Newton´s second law of motion
Final answer:
The reason a school bus full of kids takes longer to stop than a small car can be attributed to Newton's Second Law of Motion and the fact that kinetic energy increases with the square of the speed, requiring more work to stop a more massive vehicle like a school bus.
Explanation:
The phenomenon where a school bus full of kids takes longer to stop than a small car can be explained by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. The more mass an object has, like a school bus with children, the more force is needed for it to change its state of motion. When stopping, the required force translates to the braking force, which must overcome the kinetic energy of the vehicle. Since kinetic energy increases with the square of the speed, and because a school bus has a greater mass, it has significantly more kinetic energy than a small car at the same speed. This results in a longer stopping distance for the school bus, as the brakes need to do more work to reduce its kinetic energy to zero.
Harry and Cassie wanted to conduct an experiment to see how many licks it takes to get to the center of a tootsie roll pop. Below is their procedure and above are the results.
1. Obtain test subject. 2. Obtain unwrapped tootsie roll pop. 3. Test subject places tootsie roll pop in center of tongue and drags it to the tip. This is considered one lick. 4. Test subject swallows. 5. Before licking again, the test subject rotates the tootsie roll pop slightly with each new lick to make sure that the entire pop obtains adequate licking surface area. 6. Test subject licks while keeping track of all licks until the tootsie roll is encountered. What is wrong with this experiment?
Hey there!
The answer is that The data was not reliable because there was not any repetition.
An experiment should be completed multiple times to be sure of accurate results.
A screenshot is attached.
Hope this helps! :)
Answer:
Actually, Kaylene M., the correct answer was D. You know:"The data is not reliable because there was not any repetition." The answer you have "screenshoted" I got the question wrong because of you. Thanks a lot.
Explanation:
Which of these is a chemical property of a substance
Density color reactivity or melting point
Question:
Which of these is a chemical property of a substance?
A) Density
B) Color
C) reactivity
D) melting point
Answer:
C) Reactivity
Explanation:
We identify Reactivity as a chemical property because it dose Change to the chemical nature of matter such as change the way why the earth looks. One example of Reactivity is when we have earthquakes. But Things like Density, Melting point and color are signs of Physical properties because they do not change the chemical nature of matter.
The answer would be reactivity
According to the cooling curve, what is the approximate freezing point of the substance?
The freezing point of a substance in a cooling curve can be determined at the temperature where the substance transitions from its liquid phase to its solid phase. The freezing point may, however, be depressed in the presence of solutes. Freezing point depression is one of the colligative properties that depend on the quantity of solute particles rather than their identity.
Explanation:The freezing point of a substance in a cooling curve can be determined at the point where the substance begins to transition from its liquid phase to its solid phase. The freezing point represented on the cooling curve is the temperature at which this phase transition occurs. For instance, pure water freezes at 0 °C (32 °F) under normal atmospheric pressure.
In some cases, this freezing point may vary, e.g., the freezing point of benzene is 5.5 °C. For a solution, the freezing point might be lower due to the presence of solutes; this is known as the freezing point depression. In other words, substances such as salt or sugar when mixed with water lower its freezing point, a concept used in daily life, such as making homemade ice cream or de-icing roads in winter.
For example, a solution of benzene and HCl showed a freezing point depression (ΔTf) of 5.1 °C, implying that the freezing point of the solution was lower than the pure solvent. Therefore, the freezing point of a substance can be approximated using cooling curves, considering other properties such as pressure and presence of solutes.
https://brainly.com/question/31357864
#SPJ3
Is the planet Jupiter magnetic.
Yes or no
Yes! The Planet Jupiter is Magnetic
Answer: yes
Explanation:
It is surrounded by a giant magnetic field called the megnetophere
Which kind of energy is greater? Potential or kinetic energy?
Answer: it depends potential energy is the build up of kinetic energy like going to the top of a roller coaster. kintic is the use of the potential energy like going down the roller coaster so depends how much energy one another give :)
Hope this helps you out :)
Answer:
Explanation:
The question has no set meaning. Suppose you take a rock to the top of a building. You put the rock over the edge of the building. You don't drop it yet. The potential energy is greatest for the rock under this condition. The kinetic energy is 0 because the rock is not moving.
Now you let the rock go. As it falls, it looses distance to the ground which means that the Potential energy is nearing 0. The Kinetic energy is picking up because the rock is moving faster.
At the bottom of the rock's journey just before it hits the ground, the KE is at a maximum and the PE is nearly 0.
(please answer fast)
In which layer of a rock would the oldest fossils, such as this one, be found?
A) lowermost
B) middle
C) stratosphere
D) uppermost
Answer:
Lowest
Explanation:
Law of superposition
The correct answer is A) lowermost.
The principle of superposition states that in an undisturbed sequence of sedimentary rocks, each layer is younger than the one below it and older than the one above it.
This means that the oldest fossils would be found in the lowermost layer of sedimentary rock, as it was deposited first. Over time, newer layers of sediment accumulate on top, preserving the older layers and the fossils they contain.
Therefore, the oldest fossils would be located in the oldest layer, which is the lowermost one. Options B, C, and D would contain progressively younger fossils, with the uppermost layer containing the youngest fossils.
The stratosphere (option C) is not a layer of rock but rather a layer of Earth's atmosphere, making it an incorrect choice for finding fossils."
which factors allow for life on Earth
Are there supposed to be multiple choices for this question?
Answer: water some food ALOT of FUNNN!!! and you'll live you also need the big guy up there
^
A device that uses the wet/dry bulb method to measure the ___________________is the sling psychrometer. As seen here, two thermometers are attached to a handle or length of rope and then are spun around in the air for a few minutes.
A) air currents
B) air temperature
C) light intensity
D) relative humidity
I would say the answer is D
A hygrometer is an instrument used to measure relative humidity. ... To determine the relative humidity, the temperatures are taken from the dry-bulb thermometer and the temperature difference between the wet and dry bulb thermometers.
hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer.
The correct answer is D) relative humidity, and a sling psychrometer measures this by comparing the temperatures obtained from a wet and a dry thermometer.
A device that uses the wet/dry bulb method to measure the relative humidity is the sling psychrometer. This device consists of two thermometers, with one being the dry bulb and the other being the wet bulb. The difference in temperature readings between these two allows individuals to determine the relative humidity using a psychrometric chart, which requires a knowledge of the temperature at which air becomes saturated with water vapor (dew point) as well as other related properties of moist air.
The wet-bulb temperature is particularly important in industries such as textile, wood, and chemical processing, where humidity control is crucial. With the use of a psychrometric chart, these measurements enable precise control over the environmental conditions in plant production facilities and other industrial processes.
Why do solar cells need an inverter?
Answer:
Because solar cell produces DC (Direct current) electricity.
Explanation:
Most of the appliances and the electricity grid works on the Alternating Current (AC) electricity. The solar cells produces DC which are not usable until that is converted into AC. For this purpose inverters are used which convert the DC to AC and thus making Solar energy usable for home appliances.
An inverter is necessary in a solar power system to convert the DC electricity produced by the solar panels into the AC electricity required for most electrical applications. Therefore solar cells need an inverter because their energy output is alternating current. Option A is the answer.
Why solar cells need invertersSolar cells, or photovoltaic (PV) cells, employ the photovoltaic effect to convert sunlight into direct current (DC) electricity. However, household and grid electricity systems mainly use alternating current (AC) due to its suitability for transmission and powering diverse appliances. Solar generated DC electricity needs conversion to AC through an inverter in solar power systems.
This device plays a crucial role by transforming the solar panel's DC output into the appropriate AC waveform and voltage level. This conversion ensures compatibility with the electrical grid and allows utilization by appliances and lighting.
Essentially, the need for inverters stems from solar cells' DC generation, contrasting with the prevalent AC based infrastructure and device requirements.
Learn more on solar inverters here https://brainly.com/question/12576588
#SPJ6
Question
9. Why do solar cells need an inverter? Please explain.
A. Their energy output is alternating current.
B. They need a way to store energy for cloudy days.
C. They need a way to share their excess energy with the electric company.
D. Their energy output is direct current.
PLEASE HELP ME :)
A cup of was left in the sun for 4 hours. It started with 230J of internal energy and ended with 580J of internal energy.
A) HOW MUCH HEAT was transferred?
B) Was the heat transferred IN or OUT of the cup?
A) 350 J
- The initial internal energy of the cup is
[tex]U_i = 230 J[/tex]
- The final internal energy of the cup is
[tex]U_f = 580 J[/tex]
According to the first law of thermodynamics:
[tex]U_f - U_i = Q+W[/tex]
where
Q is the heat absorbed by the system
W is the work done on the system
The work done on the system in this case is 0, so we can rewrite the equation as
[tex]U_f - U_i = Q[/tex]
And so we find the heat transferred
[tex]Q=580 J - 230 J=350 J[/tex]
B) IN the cup
Explanation:
in this situation, we see that the internal energy of the cup increases. The internal energy of an object/substance is proportional to its temperature, so it is a measure of the average kinetic energy of the molecules of the object/substance. Therefore, in this case, the temperature (and the energy of the molecules of the substance) has increased: this means that heat has been transferred INTO the system from the environment (the heat came from the sun).
Think about Redi's experiment described above. It was one step in building cell theory. What aspect of cell theory did Redi's experiment support?
A) All cells come from pre-existing cells.
B) Cells are the smallest and most basic unit of life.
C) All living things are composed of one or more cells.
D) The cell is the functional unit of all living things.
Answer:
A. All cells come from pre-existing cells
Explanation:
Francesco Redi's experiments aimed to test spontaneous generation, where life could emerge from non-living things. His first round included two groups of jars with raw meat in it. He covered one group with a thin cloth, allowing only air to get in, and the other group was left open.
In the jars left open, he noted maggots were present and the one that was covered contained no maggots.
The results indicated that the maggots only formed because flies laid their eggs on it and maggots developed. He did note that some maggots developed on the cloth itself, but on the outside.
Thus, he contributed in disproving spontaneous generation by showing that maggots only developed from the eggs that flies laid. This supports that all cells come from pre-existing cells.
Answer:
A)
Explanation:
WHY DO GRAPHITE AND DIAMOND LOOK DIFFERENT EVEN THOUGH THEY ARE FROM THE SAME ELEMENT?
Answer:
Although graphite and diamond are both composed of carbon atoms, their physical properties are very different. The differences are the result of the atomic structures of the minerals. In graphite the carbon atoms are arranged in layers. As a result, graphite is soft. The great hardness of diamond is the result of the bonds that hold carbon atoms in a network structure.
Explanation:
NEED HELP ASAP
Which of the following is a monomer of DNA?
a. Protein
b. Oil
c. Nucleotides
Answer:i think the answer is c but monomers are found in anything that has dna in it and almost everything does.
Explanation:
Answer:
C) Nucleotides
Explanation:
Franny drew a diagram to compare images produced by concave and convex lenses.
Which belongs to the area marked in X?
Real
Virtual
Larger than object
Upside down
Answer:
B. virtual
Explanation:
Answer on edge 2020
Virtual is referred to the area which is marked as X and is denoted as option B.
What is a Virtual image?This is defined as an upright image which is formed where the rays seem to diverge.
Both concave and convex lenses produces a virtual image which was why it was chosen as the most appropriate choice.
Read more about Virtual image here https://brainly.com/question/9861899
#SPJ2
How To Get To The Center OF The Moon And Time Travel ?
Answer:
To get to the moon you need to travel in a spacecraft and will take approximately 10 hours of travel.
Explanation:
Since the first spaceship to land on the moon in 1959 , several trips have been made so far.The NASA trip in 2006 opened more routes to the moon and achieved a time travel of 8 hours compared to the first one done in 1959 that was 34 hours of time travel.Currently, NASA has intiated programs that will see robots sent to the moon for research.
Hope this helps!
true or false? In a typical car, the crankshaft produces a linear motion that turns the wheel
a rockets is fired vertically from the ground. it moves upwards with a constant acceleration 10m/s square for 30 seconds after which the fuel is finished.after what time from the instant of firing the rocket will attain the maximum height?,find maximumu height it reaches above the ground.find total time the rockets will stay above the grounds.
Answer:
9090 m, 104 s
Explanation:
After the acceleration phase, the rocket reaches a height of:
x = x₀ + v₀ t + ½ at²
x = (0 m) + (0 m/s) (30 s) + ½ (10 m/s²) (30 s)²
x = 4500 m
And it reaches a velocity of:
v = at + v₀
v = (10 m/s²) (30 s) + (0 m/s)
v = 300 m/s
After the fuel runs out, the rocket goes into free fall. The maximum height reached is:
v² = v₀² + 2a(x - x₀)
(0 m/s)² = (300 m/s)² + 2(-9.8 m/s²)(x - 4500 m)
x ≈ 9090 m
The time to reach maximum height during free fall:
v = at + v₀
0 m/s = (-9.8 m/s²) t + (300 m/s)
t ≈ 30.6 s
And the time to land from the maximum height:
x = x₀ + v₀ t + ½ at²
0 m = (9090 m) + (0 m/s) t + ½ (-9.8 m/s²) t²
t ≈ 43.1 s
So the total time is:
t = 30 s + 30.6 s + 43.1 s
t ≈ 104 seconds
A rock is dropped from a height of 2.5 meters. What is it’s velocity when it reaches the ground? 3.5 meters/second
Answer:
7.0 m/s
Explanation:
The question is on Free-Fall
In a free fall, an object falls freely without only gravity acting on it. Velocity at the top is zero m/s
Height of fall, h=1/2gt²
Velocity, v=gt where g is gravity acceleration=9.8m/s² and t is time taken fall the fall
Finding the t taken for the fall;
h=2.5m but we know h=1/2gt²⇒substitute values in this equation
2.5=1/2×g×t²
2.5=1/2×9.8×t²⇒2.5=4.9t²
make t subject of the equation;
t²=2.5/4.9
t=√2.5/4.9 =0.7143sec
Finding the velocity
v=gt
v=9.8×0.7143=7m/s
2. What characteristics does the domain Bacteria have
Answer: Streptococcus.
Explanation:
The Bacteria and Archaea domains are prokaryotes, they contain no nuclues or organelles, only a circular chromosome. They cannot form multicells organisms. Archaea can be found in extreme evironments, such as hot springs and deep sea vents.
Albert dressed as TWO-FACE flips a coin up in the air at an upward velocity of 5.00 m/s. He fails to catch it on the way down and it falls down an 8.5 m deep well. Calculate the maximum height and maximum magnitude (could be positive or negative) of velocity of the coin.
Answer:
1.28 m, 14 m/s
Explanation:
At the maximum height, the velocity is 0.
Given:
a = -9.8 m/s²
v₀ = 5.00 m/s
v = 0 m/s
x₀ = 0 m
Find:
x
v² = v₀² + 2a(x - x₀)
(0 m/s)² = (5.00 m/s)² + 2(-9.8 m/s²) (x - 0 m)
x = 1.28 m
The maximum speed is at the bottom of the well.
Given:
a = -9.8 m/s²
v₀ = 5.00 m/s
x₀ = 0 m
x = -8.5 m
Find:
v
v² = v₀² + 2a(x - x₀)
v² = (5.00 m/s)² + 2(-9.8 m/s²) (-8.5 m - 0 m)
v = -13.8 m/s
Rounded to 2 sig-figs, the maximum speed is 14 m/s.
What is a circle graph used for?
A circle graph, or a pie chart is used to visualize information and data. A circle graph is used to easily show the results of an investigation in proportional manner. The arcs of a circle graph are prepositional to how many percent of population gave a certain answer
A circle graph is a graph in the form of a circle that's divided into pie pieces with each pie piece representing a part of the whole data set. In other words, each pie piece represents a percentage of the whole pie. Another word for a circle graph is a pie chart.
A circle graph is used to display data and it's used to recognize parts of a data set. It's useful to easily interpret what's going on in the scenario.
An example of a circle graph is provided in the image attached.
A 3-kg object experiences a temperature rise of 50°C when 1000 joules of heat are added. Using the same substance, which situation would require the same amount of heat to be added? A) A 6-kg mass experiences a temperature rise of 50°C. B) A 3-kg mass experiences a temperature rise of 50°C. C) A 6-kg mass experiences a temperature rise of 100°C. D) A 3-kg mass experiences a temperature rise of 100°C.
Answer:
B
Explanation:
This option is exactly the same as the example. Thus it would require the same amount of heat.
Answer:
B) A 3-kg mass experiences a temperature rise of 50°C.
Explanation:
As we know that the rise in temperature for 3 kg object is 50 degree C then the heat added is given as 1000 J
so here we can say that formula of heat is
[tex]Q = ms\Delta T[/tex]
here we will have
[tex]m = mass[/tex]
s = specific heat capacity
[tex]\Delta T [/tex] = temperature rise
so here if we make all three parameters same to make this heat energy same
so correct answer will be
B) A 3-kg mass experiences a temperature rise of 50°C.
How many proton must compound have if it had 50 electrons and a net charge of 9.6*10^-18C
Answer:
110
Explanation:
The net charge of the compound is the sum of the net charges due to the electrons and the protons:
[tex]Q=N_p q_p + N_e q_e[/tex]
where
Np is the number of protons
Ne = 50 is the number of electrons
[tex]N_p = +1.6\cdot 10^{-19} C[/tex] is the charge of each proton
[tex]N_e = -1.6\cdot 10^{-19} C[/tex] is the charge of each electron
[tex]Q=+9.6\cdot 10^{-18} C[/tex] is the net charge of the compound
Solving the equation for Np, we find the number of protons:
[tex]N_p = \frac{Q-N_e q_e}{q_p}=\frac{+9.6\cdot 10^{-18}C-(50)(-1.6\cdot 10^{-19}C)}{+1.6\cdot 10^{-19} C}=110[/tex]
What is the wavelength of a wave if the wave speed is 24 m/s and the frequency is 48 Hz?
Answer:
Wavelength is 0.5
Explanation:
To work it out, you divide Wave speed by the Frequency (24÷48=0.5)
Answer:
wavelength = 0.5 meters
Explanation:
Wavelength is the distance between successive trough or crest of a wave. Wavelength is inversely proportional to frequency. This means the shorter the wavelength the higher the frequency .The S.I unit of wavelength is meters.
Wavelength can be represented with a Greek symbol known as lambda (λ).
The formula below can be use to represent wavelength .
λ = v/f
where λ = wavelength
v = velocity
f = frequency
v = 24m/s
f = 48 Hertz
λ = 24/48
λ = 0.5meters
What are two main functions of the female reproductive system in the order in which they occur in the female life cycle
Answer:
Ovaries, the female reproductive organs, have two main functions: to produce female germ cells (called eggs or oocytes) and hormones (estrogen and progesterone), which regulate the function of the ovaries.
Two main functions of the female reproductive system are the Production of eggs and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.
What is the female reproductive system?The female reproductive system is a complex system of organs and structures responsible for the production of eggs (ova), the fertilization of eggs by sperm, the nourishment and development of a fertilized egg into a fetus, and the delivery of the fetus during childbirth.
The female reproductive system includes several organs and structures, including the ovaries, fallopian tubes, uterus, cervix, and vagina. The ovaries are responsible for producing and releasing eggs, while the fallopian tubes transport the eggs from the ovaries to the uterus, where fertilization can occur.
The uterus is a muscular organ that can expand during pregnancy to accommodate the growing fetus, and the cervix is the opening of the uterus that allows sperm to enter and the baby to exit during childbirth. The vagina is a muscular canal that connects the cervix to the outside of the body and serves as a passageway for menstrual flow and childbirth. Hormones such as estrogen and progesterone, which are produced by the ovaries and other organs, play an important role in regulating the female reproductive system.
Here in the Question,
The two main functions of the female reproductive system in the order in which they occur in the female life cycle are:
1. Production of eggs (ova) and preparation for fertilization: The female reproductive system begins to produce eggs during fetal development, and this process continues until menopause. The ovaries release a mature egg every month during the menstrual cycle, which is prepared for fertilization by the fallopian tubes, uterus, and cervix.
2. Nurturing and supporting a developing embryo or fetus: If the released egg is fertilized by sperm, it implants in the uterus and begins to develop into an embryo, which eventually grows into a fetus. The female reproductive system supports the developing embryo or fetus by providing it with oxygen and nutrients through the placenta. The uterus also expands to accommodate the growing fetus, and the cervix stays closed to protect it from infection. During childbirth, the uterus contracts to push the baby out through the vagina.
Therefore, Two main functions of the female reproductive system in the order in which they occur in the female life cycle are the Production of eggs (ova) and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.
To learn about the types of biology click:
https://brainly.com/question/28405832
#SPJ2
7. An echo is the result of a reflected_____
Answer:
Its from a reflection of sound waves against a hard surface
Explanation:
A weightlifter lifts a 250-kg mass 0.5 meters above his head, how much PEg does the mass have (Note: g=9.8 m/s2)? Round your answer to the nearest whole number. J
Answer:
1225 J
Explanation:
The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by
[tex]PE=mgh[/tex]
where
m is the mass
g = 9.8 m/s^2 is the acceleration due to gravity
h is the height at which the object has been lifted
In this problem, we have
m = 250 kg
h = 0.5 m
So, the PE of the object is
[tex]PE=(250 kg)(9.8 m/s^2)(0.5 m)=1225 J[/tex]
Answer:
1225J
Explanation:
The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by
where
m is the mass
g = 9.8 m/s^2 is the acceleration due to gravity
h is the height at which the object has been lifted
In this problem, we have
m = 250 kg
h = 0.5 m
So, the PE of the object is
1225J
A cup falls off of a table from a height of 0.75m. What is the impact speed of the cup?
Answer:
3.822 m/s
Explanation:
You can solve this by using the kinematic equations:
[tex]v_{f} = v_{i}+gt[/tex]
[tex]d = v_it\times\dfrac{1}{2}gt^{2}[/tex]
Where:
Vf = final velocity (impact velocity)
Vi = initial velocity
g = acceleration due to gravity
d = distance traveled
t = time
Acceleration due to gravity on Earth is constant. Gravity accelerates objects towards the ground at 9.8m/s².
Initial velocity is always at 0 m/s in free fall. Let's see what we have as our given:
d = 0.75m
Vi = 0 m/s
g = 9.8 m/s²
Look at our equation for the impact velocity (Vf) with our current given plugged in:
[tex]v_{f}=v_{i}+gt[/tex]
[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]
We still do not have time. That is where the second equation comes in. We plug in our values again in the secon equation and derive time:
[tex]d=v_{i}t+\dfrac{1}{2}gt^{2}\\\\0.75m=0m/s(t)+\dfrac{1}{2}(9.8m/s^{2})(t^{2})\\\\0.75m = 0+(4.9m/s^{2})(t^{2})\\\\\dfrac{0.75m}{4.9m/s^{2}}=t^{2}\\\\\sqrt{ 0.15s^{2}}=\sqrt{t^{2}}\\\\0.39s=t[/tex]
So our time is 0.39s. Now we use this in our first equation:
[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]
[tex]v_{f}=(9.8m/s^{2}(0.39s)[/tex]
[tex]v_{f}=3.822m/s[/tex]
What does the slope of a distance vs. time graph indicate about an objects motion?
Answer:
Shape of a velocity versus time graph reveals pertinent information about an object's acceleration.
Explanation:
For example, if the acceleration is zero, then the velocity-time graph is a horizontal line (the slope is zero). The gradient of a distance-time graph represents the speed of an object. The velocity of an object is its speed in a particular direction. The slope on a velocity-time graph represents the acceleration of an object. The distance travelled is equal to the area under a velocity-time graph.
The curve of a velocity vs time graph reveals significant information about an object's acceleration.
What is a time velocity graph?The acceleration of the object is shown by the graph between velocity and time. Any object's acceleration is the variation in velocity with the passage of time. On the graph, this temporal variation with regard to velocity is shown.
For instance, if the acceleration is 0, the velocity-time graph is a horizontal line. (There is no slope.) The gradient on a distance-time graph corresponds to an object's speed.
The velocity of an object is its speed in a certain direction. The slope of a velocity-time graph represents an object's acceleration. The distance traveled is displayed on the underside of a velocity-time graph.
Therefore, a velocity versus time graph's shape provides important details about an object's acceleration.
To know more about the time velocity graph follow
https://brainly.com/question/5285428
#SPJ2
Number the steps of stellar evolution in the correct order
Answer:
Step 1 - 4. Nebular cloud of gas and dust.
Step 2. - 2. Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.
Step 3. - 6. Condensed material begins to combine and form a core center, as it warms, a protostar is formed.
Step 4. - 3. Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.
Step 5. - 5. Stellar core heats as it grows; nuclear fusion begins and a star is born.
Step 6. - 1. Nuclear energy runs out; death: possible supernova.
Answer:
A star is a plasma ball held together by its gravity and compressed by a nuclear fusion at some stage in its development. The closest star on Earth is called the Sun. Several other stars can be seen in the night sky, but none of them is comparable to the Sun due to their very large distances to Earth. Traditionally, stars have been grouped into different constellations.
The stars are formed mainly by the collapse of gas vapors consisting of hydrogen due to gravity. Once the star core is formed, it slowly begins to convert hydrogen to helium in the nuclear fusion. The energy generated in the process flows from the center of the star to its surface and later radiates to outer space. The star is in equilibrium because its internal radiation pressure prevents gravity from collapsing further. When a star's hydrogen fuel is exhausted, its final fate depends on its mass: the smallest stars slowly fade away, while the more massive ones expand into red giants. Eventually, the red giants explode as a supernova, spreading various elements into space. Depending on the mass of the exploded star, for example, the remnant of an explosion may remain a neutron star or a black hole.
By observing the motion, luminosity, and spectra of a star, it is possible to determine its other properties such as mass, age, and metal content. There are several different types of stars. The most common tool for classifying them is the Hertzsprung-Russell diagram.
Gravitationally bound star systems of two or more stars are quite common. On a large scale, stars are an important part of galaxy structure, together with interstellar gas and dark matter.