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GrogVix [38]
3 years ago
5

A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues ag

ainst the student’s opinion?
Physics
1 answer:
yarga [219]3 years ago
4 0
Theories are usually backed up with a lot of evidence. If the evidence is well studied then it is useful information.
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Choose the correct statement regarding energy production in the interior of a star and energy production in a power plant. A sta
sergij07 [2.7K]

Answer:

A star uses fusion as an energy source by building larger atoms from smaller atoms.

Explanation:

Nuclear fission and fusion are two processes at which an atomic nucleus is changed to produce energy. Fission is the process splitting heavy atomic into lighter atomic nuclei.

So, fusion is the combination of smaller atoms to form larger atoms and star uses this as source of energy.

Fusion is the process at which light atomic nuclei are merged or fused together to form heavier nuclei.

The energy source for all stars is nuclear fusion. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become a helium atom.

8 0
3 years ago
Read 2 more answers
in this model, the velocity of the spacecraft at position 2 is A.) equal to B.) greater than C.) less than the velocity of the c
finlep [7]
<h2>1. Right answer: the velocity of the spacecraft at position 2 is <u>greater than</u> the velocity of the craft at position 4. </h2>

This is due the gravity field of the planet (The Earth in this case) is used to accelerate the craft. This is true when in a specific point the direction of the movement of the craft is the same direction of the movement of the planet.

In this case the craft will be “catched” by the Earth’s gravitational field, making the craft  to enter a circular orbit.

<h2>2. Right answer: At position 1, the direction of the spacecraft changes because of <u>the gravitational force between Earth and the spacecraft. </u></h2>

As explained in the prior answer, this is the exact and correct point where the trajectory of the spacecraft enters into a circular orbit because of the attraction due gravity of the Earth and therefore changes its direction.


<h2>3. Right answer: Position 3 represents <u>the orbital path or velocity of Earth </u></h2>

Being this the orbital path of the Earth and considering the trajectory of the craft, the condition of accelerating the craft is accomplished.

If the orbital path of the Earth were the opposite from the shown in the figure, the effect on the craft would be braking.

Note all of these is related to the <u>gravitational assistance. </u>

<u>Gravitational assistance</u> is the maneuver in which the energy of the gravitational field of a planet or satellite is used to obtain an acceleration or braking of the probe changing its trajectory.

This maneuver is also called <em>slingshot effect, swing-by</em> or <em>gravity assist</em>. It is a common technique in space for the outer Solar System missions , in order to save costs in the launch rocket and thrusters.


6 0
3 years ago
Read 2 more answers
A light horizontal spring has a spring constant of 167 N/m. A 2.77 kg block is pressed against one end of the spring, compressin
aalyn [17]

Answer:

μ = 0.189

Explanation:

The spring potential energy will convert to work of friction

    Fd = ½kx²

μmgd = ½kx²

       μ = kx²/2mgd

       μ = 167(0.132²) / (2(2.77)(9.81)(0.284))

       μ = 0.18852424...

5 0
2 years ago
Fill in the blanks in the following paragraph to correctly identify phenomena that help provide evidence for the particle nature
ValentinkaMS [17]

An electron absorbs energy and emits electromagnetic radiation based on its transition.

<h3>What is an Electron?</h3>

This is defined as a sub-atomic particle which has a negative charge. It's involved in a chemical reaction which results in the formation of new substances.

Classical physics predicted that at a high enough temperature, ultraviolet light would be emitted. instead white light was emitted resulting in the ultraviolet radiation.

Read more about Electron here brainly.com/question/13998346

#SPJ1

4 0
1 year ago
Which statement accurately describes a La Niña event? It is the cause of an El Niño event. Its effects are localized, not global
VikaD [51]

It has the opposite effect of an El Niño event.

7 0
3 years ago
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