The one and only way to ensure that power off in a system, circuit, or piece of equipment is to measure the voltage with a known working meter.
What is meant by power off in a circuit?Turn off the power in the circuit by selecting it with the circuit breaker on the electrical panel. Place the voltmeter on the two output points at the bottom of the circuit breaker to ensure that the power is turned off. If the light does not illuminate, the voltmeter will indicate that there is no voltage.When the circuit switch is turned off, no electricity flows, and the circuit is said to be open.An electric switch is an appliance that disrupts the flow of electrons in a circuit. Light switches have a simple design and are primarily binary devices: they are either fully on or fully off. The circuit is broken and the power flow is interrupted when the switch is turned off.To learn more about electric circuit refer to :
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why is a battery used when we require more electricity
A battery is used when we require more electricity because it can store and release electrical energy as needed.
Batteries consist of one or more cells, each of which contains two electrodes and an electrolyte that allows for the flow of charged particles between the electrodes. When a battery is connected to a device, the charged particles flow from the positively charged electrode to the negatively charged electrode, providing a flow of electricity.
The amount of electricity stored in a battery is limited, but it can be released as needed, even when the source of the electricity is not available. This makes batteries useful for supplying electrical energy in situations where there is a temporary increase in demand, such as when more devices are turned on or when the source of electrical energy is unavailable, such as during a power outage.
Additionally, batteries are portable and can be easily carried, making them useful for supplying electrical energy in remote locations where there is no access to the electrical grid.
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A body moves with uniform velocity, what will be its acceleration.
Explanation:
zero.
when the speed (velocity) does not change, there is no acceleration (which means the measure about how much the speed or velocity changes).
How many amperes of current will flow through a circuit that has 4.0 ohms of resistance and js powers by a 16 volt battery
The current flowing in the circuit is 4 A.
What is the current flowing in the circuit?
The current flowing in the circuit is the rate of flow of charges per second.
The magnitude of the current flowing in the circuit can be calculated by applying Ohm's law as shown below.
V = IR
where;
I is the current flowing in the circuitR is the resistance of the circuitThe magnitude of the current is calculated as;
I = V/ R
I = 16 V / 4 ohms
I = 4 A
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g how does the pressure at each of the five points change if the tank and its previous contents were buried an extra 1 meter below the current level such that the pipe to the surface is now 3 meters long?
The pressure at each of the five points would increase by ρg × 1 Pa.
The pressure at each of the five points would increase if the tank and its previous contents were buried an extra 1 meter below the current level. The pressure at a point in a fluid is proportional to the height of the fluid column above that point. Since the pipe to the surface is now 3 meters long, the height of the fluid column above each of the five points has increased by 1 meter. Hence, the pressure at each of the five points would increase by an amount proportional to the height of the fluid column, or P2 = P1 + ρgh, where P1 is the original pressure, P2 is the new pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the increase in height. As a result, the pressure at each of the five points would increase by ρg × 1 Pa.
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how does a wheel involve physics
when you drop an object, does its speed (a) suddenly go from zero to some fixed value or (b) start from zero and increase continuously? use your plot of v vs. t to justify your answer.
(b) start from zero and increase continuously.In free fall motion,speed of the object increases continuously due to gravitational acceleration (g),till the terminal speed.
Can an item be at rest and have zero acceleration?Newton's First of Motion, often known as the Law of Inertia, states that if an object experiences no net force at all, it will likewise experience no acceleration.Zero acceleration describes an item at rest.An object experiences zero acceleration if it keeps moving in a straight path at a constant speed.
If speed is not zero, can velocity be zero?The displacement of a moving body with the identical initial and terminal points is zero, but the distance traveled is not.As a result, it possesses a non-zero speed and zero velocity.
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two trains are traveling towards each other 120 milesat speeds of 40mph and 50 mph. how long does it take for them to collide?
The two trains' aggregate mechanical speed is 30 + 40, or 70 miles per hour. Therefore, they must be 70 miles apart when they meet one hour prior (in the final 1 hour they will cover 70 miles to meet).
How do two trains pass one another mathematically?After meeting, the trains' crossing time is calculated as (L1+ L2)/(S1+ S2). The sum of the train lengths and speeds in this case represents the overall distance to be traveled.
What is the time required for two trains to pass one another?The faster one must pass the slower one entirely in 60 seconds while they are both traveling in the same direction. They totally pass each other in 10 seconds if they are traveling in the opposite directions.
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a convex lens of focal length 18.0 cm is used as a magnifying glass. at what distance from a tiny insect should you hold this lens to get a magnification of ?3.00?
12 cm is the distance from a tiny insect should you hold this lens to get a magnification of 3.00
How far away from an object should you set a convex lens with an 18 cm focal length?f = 18 cm is a convex lens's focal length.Object separation, u =?The object is therefore 72 centimeters away.The object needs to be located 72 cm away from the lens.
apply 1/f = 1/u +1/v, magnification m = -v/u = 3, so v = -3u, so f = uv/u+v, f = u* -3u/(-2), u = 2f/3, u =2* 18/3, u = 12 cm.
What image does a magnifying glass create?
The magnifying glass's image will be virtual, upright, and bigger than the thing as a result.Note: Binoculars, telescopes, and microscopes all require magnifying glasses.Because a convex lens is used within a magnifying glass, it is curved inward.
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for one-dimensional steady-state conduction in a plane wall with no heat generation, the heat flux is independent of x. group of answer choices true false
True. The heat flux is independently of x for only one steady-state conduction in some kind of a planar wall without heat creation.
What are heat flux and what is its unit?The thermal energy that is emitted over a concrete surface is known as heat flux, and its unit is W/m2. The equation dotq = fracQA can be used to determine heat flow.
How is the heat flux determined?The source of energy flux at the surface of a hard object is frequently a combination of convective and contributions. By allowing this heat to pass throughout a heat flux sensor, conductive and convective heat fluxes can be monitored. Heat flux monitors are either embedded in or installed on the surface of an solid item.
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describe the shape and location of a gaussian surface that can be used to determine the electric field at point p due to the long cylinder
To determine the electric field at point P due to a long cylinder, a cylindrical Gaussian surface should be used.
The Gaussian surface should be centered on the point P, and should be oriented along the axis of the cylinder. The surface should be perpendicular to the electric field vector, and should enclose the entire cylinder.
A Gaussian surface is a closed surface in three-dimensional space through which the flux of a vector field is calculated. It is typically used to calculate the electric flux of an electric field or the gravitational flux of a gravitational field.
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a scanning electron microscope produces an image using a beam of electrons acceler- ated through a 30 kv potential difference. what is the speed of the electrons?
Using an electron beam that has been accelerated through a 30 kv potential difference, a scanning electron microscope creates an image at a speed of 0.012 1023 m.
What constitutes a potential difference?Difference that might exist between any two points The amount of work required to move a unit positive charge along any path from one point to another without accelerating is referred to as the electric field.
Accelerating voltage=V=30kV
Using de-Broglie's equation.
λ= p/h ⟶(1)
λ=Wavelength of moving particle.
P=Momentum of moving particle.
h=Planck's constant=6.63×10⁻³ Js
now from mechanics we know,
P= √2mk = √2mqV
Where, P=momentum of particle
M=mass of particle.
K=Kinetic energy of particle.
V= Electric potential of particle( Accelerating voltage).
q=charge of particle.
In the case of electron, q=e=1.6×10⁻¹⁹ C
Substitution of (1)
λ= √2meV/h
λ = 6.63 × 10⁻³⁴/√2 × 9.1 × 10⁻³¹ × 1.6 × 10¹⁹ × 30 × 10³
λ = 6.63 × 10⁻³⁴/546 × 10⁻⁹
λ = 0.012 × 10⁻²³m
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what type of pressure is produced from the stones being pushed together?
Whenever heat and pressure change an original as well as parent rock together into completely different rock, a metamorphosed rock is produced. The parent rock may be a sedimentary or metamorphic rock.
How does pressure feel in real life?Try pressing a bleeding bandage on some fruit to quickly show the concept of pressure. Fruit won't have their surface cut if the flat portion of the blades is pushed against it. The troops is extensively scattered over the region (low pressure).
Is pressure an energy?The averaged velocity transfer for every unit area in units of time caused through molecular collisions here between confined gas as well as its boundary is what the kinetic theory with ideal gases defines as air pressure.
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In Platos credo, Socrates, believes that he should follow the laws of the state Athens, because?
In Plato's philosophy, Socrates believed that he should follow the laws of the state of Athens because he believed in the idea of the "philosopher-king."
Who was Socrates?
Socrates was a classical Greek philosopher, credited as one of the founders of Western philosophy. He is best known for his method of inquiry, called the Socratic method, and for his teaching style, which was dialogic and aimed at getting students to think critically and develop their own ideas.
According to Socrates, the laws of the state were a reflection of the absolute and unchanging moral values that exist in the world. He believed that as a philosopher, it was his duty to live in accordance with these moral values, and thus to follow the laws of the state. In this way, Socrates saw himself as a servant of the divine, and believed that by following the laws, he was serving the greater good and promoting the welfare of the city.
Hence, In Plato's philosophy, Socrates believed that he should follow the laws of the state of Athens because he believed in the idea of the "philosopher-king."
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moral lesson learnt from the sermon on the mount
Blessed are the merciful: for they shall obtain mercy is the moral lesson learned from the sermon on the mount
What is the Sermon on the Mount's main message?
Christians learn the following crucial lessons from this sermon: The things we own here on Earth don't matter. Good people will discover meaningful spiritual "treasures" in Heaven. God will take care of people, so they shouldn't be concerned.
In the Sermon on the Mount, what did Jesus say?
1. And, seeing the crowds, he climbed a mountain: His disciples came to him after he was set.
2. And he spoke to them, saying
3. Because the kingdom of heaven is theirs, those who are poor in spirit are blessed.
4. Happy are the bereaved because they will find comfort.
Who wrote the sermon on the Mount?
Scholars put forth a number of arguments for the claim that Matthew is the author of the Sermon on the Mount, but only using New Testament sources.
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a mover weighing 847 n is pushing a piano weighing 2145 n down a hallway. the force the mover exerts on the piano is 249 n south. state how much force the piano exerts on the mover and in what direction.
The piano exerts a force of 249 N to the north on the mover.
The force the piano exerts on the mover is equal in magnitude but opposite in direction to the force the mover exerts on the piano. This is because of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.
The force the piano exerts on the mover is 249 N to the north, since it is opposite in direction to the force the mover exerts on the piano, which is 249 N to the south.
So, the force the piano exerts on the mover is 249 N to the north.
To summarize, the mover weighing 847 N is pushing the piano weighing 2145 N down a hallway, and the force the mover exerts on the piano is 249 N south. According to Newton's Third Law of Motion, the piano must exert an equal and opposite force on the mover. Thus, the piano exerts a force of 249 N to the north on the mover.
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two children of identical mass sit on a merry-go-round. one sits 0.5m from the center, and the other sits 3m from the center. if the children are in a straight line form the center, which child has a greater speed?
Centripetal force is equal to mv2/r for the youngster about 0.5 meters from the center. Due to the fact that more ground is traversed in a given has a higher moving direction than the youngster closest to the edge.
Are kids accelerating on a merry-go-round?The youngster on the joyful is moving in a uniform circular motion, which means that while the child's overall speed is constant, its direction is changing at each point. A change in magnitude, direction, or both can cause a change in velocity. When there is an rate of alteration in velocity, acceleration takes place.
Does more material equal so much centripetal force?The magnitude of an object's centripetal acceleration (a) when it performs a uniform motion as a result, the mass of the object has no bearing on the centripetal acceleration.
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a plank is balanced in its center. a 100 n bucket is placed 0.66 m from the center of the plank. how far from the center on the opposite side must a 50 n weight must be placed to balance the bucket.
The 50 N weight must be placed 1.32 m from the center on the opposite side to balance the 100 N bucket.
The formula to find the distance, d, from the center that a weight must be placed to balance a weight placed a distance, x, from the center is:
d = x * (m1 / (m1 + m2)),Where:
m1 and m2 are the masses of the weightsIn this case:
m1 = 100 Nm2 = 50 NPlugging these values into the formula, we find:
d = 0.66 m * (100 N / (100 N + 50 N)) d = 0.66 m * (100 N / 150 N) d = 0.66 m * (2 / 3) d = 1.32 mHence, in order to balance the 100 N bucket, the 50 N weight must be positioned 1.32 m from the center on the opposite side.
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how do you determine the components of a vector using the magnitude and angle? how does multiplying a vector by a scalar affect its components
To determine the components of a vector using its magnitude and angle, you can use trigonometry.
The x-part of a vector rises to the vector extent times the cosine of the point, and the y-part of a vector rises to the vector greatness times the sine of the point. So the part can be composed as:
x part = size * cos(angle)
y part = size * sin(angle)
Increasing a vector by a scalar influences greatness yet not course. The size of a vector is duplicated by a scalar, and the parts of a vector are increased by a scalar. So on the off chance that a vector has (x, y) parts, duplicating it by the scalar "k" yields another vector with (kx, ky) parts.
The bearing of the vector doesn't change. While deciding the parts of a
vector, you can utilize the size and point to track down the x and y parts. For this we can utilize geometry. Here, duplicate size by the cosine of a point to get the x part and increase greatness by the sine of a point to track down the y part. Duplicating a vector by a scalar influences the size of the vector, causing it to develop or recoil contingent upon the worth of the scalar, however doesn't adjust the vector's course. Vector parts are increased by scalars also.
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Describe why a bowling ball and a baseball dropped off of a cliff at the same time would land at different times, but they would land at the same time in a vacuum.
A car starts traveling with a velocity of 15 m/s and accelerates at a speed of 0.5 m/s 2 within 12 seconds. What is the displacement of the car that it traveled? Report your answer with the correct units.
The displacement of the car is 180 m it traveled.
What is the displacement ?Displacement is the distance between two points in a certain direction. It is usually measured in terms of length, such as kilometers or miles. Displacement is a vector quantity, which means that it has both magnitude and direction. It is different from distance because displacement is the shortest distance between two points, while distance is the total amount of space traveled between two points. Displacement is commonly used in physics to calculate the change in position of an object over time. It can also be used to measure the change in velocity or acceleration of an object.
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a wrench cm long lies along the positive -axis and grips a bolt at the origin. a force is applied in the direction at the end of the wrench. find the magnitude of the force needed to supply of torque to the bolt.
A 30 cm long wrench is positioned at the origin, along the positive y-axis, and is holding a bolt. Just at end of the wrench, a force is exerted in the direction of "0, 3, and 4"
What does force in physics mean?
You can also use words like extend and squeeze to describe force. Force is described in physics as the pull or push that causes a massed object to change its speed. Force is an outside agent that has the power to alter a body's resting or moving position.
What function does force serve?
For instance, if there is no opposition, force is defined as the interaction that modifies an object's motion. When we look attentively at this sentence, we can see how push-pull plays a part in it. A pull is defined as a force that causes an object to move closer to you. On the other side, it is a shove if it travels away.
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if the centripetal force on a 3.30 kg object is 14.5n, and the object is 1.90 m from the center of the circle, what is its tangential velocity?
If the centripetal force on a 3.30 kg object is 14.5 N, and the object is 1.90 m from the center of the circle, then the tangential velocity of the object will be 7.50 m/s.
Weight of the object is 3.30 kg ⇒ m = 3.30 kg.
The object is placed 1.90 meter away from the center of the circle and the centripetal force acting on the object will be 14.5 N .
F = 14.5 N and r = 1.90 m.
Centripetal force will be F = m × a = m × v² / r
So, v = sqrt of (F × r / m)
⇒ sqrt (14.5 N × 1.90 m / 3.30 kg) = sqrt (51.85 N × m / kg) = sqrt (51.85 N × m / kg) = 7.50 m/s.
Then the tangential velocity of the object will be 7.50 m/s.
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the cliff divers at acapulco, mexico, jump off a cliff 28.7 m above the ocean. ignoring air resistance, how fast are the divers going when they hit the water?
The divers going when they hit the water at 23.1m/s speed
How does air resistance function?
Air exerts a force known as air resistance. When an object is travelling through the air, the force works in the opposite direction. While a sports vehicle with a streamlined design will encounter reduced air resistance and experience less drag, the automobile will be able to move more quickly than a truck with a flat front.
The law of conservation of energy allows us to calculate the speed of the divers when they strike the ground because their potential energy at a height of 28.7 meters above the ground is transformed into kinetic energy at ground level.
Potential Energy =Kinetic Energy
PE=KE
mgh = 1/2mv²
gh = 1/2v²
g = 9.81m/s²
v = √2gh
v = √2 × 9.81 ×2 × 28.7
v = 23.1 m/s
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What is the coefficient of kinetic friction if a car going at 20 m/s stops in 50 m?
A automobile stopped after driving 50 meters at the a pace of 20 m / sec. Count on the rate of slowing being constant. Us = 0.5 and Uk = 0.03 are indeed the coefficient of friction between the seat and the user.
What is friction in human?A force known as friction works between two systems to stop any motion including attempted motion. Its normal force N that has been bringing the systems together has an inverse connection with the simple friction.
What negative effects may friction have?Here following is an overview of friction's detrimental effects: Friction among various mechanical parts causes a substantial quantity of heat to be wasted as heat. Since movement is constrained, it takes more energy to go around it. Using a machine when it is making noise is useless and irritating.
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for a cooking appliance, the overall energy supplied to the appliance is 5 kwh and only 4 kwh is transferred to the food. what is the appliance's efficiency?
80% is the appliance's efficiency
Why do appliances use less energy?
Among the several advantages of energy efficiency are: Environmental: Greater efficiency can reduce water use, greenhouse gas (GHG) emissions, and other pollutants. Economic benefits of energy efficiency improvements include reduced utility costs, job growth, and reduced price fluctuation of power.
Utilizing the formula below, efficiency may be represented as a ratio: Output ÷ Input. The total amount of beneficial work accomplished, excluding waste and spoilage, is known as output or work output. Efficiency can also be expressed as a percentage by dividing the ratio by 100.
Efficiency will be 4/5 *100 i.e. 80%
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the planet in the orbit shown in the drawing obeys kepler's laws. during which of the portions of the planet's orbit (a, b, c, or d) would the planet experience an increase in speed for at least a moment?
The planet experience an increase in speed for at least a moment as it approaches the sun.
What are Kepler laws?The three laws of Kepler are -
The orbit of a planet is an ellipse with the Sun at one of the two foci.A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.The square of a planet's orbital period is proportional to the cube of the length of the semi - major axis of its orbit.Given is the planet in the orbit shown in the drawing obeys Kepler's laws.
The planet moves faster when it is nearer the Sun and slower when it is farther from the SunTherefore, the planet experience an increase in speed for at least a moment as it approaches the sun.
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2
A simple circuit contains a battery and a resistor.
Over 3.0 hours, 29 000 C of charge passes through the resistor.
Calculate the current flowing through the circuit during this time.
Give your answer to two significant figures.
Answer:
Approximately [tex]2.69\; {\rm A}[/tex].
Explanation:
Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:
[tex]\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}[/tex].
Electric current [tex]I[/tex] is the rate of flow of electric charge.
In order to find the electric current, divide electric charge [tex]q[/tex] by the time [tex]t[/tex] required to transfer these charge. If charge [tex]q\![/tex] is measured in coulombs and time [tex]t\![/tex] is measured in seconds, the unit of current [tex]I[/tex]would be amperes:
[tex]\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}[/tex].
The ultrasonic transducer used in a medical ultrasound imaging device is a very thin disk (m = 0.10 g) driven back and forth in SHM at 1.0 MHz
by an electromagnetic coil.
The mass of the ultrasonic transducer used in a medical ultrasound imaging device is 0.10 g and it is driven back and forth in simple harmonic motion (SHM) at 1.0 MHz. The frequency of 1.0 MHz means that the disk oscillates back and forth 1 million times per second. The disk's oscillations in SHM are crucial to the functioning of the medical ultrasound imaging device.
In a medical ultrasound imaging device, the transducer sends and receives high-frequency sound waves that are used to create images of internal organs, tissues, and blood flow. The motion of the transducer disk creates these sound waves, which then bounce off internal structures and return to the transducer, allowing for the creation of an image. The thin disk design of the transducer allows for a high frequency of oscillation, which results in higher-resolution images.
The ultrasonic transducer plays a critical role in the functioning of a medical ultrasound imaging device and the high frequency of oscillation it generates is key to producing high-quality images. This information is important to understand the functioning of the medical ultrasound imaging device and how the ultrasonic transducer contributes to the quality of the images produced.
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solved the question belowCalculate the force of attraction between a cation with a valence of +3 and an anion with a valence of -2, the centers of which are separated by a distance of 2.8 nm.
F= _____Calculate the force of attraction between a cation( eV , N , J , nm ) Choose One
the attraction between a +3 valence cation and a -2 valence anion, whose centres are separated by a distance of 2.8 nm. The attraction between two cations is 1.76×10⁻¹⁰ forces.
given,
number of cations,n₁=3
number of anions,n₂=2
center distance between cation and anion,r=2.8 nm=2.8×10⁻⁹m
write the equation force of attraction:
[tex]F=\dfrac{kq_1q_2}{r^2}.[/tex]..............(1)
Here,K is coulombs constant ,K=9×10⁹ Nm²/C²,q =n×e ,e is electronic charge,e=1.60×10⁻¹⁹ coulombs. the attraction between a +3 valence cation.
calculate the value of cation charge q₁
q₁=n₁×e
q₁=3×1.60×10⁻¹⁹
calculate the value of cation charge q₂
q₂=n₂×e
q₂=2×1.60×10⁻¹⁹
substitute the values in equation 1
[tex]F=\frac{(9*10^{9})*(3*1.602*10^{-19}) *(2*1.602*10^{-19} )}{(2.8*10^{-9})^{2} }[/tex]
F=1.76×10⁻¹⁰
The force of attraction between cation is 1.76×10⁻¹⁰.
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When you climb stairs, you expend energy to do work against gravity. The energy you use to climb will convert into an equal amount of gravitational potential energy, so Suppose a 65 kg man uses 10 s to climb a staircase up to a height of 6 m How much power does he use, and how does this power compare to the power used by your highest-consuming device?
The man uses 558.6 watt power during climb a staircase up to a height of 6 m.
What is potential energy?Potential energy is a form of stored energy that is dependent on the relationship between different system components.
When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.
The potential energy gained = 65 × 9.8 × 6 Joule = 5586 Joule.
Hence, his power is = (5586 ÷ 10) Watt = 558.6 Watt.
So, the man uses 558.6 watt power during climb a staircase.
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