According to the National Electric Code (NEC) section 426.20(A), an embedded deicing unit of the resistance type shall not exceed 120 watts/ft2 of the heated area.
This limits the amount of power that an embedded deicing unit of the resistance type can use to melt snow and ice on a surface. This ensures that the unit does not overheat or create a fire hazard.
It's important to note that this limit applies to the total power used by the embedded deicing unit and not just the heating element. Other factors like the type of material, the environment, and the design can also affect the performance and safety of the deicing unit.
It's recommended to consult with local code officials or a licensed professional to determine the specific requirements and limitations that apply to your project.
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A soccer player is running with a velocity of +3 m/s when he sees an opponent chasing him. At this time, he begins accelerating at 2 m/s^2. What will be his velocity after 4 seconds?
According to the given data in the question his velocity after 4 sec. will be 20 m/s.
what is mean by velocity?Velocity is a vector expression of the displacement that an object or particle undergoes with respect to time .The standard unit of velocity magnitude (also known as speed ) is the meter per second (m/s). Alternatively, the centimeter per second (cm/s) can be used to express velocity magnitude.
We can find the acceleration by using the formula to find the final velocity in terms of initial velocity and acceleration and then solving for a. The formula is V2 = V1 + (a)(t) where V2 is final velocity, V1 is initial velocity and t is time in seconds.
We are going to substitute the values given in the problem:
V1= 3 m/s
a= 2 m/s
t = 4 seconds
VELOCITY=V=V1+(a) (t)
V=3+2*4
V=20 m/s
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When you throw a ball upward, its kinetic energy decreases (...)decreases (....increases (...)remains the same and its potential energy invreases (...)decreases (....increases (...)remains the same . When the ball reaches maximum height, its kinetic energy is at a maximum (...)maximum (...)minimum.
Answer:
when the ball is thrown upward kinetic energy will keep on decreasing and its potential energy will increase. when the ball reach maximum height, its kinetic energy is at the minimum
Explanation:
hopes it helps =D
a 1-kw toaster takes roughly 3 minutes to heat four slices of bread. find the cost of operating the toaster twice per day for 2 weeks (14 days). assume energy costs 9 cents/kwh.
It will cost 252 cents for 14 days twice a day roasting for 3 minutes every time.
As we have a toaster which takes 1kw per 3 minutes
and the total time taken will be = 14 *2*3 minutes (14 days, Twice a day, and 3 minutes every time) which makes 84 minutes of working. For the same, the cost which needs to give = is 9 cents/kWh. So Total energy consumption = 84/3 as it takes 3 minutes for consuming 1 kW of energy.
So total energy = 28 Kwhrate = 9 cents/kWhso the total expensive will be 9x28 = 252 cents. So It will cost 252 cents in 2 weeks (14 days)
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how does the greenhouse effect related to heat transfer
A warmer Earth is caused by more greenhouse gases. More greenhouse gases trap the heat in the atmosphere, warming it.
How do greenhouse gases function?Carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and ozone are the principal greenhouse gases and their concentration is increasing on a large scale.
Some light cannot leave the Earth due to the absorption of light by greenhouse gas molecules in the atmosphere. The atmosphere becomes warmer as a result, increasing the planet's average temperature. The heat is absorbed by the extra greenhouse gases. The heat is then radiated by them. One greenhouse gas molecule will absorb some of the heat, while other molecules will finish up being absorbed by other molecules. as more greenhouse gases stay in atmosphere, they warm the earth.
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It is a force that acts in a direction opposite to the motion of the moving object
The force that acts in a direction opposite to the motion of the moving object is called drag or air resistance.
Drag or air resistance is a force that acts on a moving object in a fluid medium, such as air or water, opposing its motion. It acts in a direction opposite to the motion of the object and is caused by the friction and pressure differences between the fluid and the object's surface. Drag force increases with the velocity of the object and its surface area, and it's usually modeled as a quadratic function of the velocity. For example, when a car is moving, the air resistance acts in the opposite direction of the car's motion, slowing it down. The drag force is not the only force that acts on the object, but it's one of the most significant forces acting on it, especially for objects moving at high speeds.
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1. As part of an experiment, what did Naveena Shine limit her diet to? A. water, fruit, and tea B. sunlight, sugar, and water C. sunlight, water, and tea D. sunlight, water, and fruit
As part of an experiment, Naveena Shine limits her diet to sunlight, water, and tea. The correct option is C.
What was Naveena's experiment?Naveena's experiment was to produce food by her own body, as the autotrophs do. But her experiments failed very badly. She controlled her diet for six months. She lost weight and she couldn't stand properly.
Shine probably wouldn't have thought her experiment would be successful if she had a better understanding of photosynthesis and how the human body functions.
Therefore, the correct option is C. sunlight, water, and tea.
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The question is incomplete. Your most probably complete question is given below:
In 2013, a resident of Seattle, Washington, named Naveena Shine decided that she would embark on an experiment. Shine had become fascinated with photosynthesis, the process by which plants are able to make their own food using sunlight. Sunlight contains a significant amount of energy, which plants are able to use to convert water, carbon dioxide, and minerals into oxygen and organic compounds, including nutrients like glucose. Shine reasoned that the human body, if forced to, could do the same thing. So Shine set out to test her hypothesis. In May, she declared that, for the next six months, she would not eat food. Instead, she would limit her diet to only sunlight, water, and tea.
which food has the lowest energy density? fried green tomatoes sun-dried tomatoes jarred tomato pasta sauce with garlic and olive oil sliced fresh tomatoes with basil and balsamic vinegar
Option D i.e. sliced fresh tomatoes with basil and balsamic vinegar has the lowest energy density among the given choices.
What is Density?The mass of a substance per unit of volume is termed as its density. Density is most frequently represented by the symbol, however Latin letter D may also be used sometimes. Mass divided by volume is the definition of density in mathematics: where is the density, m is the mass, and V is the volume.
The units of mass divided by volume used to measure density include grammes per centimetre cube (g/cm3) and kilogrammes per litre (kg/l).
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which has higher kinetic energy: a sled resting at the top of a hill or a sled sliding down the hill?
A sled sliding down the hill will have the higher kinetic energy due to its motion as kinetic energy is possessed by an object having motion.
What do you mean by Kinetic energy?The energy which an object has as a result of motion is termed as kinetic energy. Kinetic energy is determined as the effort required to move a mass-determined body from rest to the indicated velocity or in motion in simple words. Until its speed changes, the body maintains the kinetic energy it gained during its acceleration.
The formula for kinetic energy is as follows: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity. The kinetic energy is measured in kgm^2s if the mass is measured in kilograms and the velocity is measured in meters per second.
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Why is kinetic energy at its lowest at the top of the swing?
The work-energy theorem and the law of conservation of energy are well known. Potential energy in an item starts to increase as it rises. To maintain the total of the two energies constant, kinetic energy begins to decline.
Kinetic energy, which may be seen in the movement of an item or subatomic particle, is the energy of motion. Kinetic energy is present in every particle and moving object. Examples of kinetic energy in action include a person walking, a baseball flying through the air, a piece of food falling from a table, and a charged particle in an electric field. Kinetic energy has the following formula: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity. The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.
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A 60-kilogram student jumps down from a laboratory counter. At the instant he lands on the floor, his speed is 3 meters per second. If the student stops in 0. 2 seconds, what is the average force on the student?.
The average force on that student is 900N. It is determine by Newton's second law of motion.
How to find the average force on that student?Because the student start from static condition, we can determine it as the student initial velocity (v) = 0 m/s. based on Newton's second law of motion, the resultant force acting on the body and is in the same direction is the same as the rate of change of momentum of a body that is written as formula as follow:
F = ΔP : t
F = [tex]\frac{m(v-u)}{t}[/tex]
As per data given, speed (u) = 3m/s, mass (m) = 60 Kg, and student stop (t) = 0.2 s. The calculation of the average force will be:
F = [tex]\frac{m(v-u)}{t}[/tex]
F = [tex]\frac{60( 3 - 0)}{0.20}[/tex]
F = 900 N
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a fishing bobber oscillates in simple harmonic motion because of the waves in a lake. the bobber moves a total of inches from its low point to its high point and returns to its high point every seconds. write an equation that describes the motion of the bobber, where the high point corresponds to the time .
Equation that describes the motion of bobber, where the high point corresponds to the time t y = 1.5 sin(2πt/3).
The motion of the bobber can be described by a sinusoidal function, with the high point corresponding to the time t.
The amplitude of the oscillations is 1.5 inches, and the period of the oscillations is 3 seconds.
Therefore, the equation that describes the motion of the bobber can be written as: y = 1.5 sin(2πt/3)In this equation,
y represents the displacement of the bobber from its equilibrium position, and t represents time.
The displacement is measured in inches and the time is measured in seconds.
This equation describes the bobber's motion as it oscillates back and forth in simple harmonic motion, with the high point corresponding to the time t.
The bobber reaches its maximum displacement of 1.5 inches from its equilibrium position at t = 0, 3, 6, etc. and reaches its minimum displacement at t = 1.5, 4.5, 7.5, etc.
The bobber returns to its high point at t = 3, 6, 9, etc.
Your question is incomplete most probably your full question was
a fishing bobber oscillates in simple harmonic motion because of the waves in a lake. the bobber moves a total of 1.5 inches from its low point to its high point and returns to its high point every 3 seconds. write an equation that describes the motion of the bobber, where the high point corresponds to the time t
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How do you calculate total torque?
Torque seems to be equivalent to perpendicular force multiplied through distance.
The force exerted at a radial distance affects the direction of motion of a revolution in a circular motion; torque may halt, start, or alter the course of circular motion; it represents the "unbalanced force" of circular motion. d would be the radial distance, as well as the torque in Newton metres (or N m).
Force has tangential as well as radial components. A driving force F occurs at an angle at such a point P on such a rigid body that can rotate around an axis at a distance r from either the rotational axis. Just the tangential component of F as well as FT can influence the stiff body. The radial component, FR, crosses through into the axis of rotation and therefore can rotate the object.
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A train travels on a track at a constant velocity of 100 kmh
. Inside one of the train cars is a table and book. The table and the book are moving with the train at constant velocity; however, the table and the book are at rest (stationary) relative to each other.
Using Newton's third law of motion, what is the force relationship between the table and the book? Does it matter that the train is moving?
The table and the book would be moving in the opposite dierection as the train because the train is in motion.
What is the Newton third law?Newton's laws of motion are three fundamental laws that describe the relationship between the motion of an object and the forces acting on it.
From the statement of the Newton third law, the force that is acting on the books is as a result of the force that is acting on the train from the engine and that would be in the opposite direction as we can see in the question.
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What is the velocity of the ball at the top?
The velocity of the ball at the top of a projectile's trajectory is zero just because object is at the highest point of its trajectory and it's in stationary phase.
When an object is projected into the air, it is subject to the force of gravity pulling it downward. This force causes the object to follow a parabolic trajectory, where the velocity of the object changes constantly. As the object reaches the highest point of its trajectory, it has reached its maximum height and its upward velocity is zero. The object is at the highest point of its trajectory and it's not moving, so the velocity is zero. It is important to note that this is true for a projectile under the effect of gravity only. If there were other forces acting on the projectile, like air resistance, the velocity at the highest point would not be zero.
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Where does the direction of the torque vector depend?
The torque vector's direction has been determined by the direction of force mostly on axis.
An arrow is a convenient technique to depict a vector since it easily indicates both length and direction. A real number would be a useful way to describe a scalar that changes length when multiplication by a vector. Three visual representations with identical vectors are shown on the left.
They are identical because they all have the same length and direction, i.e. they remain parallel to one another. Their position in the space is unimportant.
A vector would be the essential element that comprises what is known as more than just a vector space to a mathematician, supporting the processes of scaling, through sole source of information as scalars, and addition between vectors. When we use vectors to express physical quantities like as velocity, acceleration, as well as force, we may abandon this abstract formulation in favour of a more specific one.
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Please help on all the questions I will post 50 points each
Last option is
Always zero at it falls”
As an object falls down, its gravitational potential energy decreases because, as the height decreases, potential energy of an object decreases.
What is gravitational potential energy ?Gravitational potential energy of an object is the energy stored on it by virtue of its position in a gravitational field. The energy stored is directly proportional to the mass m and the height above the surface.
thus, P = mgh
where g is the acceleration due to gravity.
When a body falls from a height, its potential energy is converting to the kinetic energy. Hence, the total mechanical energy of the body will be constant.
Therefore, as an object moves down, its kinetic energy increases and gravitational potential energy decreases. Hence, option c is correct.
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Answer:
potential energy decreases,
Explanation:
the coefficient of static friction is 0.754 between the soles of a 60.0 kg sprinter's running shoes and the level track surface on which she is running. determine the maximum acceleration she can achieve. do you need to know that her mass is 60.0 kg?
Yes, the information that the sprinter's mass is 60.0 kg is needed to find the normal force and to determine the maximum acceleration.
To determine the maximum acceleration that the sprinter can achieve, we need to know the coefficient of static friction between the soles of her shoes and the track surface, as well as her weight (force of gravity acting on her).
The coefficient of static friction can be used to calculate the maximum force of friction (friction force = coefficient of static friction x normal force).
The normal force is equal to the weight of the object, which is given as 60.0 kg. So the normal force is : 60.0 kg x 9.8 m/s^2 = 588 N.
The maximum force of friction is: friction force = coefficient of static friction x normal force
= 0.754 x 588 N
= 445.5 N
The maximum acceleration can be determined by dividing the force acting on an object by its mass.
a = F / m
= 445.5 N / 60.0 kg
= 7.4 m/s^2
So the maximum acceleration the sprinter can achieve is 7.4 m/s^2
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What happens to kinetic energy at 0K?
At absolute zero, or 0 K, a molecule's kinetic energy is not zero. The molecule's entropy is zero at absolute zero (K), resulting in zero kinetic energy.
At absolute zero, molecules have no kinetic energy, in accordance with the Kinetic Molecular Theory. Without kinetic energy, molecules cannot move in translation. But even at absolute zero, all particles have a zero-point energy, according to quantum mechanics.
When a substance is cooled to absolute zero, the molecules' kinetic energy significantly decreases, which causes the molecules to slow down and start to group together.
The process of cooling entails taking away a body's heat energy.The system's thermal energy is increased by heat.The molecules get additional kinetic energy as heat is supplied.Their mobility increased as a result.The particles slow down as the heat is removed.To know more about kinetic energy
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i need helppppppp…………
The way that Seon can rewrite his hypothesis to be a statement that will more likely be supported is option B. change the dependent variable to "If the angle at which the balloon is launched moves closer to 45 degrees
What is the hypothesis about?Seon could also design his experiment to test this new hypothesis by measuring the distance along the ground for different angles, starting at around 45 degrees and increasing up to 90 degrees. He could then analyze the data to see if the distance along the ground increases up to a certain point and then decreases beyond that point.
Therefore, A, C, and D are not appropriate rewrites of the hypothesis as they don't take into account the findings that the distance along the ground began to decrease again when the angle reached about 45 degrees. B is a better option as it takes into account that the distance along the ground will increase as the angle moves closer to 45 degrees and decrease as it moves beyond that point.
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See transcribed text below
For a final project in Seon's physics class, students were instructed to build a water balloon launcher, write a hypothesis, and then carry out an experiment with the launcher. Considering that 90 degrees means launching the balloon straight up into the air and 0 degrees means launching it straight along the ground, Seon first wrote the hypothesis below.
If the angle at which the balloon is launched decreases from 90 degrees, then the distance that the balloon goes along the ground will increase, because more energy will go into pushing the balloon forward than upward.
Seon found that this was true until the angle reached about 45 degrees, and then the distance along the ground began to decrease again. Seon knows that he will need to write a new explanation, but he would like to conduct an experiment that is based on his original
Mark this and return
How could Seon rewrite his hypothesis to be a statement that will more likely be supported?
A. change the independent variable to "If the angle at which the balloon is launched increases up to 90 degrees
B. change the dependent variable to "If the angle at which the balloon is launched moves closer to 45 degrees
C. change the independent variable to "If the angle at which the balloon is launched moves closer to 45 degrees...
D. change the dependent variable to "If the angle at which the balloon is launched increases to 90 degrees.
what is the smallest height needed to make a wave?
Hey there!
Answer and Explanation:A wave can be made at any magnitude of amplitude. Therefore, the smallest height needed to make a wave is at any height.
A wave is a disturbance which travels through a medium transferring energy from one point to another without causing any permanent displacement of the medium.
The height needed by a wave is its amplitude. We can define amplitude as the maximum displacement of wave from original position.
A wave can be made at any magnitude of amplitude. Therefore, the smallest height needed to make a wave is at any height.
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What two inventions opened up scientific exploration?
Both the microscope and the telescope were invented during the Renaissance and that two inventions opened up scientific exploration.
An exploration in science is what?Exploration Science is the practice and study of field research applied to real-world problems using a range of techniques, tools, and strategies.
When children explore science, they gain more than just a basic understanding of the subject, according to research that was funded by Ready to Learn. It improves language, literacy, and critical thinking abilities that result in the capacity to reason logically and solve problems creatively.
Exploratory, descriptive, and explanatory are the three categories into which scientific research projects can be divided according to their goals.
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What is the exact value of sin 60°? radical 3 over 2 radical 2 over 2 one half 0
The precise value of sin 60 degrees is 3/2, as solved by trigonometry.
What is the value of sin 60°?0° Cos = Sin 90° = 1
Cos 30°= Sin 60°= 1/32
45° Cos = Sin 45° = 1/2
60° Cos = Sin 30° = 1/2
90° Cos = Sin 0° = 0
Also,
Tan 0 degrees = Sin 0 degrees/Cos 0 degrees = 0 degrees
Tan 30 degrees = Sin 30 degrees/Cos 30 degrees = 1/3
Tan 45 degrees = Sin 45 degrees/Cos 45 degrees = 1
Sin 60°/Cos 60° = 3
Sin 90°/Cos 90°= Tan 90°
The above trigonometric ratio values are in degrees. We can also talk about the values in terms of radians. Radians are used for unit circles with radius one. The radian is represented as.
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What is the y position of the cannonball when it is at distance D/2 from the hill? If you need to, you can use the trajectory equation for this projectile, which gives y in terms of x directly: y=H−gx22v20x
The y position of the cannonball when it is at a distance of D/2 from the hill can be found using the trajectory equation for a projectile.
The equation is y=H−gx22v20x, where H is the height of the hill, g is the acceleration due to gravity, v0 is the initial velocity of the projectile, and x is the distance from the hill.
Substituting in the known values and solving for y, we find that the y position of the cannonball is
y= H−gD/2×22v×20×D/2.
=H-gD11v10D
In other words, the y position of the cannonball at a distance of D/2 from the hill is equal to the hill's initial height minus one-half of the product of the acceleration due to gravity, the distance D, and the initial velocity of the projectile, all divided by the initial velocity of the projectile.
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for what amount of time must you swim in order to work off three cookies if swimming consumes 520 c/h ?
You should swim for 1.5 hours in order to work off three cookies if swimming consumes 520 c/h .
Swimming is an effective way to burn calories, and can help you work off those pesky extra treats. To burn off just three cookies, you'll need to swim for approximately 1.5 hours.
Here's the math: 3 cookies contain approximately 540 calories, and swimming at 520 calories per hour means you'll need to swim for 1.5 hours in order to burn off the equivalent of three cookies.
Calories can be described as the measuring unit for the amount of energy in a food. If cookies have 520 calories then you need to swim for a time of 1.5 hours to burn those 520 calories.
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a negatively charged rubber rod is brought near the knob of a positively charged electroscope. the result is that:
The correct option is D) Negative
The negative charges pass on to the electroscope due to induction which causes the electroscope leaves to move further apart.
Induction refers to the process of producing an electromotive force (EMF) in a conductor due to a change in the magnetic field around it. This principle is known as Faraday's Law of Induction. The EMF produced by induction can be used to generate an electric current in a conductor. Induction is the basis for the operation of transformers, generators, and many other electrical devices.
In the process of induction, a changing magnetic field is produced when a current is flowing through a wire. This changing magnetic field induces a voltage in a nearby conductor. If the conductor is part of a closed circuit, an electric current will flow, creating an electromotive force.
Therefore, The correct option is D) Negative
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What is the formula for net torque?
The formula for net torque is T=flsinФ which is the cross product of perpendicular force multiplied by distance.
When displaced from equilibrium, the system experiences a net force or torque in a direction opposite to the direction of the displacement. Equilibrium is independent of displacement from its original position
Energy is conserved so same amount of energy with or without machine Angular Momentum conserved if net external torque is zero Linear Momentum conserved if net external force is zero. Kinetic Energy conserved if elastic collision.
The first condition necessary to achieve equilibrium is the one already mentioned: the net external force on the system must be zero. Expressed as an equation, this is simply net F = 0 but Note that if net F is zero, then the net external force in any direction is zero. For example, the net external forces along the typical x- and y-axes are zero.
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What is the relationship between force lever and angle torque?
The force acting perpendicular to a lever arm is multiplied by the length of the lever arm to create torque. The scalar quantity torque can be oriented either clockwise or anticlockwise.
When a force is applied perpendicular to a lever arm, a torque is produced. The length that extends perpendicularly from the pivot point, or the centre of rotation, to the point at which the force is exerted, is known as the lever arm or moment arm. A pivot point is always used to define a torque.
With each gearing level, a torque multiplier amplifies the torque applied to the bolt. For instance, an output will be produced by a 5:1 torque multiplier. As an illustration, a torque multiplier with a 5:1 ratio will produce five times the torque at the shaft, but since no energy can be produced, the speed will only be one-fifth of the original.
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what device was used to measure the magnetic field intensity, allowing scientists to study the magnetic properties of rocks?
Mineral magnetism an instrument frequently used to measure magnetic hysteresis is a vibrating sample magnetometer. The study of the magnetic characteristics of rocks, sediments, and soils is known as rock magnetism.
Paleomagnetism's desire to comprehend how rocks preserve the Earth's magnetic field gave rise to the field.
The investigation of rock magnetism. An instrument frequently used to measure magnetic hysteresis is a vibrating sample magnetometer. The study of the magnetic characteristics of rocks, sediments, and soils is known as rock magnetism. Paleomagnetism's desire to comprehend how rocks preserve the Earth's magnetic field gave rise to the field.
When magnetic minerals occur in rocks, they can record the strength and direction of the magnetic field.
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How much force must be applied on a blade of length 4cm and thickness 0.1mm to exert a pressure of 5000000 pa
Answer:
20N
Explanation:
L1 = 4 cm = 0.04 m
L2 = 0.1 mm = 0.0001 m
Area = 0.04 × 0.0001 = 0.000004 m²
Pressure = 4000000 Pa
Force = 4000000 × 0.000004 = 16 N
How much work must be done to stop a 1215 kg car moving at 100 km/h in a straight path.
As a measure of inertia, which is a fundamental characteristic of all matter, mass is used in physics.
What is mass ?As a measure of inertia, which is a fundamental characteristic of all matter, mass is used in physics. Effectively, it is the resistance a body of matter offers to a change in its speed or position as a result of the application of a force. The change caused by an applied force is proportional to the mass of the body.
The amount of matter that makes up any object or body is best referred to as its mass. All of the objects we perceive have mass. There is mass in objects like tables, chairs, beds, footballs, glasses, and even air. As a result, every object has a mass, which determines whether it is light or heavy.
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