friction transforms KE into thermal energy (a)
That's why, if it goes on long enough, the moving object actually gets warm.
The correct answer is: a) friction transforms KE into thermal energy.Friction opposes motion by converting kinetic energy into thermal energy. This conversion can be observed through the generation of heat.
Friction is a force that opposes the motion of objects. It transforms the kinetic energy (KE) of an object into thermal energy.This can be observed when you rub your hands together, converting mechanical energy into heat.Thus, the correct answer is: a) friction transforms KE into thermal energy.
In 1859, Charles Darwin published the first edition of On the Origin of Species, which explained his observations of various groups of animals that showed great similarities but minor differences. Darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. This idea predicted many future biological findings and became the basis of modern biology.
Darwin’s explanation for why different species exist is best described as a(n)
law.
theory.
inquiry.
hypothesis.
Answer:
The answer is theory. Hope that's the right answer
Answer: theory.
Explanation:
A scientific theory is the detailed explanation for the cause of the natural process, or natural event or natural phenomena. The explanation is based upon detailed experimental trials and direct observation.
The Charles Darwin "On the Origin of Species" is the theory which is considered as the foundation of evolutionary biology.
What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules?
A. 75%
B. 35%
C. 25%
D. 85%
The answer is 25% because 50,000 is 25% of 200,000
The efficiency of a car's engine when given the heat input and waste heat is 50%.
Explanation:The efficiency of a car's engine can be calculated using the formula:
Efficiency = (Useful Output Energy / Input Energy) x 100%
In this case, the heat input is 200,000 joules and the waste heat is 150,000 joules. Therefore, the efficiency can be calculated as:
Efficiency = (200,000 - 150,000) / 200,000 x 100% = 50%
So, the correct answer is not provided in the options. The efficiency of the car's engine is 50%.
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Which statement is an example of the law of conservation of energy? A soccer ball eventually stops because its energy disappears. When a light bulb is turned on, electrical energy is converted to light and heat. An automobile engine burns gasoline to converts its chemical energy to electrical energy.
-- A soccer ball eventually stops because its energy disappears. No. Energy does NOT "disappear". That would exactly violate the whole concept of energy conservation.
-- When a light bulb is turned on, electrical energy is converted to light and heat. Gosh Yes ! This statement tells where the energy comes from, what happens to it, and where it goes. In a sloppy floppy way, it incorporates all of the highlights of energy conservation.
-- An automobile engine burns gasoline to converts its chemical energy to electrical energy. No. When you look closely at this statement, MOST of the energy involved is missing and unaccounted for. The statement only accounts for starting the motor and running the car radio. It completely ignores the huge amount of mechanical energy produced from the gasoline.
Answer:
No
Yes
No
Explanation:
;0 literally just did it lol
which of the statements about waves is true?
A. in longitudinal waves, particles move perpendicular to the direction the wave is traveling.
B. Both transverse and longitudinal waves can travel through water
C. Electromagnetic waves are a type of longitudinal waves.
D. In a transverse wave, particles move parallel to the direction the wave is traveling.
The true statement about waves is that both transverse and longitudinal waves can travel through water. Transverse waves oscillate perpendicularly to the wave direction, while longitudinal waves oscillate parallel to the wave direction.
The question pertains to the characteristics of different types of waves. A true statement about waves needs to accurately describe the motion of particles relative to the direction of the wave's travel.
Statement B: 'Both transverse and longitudinal waves can travel through water'. This is a true statement. Water waves are actually a combination of transverse and longitudinal waves, where the particles in water move in circular paths.
Transverse waves involve oscillations that are perpendicular to the direction the wave travels. Longitudinal waves, on the other hand, involve oscillations that are parallel to the direction of wave propagation.
a scientist plants two rows of corn for experimentation.She put fertilizer on row 1 but does not put fertilizer on row 2 both rows receive the same amount of water and light intensity she checks the growth of the corn over 5 months what is the constant in this experiment
Answer:
The Constant is the amount of water and the light intensity.
Explanation:
Answer: The constant of her experiment is water and sunlight which are necessary for photosynthesis, both factor are common to both plants
Explanation:
An object of mass 5 kilograms is moving across a surface in a straight line with a speed of 3.5 meters/second. What amount of force would be
required to keep the object in motion if you ignore the surface friction?
A.O newtons
B.17.5 newtons
C.3.5 newtons
D.5 newtons
Answer:
0 newtons
Explanation:
F =MA
because constant motion means 0 acceleration.no changein velocity
F = 5 x 0m/s²
F = 0
HOPE THIS HELPS THX
Answer: The amount of force that is required to keep the object in motion is 0 N
Explanation:
Force is defined as the push or pull on an object with some mass that causes change in its velocity.
It is also defined as the mass multiplied by the acceleration of the object.
Mathematically,
[tex]F=ma[/tex]
where,
F = force exerted on the object
m = mass of the object = 5 kg
a = acceleration of the object = [tex]0m/s^2[/tex] (Speed is constant)
Putting values in above equation, we get:
[tex]F=5kg\times 0m/s^2\\\\F=0N[/tex]
Hence, the amount of force that is required to keep the object in motion is 0 N
An object dropped from Cliff falls with a constant acceleration of 10 metre per second square find its Speed of two seconds after it was dropped
Answer:
20 meters per second
Explanation:
If an object accelerates for 2 seconds, and accelerates by 10 meters per second, then that objects speed will be 20 meters per second, assuming hat there are no other factors involved.
Answer:
20 meters per second
Explanation:
All you have to do is multiply 10 meter by the speed of two seconds which is 20 METERS PER SECOND
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The loudness of sound is the wave's ____.
Answer:amplitude
Explanation:
The name of the Sl unit for magnetic field strength, such as that created around a current-carrying wire, is the _________
pls help!!!!!
Answer: Tesla
Explanation:
Answer:
Tesla
Explanation:
Edge 2021
An unmanned spacecraft travels to Mars. Mars has a lower strength of gravity than Earth. Where in the image is the spacecraft’s weight the greatest?
The spacecraft's weight would be the greatest on Earth, where the strength of gravity is the highest.
The weight of an object is the force of gravity acting on it. Because Mars has less gravity than Earth, an object's weight on Mars would be less than its weight on Earth. As a result, the spacecraft's weight would be greatest on Earth, where gravity is strongest.
An item carried to Mars would weigh around 38% of its weight on Earth, according to. As a result, if the spacecraft weighs 1000 kg on Earth, it will only weigh 380 kg on Mars.
Thus, the weight of the spaceship would be greatest on Earth, where gravity is strongest.
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A 2.0-ohm resistor is connected in a series with a 20.0 -V battery and a three-branch parallel network with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance, what is the current in the battery? Show your work.
4.3A.
The easiest way to solve this problem is find the equivalent resistance for parallel resistor 1/Req = 1/R1 + 1/R2 + 1/R3 in the three-branch parallel network with branches whose resistance are 8Ω.
1/Req = 1/8 Ω + 1/8 Ω + 1/8 Ω
1/Req = 3/8 Ω
Req = 8/3 Ω = 2.667Ω
Req = 2.7Ω
So, the equivalent circuit will be the 20.0V battery in series with a resistor 2.0Ω and the equivalent resistor 2.7Ω.
Using Ohm's Law to find the current provide by the 20.0V voltage source:
V = I*R ------> I = V/R
I = 20.0V/(2.0Ω + 2.7Ω)
I = 20.0V/4.7Ω
I = 4.3A
A child pulls a wagon at a constant velocity along a level sidewalk. The child does this by applying a 22 newton force to the wagon handle, which is inclined at 35° to the sidewalk as shown below. What is the magnitude of the fore of friction on the wagon?
Answer:
The answer is 18 N.
Explanation:
A force can be divided into components x and y components. The component along the x-axis is called the horizontal component and along the y-axis is called the vertical component. In this case, as the force is in a horizontal direction and is also known as x-component of force. The x- component of force is
Fx = Fcosθ
Fx = 22(cos 35°)
Fx = 22 x 0.819
Fx = 18 N
Child's horizontal pull forces are equal to that of frictional resistance force on the wagon.
The force of friction on the wagon is 18 newtons, balanced by the child's horizontal force component.
To determine the magnitude of the force of friction on the wagon, we need to analyze the forces acting on the system. Because the wagon moves at a constant velocity, the net force acting on it must be zero according to Newton's First Law.
The child applies a net force of 22 newtons at an angle of 35 degrees to the horizontal. We can break this force into horizontal and vertical components:
Horizontal Component (F_horizontal): F_horizontal = 22 N * cos(35°)Vertical Component (F_vertical): F_vertical = 22 N * sin(35°)Calculating the components, we get:
F_horizontal ≈ 22 N * 0.819 = 18 NF_vertical ≈ 22 N * 0.574 = 12.6 NSince the wagon is moving at a constant velocity, the horizontal force exerted by the child (F_horizontal) must be balanced by the force of friction (f_friction).
Therefore, the magnitude of the force of friction on the wagon is 18 newtons.
The wavelength of a wave on a string is 1.2 meters. If the speed of the wave is 60 meters/second, what is its frequency? A. 0.20 hertz B. 2.0 hertz C. 50 hertz D. 10 hertz E. 15 hertz
C. 50Hz. The wavelength of a wave on a string is 1.2m with a speed of 60m/s its frecueny is 50Hz.
The wavelength of a wave describes how long the wave is, and can be represented by the formula λ = v/f, where λ is the wavelenght in meters, v is the speed of the wave in m/s, and f is the frecuency of the wave in Hertz.
The wavelength of a wave on a string is 1.2m and its speed is 60m/s, to calculate its frecuency we have to clear f from the equation λ = v/f. So:
f = v/λ
f = (60m/s)/(1.2m)
f = 50 1/s = 50Hz
Answer:
c
Explanation:
A man throws a football straight into the air. As it rises, it slows down. Which
type of energy is the football gaining?
Answer:
if it is slowing down than it is gaining potential energy
Explanation:
When can a theory be modified if a new type of technology allows for new observations that raise new questions?
A-immediately, while the questions about the theory are being asked
B-after new hypotheses related to the theory are tested in experiments
C-only after the new observations disprove all parts of the theory
D-while scientists begin to think about how the theory could improve
Answer:
id say B, but not sure
Explanation:
Answer: B-After new hypotheses related to the theory are tested in experiments.
Explanation:
A scientific theory can be define as a proposed explanation for a natural event or phenomena that is obtain after repeated experimental procedures. A scientific theory can be changed or amendments can be done in it's content with new discoveries and related evidences.
The implementation of the new technology can reduce the time to conduct the experiments and will also improve the accuracy. Therefore, a new hypothesis can be generated on the basis of the pre-proposed theory by utilizing the new technology.
Bohr found experimental evidence for his atomic model by studying
Answer:
Bohr found experimental evidence for his atomic model by studying line spectra.
Answer:
Bohr found experimental evidence for his atomic model by studying line spectra.
Line Spectra is plural of a line spectrum and a line spectrum is an emission of light, sound, or other radiation, composed of a number of discrete frequencies or energies (a spectrum).
(\) QueTooOfficial (/)Your environmental science class has collected information on the trash your school throws away. To reduce the amount of trash your school produces what should you recommend to your principal
More light is transmitted through a translucent material than through an opaque material. True or false?
true should be right if it is
True, More light is transmitted through a translucent material than through an opaque material.
Answer: A
Explanation
Depending on the ability to pass the light through the body, materials can be classified into transparent material, translucent material and opaque material.
Transparent materials are those that are able to pass most of the light hitting it. Examples are water, glass etc.
Translucent materials are able to pass some portion of light through them. Example - plastic.
Opaque materials are those in which light will not pass through. Majority of the light is reflected or absorbed. Example- wood.
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Which astronomer supported the belief that Earth was at the center of the universe, while all other planets and celestial objects orbited around it?
A) Kepler
B) Brahe
C) Ptolemy
D) Hubble
Answer:
c. Ptolemy
Explanation:
Ptolemy was the one to believe that other planets and celestial objects orbited around the earth
Hello There!
The answer to your question is C) Ptolemy
Claudius Ptolemy was famous for being a greek astronomer. He was the one who introduced the "Geocentric Theory"
Which Of the following statement is false ? A.batteries should never be stored on metal trays or outside in the Elements)B, battery acid cannot be neutralized)C.Do not stack batteries on top of each other)D.never put a damaged battery in a dumpster.
I
Answer:
B
Explanation:
Since battery acid is an acid, it can be neutralised as all acid can be neutralised.
The battery acid can be easily neutralized, and therefore the statement that it cannot be neutralized is false statement.
Answer: Option B
Explanation:
The battery acid has acidic pH that is less than 7 pH but are actually weak acids and so they have pH around 6 or 7. In order to neutralize the acid, pH is to be raised achieving the neutral pH which is 7.
This can be done using the baking soda. Baking soda has alkaline property thereby, addition of baking soda will result into neutralization reaction, causing the battery acid to neutralize.
The molecular mass of a gas is
(select all that apply)
A. independent of the type of gas
B. the same number as the atomic (or molecular) mass, but measured in grams
C. dependent on the temperature
D. the mass of a mole of the gas
Answer:
b
Explanation:
Then the mass of the gas divided by the moles will give the molar mass. Now divide g by mol to get the molar mass. Since N has a molar mass of 14 g/mol and O has a molar mass of 16 g/mol, the formula N2O would produce the correct molar mass.
what must be the same for any two resistors that are connected in series ?
a. the potntial diffrence across each
b. the rate at which charge moves through each
c. the rate at which energy is used by each
d. the resistance to the flow of charge of each
Answer:
b. the rate at which charge moves through each
Explanation:
When two resistors are connected in series, they are connected in the same branch of the circuit.
This means that the current flowing through each resistor is the same.
However, current is defined as the rate at which charges move:
[tex]I=\frac{q}{\Delta t}[/tex]
where q is the amount of charge that flows through a given point in a time interval [tex]\Delta t[/tex].
Therefore, the correct answer is
b. the rate at which charge moves through each
Answer:
b. the rate at which charge moves through each
Explanation:
What is the equivalent resistance of the circuit
Answer:
18
Explanation:
Radio waves heading upward from Earth often bounce off the
A. troposphere B. mesosphere
C. stratosphere
D. thermosphere
Answer:
Radio waves heading upward from Earth often bounce off the thermosphere-D.
With height in the thermosphere, temperature increases quickly. This layer includes the ionosphere. This layer aids in radio transmission and is really responsible for the earth's own reflection of radio waves. Thus, option D is correct.
What Radio waves heading upward from Earth?A large percentage of the free electrons in the ionosphere affect radio propagation. High-frequency (HF) radio waves induce oscillations in the free electrons of the ionosphere, which result in energy radiation back down at the same frequency. The radio wave is essentially returned to Earth in this way.
Some of the radio waves that travel from space to Earth's atmosphere are absorbed by the electrons in the ionosphere, but other waves pass through and can be seen by observers on the ground.
Therefore, radio waves heading upward from Earth often bounce off the thermosphere.
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- Po
2. Which phenomenon can be explained by both the
particle and wave models of light?
(1) photoelectric effect
(2) diffraction
(3) reflection
(4) interference
Interference is the phenomenon that can be explained by both the particle and wave models of light. It occurs when waves or particles overlap and interact.
Explanation:The phenomenon that can be explained by both the particle and wave models of light is Interference (4). In the case of wave model, interference happens when two or more waves overlap together and the resulting electric field at that location is the vector sum of the fields due to the individual waves. In the case of particle model, when light acts as a particle, the individual light particles called photons interfere or interact with each other causing the Interference phenomenon.
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Both diffraction and interference can be explained by both the particle and wave models of light.
Explanation:
Particle and Wave Models of Light:
The phenomenon that can be explained by both the particle and wave models of light is diffraction. Diffraction occurs when light waves encounter obstacles or openings that are about the same size as the wavelength of the light. It causes the light to spread out and bend around the edges of the obstacle or opening.
Interference is another phenomenon that can be explained by both the particle and wave models of light. It occurs when two or more light waves combine and their amplitudes either reinforce or cancel each other out, resulting in areas of increased or decreased brightness.
The photoelectric effect can be explained by the particle model of light, where light is treated as a stream of particles called photons. The photoelectric effect occurs when light shines on a metal surface, causing the ejection of electrons from the atoms of the metal.
Reflection can also be explained by the wave model of light. When light waves encounter a boundary between two different media, some of the light is reflected back.
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a sled of mass 8 kg slides across the ground with a friction force of 16.46 n what is μk between the sled and the ground?
a. 2.1
b. 0.49
c. 0.83
d. 0.21
D. μk = 0.21. The coefficient of kinetic friction μk is 0.21.
The key to solve this problem is using the equation of kinetic friction force Fk = μk*n, where μk is the coefficient of kinetic friction, and N is the normal force n = m*g.
Clear μk from the equation Fk = μk*n:
μk = Fk/n
With Fk = 16.46N, and n = 8kg*9.8m/s²
μk = 16.46N/(8kg*9.8m/s²)
μk = 0.21
Answer: D: .21 on apex :)
Explanation:
If the strength of the magnetic field at A is 5 units, the strength of the magnetic field at B is
SH
540 units
64 units
25 units
125 units
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Calculate the strength of the magnetic field at point B based on given data.
The strength of the magnetic field at B can be calculated using the inverse square law formula:
BB = BA * (dA/dB)2
Given BA = 5 units and dA = 1 unit, if dB = 3 units then BB = 5 * (1/3)2 = 5/9 = 0.56 units.
Therefore, the strength of the magnetic field at B is approximately 0.56 units.
Which type of bond is found between the atoms of a molecule?
A. Metallic
B. Delocalized Electron
C. Covalent
D. Ionic
Hello There!
The type of bond that is found between the atoms of a molecule is called "COVALENT" bond.
A covalent bond is where two atoms share a pair of electrons.
The bond between the atoms of molecule is Covalent bond.
Answer: Option C
Explanation:
Covalent bond due to its phenomenal activity is also known as molecular bond. The electron pairs are shared between the atoms, these shared electron pairs are known as "shared pairs or bonding pairs".
This type of covalent bonding establishes balance between the atoms against attractive and repulsive forces. Covalent bonds are more common than ionic bonds.
moral development is often defined as development of
Answer:
A sense of right and wrong.
Hi!
Let's go over the meaning of moral development before we answer.
the process thought which children develop proper attitudes and behaviors toward other people in society, based on social and cultural norms, rules, and laws.
What can we infer from this? Well, this passage tells us that moral development is a process thought.
Based on the definition, we can say that the answer would be:
A sense of right and wrong.
Does this make sense? Lmk if not!
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Which circuit has exactly two resistors connected in parallel
Answer: D
Explanation:
Option(D) is the two resistors connected in parallel.
ResistorA circuit exists simply a closed loop through which charges can continuously move. To establish that charges exist not only moving through the light bulb filament but also through the wires connecting the battery pack and the light bulb, a variation on the above activity exists completed.
A resistor exists as an electrical component that limits or restrains the flow of electrical current in an electronic circuit. Resistors can even be utilized to furnish a specific voltage for an active device such as a transistor.
A resistor exists as a passive two-terminal electrical element that implements electrical resistance as a circuit element. In electronic circuits, resistors exist used to reduce current flow, adjust signal levels, separate voltages, bias active elements, and terminate transmission lines, among other uses.
Resistors exist in parallel if their terminals are connected to identical two nodes. The equivalent overall resistance exists smaller than the smallest parallel resistor.
Here from the given options Option(D) is the two resistors connected in parallel.
It is shown below (option d).
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