Answer:
wheres the statements
Explanation:
where its incomplete
Natural selection could act on a population of proto-cells on early Earth, selecting for those that were stable and had self-replicating, catalytic RNA that allowed them to grow and divide to produce similar daughter proto-cells. The correct option is option (B).
Natural selection could act on a population of proto-cells on early Earth. Proto-cells were early, simpler forms of cells that lacked DNA but had self-replicating, catalytic RNA. Through natural selection, those proto-cells that were more stable and had RNA molecules capable of self-replication and catalytic functions would have had a reproductive advantage.
These traits would allow them to grow, divide, and produce similar daughter proto-cells. Over time, this selection process could have led to the development of more complex and stable cellular structures, eventually leading to the emergence of cells that utilize DNA as their genetic material.
Therefore the correct option is option B.
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The complete question is:
Which statement about natural selection on early Earth is correct?
A. Natural selection could only act on populations of living organisms that had DNA as their genetic material.
B. Natural selection could act on a population of proto-cells on early Earth, selecting for those that were stable and had self-replicating, catalytic RNA that allowed them to grow and divide to produce similar daughter proto-cells.
C. Natural selection acted on populations of proto-cells on early Earth in order to make them more like modern living cells that have DNA as their genetic material.
Question 5 of 10
Why does a patient receive more radiation from a CT scan than from having an X-ray image made?
A. A CT scan involves multiple X-ray images.
B. Higher-frequency rays are used in a CT scan.
C. Fewer X-rays are reflected in a CT scan.
D. The X-rays are more powerful in a CT scan.
Answer: A CT scan involves multiple X-ray images.
Answer: A CT scan involves multiple X-Ray images
Explanation:
I did it and it was correct
Reducing access to waterways will lead to an increase in human impact on waterways. please select the best answer from the choices provided t f
Answer:
F
Explanation:
Reducing access will cause less damage to occur
Answer: the answer is false
Which of the following is true about the Sun?
A.
The Sun is the only star in the Solar System.
B.
The Sun is the only star in the Milky Way.
C.
The Sun is not a star.
D.
The Sun is the only star in the universe.
A 3.00 kg bucket of water is raised with an upward acceleration of 2.20 m/s2 from a well by means of an attached rope. What is the tension in the rope
Answer:
F = M a
M = 3 kg
a = 2.2 m/s^2
T = tension in rope
T - M g = M a Where T - M g is the net force on the bucket
T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2 = 36 Newtons
The speed of sound in ice, water, and steam is shown.
A 3 column by 4 row table. Column 1 is titled Medium and includes the following entries: Ice, Water, Steam. Column 2 is titled Temperature (degrees Celsius) and includes the following entries: 0, 25, 100. Column 3 is titled Speed of Sound (meters per second) and includes the following entries: 3200 meters per second, 1500 meters per second, 346 meters per second.
What best explains the speed of sound in different states of matter?
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Sound travels slowest in steam because the sound has to move around the gas molecules that are far apart.
Sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy.
Sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.
Answer:
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Explanation:
The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
What is the effect of sound travel on ice?In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.
As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.
In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.
Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
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explain how to identify the points under compression and tension
Answer:
Pls make me brainliest
Explanation:
the compression force is the force generated from compressing an object or substance. When shearing forces are aligned into each other, they are called compression forces.
The compression force is used to power everything from compression brakes to hand tools. The compressive strength of materials and structures is an important engineering consideration.
The compression force can be visualized by placing an object on a spring. When the spring is compressed and then released, the object is ejected into the air.
This is a result of the compression force that is generated from compressing the spring.
This system has a constant velocity, and there is an equilibrium because the tension in the cable, which is pulling up the object, is equal to the weight force, i.e., mg. Where M is a mass, and g is the acceleration caused by gravity, which is pulling down the object.
The Formula of Tension.
T = Mg
Tension word becomes from a Latin word meaning “to stretch.” Testing part of the force, Like one type of pull force. All physical objects that are in contact may exert forces on each other.
This contact forces different names based on these types of objects in contact. Where one of the objects exerting the force happens to be a rope, string, chain, or cable we call the force tensions
A piece of zinc was lying outside and had a temperature of 26 degrees C. Later that day the sun came out and the temperature increased to 36 degrees C. If the piece of zinc is only 0. 15 kg, find the thermal energy. NOTE: Zinc has a specific heat of 380 J/kg degrees C). I need The Equation used and The Answer
Answer: 570 J
Explanation:
The amount of heat gained by the piece of zinc can be calulctaed using ∆Q = mc∆T
=> ∆T = 36-26 = 10°C
m = 0.15 kg, s = 380J/kg/°C
=> ∆Q = 0.15 x 380 x 10
= 570J
Write your own real-world scenario where the Pythagorean Theorem can be applied to find a missing piece. You may choose to write a problem that is two- or three-dimensional in nature. Be sure that you will be able to draw a diagram of your scenario.
Write out your problem and submit it for Part 1. Be sure to end your scenario with a question
Answer:
hey
Explanation:
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
What is Pythagoras Theorem ?Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.
Here,
The Pythagoras Theorem can be written as,
c² = b² + a²
where c is the hypotenuse, b is the base and a is the altitude of the triangle.
An example of application of the Pythagoras theorem is,
A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?
A line drawn from his current position and his initial point represents the displacement covered by the man.
Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.
Drawing a figure including all the data, we get a right angled triangle, ABC. So,
The base of the triangle, BC = 6 km
Altitude of the triangle, AB = 8 km
The displacement of the man = hypotenuse of the triangle
d = AC
According to Pythagoras Theorem,
AC² = BC² + AB²
AC² = 6² + 8² = 100
AC = √100
Therefore, displacement, d = AC = 10 km.
Hence,
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
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Attaching the image file here.
Mike is pushing a car up a ramp. What could Mike do to reduce the effort force he needs to use to push the car?
Answer:
He could use a really big pulley system or get in it and drive or call a tow truck.
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow.
[tex] \\ [/tex]
Answer:In a circuit, when the electrical resistance increases, the current decreases because it is blocking for the electrons to flow.
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How does water form in the clouds? Explain how
When air rises in the atmosphere it gets cooler and is under less pressure. When air cools, it's not able to hold all of the water vapor it once was. Air also can't hold as much water when air pressure drops. The vapor becomes small water droplets or ice crystals and a cloud is formed.
I hope this helps you..
An object with a mass of 2.0 kg accelerates 8.3 m/s? when an unknown force is applied
to it. What is the amount of the force?
Answer:
16.6 NExplanation:
We know the relation :
Force = Mass x AccelerationWe are given that :
Mass = 2.0 kgAcceleration = 8.3 m/s²Hence, on substituting the values in the equation :
F = 2.0 x 8.3F = 16.6 NThe given information is,
→ Mass = 2 kg
→ Acceleration= 8.3 m/s
→ Force = F (in Newton)
Now we have to find the,
→ Amount of force applied to the object.
Formula we use,
→ F = Mass × Acceleration
Then the amount of force will be,
→ F = Mass × Acceleration
→ F = 2 × 8.3
→ [ F = 16.6 N ]
Hence, the amount of force is 16.6 N.
THE RESPIRATORY SYSTEM - 3/3
11. The epiglottis closes when someone swallows to protect the lungs?
True or False
12. Drinking too much alcohol can cause snoring due to a relaxation in which part of the respiratory system?
uvula
epiglottis
pharynx
larynx
13. What is analogous to the structure of the respiratory system?
an upside-down deciduous tree
the solar system
the Mississippi River, delta, and the Gulf of Mexico
the archipelago of islands that make up Hawaii
14. Which type of disease is characterized by a progressive obstruction of exhalation mechanisms?
pneumonia
COPD
asthma
dyspnea
Answer:
11. true
12.
13. an upside down tree
14. copd
A sound wave, generated at a frequency of 440 hertz has a wavelength of 2.3 meters as it travels through a solid material. The approximate speed of the wave is ____ m/sec.
The approximate speed of the sound wave traveling through the solid material is 1012m/s.
Wavelength, Frequency and SpeedWavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
From the wavelength, frequency and speed relation,
λ = v ÷ f
Where λ is wavelength, v is velocity/speed and f is frequency.
Given the data in the question;
Frequency of sound wave f = 440Hz = 440s⁻¹Wavelength of the wave λ = 2.3mSpeed of the wave v = ?To determine the approximate speed of the wave, we substitute our given values into the expression above.
λ = v ÷ f
2.3m = v ÷ 440s⁻¹
v = 2.3m × 440s⁻¹
v = 1012ms⁻¹
v = 1012m/s
Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.
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. A marble sphere with a diameter of 1/4 inch is fully immersed in the oil of density 0.961 g/cm3 . Calculate the buoyant force exerted on the marble sphere by the oil.
Answer:
See below ( was it REALLY 1/4 INCH??)
Explanation:
Calculate the volume of the sphere
v = 4/3 pi r^3
this times the density of the oil will give g displacement
then f = ma
4/3 pi (.25 in * 2.54 cm/inch) ^3 * .961 = 1.0307 gm
1.0307 gm is .0010307 kg
f = ma = .0010307 * 9.8 = .0101 N
How is "one second time" defined in SI system?
Answer:
Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
This definition refers to a caesium atom at rest at a temperature of 0 K
Explanation:
Which of the four numbered galaxies have ongoing star formation?.
The image here is not found here but star formation is characterized by clouds of dust where stars are born.
What is star formation?Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.
Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).
Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.
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A pebble of mass 50g is moving with a velocity of 20m/s.What is its kinetic energy?
[tex] \bf\sf \underline{Given: - }[/tex]
[tex] \text{Mass of pebble= 50g}[/tex][tex] \text{Velocity of pebble= 20m/s}[/tex][tex] \bf\sf \underline{To \: Find: - }[/tex]
[tex] \text{Kinetic Energy of Pebble}[/tex][tex] \bf\sf \underline{Solution: - }[/tex]
We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,
1g = 0.001kg,
⠀⠀⠀50g = 0.05g
Now we know the formula of Kinetic energy,
[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]
Hence, the kinetic energy of the pebble is 10J.
Which layer of the sun is where plasma rises and sinks due to temperature differences?.
Answer:
Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.
Explanation:
A 160 kg cart has a momentum of 870 kg m/s. What is the velocity of the cart?
Answer: 5.44 m/s
Explanation:
Given:
Mass of cart: 160 kg
Momentum of cart: 870 kg•m/s
[tex]$$Momentum $|\rho|=m \times v$$$\begin{aligned}&870 \ kg\cdot m/s=160 \mathrm{~kg} \times v \\&v=5.44 \mathrm{~m} / \mathrm{s}\end{aligned}$$[/tex]
Answer:
The momentum is defined as :
P=mv
Where m is the mass and v is the velocity. In this case we know the mass is 160 kg and the momentum is 870 kg plugging in this equation above and solving for the velocity we have
870=160V
V=870÷160
V=5.44
Therefore, the velocity of the cart is 5.44 m/s.
Why do planets like Jupiter and Saturn have large gas atmospheres while Mercury and Mars do not?
options:
Because Jupiter and Saturn have more mass
Because of each planets distance from the Sun
Because of their different orbits around the Sun
Because they were formed at different times
The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.
Explanation:
Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.
A spacecraft flies within 500,000 km of each of these planets. Based on its mass, which planet would gravitationally attract the spacecraft the least?
Answer:
Mars
Explanation:
It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.
I hope it helps! Have a great day!
Anygays-
True or False : If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
Answer:
Your answer would be:
B.) False
If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.
Explanation:
Have a great rest of your day
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Angie, brad, and carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. All the masses and speeds are the same, says angie, so i think the blocks will have equal speeds after the collisions. But what about momentum? asks brad. The bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block. I think the bounce is an important factor, replies carlos. The steel block will be faster because the bullet bounces off it and goes back the other direction.
Answer:
Momentum must be conserved in the collision.
The steel block must move faster after the collision to preserve momentum.
If the steel block is moving faster it will aso have more kinetic energy.
(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)
Which statement is true about the reaction shown by this chemical equation?
HCI + NaOH – NaCl + H20
O A. It is exothermic.
O B. It is a synthesis reaction.
O C. It is endothermic.
D. It is a combustion reaction.
SUBMIT
The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.
What is an exothermic reaction?In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.
The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.
From the given reaction,
HCl + NaOH --- NaCl + H₂O
HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.
When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.
When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.
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Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m from the central image using a diffraction grating constant of 4.9 x 10-5 m. How far is the screen from the slits? SHOW ALL WORK
For Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m the distance of the screen from the slits is mathematically given as
D = 26m
How far is the screen from the slits?
Generally, the equation for the small-angle approximation is mathematically given as
x = n(Landa)D/d
therefore,
D = 0.10x4.9 x 10-5/(3x630 x 10-9)
D = 26m
In conclusion, the distance of the screen from the slits is
D = 26m
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is it possible to put negative and positive charge at same time at electroscope leaves?
Answer:
No
Explanation:
If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together
Question 20 I need help ASAP!!
Answer:
1.) Gas = Are the particles moving quickly in a radom pattern?
2.) Plasma = Are the particles electrically charged?
3.) Solid = Are the particles vibrating in a fixed position?
4.) Liquid = Are the particles sliding past each other?
Hope this helps!
Which of the following processes is more easily observable for light with a short wavelength?
help please.
Answer:
Option B
Explanation:
Option B
Answer is PHOTOELECTRIC EFFECT
what would happen in a capacitor if the dielectric was not made out of an insulator
[tex]
\mathbb \blue{Answer }[/tex]
[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]
[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]
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