How is power defined?
2 answers:
The correct answer to this question is D) The rate at which work is accomplished.
EXPLANATION:
Let us consider a body performs W amount of work due to the application of some external forces.
Let the body does that work during the time interval of t seconds.
Hence, the power of the body is defined as the rate of doing work or the work done per unit time. We know that energy is the capacity to do work. So, power can be defined as the rate of consumption of energy.
Mathematically power can be written as -
Power P = .
Hence, the correct definition of power is that the rate at which work is accomplished.
The power is the rate at which work is accomplished, option is correct.
Further Explanation:
The power is the rate of transformation energy which is used by another body.
The power is the quantity with only magnitude so it is a scalar quantity. <u>The standard of international unit is watt, it is also written as J/s</u>. The standard of international unit watt in honor of James Watt.
A quantity is said as a vector if it has some magnitude and direction in order to give the details regarding the quantity.
A quantity is said as a scalar if it has only the magnitude in order to give the details regarding the quantity.
Concept:
The term power is defined as “The rate at which the work is finished or the energy is transferred from one place to another or transformed into another form.”
The term energy is defined as the capacity to do work or result in some displacement by applying some force.
The expression for power is:
Here, is the power,
is the change in energy and
is the change in the time.
Therefore, the power is the rate at which work is accomplished, option is correct.
Learn more:
1. Work and power brainly.com/question/9566221
2. Calculate power brainly.com/question/2829572
3. Energy and SI unit https://brainly.in/question/1227001
Answer Details:
Grade: Middle school
Subject: Physics
Chapter: Kinematics
Keywords:
Define, power, quantity, work, accomplished, direction, total distance, object, moved, rate, option, D.
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Answer:
(A) considering the charge "q" evenly distributed, applying the technique of charge integration for finite charges, you obtain the expression for the potential along any point in the Z-axis:
With been the vacuum permittivity
(B) The expression for the magnitude of the E(z) electric field along the Z-axis is:
Explanation:
(A) Considering a uniform linear density on the ring, then:
(1)⇒
(2)⇒
(3)
Applying the technique of charge integration for finite charges:
(4)
Been r' the distance between the charge and the observation point and a, b limits of integration of the charge. In this case a=2π and b=0.
Using cylindrical coordinates, the distance between a point of the Z-axis and a point of a ring with R radius is:
(5)
Using the expressions (1),(4) and (5) you obtain:
Integrating results:
(S_a)
(B) For the expression of the magnitude of the field E(z), is important to remember:
(6)
But in this case you only work in the z variable, soo the expression (6) can be rewritten as:
(7)
Using expression (7) and (S_a), you get the expression of the magnitude of the field E(z):
(S_b)
As we know that here no air resistance while ball is moving in air
So here we will say that
initial total energy = final total energy
here we know that
(as it will be on ground at initial and final position)
so we will say
since mass is always conserved
so we will say that final speed of the ball must be equal to the initial speed of the ball
so we have