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Lana71 [14]
3 years ago
9

Bacteria provides a valuable clue to the origin of life on Earth. Which of these is the most likely process by which bacteria wa

s formed? A. appearance of new plants B. adaptation of living things C. geological transformation of Earth's crust D. chemical transformation of non-living matter
Physics
2 answers:
mezya [45]3 years ago
7 0
The appropriate answer is d. chemical transformation of non living matter. Scientists believe that life originated on earth when the conditions present led to the formation of chemicals that contain carbon, nitrogen and oxygen. These are the primary components of organic matter and consequently all living things. Inorganic matter in ancient oceans could have been transformed into amino acids by complex reactions involving extreme heat or lightening.
AURORKA [14]3 years ago
5 0
Hey there!

<span>Bacteria provides a valuable clue to the origin of life on Earth. Which of these is the most likely process by which bacteria was formed?

Answer: </span>
<span> appearance of new plants

Hope this helps! (:
</span>
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A wire carrying a current of 26.9 A is bent into a circular arc with a radius of 0.6 cm that sweeps out 0.900 radians. What is t
melomori [17]

The magnetic field at the center of the arc is 4 × 10^(-4) T.

To find the answer, we need to know about the magnetic field due to a circular arc.

<h3>What's the mathematical expression of magnetic field at the center of a circular arc?</h3>
  • According to Biot savert's law, magnetic field at the center of a circular arc is
  • B=(μ₀ I/4π)× (arc/radius²)
  • As arc is given as angle × radius, so

        B=( μ₀I/4π)×(angle/radius)

<h3>What will be the magnetic field at the center of a circular arc, if the arc has current 26.9 A, radius 0.6 cm and angle 0.9 radian?</h3>

B=(μ₀ I/4π)× (0.9/0.006)

  = (10^(-7)× 26.9)× (0.9/0.006)

  = 4 × 10^(-4) T

Thus, we can conclude that the magnitude of magnetic field at the center of the circular arc is 4 × 10^(-4) T.

Learn more about the magnetic field of a circular arc here:

brainly.com/question/15259752

#SPJ4

5 0
2 years ago
Calculate the work done if a boy lifts a bag of cement 500N to the floor of a lorry 2.5m above the ground
eduard

Answer:

W = 1250 J = 1.25 KJ

Explanation:

The work done by the boy is due to the change in the position of the cement vertically. Hence, the work done in this case will be equal to the potential energy of the cement:

W = P.E\\W = mgh

where,

W = Work done = ?

mg = W = weight of cement = 500 N

h = height covered = 2.5 m

Therefore,

W = (500\ N)(2.5\ m)

<u>W = 1250 J = 1.25 KJ</u>

4 0
2 years ago
How is the structure of an atom best described?
kondor19780726 [428]
Atoms is basic particles ,electrons,neutrons and the Regions of the atom are called electron shells and contain the electrons. So “a neutral core surrounded by mostly empty space”sounds pretty sure to me :)
4 0
2 years ago
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Why are “input” and “output” good words to use when discussing systems?
charle [14.2K]

Answer:

To determine how efficient that system is.

3 0
3 years ago
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When the compound Na2S forms what happens to the Na and S ions
Mila [183]
Nothing, ATOMS lose or gain electrons to become IONS 
<span>Two Na ATOMS lose 1 electron each and 1 S ATOM gains 2 electrons </span>
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3 years ago
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