the values of the variables into the equation, we have that
Δt = m(v - u)/F
Δt = 0.05 kg(0 m/s - 15 m/s)/30 N
Δt = 0.05 kg(-15 m/s)/30 N
Δt = -0.75 kgm/s/30 N
Δt = -0.025 s
So, the time is A. 0.025 s
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A musical note has a frequency of 212 Hz. If the wavelength of the note is. 425 m, what is the speed of the sound of that note
If a musical note has a frequency of 212 Hz and a wavelength of 425 m, its velocity is 90.1 m/s.
The speed of sound is a relationship between frequency and wavelength, mathematically represented as follows:
speed = frequency x wavelength
In this case, the frequency is 212 Hz and the wavelength is 0.425 m. Plugging these values into the equation gives:
speed = frequency x wavelength
speed = 212 Hz x 0.425 m
speed = 90.1 m/s
Therefore, we can affirm that the the speed of the sound of the musical note is 90.1 m/s.
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A sled is pulled with a rope that has a tension of 100.0 N. Find the power required to pull the sled a distance of 1.00 km in 20.0 min.
The amount of power needed to draw the sled 1.00 km in 20.0 minutes at a tension of 100.0 N is roughly 83.3 watts.
What is energy with labor power?Energy is referred to as the ability to perform the work, whereas work is defined as the displacement of an object when a force (push or pull) is applied to it. It can be found in a variety of forms, including potential, kinetic, chemical, thermal, nuclear, electrical, and so forth.
We can apply the power equation:
Power is defined as the product of work, the quantity of energy needed to move the sled, and time, the length of the sled's motion.
Finding the work completed on the For work, we can apply the following formula:
work = force x distance
distance = 1.00 km x 1000 m/km = 1000 m
time = 20.0 min x 60 s/min = 1200 s
work = force x distance = 100.0 N x 1000 m = 100000 J
Finally, we can calculate the power required to move the sled:
power = work / time = 100000 J / 1200 s = 83.3 W.
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When preparing a wet mount specimen for viewing, it should be covered with ______. A) clear paper. B) another glass slide. C) a coverslip
When preparing a wet mount specimen for viewing, it should be covered with a coverslip.
A coverslip is a thin, flat piece of glass or plastic that is placed over the specimen on the slide. It is used to protect the specimen from being compressed or damaged, and to prevent evaporation of the liquid medium that the specimen is suspended in. The coverslip also helps to keep the specimen in focus and allows the viewer to observe the specimen clearly under a microscope.
To prepare a wet mount, a small amount of the specimen is placed on a microscope slide and a drop of liquid medium (such as water, saline, or stain) is added. The coverslip is then placed over the specimen at a slight angle and carefully lowered onto the slide to avoid trapping air bubbles. The coverslip should be pressed down gently to flatten the specimen and remove any excess liquid, but not so hard as to crush the specimen.
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what instrument is used to measure relative humidity?
A device called a hygrometer is used to measure relative humidity.
Hygrometers come in various types, but the most common ones are the psychrometer and the electronic hygrometer. They measure relative humidity.
A psychrometer consists of two thermometers, one dry and the other wet, that are attached to a handle. The wet thermometer has a cotton wick wrapped around its bulb, which is soaked in distilled water. The dry thermometer measures the ambient air temperature, while the wet thermometer measures the air temperature as affected by the evaporation of the water from the wick. The difference between two readings calculates relative humidity.
Electronic hygrometers use a sensor to measure the dew point temperature, which is the temperature at which the air becomes saturated and condensation occurs. The sensor then calculates the relative humidity based on the difference between the dew point temperature and the ambient air temperature.
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What is 35.6 degrees Celsius in Fahrenheit?
In Fahrenheit, 35.6 degrees Celsius is equivalent to 128.08 degrees.
Use the formula below for the convert 35.6 degrees Celsius to Fahrenheit:
°F = (°C x 1.8) + 32
The process of translating a temperature from one scale to another is referred to as temperature conversion. Temperature conversions between the several regularly used temperature scales, including Celsius, Fahrenheit, and Kelvin, are frequently required.
where the temperature is expressed in degrees Fahrenheit (°F) and degrees Celsius (°C).
Plugging in 35.6 degrees Celsius yields the following results:
°F = (35.6 x 1.8) + 32 °F
=> 96.08 + 32 °F
=> 128.08
As a result, 35.6 Celsius is equivalent to 128.08 Fahrenheit.
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what is definition of precision?
Precision is the ability of the instrument to measure the reading specifically in a closed interval.
When we perform experiments in physics we often come across the term precision.
The term Precision describes the ability of an instrument used in the experiment to measure the value without any variation.
We can understand this by an example, if there is an electronic scale that measures a length of thread to be 2 cm. Now again when we measure the length of thread it measures 2.1 cm and again when we do the same it measures 1.9cm.
So, as we can see that the electronic scale is measuring the values and the value is not wearing very much so we can say that the instrument has a high precision.
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if the electric potential at some point is large, is the electric field at that point also necessarily large or not?
As a result, when the electric potential at a place is high, a big electric field is not necessary.
What is meant by electric potential?Electric potential is the effort required to transport a single charge from one location to another in the presence of an electric field. Earth is typically chosen as the reference point, however any location beyond the range of the electric field charge can be used.
What is the definition of electric potential in the SI system?We all know that the electric potential between two locations is represented by the letter (V), which is also called as voltage. Moreover, it can be described in terms of joule per coulomb or electrostatic force (E.M.F). Volt is the SI unit for electric potential.
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Gravitational attraction is the driving force for which processes? Stellar fusion Formation of Moons Expansion of the Universe Formation of stars Formation of planets Formation of nebulae
Gravitational attraction is the driving force for stellar fusion. So option a. is the correct answer.
Massive clouds were created when gas whirls of both helium and hydrogen cooled. The stuff was attracted together by the gravitational attraction in the middle, and ultimately, a few of the nuclei formed. The heat as well as the light of stars were elicited as a consequence of this. Stellar nucleosynthesis is the method by which elements are produced within stars by integrating the protons and neutrons together from the nuclei of lighter elements. All of the atoms in the universe started as hydrogen. Fusion inside stars transforms hydrogen into helium, heat, and radiation. Heavier elements are produced in distinct kinds of stars as they die or explode.
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An electric heater has two power settings .One Setting is 0.5kW and the other is 1.5kW One Kwh Of Electricity Cost 11 Pence . Calculate how much you would save if you used the heater 12 hours on the 0.5 setting Instead of the 1.5kW Setting.
I really need help on this
answer
is 1 kw is the answer
what does the second law of thermodynamics state about energy?
The second law of thermodynamics is a fundamental principle in physics that relates to the direction of energy transfer in a system. In general, the second law states that the total entropy of a closed system cannot decrease over time.
What is energy?Energy is a fundamental concept in physics that refers to the ability of a system to do work.
In simpler terms, the second law of thermodynamics implies that energy spontaneously flows from regions of higher concentration to regions of lower concentration and that this flow will result in an overall increase in the system's entropy or disorder. This is often described as the "arrow of time," as it explains why time seems to only move forward, and not backward.
The second law also implies that energy cannot be completely converted from one form to another without some energy being lost to the environment, due to the fact that some energy is always converted to heat and dispersed into the surroundings. This is known as the law of energy conservation or the principle of energy degradation.
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What has a definite volume definite shape and are rigid?
Answer:
Explanation:
Answer is solids
Solids have definite shape and volume.
Liquids do not have shape but have volume. The take the shape of the container.
Gases do not have shape nor volume.
What is the conversion of 99.6 f to c ?
99.6°F is equivalent to 37.6°C.
A temperature unit developed from the SI (International System of Units) is Celsius (symbol: °C).
Prior to the adoption of the metric system, Fahrenheit (symbol: °F) was a commonly used measurement of temperature.
To convert Fahrenheit (°F) to Celsius (°C) we have to first subtract 32 from Fahrenheit and then multiply it by .5556 or 5/9.
We have to convert 99.3 degrees Fahrenheit (°F) to Celsius (°C),
We can use the following formula:
°C = (°F - 32) x 5/9
As per the given information,
°F = 99.6
Substituting the value 99.3 for °F, we get:
°C = (99.6 - 32) x 5/9
= 67.6 x 5/9
= 37.6
Therefore, 99.6°F is equivalent to 37.6°C.
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How to convert 98.9 f to c?
98.9°F is equivalent to 37.17°C temperature. Using Formula: °C = (°F - 32) x 5/9
To convert 98.9°F to Celsius (°C), you can use the following formula:
°C = (°F - 32) x 5/9
Substituting 98.9 for °F in the formula, we get:
°C = (98.9 - 32) x 5/9 = 37.17
Therefore, 98.9°F is equivalent to 37.17°C.
It's important to note that when converting Fahrenheit to Celsius, the resulting Celsius temperature is often more precise with decimal places. In this case, the Celsius temperature is 37.17°C, which means that the temperature is between 37°C and 38°C.
To double-check your conversion, you can also use online temperature conversion tools or smartphone apps that are readily available and accurate.
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Why is metallic chain hanging at the rear side of a gasoline truck?
A metallic chain is hanging at the rear side of a gasoline truck to prevent the build-up of static electricity.
When a gasoline truck is in motion, the friction between the air and the truck can generate static electricity. This static electricity can be dangerous because it can cause a spark, which could ignite the gasoline and cause a fire or explosion.
The metallic chain hanging at the rear side of the truck is designed to ground the truck and dissipate the static electricity, preventing the build-up of a dangerous charge. This is an important safety measure that helps to prevent accidents and protect both the truck and its cargo.
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best describes the energy of particles in a gas? 1
The kinetic energy of the particle of the gas best describes about the energy in a gas.
The energy possessed by a body by the virtue of its motion is called the kinetic energy of a body.
We know that the particles of the gas are in a continuous random motion and because these particles are in motion they will possess some kinetic energy and it is a very convenient things for us to calculate the kinetic energy of the body to have a rough idea about the energy that is present in the gas or we can say the particle of the gas.
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A hot metal sphere is dropped into a beaker of cold liquid inside an insulated container. The metal and the liquid quickly reach a common final temperature. Let the metal and the beaker of liquid be the system.
a. In this process, does the energy of the system increase, decrease, or stay the same?
- The energy increases.
-The energy decreases.
-The energy stays the same.
b. In this process, does the entropy of the system increase, decrease, or stay the same? -The entropy increases. -The entropy decreases. -The entropy stays the same.
In a) Energy will stay the same as no transfer or energy while in b) Entropy will increase due to increase in disorder from hot to cold object.
The full solution and explanation:
a. In this process, the energy of the system stays the same according to the Law of Conservation of Energy. The energy that is lost by the hot metal sphere is gained by the cold liquid in the beaker, and no energy is gained or lost by the system as a whole. However, during the process, heat flows from the hot metal sphere to the cold liquid, so there is a transfer of energy.
b. In this process, the entropy of the system increases. Entropy is a measure of the disorder or randomness of a system, and during this process, the heat flows from a hot object to a colder object, which increases the disorder of the system. As a result, the entropy of the system increases, which is consistent with the Second Law of Thermodynamics.
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what is mars bigger than earth?
Mars is actually smaller than Earth.
Mars is the fourth planet from the sun in our solar system and is often referred to as the "Red Planet" due to its distinctive rusty color.
Mars has a diameter of approximately 6,779 km, which is about 53% of the diameter of Earth, which has a diameter of approximately 12,742 km. Mars also has only about 11% of the mass of Earth.
Although Mars is smaller than Earth, it is still one of the largest planets in our solar system, with a surface area of approximately 144 million square kilometers, which is about 28% of the total surface area of Earth.
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how to convert 40celsius to fahrenheit?
40 degree Celsius in Fahrenheit is 104F. Fahrenheit and Celsius are related in that they are both units of temperature measurement.
To convert Celsius to Fahrenheit, you need to use the formula:
[tex]F = (9/5) * C + 32[/tex]
In this case, the formula would be:
[tex]Fahrenheit = (9/5) * 40 + 32[/tex]
Fahrenheit = 72 + 32
Fahrenheit = 104°F
Therefore, 40°C is equal to 104°F.
The formula for converting a temperature from Fahrenheit to Celsius is [tex](F - 32) * 5/9[/tex]. This formula can be used to find the Celsius equivalent of any temperature given in Fahrenheit. Celsius, also known as centigrade, was developed by Swedish astronomer Anders Celsius in the mid 1700s. It is a scale based on 0 degrees as the freezing point of water and 100 degrees as the boiling point of water.
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What are the 3 formulas in Ohm's law?
Ohm's law has three formulas, which are V = IR, I = V/R, and R = V/I.
Ohm's law describes the relationship between voltage, current, and resistance in an electrical circuit. The first formula, V = IR, states that the voltage across a resistor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance of the resistor.
The second formula, I = V/R, expresses the current flowing through a resistor in terms of the voltage across it and the resistance of the resistor. Finally, the third formula, R = V/I, gives the resistance of a resistor in terms of the voltage across it and the current flowing through it. These formulas are commonly used in analyzing and designing electrical circuits.
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You are a member of an alpine rescue team and must get a box of supplies, with mass 2.50 kg, up an incline of constant slope angle 30.0° so that it reaches a stranded skier who is a vertical distance 3.50 m above the bottom of the incline. There is some friction present; the kinetic coefficient of friction is 6.00x10^-2. Since you can't walk up the incline, you give the box a push that gives it an initial velocity; then the box slides up the incline, slowing down under the forces of friction and gravity. Take acceleration due to gravity to be 9.81 m/s^2Hint 1. How to approach the problem Hint 2. Find the total work done on the box Hint 3. Initial kinetic energy Hint 4. What is the final kinetic energy?
Answer:
Wtotal = KEfinal - KEinitial
42.81 J + 1.47 N * u^2 * 1.70 m/kg
Explanation:
To solve this problem, we can use the work-energy principle, which states that the net work done on an object is equal to its change in kinetic energy. We can break the problem down into several steps to determine the total work done on the box and its final kinetic energy.
Step 1: Find the work done by gravity
The gravitational force acting on the box as it moves up the incline is given by Fg = mgsin(theta), where m is the mass of the box, g is the acceleration due to gravity, and theta is the angle of the incline. The work done by gravity over a vertical distance h is given by Wg = Fg*h. Plugging in the values given in the problem, we get:
Fg = 2.50 kg * 9.81 m/s^2 * sin(30.0°) = 12.23 N
Wg = Fg * 3.50 m = 42.81 J
Step 2: Find the work done by friction
The frictional force acting on the box is given by Ff = mgcos(theta)mu, where mu is the kinetic coefficient of friction. The work done by friction over a horizontal distance s is given by Wf = Ffs. Since the box starts from rest and comes to a stop, the work done by friction must be equal to the initial kinetic energy of the box. Plugging in the values given in the problem, we get:
Ff = 2.50 kg * 9.81 m/s^2 * cos(30.0°) * 6.00x10^-2 = 1.47 N
Wf = Ff * s
To find the distance s, we can use the fact that the box comes to a stop at the highest point of its trajectory, where its final velocity is zero. Using the equations of motion, we can find the distance s:
v^2 - u^2 = 2as
where v is the final velocity (0 m/s), u is the initial velocity, a is the acceleration (given by Ff/m), and s is the distance traveled.
Plugging in the values given in the problem, we get:
0 - u^2 = 2 * (1.47 N) / 2.50 kg * s
s = u^2 / (2 * (1.47 N) / 2.50 kg) = u^2 * 1.70 m/kg
Step 3: Find the total work done on the box
The total work done on the box is the sum of the work done by gravity and the work done by friction:
Wtotal = Wg + Wf = 42.81 J + Ff * s
Plugging in the values of Ff and s, we get:
Wtotal = 42.81 J + 1.47 N * u^2 * 1.70 m/kg
Step 4: Find the initial kinetic energy and final kinetic energy
The initial kinetic energy of the box is given by KE = 1/2 * m * u^2, where m is the mass of the box and u is the initial velocity. The final kinetic energy of the box is zero, since it comes to a stop at the highest point of its trajectory.
Therefore, the initial kinetic energy is:
KE = 1/2 * 2.50 kg * u^2
And the final kinetic energy is:
KE = 0 J
Putting it all together, we get:
Wtotal = KEfinal - KEinitial
42.81 J + 1.47 N * u^2 * 1.70 m/kg
Which change will occur in a system with increasing entropy? A Thermal energy will increase B. Mechanical energy will increase C Elastic potential energy will decrease D Gravitational potential energy will decrease
Option A Thermal energy will increase is a change that will occur in a system with increasing entropy.
Why does thermal energy increase in a system with increasing entropy?Thermal energy increases in a system with increasing entropy because this energy is a measure f the movement of the particles which is directly associated with the chaotic state of the matter and therefore also with entropy, a measurement of the chaos in the universe.
Therefore, with this data, we can see that thermal energy increases in a system with increasing entropy due to chaos.
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Which planet would show the least variation in its distance from the sun?
O A. One with a large mass
OB. One with a small mass
C. One with a highly elliptical orbit
OD. One with a nearly circular orbit
Kepler's laws demonstrate how gravity affects orbits. They pertain to any orbiting object, such as planets around the Sun and moons.
The Sun is what?Our planet is subject to incredibly significant impacts from the sun: By photosynthesis, it supports seasons, climate, ocean currents, weather, and plant life. Life on Earth just wouldn't live without the heat and light provided by the sun. The solar system's centre is where the sun is located. The sun is a sizable ball of hot gases that spins and glows.
A gas is what?A liquid will expand in order to fill a closed container while inside of it. The air you inhale is an example of a gas. When applied to matter, the word "gas" can also refer to the state.
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