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rodikova [14]
2 years ago
5

What is the most important thing to remember about how to calculate Mechanical Energy?

Physics
1 answer:
nataly862011 [7]2 years ago
6 0

Answer:

The mechanical energy of a classical system is simply equal to the sum of its kinetic and potential energies.

E=T+V

Where the kinetic energy T is given by the equation

T=12mv2

and the potential energy V differs depending on whatever forces are acting on the system.

If the force acting on the object is gravity (a common case) the potential energy is given by

V(r)=GMmr

where the Ms represent the mass of the two interacting objects (The system and the earth, for example), r is the distance between their centers of mass, and G is the universal gravitational constant (=6.67e-11 N m^2 kg^-2)

In simple, close to earth, situations, it takes the simpler form

V=mgh

Where m is the mass of the system, g the gravitational acceleration, and h the height.

Another well-known and important potential energy is that for a spring that obeys Hooke's law.

V(x)=12kx2

The potential energy can otherwise be calculated from its definition; the value of potential energy at a point in space is equal to the negative of the Work needed to bring the object to that point from an arbitrarily chosen reference point in space, which is generally chosen so that the potential energy will never be negative.

This is a very broad question. The most broad answer i can give is that energy (mechanical, potential, chemical, etc...) can all be measured in Joulse. This is a unit for energy. Work and energy are the same, and work is defined as force (mass * acceleration) times a distance. The base unit of force is Newtons (1kg * (9.81 meters / second^2)) and for distance it is Meters, furthermore one joule of energy is equal to one Newton-Meter. There, now we know that one joule of energy is equivalent to moving 1 kilogram of mass at 9.81 m/s^2 over a distance of 1 meter; or any such manipulation of the

It seems, that you lack knowledge of Physics and Mathematics.

Go to Ramamurti Shankar “Fundamental Physics I” on You Tube and try to follow Prof. Shankar. I know no better teacher. Just watch the videos until you have understood all the remarks and expanations. Do not learn formulas by heart; do learn the logic of how to derive those formulas. Try to understand the Principles of Physics. Do not fool yourself. Work seriously and honestly. Use your logic and try to fix your logic. (I hope that you understand what I am talking about.)

With lesson 12–15 of “Fundamental Physics I” you will get the best introduction to Special Relativity Theory. The Lorentz Transformation are just beautiful and … everything follows from them. It will take you only 5 hours if you are smart.

Have you another question ?

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A scientist wants to measure the relationship between humidity in the
ICE Princess25 [194]

Answer:

D

Explanation:

<em>The most suitable testable question. in this case, would be that 'are there more home runs during the more humid months of the  summer?'</em>

Since the aim of the investigation is to find the relationship between humidity and the number of home runs, measuring the number of home runs during the more humid months in the summer and comparing the data to the number of home runs during the less humid months in the same summer would provide the answer.

<u>Only option D raises a valid question that is relevant to the aim of the investigation.</u>

7 0
3 years ago
A 12.0-g plastic ball is dropped from a height of 2.50 m. Just as it strikes the floor, it is moving at a speed of 3.20 m/s. How
nalin [4]

Answer:

0·233 J

Explanation:

Given

Mass of the ball = 0·012 kg

Initially the ball is at a height of 2·5 m

As initially the ball is dropped, it's initial velocity will be equal to 0

Therefore initially it has zero kinetic energy and has only potential energy

∴ Initially total mechanical energy of the ball = potential energy of the ball

Initial potential energy of the ball = m × g × h

where

m is the mass of the ball

g is the acceleration due to gravity

h is the height of the ball

∴ Potential energy = 0·012 × 9·8 × 2·5 = 0·294 J

Velocity of the ball after striking the floor = 3·2 m/s

After striking the floor, the total mechanical energy = kinetic energy just after striking the floor

Kinetic energy = 0·5 × m × v²

where m is the mass of the ball

v is the velocity of the ball

∴ Kinetic energy of the ball = 0·5 × 0·012 × 3·2² = 0·061 J

Mechanical energy that is lost = 0·294 - 0·061 = 0·233 J

∴ Mechanical energy that the ball lost during its fall = 0·233 J

6 0
3 years ago
Three conducting plates, each of area A, are connected as shown.
Shkiper50 [21]
You have effectively got two capacitors in parallel. The effective capacitance is just the sum of the two. 
Cequiv = ε₀A/d₁ + ε₀A/d₂ Take these over a common denominator (d₁d₂) 
Cequiv = ε₀d₂A + ε₀d₁A / (d₁d₂) Cequiv = ε₀A( (d₁ + d₂) / (d₁d₂) ) 
B) It's tempting to just wave your arms and say that when d₁ or d₂ tends to zero C -> ∞, so the minimum will occur in the middle, where d₁ = d₂ 
But I suppose we ought to kick that idea around a bit. 
(d₁ + d₂) is effectively a constant. It's the distance between the two outer plates. Call it D. 
C = ε₀AD / d₁d₂ We can also say: d₂ = D - d₁ C = ε₀AD / d₁(D - d₁) C = ε₀AD / d₁D - d₁² 
Differentiate with respect to d₁ 
dC/dd₁ = -ε₀AD(D - 2d₁) / (d₁D - d₁²)² {d2C/dd₁² is positive so it will give us a minimum} For max or min equate to zero. 
-ε₀AD(D - 2d₁) / (d₁D - d₁²)² = 0 -ε₀AD(D - 2d₁) = 0 ε₀, A, and D are all non-zero, so (D - 2d₁) = 0 d₁ = ½D 
In other words when the middle plate is halfway between the two outer plates, (quelle surprise) so that 
d₁ = d₂ = ½D so 
Cmin = ε₀AD / (½D)² Cmin = 4ε₀A / D Cmin = 4ε₀A / (d₁ + d₂)
7 0
3 years ago
What quantities can be calculated from the bohr equation for the energy levels of the hydrogen atom?
patriot [66]

We can find the energy needed to ionize the hydrogen atom.

We can find the wavelength of a spectral line.

We can find the energy change of the electron moving between two levels.

The first atomic model to adequately explain the radiation spectra of atomic hydrogen was Bohr's model of the hydrogen atom. The atomic Hydrogen model was first presented by Niels Bohr in 1913. Rutherford's model of the hydrogen atom leaves several holes, which Bohr's model of the hydrogen atom tries to fill in.

It has a particular place in history since it introduced the quantum theory, which led to the development of quantum mechanics. Bohr proposed that electrons moved in predetermined orbits or shells with defined radii around the nucleus. It was impossible for electrons to reside between any shells other than those having a radius given by the equation below.

r (n) =n^{2} * r(1)

E (n) = \frac{1}{n^{2} } 13.6eV

Learn more about hydrogen atom here;

brainly.com/question/8806577

#SPJ4

6 0
2 years ago
EXPLAIN how a thermostat uses electric energy, mechanical energy , and thermal energy
notsponge [240]
The appliances with thermostat are designed in such a way that it will provide heat waste energy by converting electrical energy to thermal energy. ... It converts thermal energy into mechanical energy. The nightlight that is used, converts electrical energy to visible light, which is a form of radiant energy.
8 0
2 years ago
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