The work done by the heart in pumping blood during a lifetime is approximately 1.23 x 10^9 joules.
We can start by calculating the number of heartbeats during a lifetime.
Number of heartbeats in a year:
67 beats/minute x 60 minutes/hour x 24 hours/day x 365 days/year = 3,717,600 beats/year
Number of heartbeats in 71 years:
3,717,600 beats/year x 71 years = 263,385,600 beats/lifetime
The work done by the heart during each heartbeat is given as 1.0 J.
Therefore, the total work done by the heart in pumping blood during a lifetime is:
1.0 J/heartbeat x 263,385,600 beats/lifetime = 263,385,600 J
We can express this in scientific notation as 2.633856 x 10^8 J.
However, we are asked to express our answer with appropriate units. The SI unit for energy is the joule, but for larger values, we often use the unit kilojoule (kJ) or megajoule (MJ).
Therefore, the work done by the heart in pumping blood during a lifetime is approximately 1.23 GJ (gigajoules), which we can convert to MJ by multiplying by 10^6:
1.23 x 10^9 J = 1.23 x 10^3 MJ
The heart does about 1.23 x 10^9 joules of work in pumping blood during a lifetime, which is equivalent to 1.23 x 10^3 megajoules (MJ).
To know more about heartbeat, visit;
https://brainly.com/question/1395397
#SPJ11
A object is placed between the focal point and the lens of a concave lens. Where will the image be formed?
Answer:
When object is placed between convex lens and focal point, image formed is virtual and magnified which is shown in the diagram. Was this answer helpful?
Which is the best estimate for the mass of a typical lineman on a high school football team
1. 100,000 g
2. 100,000 kg
3. 100,000 mg
We have that the best estimate for the mass of a typical lineman on a high school football team is
\(100,000 g=100kg\)
From the options
1. 100,000 g
2. 100,000 kg
3. 100,000 mg
Generally
A Typical lineman cannot be as small as
\(100000mg=0.1kg=100g\)
A Typical linesman cannot be as massive as
\(100,000kg\) as that is unrealistic
With the Average Mass of A Typical linesman can be
\(100,000 g=100kg\)
In conclusion
The best estimate for the mass of a typical lineman on a high school football team is
\(100,000 g=100kg\)
For more information on this visit
https://brainly.com/question/10069252
Two pulses are moving along a string. one pulse is moving to the right and the second is moving to the left. both pulses reach point p at the same instant. an illustration with a rectangular crest moving toward the right and a triangular trough going toward the left both toward point p and equidistant from p. which diagram shows the appearance of the string after the pulses pass point p? an illustration with the triangular trough in the middle of the rectangular crest to the left of point p. an illustration with the triangular trough in the middle of the rectangular crest to the right of point p. an illustration with a rectangular crest moving toward the right past p and a triangular trough going toward the left past p. an illustration with a rectangular crest moving toward the left and a triangular trough going toward the right both away from point p and equidistant from p.
The two pulses will have Constructive interference. Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes.
What is constructive interference?
Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes. Equivalently, the minima of the waves would be aligned
This is an example of a standing wave produced when two ends of a string are oscillated in the same plane. The displacement of of point on two ends oscillates vertically.
We are given that two pulses move along the string each coming towards each other and meet at a common point ( P ).
Each pulse have their own magnitude or displacement in the vertical plane. If the pulses are to meet at a common point at the same instant, then they interfere with each other constructively.
Where constructive interference of two pulses is the addition of magnitudes of induvidual pulses and form a single puls of the constructed magnitude.
magnitude ( New pulse ) = magnitude (Pulse 1) + magnitude (Pulse 2)
Hence the two pulses will have Constructive interference
To know more about Constructive interference follow
https://brainly.com/question/1040831
Answer:
C
Explanation:
edge 22
Part D
From this data, how many male, female, adult, and baby mountain goats do you predict are in the park?
Answer:
80
Explanation:
I literally just did this question lol I hope I helped
In an ecosystem having a park, from the given data there are 71 male,93 female, 103 adults and 61 baby goats in the park.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/1673533
#SPJ2
A wave has a wavelength of 3 m and a frequency of 340 Hz. How far will the wave go in 20 s?
True or false. A solvent is the part of a solution that dissolves the solute
Answer:
True
Explanation:
I'm not exactly sure on this , but A solution is made up of two components. Namely,
1. The solvent
2. The solute
The solute has a lower percentage in the solution while the solvent has a higher percentage in the solution so yes, the solvent is used to dissolve the solute
consider two identical pails of water filled to the brim. one pail contains only water, the other has a piece of wood floating in it. which pail has the greater weight?
When two identical pails of water filled to the brim. one pail contains only water, the other has a piece of wood floating in it. Wood pail has the greater weight due to Archimedes' principle.
Considering only a certain amount of content can fit in each bucket. A bucket containing heavy material will weigh more. The amount of water in the bucket will be greater than it actually is because of the ball, hence the bucket with the ball will hold less water while the bucket without the ball will hold more.
The upward buoyant force that is applied to a body submerged in a fluid, whether wholly or partially, is equal to the weight of the fluid that the body displaces, according to Archimedes' principle (sometimes spelled Archimedes' principle). The Archimedes' principle is a fundamental physical law in fluid mechanics. It was created by Syracuse's Archimedes.
To know more about pails of water
https://brainly.com/question/486161
#SPJ4
What is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track?.
the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track is `sqrt(gr)`.
It is given as
`v=sqrt(gr)`
where v is the velocity of the block at the top of the loop, g is the acceleration due to gravity, and r is the radius of the loop.
However, the minimum speed is the one that makes the net force acting on the block to be equal to the centripetal force. At the top of the loop, the gravitational force on the block is acting downwards while the normal force on the block is acting upwards.
So the net force on the block is the difference between the two forces. This is given by:
Net force = gravitational force - normal force
`F_net = m*g - m*(v^2)/r
`Since the block is moving in a circle, the net force must be equal to the centripetal force.
That is,
`F_net = m*a_c
`where `a_c` is the centripetal acceleration. The centripetal acceleration is given by:
`a_c = v^2/r
`So we can substitute this expression for `a_c` into the equation for
`F_net`: m*(v^2)/r
= m*g - m*(v^2)/r2m*(v^2)/r
= m*gm*(v^2)/r
= mgr(v^2)
= grv = sqrt(gr)
Therefore, the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track is `sqrt(gr)`.
learn more about speed here
https://brainly.com/question/13943409
#SPJ11
describe two effects of weathering on a cliff
Answer:
In coastal areas, strong winds and powerful waves break off soft or grainy rocks from hardier rocks. Too much weathering occurs, it might break off parts of the cliff and be dangerous to humans, or animals.
Rain has acid in it which could eat up the cliff.
Explanation:
Find the magnetic field a distance rrr from the center of a long wire that has radius aaa and carries a uniform current per unit area jjj in the positive z direction.
The magnetic field is \(\vec B = \frac{\mu_0 jR^2}{2r}\hat \theta\).
What is Magnetic Field?The area in which the force of magnetism works around a magnetic substance or a moving electric charge is known as the magnetic field. a diagram that shows the magnetic field and how a magnetic force is distributed within and outside of a magnetic substance.
a) the magnetic field, B outside the wire
Using ampere law:
\(\int Bdl = \mu_0 I_{net}\)
so:
\(B(2\pi r) = \mu_0 (jA) = \mu_0 j(\pi R^2)\)
\(B = \frac{\mu_0 jR^2}{2r}\\\)
the direction is in\(\hat \theta\)
\(\vec B = \frac{\mu_0 jR^2}{2r}\hat \theta\)
b) the magnetic field, B inside the wire
Using ampere law:
\(\int Bdl = \mu_0 I_{net}\)
so:
\(B(2\pi r) = \mu_0 (jA) = \mu_0 j(\pi r^2)\)
\(B = \frac{\mu_0 jr}{2}\)
the direction is in\(\hat \theta\)
\(\vec B = \frac{\mu_0 jr}{2}\hat \theta\)
to learn more about magnetic field go to - https://brainly.com/question/7802337
#SPJ4
Rank the following according to the wavelength of radiant energy each emits, from the shortest wavelength to the longest: A light bulb with a filament glowing at 4000°C
A rock at room temperature
A car engine at 140°C
Ranking from shortest to longest wavelength of radiant energy emitted: A light bulb with a filament glowing at 4000°C, a car engine at 140°C, and a rock at room temperature.
Ranking the following according to the wavelength of radiant energy emitted, from the shortest wavelength to the longest:
The shortest wavelength:
1. A light bulb with a filament glowing at 4000°C
A light bulb with a filament glowing at 4000°C emits visible light, which corresponds to a range of wavelengths in the electromagnetic spectrum.
As the temperature increases, the filament emits shorter-wavelength visible light, including blues and violets, which have relatively shorter wavelengths compared to other sources.
2. A car engine at 140°C
A car engine at 140°C emits thermal radiation in the infrared region of the electromagnetic spectrum. Infrared radiation has longer wavelengths than visible light. While the exact spectrum of an engine's thermal radiation depends on various factors, the emitted wavelengths are generally longer than those emitted by a glowing filament in a light bulb.
The longest wavelength:
3. A rock at room temperature
A rock at room temperature primarily emits thermal radiation in the far-infrared range, commonly referred to as "heat radiation."
The wavelengths of this radiation are longer than both visible light and the infrared radiation emitted by a car engine. As a result, the rock's thermal radiation has the longest wavelengths among the three sources listed.
In summary, the ranking from shortest to longest wavelength of radiant energy emitted is: A light bulb with a filament glowing at 4000°C, a car engine at 140°C, and a rock at room temperature.
Learn more about wavelength:
https://brainly.com/question/10750459
#SPJ11
Science Unit 3 Study Guide/Sample Work
class kick
Answer:
what??!?!? the question is unclear, what exactly are you asking?
Answer:
maybe if there is an image you want to post i could help you? this is unclear. But that's okay, hope your having an okay day :)
Explanation:
when the speed (assumed to be much less than the speed of light) of a particle doubles, its momentum doubles, and its kinetic energy becomes four times greater. when the momentum of a photon doubles, does its energy become four times greater? provide a reason for your answer. cj7 29.cq.009
A photon's energy does not increase four times when its momentum doubles because a photon's kinetic energy is inversely correlated with its frequency.
What is a photon?A photon is a quantum of the electromagnetic field and an elementary particle. It is also referred to as light particle or electromagnetic wave. As a result of its dual nature, the photon behaves as both a particle and a wave. It travels at the speed of light, and it has momentum and energy. Photons are the basic units of light and other types of electromagnetic radiation.The momentum of a photon is given by p = hf/c, where h is Planck's constant, the photon's frequency is f, and the speed of light is c.
As a result, a photon's frequency and wavelength also double when its momentum does. Nevertheless, rather than its momentum, its kinetic energy is related to its frequency. Hence, a photon's energy increases by two, not four, times, when its momentum doubles. E = hf, where h is Planck's constant and f is the photon's frequency, calculates the energy of a photon.
Hence, instead of doubling in size when the photon's frequency doubles, its energy increases by a factor of four instead.
To know more about photon click on below link :
https://brainly.com/question/20912241
#SPJ11
13. a 10.0 -g bullet is fired into, and embeds itself in, a 2.00 -kg block attached to a spring with a force constant of 19.6 n/m and having negligible mass. how far is the spring compressed if the bullet has a speed of 300. m/s just before it strikes the block and the block slides on a frictionless surface? note: you must use conservation of momentum in this problem because of the inelastic collision between the bullet and block.
The spring is compressed by 0.626 m.
Since momentum is conserved in the inelastic collision between the bullet and block, we can write:
m_bullet * v_bullet = (m_bullet + m_block) * v_combined
where m_bullet is the mass of the bullet, v_bullet is its initial velocity, m_block is the mass of the block, and v_combined is the velocity of the combined bullet and block immediately after the collision.
Solving for v_combined, we get:
v_combined = m_bullet * v_bullet / (m_bullet + m_block)
= (0.01 kg) * (300 m/s) / (0.01 kg + 2.00 kg)
= 2.96 m/s
The combined bullet-block system then compresses the spring until the block momentarily stops. At this point, all of the kinetic energy of the bullet-block system has been converted into elastic potential energy stored in the spring.
We can use the equation for elastic potential energy to find the compression of the spring:
(1/2) * k * x² = (1/2) * m_block * v_combined²
where k is the spring constant and x is the compression of the spring.
Solving for x, we get:
x = √((m_block * v_combined²) / k)
= √((2.00 kg) * (2.96 m/s)² / (19.6 N/m))
= 0.626 m
To know more about spring, here
brainly.com/question/16949739
#SPJ4
kepler's third law for objects in the earth's orbit is given by the following equation, where t is the period of the satellite, g the universal gravitational constant, me the mass of the earth, and r the radius of the satellite's orbit that we found above. t2
Kepler's Third Law for objects in Earth's orbit can be expressed using the equation T^2 = 4π^2R^3 / (GM_E), where T is the period of the satellite, G is the universal gravitational constant, M_E is the mass of the Earth, and R is the radius of the satellite's orbit.
Kepler's third law states that the square of the period of an object in orbit around a central body is proportional to the cube of the semi-major axis of its orbit. In the case of a satellite in Earth's orbit, the equation is given by t^2 = (4π^2/ GM) × r^3, where G is the universal gravitational constant, M is the mass of the central body (in this case, the Earth), and r is the radius of the satellite's orbit. This law allows us to calculate the period of the satellite's orbit based on its distance from the Earth, and vice versa. It also tells us that objects farther from the Earth will take longer to complete one orbit than those closer to it. Kepler's laws of planetary motion revolutionized our understanding of the solar system and helped lay the foundation for modern astronomy.
To know more about Earth's orbit visit :-
https://brainly.com/question/32021664
#SPJ11
In your own words, describe how an object's potential energy can be affected by its position.
Answer:
Explanation:
The higher the object is relative to some defined baseline (like the ground), the greater the potential energy.
Potential Energy = U = mgh
U is directly proportional to h (height of the object), so the greater the h the greater the U.
language development has its most rapid and important advances during __________. infancy toddlerhood early childhood adolescence
Language development has its most rapid and important advances during early childhood. Option c is correct.
Language development has its most rapid and important advances during early childhood, which is typically defined as the period from ages 2 to 6 years. During this time, children's language abilities undergo significant changes as they acquire vocabulary, grammar, and communication skills. Children start to use complex sentence structures, understand abstract concepts, and engage in social communication with peers and adults.
The development of language during this period is crucial, as it lays the foundation for success in later academic and social contexts. Early childhood language development is influenced by both environmental and genetic factors, and caregivers and educators can play a key role in supporting and promoting language skills during this time. Hence, option c is correct.
To know more about childhood, here
brainly.com/question/29924887
#SPJ4
If a dancer's breathing is deep and rapid after performing a folk dance,what is the intensity of his activity?
Answer:
Moderately Light
Explanation:
Dancer breathing deeply and rapid after performing a folk dance is moderately light kind of activity intensity.
Other examples of moderately intense exercise include brisk walking, hiking, playing tennis, pushing a lawn mover and water aerobics.
Moderately Intensity activities are those which allow you to move quickly or hard enough to consume three to six times more energy every minute than when you sit still.
The activity in which the performer of the folk music is involved is a moderately intense activity.
A folk dance is an activity in which the performer moves briskly and moves the body rapidly. It is a mildly vigorous activity hence the breathing rate of the performer increases slightly.
Hence, we can say that the activity in which the performer of the folk music is involved is a moderately intense activity.
Learn more about activities:https://brainly.com/question/1195122
The difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500 millibars and the existing temperature at 500 millibars is called the
The difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500 millibars and the existing temperature at 500 millibars is called the Lapse rate.
The lapse rate is the rate of decrease of an atmospheric variable with height. It is often applied to the temperature, but can also be used for humidity and pressure. The term arises from the word lapse in the sense of a gradual change.Lapse rates are very important in determining various things like atmospheric stability, clouds formation, and atmospheric mixing. The most important lapse rates are the adiabatic lapse rate, the dry adiabatic lapse rate, the wet adiabatic lapse rate, and the environmental lapse rate.
The environmental lapse rate (ELR) is the rate of decrease of air temperature with height as measured by a thermometer carried by an ascending balloon. It varies from day to day and place to place. It is often expressed in degrees Celsius per kilometer (°C/km) or in degrees Fahrenheit per thousand feet (°F/1000 ft). So therefore lapse rate is Tthe difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500 millibars and the existing temperature at 500 millibars
Learn more about Lapse rate at
https://brainly.com/question/22257655
#SPJ11
c) The school is 1 km away from a teacher's house. A teacher driving to the school has an
acceleration of 20 m/s2. When starting from rest, what would be the distance travelled in 10
seconds? How much more distance does the teacher have to travel to reach the school?
The teacher has traveled a distance of 1000 meters, which is equal to the distance to the school (1 km = 1000 meters), there is no more distance left to reach the school. The teacher has arrived at the school.
To calculate the distance traveled by the teacher in 10 seconds, we can use the equation of motion:
s = ut + 1/2at^2
where s is the distance traveled, u is the initial velocity (which is 0 since the teacher starts from rest), a is the acceleration, and t is the time.
Given:
u = 0 m/s (starting from rest)
a = 20 m/s^2 (acceleration)
t = 10 s (time)
Substituting the values into the equation:
s = (0)(10) + 1/2(20)(10)^2
s = 0 + 1/2(20)(100)
s = 0 + 1/2(2000)
s = 0 + 1000
s = 1000 meters
Therefore, the teacher would have traveled 1000 meters in 10 seconds.
To determine the remaining distance to reach the school, we subtract the distance traveled from the total distance:
Remaining distance = Total distance - Distance traveled
Remaining distance = 1000 meters - 1000 meters
Remaining distance = 0 meters
for such more questions distance
https://brainly.com/question/26550516
#SPJ11
Find the frequency of the 5th harmonic (h5) of a 5 hz fundamental
The frequency of the 5th harmonic of a 5 Hz fundamental is 25 Hz.
To find the frequency of the 5th harmonic (h₅) of a 5 Hz fundamental, you need to multiply the fundamental frequency (f₁) by the harmonic number (n). The formula is:
fₙ = n*f₁
where:
fₙ = frequency of the nth harmonic
f₁ = fundamental frequency
n = harmonic number
In this case, the fundamental frequency (f₁) is 5 Hz and the harmonic number (n) is 5. So, the frequency of the 5th harmonic (h₅) would be:
h₅ = 5 * 5
= 25 Hz
To know more about frequency, here
brainly.com/question/5102661
#SPJ4
When setting your schedule, it is sometimes necessary to tell people "No." Please select the best answer from the choices provided. t or f
Answer:
True Edg2020
Explanation:
Answer: true
Explanation:
because I say so :P
The disadvantages of _____ telescopes include chromatic aberration and longer size.
The disadvantages of refractive telescopes include chromatic aberration and longer size.
This was the telescope developed by Newton in 1668.It is the simplest type of telescope which has a tube with lenses on both ends. The light enters through the lens on the farther end of telescope. The light is refracted to a point near the lens on the near end. It is then then further magnified when seen through the lens on the eyepiece.
Even though it was more reliable, it was really heavy and had a larger aperture and longer body. Since high quality lenses were costly to make, cheaper lenses were used mostly. So there was chromatic aberration.
Therefore, the disadvantages of refractive telescopes include chromatic aberration and longer size.
To know more about Telescopes
https://brainly.com/question/556195
#SPJ1
A train is resting on a track when another train with several more cars bumps it and causes it to move forward 10 meters. This is an example of acceleration because:
Answer:
The answer is below
Explanation:
Acceleration is the rate of change of velocity with respect to time. The S.I unit of acceleration is m/s².
We say that there is acceleration if there is a change of distance or change in velocity (increase or decrease) or both.
The statement above is an example of acceleration because there is a change in velocity. The velocity when the motor was at rest was 0, but an increase in acceleration caused the train to move a distance of 10 meters.
For each method - sometimes used a s heuristic, what is the distance from start to end? (ignore any coloring in the boxes)
Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position.
What is the Manhattan distance heuristic?Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position. The obvious option for a heuristic function is the Euclidean (straight-line) distance, which, as far as we are aware, can never underestimate the distance but might do so if there is a target obstacle to avoid on the way there.
Any problem-solving strategy that employs a practical approach or numerous short cuts in order to provide answers that might not be ideal but are adequate given a constrained timeline or deadline is known as a heuristic, or heuristic technique.
To learn more about heuristic technique refer to:
https://brainly.com/question/14789144
#SPJ4
what does it mean mechanical advange is less than one?
Answer:
this happens when the input force is greater than the output force
HOPE IT HELPED YOU...
a wave having a wavelength of 4.7 meters and an amplitude of 2.5 meters travels a distance of 28 meters in 7 seconds. determine the frequency and period of the wave
Answer:
T(Period) = 1.33sf(Frequency) = 0.75Hz (cycles/second)Explanation:
Given:λ = 4.0mAmplitude = 25md = 24ms = 8.0sRequired:f = ?T = ?Analysis:v = λff =N/tT = 1/fv = d/tSolve:v = d/t = 24/8.0 → v = 3.0m/sv =λf → f = v/λ = 3.0/4.0 → f = 0.75HzT = 1/f = 1/0.75 → T = 1.33sHopes this helps. Mark as brainlest plz!How do the sperm cells of nonvascular plants reach the egg cells during reproduction?
A.) The sperm cells are forcefully ejected from their capsules to hit the egg cells.
B.) The sperm cells are blown by the wind and land on the egg cells.
C.) The sperm cells swim to the egg cells through their watery surroundings.
Answer:
C.) The sperm cells swim to the egg cells through their watery surroundings.
A new ski area has opened that emphasizes the extreme nature of the skiing possible on its slopes. Suppose an ad intones "Free-fall skydiving is the greatest rush you can experience . . . but we’ll take you as close as you can get on land. When you tip your skis down the slope of our steepest runs, you can accelerate at up to 75% of the acceleration you’d experience in free fall." What angle slope could give such an acceleration?
Answer:
48.6°
Explanation:
The forward force, F equals the component of the weight along the slope.
So mgsinθ = ma where a = acceleration and θ = angle between the slope and the horizontal.
So a = gsinθ
Since we are given that a = 75%g = 0.75g,
0.75g = gsinθ
sinθ = 0.75
θ = sin⁻¹(0.75)
= 48.6°
which force binds stars together to form galaxy? * 1 point a) gravitational attractive force b) strong nuclear force c) electrical force d) centripetal force e) none of these
Option A is correct. The force that holds all the elements of the galaxy together is gravity, which is a feature of matter because of its mass.
The unifying force of the universe is inertia. Literally. Without it, matter would not possess the electric forces required to create its current configuration. The heat and kinetic energy created by moving particles work to resist inertia. There are four basic forces of nature, which you may recall if you recall any of the physics you learnt in school. Gravity, electromagnetism, the weak nuclear force, and the strong nuclear force are listed in no particular order.
Learn more about force here-
https://brainly.com/question/13191643
#SPJ4
Answer: A is the proper answer. Gravity, which is a property of matter due to its mass, is the force that keeps every component of the galaxy together.
Explanation: Inertia is the driving force of the cosmos.
Without it, the matter wouldn't have the electric forces necessary to shape its existing structure.
Moving particles provide heat and kinetic energy, which operate to counteract inertia.
There are four basic forces of nature,
the following are listed: gravity, electromagnetism, weak nuclear force, and strong nuclear force.
To know more about Force click here
brainly.com/question/13191643
#1234