What energy transformation occurs during the combustion of coal in a power plant?

Two objects are moving at equal speed along a level, frictionless surface. The second object has twice the mass of the first obj

denis23 [38]

Answer:

E)The two objects rise to the same height : h₁=h₂ =( v²) / (2g)

Explanation:

With coefficient of kinetic friction, μk =0:

We apply the principle of energy conservation :

E₀ = Ef Formula (1)

K₀+U₀ = Kf + Uf Formula (2)

K = (1/2) *m*v² Formula (3)

U = m*g*h Formula (4)

Where:

E₀:

Initial total energy (J)

Ef: Final total energy (J)

K₀: Initial kinetic energy (J)

U₀: Initial potential energy (J)

Kf: Final kinetic energy (J)

Uf:

Final kinetic energy (J)

v : speed (m/s)

m: mass (kg)

h : hight (m)

Known data

v₁=v₂=v

m₁=m

m₂ =2m

μk =0 : coefficient of kinetic friction

Problem development

We apply formulas (1), (2), (3) and (4) for the first object ,(1):

E₀₁ = Ef₁

K₀₁+U₀₁ = Kf₁ + Uf₁ U₀₁=0 , Kf₁ =0 , m₁=m

(1/2) *m*v²+0 =0+m*g*h₁ :We eliminate m,then,

(1/2) *v²=g*h₁

h₁ =( v²) /(2g)

We apply formulas (1), (2), (3) and (4) for the second object ,(2):

E₀₂ = Ef₂

K₀₂+U₀₂ = Kf₂ + Uf₂ U₀₂=0 , Kf₂ =0 , m₂=2m

(1/2) *2m*v²+0 =0+2m*g*h₂ :We eliminate m,then,

(1/2) *2*v² =2*g*h₂ : We divide by 2 on both sides of the equation,then,

(1/2) *v²=g*h₂

h₂ =( v²) / (2g)

8 0

3 years ago

If its wavelength were doubled, its energy would be If its wavelength were doubled, its energy would be 4E. 2E. 12E. 14E.

ANEK [815]

The wavelength was doubled, and its energy will be increased by 4 times.

looking at the formula

energy $E = MC^2$

also, $c = \lambda \times \nu$

hence it is clear from above that energy is directly proportional to the square of the wavelength.

hence, The wavelength was doubled, and its energy will be increased by 4 times.

<h3>What is Wavelength?</h3>

The distance over which a periodic wave's shape repeats is known as the wavelength in physics.
It is a property of both traveling waves and standing waves as well as other spatial wave patterns. It is the distance between two successive corresponding locations of the same phase on the wave, such as two nearby crests, troughs, or zero crossings.
The spatial frequency is the reciprocal of the wavelength. The Greek letter lambda is frequently used to represent wavelength.
The term wavelength is occasionally used to describe modulated waves, their sinusoidal envelopes, or waves created by the interference of several sinusoids.

To learn more about wavelength with the given link

brainly.com/question/13533093

#SPJ4

5 0

2 years ago

The vacuum tube was replaced with what electrical component?

Rufina [12.5K]

Answer:

The vacuum tube was replaced with transistor.

Explanation:

The invention of semiconductor was very useful in making solid state transistor that allowed the production of small yet faster, cheaper, and more trusted and reliable computers.
These solid state transistor is so often used that, it nearly replaced all the use of transistor.
This replacement took place after the invention of semiconductor in the year around 1940.
Vacuum tubes also known as thermionic tubes are not used anymore in computers and electronics.

7 0

3 years ago

You obtain a spectrum of an object in space. The spectrum consists of a number of sharp, bright emission lines. Is this object a

Andreyy89

Answer:

In hot gases , the atoms keeps colliding with each other and sometimes the energy liberated during collision takes the electron to a higher level,thus, .The object is a cloud of hot gas and finally the electron returns back emitting photon

6 0

3 years ago

Read 2 more answers

Which shows a correct steps in order of scientific method

yarga [219]

7 Steps of the Scientific Method

Make an observation.

Conduct research.

Form hypothesis.

Test hypothesis.

Record data.

Draw conclusion.

Replicate. Communicate results

8 0

4 years ago