The electrical charge of the metal sphere is ∈ = 2.78×10⁻⁷C
The value of the load or strength of the paint droplet is ∈ = 2×10⁻¹⁰ C
What are forces?Forces are the definition of Newton's second law, which is stated under the relation:
∑ Force = mass × acceleration.
In other words, force is the origin of motion since it generates acceleration in a system.
Completamos el enunciado:
"An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. (a) What charge is on the sphere? (b) What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?"
We must determine the charge on the sphere initially.
a) We determine the radius of the sphere:
r = 0.2m/2
r = 0.1mPotential = 25000V∈ = rV/k
∈ = (0.1m)(25000V) / (9×10⁹Nm²/C²)
∈ = 2.78×10⁻⁷C
b) If the mass of the paint drop is 0.1mg, and it moves with a velocity of 10m/s, we determine the kinetic energy.
Ke = mV²/2
Ke = 0.1×10⁻⁶kg (10m/s)² / 2
Ke = 5×10⁻⁶J = ΔE
∈ = ΔE/ ΔV
∈ =5×10⁻⁶J / 25000V
∈ = 2×10⁻¹⁰ C
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The shape of municipal water tank has the same shape as a drop of water resting on a nonabsorbent surface, such as a wax paper. explain why engineers design the tank in this manner.
The shape of municipal water tank has the same shape as a drop of water resting on a nonabsorbent surface, such as a wax paper.
The engineers design the tank in this manner because:
Economic structureA cylindrical water tank is more economical to build than others because it requires less construction material. The main reason is that it has the smallest possible girth-to-area ratio than a box-shaped tank. Here you can save costs.
Constant heat levelSince circular structures minimize the surface area that heat radiates from, the water temperature remains more stable than other structures such as a square or rectangle. It therefore remains less affected by changing outside temperatures and keeps the water cooler in summer and warmer in winter.
Strong and durableAccording to Monolithic, the round structure is the strongest geometric structure than the square. Thus, a cylindrical water tank can withstand all external forces, such as strong wind or heavy rain, better than a square or rectangular tank. Thanks to this, the tank lasts longer.
Easy cleaningCylindrical tanks are comparatively easier to clean than tanks with corners. Therefore, the water remains more hygienic in round water tanks than others.
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Create a hypothesis using If, then and because.
Hypothesis: If I lower the amount of prey, then the frog population would lower, because the frogs would not have any food and then they would die.
Mark me brainliest. :)
distinguish between a longitudinal and transverse waves
Answer:
In a longitudinal wave, the medium or the channel moves in the same direction with respect to the wave. Here, the movement of the particles is from left to right and forces other particles to vibrate. In a transverse wave the medium or the channel moves perpendicular to the direction of the wave.
Explanation:
HELP WILL GIVE BRAINLIEST AND FOLLOW!!!
Answer:
CO2 and H2O
Explanation:
The density of sugar is 1.58 g/cm3 what is its density in pounds per cubic inch (lb/in3)?
The density of sugar, which is in 1.58 g/cm³, is equivalent to 0.05708 in/in³.
What is Density?Density is a measure of the mass of matter contained by a unit volume.
Density is a function of mass and density, hence, it is measured in units of grams (g) and cubic centimeters (cm³).
However, cubic centimeters can be converted to pounds per cubic inch as follows:
1 gram / cubic centimetre = 0.0361 pound / cubic inch
According to this question, the density of sugar is 1.58 g/cm³. This value is equivalent to;
= 1.58 × 0.0361 = 0.05708
Therefore, the density of sugar, which is in 1.58 g/cm³, is equivalent to 0.05708 in/in³.
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A certain current produces a magnetic field be near the center of the solenoid if the current is:__________
A certain current produces a magnetic field be near the center of the solenoid if the current is 3B .
Thus, the magnetic field in the core of a solenoid is directly proportional to the product of the current flowing around the solenoid and the number of turns per unit length of the solenoid. This, result is exact in the limit in which the length of the solenoid is very much greater than its diameter.
Now,
Magnetic field due to solenoid
B= u0nI
where n is number of turns per unit length and I is current.
Now I is tripled, hence magnetic field
B' =μon 3I =3B.
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A constant acceleration means that the speed of the object is __________.
Select all that apply. Please explain your reasoning.
A. constant
B. gradually increasing
C. gradually decreasing
D. null
A. A constant acceleration means that the speed of the object is constant.
What is constant acceleration?
Constant acceleration is defined as a change in velocity that does not vary over time.
During constant acceleration of an object, the change in velocity of the object with time is the same or constant for all points of the object's motion.
a = Δv/Δt
where;
Δv is change in velocity of the objectΔt is change in time of motion of the objectDuring constant acceleration, the variable change in velocity (Δv) will be constant with change in time.
Thus, a constant acceleration means that the speed of the object is constant.
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A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic force on the loop is.
A circular loop of wire carries a constant current. If the loop is placed in a region of the uniform magnetic field, the net magnetic force on the loop is zero.
In an electric loop, the current-carrying wire creates a magnetic field that is perpendicular to the direction of the current.
Now let's suppose there are two diametrically opposite objects as shown in the figure below.
As the current is moving in the opposite direction, therefore, the effect of forces will cancel out each other due to
dF =i( dl × B ).
It is because the magnetic field is perpendicular to the plane of the loop.
Thus, all forces will cancel out their effect and the net force on the loop will be zero.
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What happens to the flow velocity and erosive power of a stream during a high discharge event if levees have been created to confine flow to the channel? (remember q = wdv)
The chance that one, and only one, of the dice will land acer is It could boost the river's erosive force and flow rate.
When water from rain, snowmelt, and groundwater is brought to the surface, steam flow starts. Drainage systems are created in a way that effectively removes water from the land. Moving sheetwash, a thin water surface layer, is where streamflow starts. As it descends the sharpest slope, the water begins to erode the surface by forming tiny rill channels. Larger channels form as the rills merge, deepen, and downcut. Headward erosion, often known as rapid erosion, lengthens the channel upslope. Smaller tributaries join a bigger stem stream as neighboring channels merge over time.
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At any instant, how many water molecules are ionized in 1 l of pure water at ph 7.0? (b) express this number as a percentage of the total water molecules
The number of water molecules which are ionized in 1L of pure water at pH 7.0 is equivalent to 6×10¹⁶ molecules.
The number as a percentage of the total water molecules is 1.8×10⁻⁷ % .
At pH 7.0, [H⁺]=10⁻⁷ M, so 10⁻⁷ moles of water molecules have ionized. This is almost equal to (10⁻⁷ mol)(6×10²³ molecules. mol⁻¹) = 6×10¹⁶ molecules.
For the second part of the question let the concentration of water be 55.5 M, then there are (55.5 mol)(6×10²³ molecules.mol⁻¹) = 3.3×10²⁵ molecules of water in 1L. The fraction of ionized molecules is 6×10¹⁶ molecules)/(3.3×10²⁵ molecules) = 1.8×10⁻⁹ or 1.8×10⁻⁷ %.
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A person is on a paddleboard. The person exerts a force on the water with
the paddle, causing the water to move. The paddleboard also moves, but in
the opposite direction. Which statement best explains why this happens?
O Inertia
O Action and reaction forces
Newton's 2nd Law of motion
O Law of Conservation of Momentum
Answer:
action and reaction forces
Explanation:
An motion pressure is a pressure that is utilized to an object. A response pressure is a outcome of an action force which is opposite in direction.
When your car is moving at 3.85 m/s and car has a mass of 881 kg, how much translational kinetic energy does it have?
The translational kinetic energy does it have -6,528.21 joule
we have given the values of
v = 3.85m/s
m = 881 kg
kinetic energy = m[tex]v^2[/tex]/2
= 881 [tex]\times[/tex] [tex](3.85)^2[/tex]/ 2
= 881 [tex]\times[/tex]14.82/ 2
= 13,056.42
= 6,528.21 joule
Hence kinetic energy of car is 6,528.21 joule
Units energy is measured in joulesKinetic Energy is the energy of an object's motion due to the object's motion example A rolling ball, a moving rollercoaster, and a toy car.Kinetic energy depends on Mass and speedKinetic Energy is the energy of motion when an object falls It's potential energy is converted into kinetic energy Therefore, potential energy lost = kinetic energy gained mgh = 1/2 m [tex]v^2[/tex]To know more about Kinetic Energy visit : https://brainly.com/question/12669551
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You stand on a scale that rests on the floor of an elevator that is accelerating upward. what is the relationship between the force due to gravity (mg) and the normal force (n) exerted by the scale?
The relationship between the force due to gravity (mg) and the normal force (n) exerted by the scale
due to upward accelaration.
N = mg + ma , here N MEANS normal force
here now, N > mg realtionship between normal force and force
whilst an item sits on a surface, the floor exerts a force on that object. This force is called the normal pressure, ordinary method "perpendicular" no longer "regular". The everyday force is always perpendicular to the floor.The everyday force is equal to the load of the item (for this class) = mg .The regular force is the "same and opposite response pressure" to the items weight. It continues the object from falling thru the floorForce is measured in Newtons. NTo know more about normal force visit : https://brainly.com/question/18799790
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Pls answer this
It’s urgent
Answer:
mohans face simple
if u see the drivers face in the mirror
the drive will see ur face
You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building. Before the state legislature votes on funding for the project, they would like you to prepare a report on the benefits of upgrading the elevators. One of the numbers that they have requested is the time it will take the elevator to go from the ground floor to the 102nd floor observatory. They are unlikely to approve the project unless the new elevators make the trip much faster than the old elevators.
If state law mandates that elevators cannot accelerate more than 2.70 m/s2 or travel faster than 14.3 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor?
Answer:
31.38 s (2 d.p.)
Explanation:
Constant Acceleration Equations (SUVAT)
[tex]\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}[/tex]
When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.
-----------------------------------------------------------------------------
To find the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor, we to accelerate to the maximum allowed velocity as quickly as possible, maintain the maximum velocity for as long as possible, and then decelerate for the shortest period of time in order for the elevator to come to a stop after 373 m.
Therefore, the travel time from the start of the elevator trip to the end will have three phases:
AccelerationConstant velocityDecelerationPhase 1 - AccelerationGiven information:
[tex]u = 0 \sf \; m/s[/tex][tex]v= 14.3 \sf \; m/s[/tex][tex]a= 2.70 \sf \; m/s^2[/tex]The time it takes to accelerate from rest to the maximum allowed velocity, where the elevator accelerates at the maximum allowed acceleration:
[tex]\begin{aligned}v & = u+at\\\implies 14.3 & = 0+2.7t\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]
The distance covered in this time is:
[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 14.3^2 & = 0^2 + 2(2.7)s\\204.49 & =5.4s\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]
Phase 3 - DecelerationGiven information:
[tex]u = 14.3 \sf \; m/s[/tex][tex]v= 0 \sf \; m/s[/tex][tex]a= -2.70 \sf \; m/s^2[/tex]When the elevator is decelerating from the maximum velocity to being at rest, it will take the same amount of time and cover the same distance as its acceleration phase:
[tex]\begin{aligned}v & = u+at\\\implies 0& = 14.3+(-2.7)t\\2.7t&=14.3\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]
[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 0^2 & = 14.3^2 + 2(-2.7)s\\0 & = 204.49 -5.4s\\5.4s&=204.49\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]
Phase 2 - constant velocityThe total distance the elevator travels is 373 m.
Therefore, the distance it travels during phase 2 when it is traveling at a constant (maximum) velocity is the total distance less the distance traveled in phases 1 and 3:
[tex]\begin{aligned}\implies s & =373-2(37.86851852)\\s& = 297.262963\;\sf m\end{aligned}[/tex]
Given information:
[tex]u = 14.3 \sf \; m/s[/tex][tex]v= 14.3 \sf \; m/s[/tex][tex]s = 297.262963\;\sf m[/tex]Therefore, the time is takes to travel this distance when it is traveling at a constant (maximum) velocity is:
[tex]\begin{aligned}s&=\left(\dfrac{u+v}{2}\right)t\\\implies 297.262963 & = \left(\dfrac{14.3+14.3}{2}\right)t\\297.262963 & = 14.3t\\t & = \dfrac{297.262963}{14.3}\\t & = 20.78761979 \; \sf s\\\end{aligned}[/tex]
Total minimum timeTherefore, the minimum time is the sum of the time calculated for the three phases:
[tex]\begin{aligned}\sf Minimum \: time& = \sf Phase \: 1 + Phase \: 2 + Phase \: 3\\& = 5.296296...+5.296296...+20.78761...\\& = 31.38021...\\& = 31.38\; \sf s\end{aligned}[/tex]
A car traveled at an average speed of 65 mph for 10 hours.
How far did it travel?
10 miles
10 miles
65 miles
65 miles
650 miles
650 miles
6,500 miles
Answer:
650 miles
Explanation:
if car 65mph constant = 1hour = 65 mile x 10 = 650.
What is the identity of a metal that has a mass of 27.0 g and a volume of 10.0 cm3?
The metal with a mass of 27.0 g and a volume of 10.0 cm3 has a density of: 2.70 g/cm3
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
m = 27.0 gv = 10.0 cm3d= ?Applying the density formula, we get:
d = m/v
d = 27.0 g/ 10.0 cm3
d = 2.70 g/cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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What wavelength of light (nm) is required to eject an electron with a speed of 2.0 x 10^6 m/s from a metal with a threshold energy of 3.4 x 10^-18 j?
The wavelength of light (nm) is required to eject an electron with a speed of [tex]2.0 \times 10^{6}[/tex] m/s from a metal with threshold energy of [tex]3.4 \times 10^{-18 }[/tex]jis 0.39nm.
A periodic wave's spatial period, or the distance across which the wave's form repeats, is defined by its wavelength. It is a characteristic of both traveling and standing waves as well as other spatial wave patterns, and it is the distance between two adjacent corresponding points of the same phase on the wave.
Speed of proton =[tex]c= 2.0 \times 10^6[/tex] m/s
The threshold energy of the proton is [tex]E = 3.4 \times 10^{-18} J[/tex]
The proton's wavelength is expressed as follows:
λ=hc/E
h is the Planck constant in this situation.
Now substituting the values,
λ= [tex](6.63\times 10^{-34}J/s\times 2.0 \times 10^{6} m/s)/3.4\times 10^{-18} J[/tex]
=3.9x 10^-10 m
=0.39nm
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who was newton? who was albert einstein?
Answer:
Newton discovered gravity and Albert Einstein is a theoretical physics
Explanation
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If a cheetah can reach speeds of 33 m/s, how long will it take to travel 1 km? Best answer will be mark Brainliest!
Answer: 30.3 seconds
Explanation:
1000 m=1 km
33m * 1 km/1000 m=
33 * 1/1000=
33/1000=0.033 km
1/0.033=30.3030...
30.3030=30.3 seconds
A particle is moving at 0.86c. by what magnitude percentage is the newtonian expression for momentum in error?
The calculated magnitude percentage is 125 %.
The Heisenberg Principle has a significant impact on how science is done and how experiments are created. This will transfer some of the momentum from the second particle to the electron being measured, changing it. A particle with a shorter wavelength and higher energy would be needed to measure the electron's position with more accuracy, but this particle would also change the momentum of the collision even more.
Pi is P Pf plus 50/100. P = 3/2 P
E = P2/2m describes how kinetic energy and momentum are connected.
E2 = (E2 - E 1)/E1 [E1 = E, E2 =?
100 = Pi 2/ 2m/ (Pf 2/2m - Pi 2/2m)
×100 = {(3/2) ² - 1} ×100 = (2.25-1) ×100 = 125%
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Jeremy hypothesized that adults with blue eyes are shorter than adults with brown eyes. He collected data by visiting all of the teachers in his school and found that his hypothesis was false. Should Jeremy consider his hypothesis useful?
A.
Yes; now he knows that the exact opposite of his hypothesis must be true.
B.
Yes; a false hypothesis gives a scientist new information to use.
C.
No; a false hypothesis makes a scientist look silly.
D.
No; false hypotheses are a waste of time.
Answer: B. Yes; a false hypothesis gives a scientist new information to use.
Explanation:
Let us take a look and break down all the question's answer options.
✗ A.
Yes; now he knows that the exact opposite of his hypothesis must be true.
➜ This is not the case. He must look at this data and decide what is true.
✓B.
Yes; a false hypothesis gives a scientist new information to use.
➜ Yes! We learn from our research and looking back at our hypothesis.
✗ C.
No; a false hypothesis makes a scientist look silly.
➜ This isn't true. You cannot expect to be right all the time, and scientists make incorrect hypotheses frequently.
✗ D.
No; false hypotheses are a waste of time.
➜ Tying back into B and C, this isn't true. We learn from comparing our hypotheses with our data.
Answer in units of m/s.
Answer:
The metre per second (m/s) is the unit of both speed (scalar quantity) and velocity in the International System of Units (SI).
Aristarchus measured the angle between the sun and the moon when exactly half of the moon was illuminated. he found this angle to be:_________
Aristarchus measured the angle between the sun and the moon when exactly half of the moon was illuminated, he found this angle to be 90 degree.
The Moon exhibits a circular motion around the Earth as well as the relative position occupied by the sun, the earth, and the moon results in the creation of the lunar phases.
Aristarchus realized the fact that the Moon was exactly half illuminated as it forms a right triangle with the Sun and the Earth. As by knowing the distance occupied between the Earth and the Moon, the one and only thing he needed was the angle that existed between the Moon and Sun to compute the distance of the Sun itself at that present moment
In this case, whenever the Sun is illuminating half of the Moon, the angle between the sun and the moon must be at 90°. Actually, this angle changes according to the movement of the moon as there it will be zero degrees for the new moon as well as 180° for the full moon.
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5.when an object is weighed in air, its weight is wair=10.8 n. when completely immersed in water, however, it has a weight of wwater=1.00 n. what is the (a) volume and (b) density of the object?
According to Archimedes' principle, (a) the submerged volume is 1 liter and (b) the density of object is 1102 kg/m³.
We need to know about Archimedes' principle to solve this problem. Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid is proportional to the volume and density of the fluid. It can be determined as
Fb = ρ . g . V
where Fb is buoyant force, ρ is the density of the fluid, g is the gravitational acceleration (9.8 m/s²) and V is submerged volume.
The buoyant force also can be calculated by measuring the change in weight in air and water
Fb = Wa - Ww
where Wa is weight in air and Ww is weight in water.
From the question above, we know that
Wa = 10.8 N
Ww = 1 N
ρ = 1000 kg/m³
Find the buoyant force
Fb = Wa - Ww
Fb = 10.8 - 1
Fb = 9.8 N
Determine the submerged volume
Fb = ρ . g . V
9.8 = 1000 . 9.8 . V
V = 1/1000 m³
V = 1 dm³ = 1 liter
Determine the density of the object
Wa = m . g
10.8 = m . 9.8
m = 1.102 kg
ρ = m/V
ρ = 1.102 / 1
ρ = 1.102 kg / liter
ρ = 1102 kg/m³
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Find the net force including its direction of the following: 175n to the left, 234n to the right, 75n to the right, 225n to the left, and 45n to the right
The net force is 46 N to the left.
We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as
R = F1 + F2 + ... + Fn
where R is force resultant (net force)
From the question above, we know that
(Assume that the right direction is positive and left direction is negative)
F1 = -175 N
F2 = 234 N
F3 = 75 N
F4 = -225 N
F5 = 45 N
By substituting the following parameters, we can calculate the net force
R = F1 + F2 + F3 + F4 + F5
R = -175 + 234 + 75 - 225 + 45
R = -46 N
Hence, the net force is -46 N
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Calculate the amount of water (in grams) that must be added to (a) 5.80 g of urea [(nh2)2co] in the preparation of a 6.40 percent by mass solution:
The amount of water (in grams) that must be added to 5.80 g of urea [(nh2)2co] in the preparation of a 6.40 percent by mass solution is 84.83g.
How to calculate the amount of water added?When the masses of a solute and a solution are provided, the concentration of the solution is expressed using the mass percent:
Mass% = Mass of Solvent 100% of Solution's Mass
The percent by mass solution = the grams of solute in 100 g. of solution.
(A) So, 6.40 g of urea are contained in 100 g of solution.
So, 93.6 water was added to make a 6.40 g solution.
Thus for, 5.80 g of urea,
(5.8*93.6)/6.4 = 84.83g
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I need help ASAP
You need to match each thing to it’s place I’m not sure
Answer:
1st box: 2
2nd box: 1
3rd box: 4
4th box: 3
Explanation:
Kinetic energy the energy an object has due to its being in motion. Potential energy is energy held by an object because of its position relative to another object.
During stage 3 of star formation, the dense, opaque region at the center of the cloud is called a:_____.
During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.
What is Herbig-Haro object?Bright nebulosity patches known as Herbig-Haro (HH) objects are linked to young stars. They are created when fast-moving, nearby clouds of gas and dust meet with narrow jets of partly ionized gas released by stars. Typical Herbig-Haro objects can contain up to 20 Earth masses of material and have temperatures of about 10,000 Kelvin.
They also have densities of a few thousand to a few hundred thousand particles per cubic centimeter. Over 600 have been discovered so far, all in star-forming regions and typically connected to Bok globules. They were once extremely rare. A brilliant cloud that stretches away from a star in the process of formation is known as a Herbig-Haro object (or HH object). The gravitational agglomeration of clouds produces protos tars.
Hence, During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.
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A high-mass star near the end of its life undergoes successive cycles of energy generation within its core in which gravitational collapse increases the temperature to the point where a new nuclear fusion cycle generates sufficient energy to stop the collapse. This process does not work beyond the silicon-fusion cycle that produces iron. Why is this?"".
The process of gravitational collapse does not work in the silicon-fusion cycle that produces iron. It is because the iron nuclei do not have sufficient energy and therefore will not produce the additional gas pressure to halt the collapse.
The gravitational collapse process is a process during which astronomical objects such as massive stars contract due to their own gravitational pressure.
The gravitational pull draws the matter to the core of the object thus increasing energy generation which in turn increases the temperature of the central part of the object.
Due to this fundamental process, the old structure collapse, and new structure are formed in the universe.
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