What is the first step of thermonuclear fusion within the Sun to form helium-4?
A. Electrons and protons fuse to form the nucleus of a helium atom.
B. The fission of hydrogen to form protons and neutrons.
C. Two hydrogen nuclei, each with only one proton, fuse to form deuterium, a form of hydrogen with one proton and one neutron.
D. Two lithium atoms, each with three protons and three neutrons, undergo fission to form hydrogen atoms with one proton and one neutron.
Answers
Great Question! I happened to be a physics nerd!
Answer:
C. Two hydrogen nuclei, each with only one proton, fuse to form deuterium, a form of hydrogen with one proton.
MAKE SURE TO SEE EXPLANATION!
Explanation:
In the core of the Sun, or any other main sequence star, there is no single fusion process. Instead, complex sequences of processes occur to make helium nuclei from hydrogen nuclei (i.e. protons). The proton-proton chain provides for the majority of energy generation in stars with masses less than that of the Sun. One difficulty in creating a helium nucleus (two protons and two neutrons) is that there are only protons to begin with. Some protons must be turned into neutrons in some way. The first step is to combine two protons to form a deuterium nucleus (also known as a deuteron). That's a hefty hydrogen nucleus with one proton and one neutron. Such a proton-proton contact is highly unlikely, and it has never been detected in a laboratory. Fortunately, the Sun's core is incredibly hot and dense, with an incredible number of protons packed inside. Even a low likelihood event will occur every now and again. Along with each deuteron, a positron (an "anti-electron") and a neutrino are created. Because the Sun's core is plasma, there are a lot of free electrons, thus the positron doesn't live long until it and an electron collide and annihilate, resulting in gamma radiation. The deuteron then interacts with a proton to form a helium 3 nucleus. That is a high-probability interaction, and it occurs swiftly. Two helium 3 nuclei join in the third phase to generate a helium 4 ("regular" helium) nucleus and a proton. Branch I of the proton-proton (p-p) chain is responsible for this. Another stage is required because reactions between helium 3 and helium 4 nuclei are possible. There are two conceivable reactions (named Branch II and Branch III), and I'll save you the gory details. It gets much more complicated since theoretical calculations indicate that a reaction between a helium 3 nucleus and a proton is feasible — Branch IV. This reaction has an incredibly low likelihood of occurring, far lower than the Branch I reaction, thus it must be exceedingly rare. The Carbon-Nitrogen-Oxygen (CNO) Cycle is another method for reducing hydrogen to helium. It does not generate much energy in the Sun, but it is the principal energy generation mechanism in larger stars.
Related Questions
tripling both the tension in a guitar string and its mass per unit length will result in changing the wave speed in the string by what factor?
Answers
There would be no change as the wave speed would be 1. Option B
What is the factor?According to the wave equation for a string, the wave speed (v) is given by the equation:
v = √(T/μ)
Tripling both the tension in a guitar string and its mass per unit length;
T₂ = 3T₁ (tripling the tension)
μ₂ = 3μ₁ (tripling the mass per unit length)
We have for the wave speed
v₂ = √(T₂/μ₂)
= √((3T₁)/(3μ₁))
= √(T₁/μ₁)
= v₁
We can see that based on the calculations that we have done in the problems. It is plane that there is no change in the wave speed.
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The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio
Answers
Answer:
1 : 2 (30 : 60)
Explanation:
The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio 1 : 2 because 30 : 60 simplified is 1 : 2.
If the answer does not ask for the ratio to be simplified leave its as 30 : 60.
How many hydrogen atoms are there in one molecule of PH3?
Answers
Answer:
On molecules of PH3, there has to be 3 atoms.
Explanation:
The Element Hydrogen (H) has 3 attoms.
The Element Phosphorus (P) has 1 atom.
These two created into the molecule PH3, would have to have only 3 attoms because they are asking how many hydrogens atoms are in the molecule PH3.
2. A car acquires a velocity of 32 m/s by accelerating at 4.0 m/s²
for 5.0 s. What was its initial velocity?
Answers
Answer:
v = a t = 4 m/s^2 * 5 s = 20 m/s
It can increase its speed by 20 m/s
Using V = V0 + a t
V0 (initial speed) had to be 12 m/s
A disk begins rotating from rest with an angular acceleration of a in rad/s. Which of the following equations is correct for the time in seconds it takes for the disk to complete one full rotation? A. t = 1/2αB. t = πα C. t = sqrt(2/α)D t = sqrt(2π/α)E. t = sqrt(4π/α)
Answers
The correct equation for the time it takes for a disk to complete one full rotation, given an angular acceleration of α, is option D: t = sqrt(2π/α).
To understand why, we can use the kinematic equation that relates angular acceleration (α), angular velocity (ω), and time (t) for an object undergoing rotational motion:
ω = αt
In one full rotation, the initial angular velocity is zero (as the disk starts from rest) and the final angular velocity becomes a full revolution, which is 2π radians. So we have:
2π = αt
Solving for t, we get: t = 2π/α
Thus, the correct equation for the time it takes for the disk to complete one full rotation is t = sqrt(2π/α). This equation represents the relationship between the angular acceleration and the time required for the disk to make a complete revolution.
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Sally pulls a sledge
Answers
A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the sportscar?
Answers
Answer:
7500 Newtons
Explanation:
Mass of the sportscar= 1500 kg
Acceleration of the sportscar= 5m/s^2
Hence, let the Force acting on it be F
\(We\ know\ that,\\Force=Mass*Acceleration\\F=ma\\\\Here,\\F=1500*5\\=7500 kg m/s^2\ or\ 7500\ Newtons\)
PLEASE HELPPPPPPPPPPPPPPPPPPPP
Answers
The first: 1,026m
The second: decreases
The third: 7.9 mya
hope i helped some :))
Predict the energy transformations when a fast moving roller coaster finishes its ride and comes to a stop. Give three possibilities.
Answers
Since energy cannot be destroyed nor created but it can only be transformed from one form to another, the three possibilities energy transformations will be:
Kinetic energykinetic energy + potential energypotential energy.What is Conservation of Energy ?Conservation of energy state that energy cannot be destroyed nor created but it can only be transformed from one form to another.
When a fast moving roller coaster finishes its ride, before this, the roller coaster will be experiencing maximum kinetic energy. when it is trying to come to rest, the maximum energy = kinetic energy + potential energy and when it finally comes to a stop, the maximum energy will be equal to potential energy.
Therefore, the three possibilities energy transformations will be Kinetic energy, kinetic energy + potential energy and potential energy.
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the radius of the planet mercury is 2.43*10^6m and its mass is 3.2*10^23 kg. find the period of a satellite orbiting mercury 265,000 m above its surface?
Answers
The period of a satellite orbiting mercury 265,000 m above its surface is 100 minutes if the radius of the planet mercury is 2.43*10^6m and its mass is 3.2*10^23 kg.
v = √ G M / r
r = R + d
v = Orbital velocity
G = Gravitational constant
M = Mass of planet
r = Radius of the orbit
R = Radius of planet ( mercury )
d = Distance from surface to satellite
m = 3.2 * \(10^{23}\) kg
R = 2.43 * \(10^{6}\) m
d = 265000 m
G = 6.67 * \(10^{-11}\) N m² / kg²
r = R + d
r = 2.43 * \(10^{6}\) + 265000
r = 2.695 * \(10^{6}\) m
v = √ ( 6.67 * \(10^{-11}\) * 3.2 * \(10^{23}\) ) / 2.695 * \(10^{6}\)
v = √ 7.92 * \(10^{6}\)
v = 2.81 * 10³ m / s
v = 2.81 km / s
v = 2 π r / T
T = Time period
T = 2 * 3.14 * 2.695 * \(10^{6}\) / 2.81 * 10³
T = 6.02 * 10³ s
T = 100 minutes
Therefore, the period of a satellite orbiting mercury is 100 minutes
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PLEASE HELP ME ASPAa car travels 500km in 4 hours find its speed in km/h
Answers
Answer:
solution
distance travelled : 500km
time taken:4 hour
speed:?
now
speed: distance travelled ÷ time taken
or, 500 ÷ 4
therefor,speed :125km/h
What is the phase change called, when a GAS turns in to a SOLID
Answers
Answer:Deposition
Explanation:Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. ... The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
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.
Answers
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.
What is equilibrium?
Answers
Answer: Equilibrium is the state in which market supply and demand balance each other, and as a result prices become stable. The balancing effect of supply and demand results in a state of equilibrium.
This is the answer please ap mujhe follow kar lo please
A football player threw a football with a velocity of (3.0 m/s x + 5.0m/s y). How far did it travel horizontally?
Answers
The horizontal distance travelled by the football is 3.1 m.
What is the angle of projection of the ball?
The angle of projection of the football is calculated as follows;
tan ( θ ) = Vy / Vx
where;
Vy is the velocity of the ball in the vertical directionVx is the velocity of the ball in the horizontal directiontan ( θ ) = 5 / 3
tan ( θ ) = 1.667
θ = arc tan (1.667)
θ = 59⁰
The resultant velocity of the ball is calculated as follows;
v = √ (Vx² + Vy²)
v = √ (3² + 5²)
v = 5.83 m/s
The horizontal distance travelled by the football is calculated as follows;
x = v² sin(2θ) /g
where;
v is the resultant velocityg is acceleration due to gravityθ is the angle of projection of the ballx = [ (5.83)² sin(2 x 59) /9.8 ]
x = 3.1 m
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PLEASE HELPPP ILL DO ANYTHING Write 1 paragraph or more and use all three of Newton’s laws of motion to describe what happens when a car starts off at rest, is pushed across a platform, and then accelerates downward. State each of Newton's laws and give examples of how they are shown in the image.
Answers
Answer:The motion of an aircraft through the air can be explained and described by physical principals discovered over 300 years ago by Sir Isaac Newton. Newton worked in many areas of mathematics and physics. He developed the theories of gravitation in 1666, when he was only 23 years old. Some twenty years later, in 1686, he presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis." The laws are shown above, and the application of these laws to aerodynamics are given on separate slides.
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net force acting on an object (if all the external forces cancel each other out) then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.
The second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum (mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the "changes" expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object's mass and its acceleration a:
F = m * a
For an external applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways.
The third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A. Notice that the forces are exerted on different objects. The third law can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.
You can view a short movie of "Orville and Wilbur Wright" explaining how Newton's Laws of Motion described the flight of their aircraft. The movie file can be saved to your computer and viewed as a Podcast on your podcast player.
Explanation:
Jack tries to place magnets on the door of his refrigerator he observes that the magnets don’t stick he guesses that the door of the refrigerator is made of non-metallic substance what stage of scientific investigation does his guess represent
Answers
Hypothesis after observation.
Unlike hard disks, which use magnetic charges to represent 1s and 0s, _____ use reflected light.
Answers
Answer:
Unlike hard disks, which use magnetic charges to represent 1s and 0s, Compact Disks, DVD's or Blue Rays use reflected light.
Explanation:
The way CD's work is that they are hit by a laser beam which is reflected on the surface of the disc. These disks have some valleys and mountains that reflect light differently so the CD player will interpret these differences in reflection as data which will then be turned into music, videos or computer files.
Given that the mass of a liquid is 0.01kg and the volume of the liquid is 0.05m^3 . Calculate the density of the liquid
A) 2kg/m^3
B)0.2kg/m^3
C) 5kg/m^3
D) 0.5kg/m^3
Answers
Answer:
B.
Explanation:
Density = mass / volume
= 0.01/0.05
= 0.2 kg/m^3.
In Ørsted’s observation, the current-carrying wire acted like a
. Michael Faraday based his first invention, the
, on Ørsted s observation.
Answers
In Ørsted’s observation, the current-carrying wire acted like option B)magnet
Michael Faraday based his first invention, the C) motor, on Ørsted s observation.
What did Oersted and Faraday find, respectively?The two laws that relate electricity and magnetism the other being Faraday's law of induction were originally discovered as a result of rsted's discoveries. These two rules were incorporated into Maxwell's equations, which control electromagnetic.
Note that When a magnetic compass needle was brought in close proximity to a wire carrying current, Oersted noticed that it dramatically deflected. Since of this result, he came to the conclusion that a wire can function as a magnet because moving charges in the form of a current possess a certain magnetic field.
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See correct question below
In Ørsted’s observation, the current-carrying wire acted like a
A)generator
B)magnet
C)motor
Michael Faraday based his first invention, the (______),on Ørsted s observation.
A)electromagnet
B)generator
C)motor
How much time does it take a person to walk 12 km north at a velocity of 6.5km/h?
Answers
D= 12 km
V= 6.5
12/6.5 = 1.84 s
meaning of anode and cathode
Answers
Answer:
An anode is an electrode through which conventional current (positive charge) flows into the device from the external circuit, while a cathode is an electrode through which conventional current flows out of the device.
Explanation:
if the mass of a ball of a table of 3 m is 50 kg find the balls potential energy.
Answers
Answer:
The potential energy of the ball is 1471.5 joules.
Explanation:
To calculate the potential energy of the ball, we used the formula.
\(PE = m * g * h\)
where m is the mass of the object, g is the acceleration due to gravity, and h is the height above the ground. Substituting the given values of a 50 kg ball placed on a table at a height of 3 meters above the ground, we plugged in these values into the formula. By simplifying the equation, we found that the potential energy of the ball is 1471.5 joules. Therefore, the potential energy of the ball is 1471.5 joules when it is placed on a table at a height of 3 meters above the ground.
A person next to a fireplace feels warm. How is the heat transferred to them?
Answers
Answer:
RADIATION TEEHEE MERRY CHRISTMAS
Explanation:
What are three modern inventions that could not have been invented without the earlier contributions of sir isaac newton?.
Answers
Answer:
there are the three basic
first law also called the law of inertia
the second one is the second law of motion and its equation is
F = ma
where m is the mass and a is the acceleration
its SI units are mass is kg and Acceleration is m/\(s^{2}\)
the third law is called the action-reaction law
also the law of gravitation in which we survive our own earth-like plane due to the basic concept of the law of gravitation because the idea of gravitation is deal with this important law
F=GmMe/\(R^{2}\)
The G value is 6.673*10^-11
m is the mass of an object
Me is the mass of the earth in our case we consider the object and the earth.
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El peso(w) de una persona en la Tierra es 550N. Determinar la masa (m) de la persona y el peso (w) de la misma en la Luna
Answers
The question is: The weight (w) of a person on Earth is 550N. Determine the mass (m) of the person and the weight (w) of the person on the Moon.
Answer: The mass (m) of the person is 550 N and the weight (w) of the person on the Moon is 891 kg.
Explanation:
Given: Mass = 550 N
When a person moves towards moon then its mass will remain the same but there will occur change in its weight because the acceleration due to gravity on moon is different than that on Earth.
Therefore, formula used to calculate the weight of person on moon is as follows.
\(W = m \times g_{m}\)
where,
m = mass
\(g_{m}\) = acceleration due to gravity on moon = 1.62 \(m/s^{2}\)
Substitute the values into above formula as follows.
\(W = m \times g_{m}\\= 550 N \times 1.62 m/s^{2}\\ (1 N = 1 kg \times m/s^{2})\\= 891 kg\)
Thus, we can conclude that the mass (m) of the person is 550 N and the weight (w) of the person on the Moon is 891 kg.
how is light reflected from a prism
Answers
Answer:
White light entering a prism is bent, or refracted, and the light separates into its constituent wavelengths. Each wavelength of light has a different colour and bends at a different angle. The colours of white light always emerge through a prism in the same order—red, orange, yellow, green, blue, indigo, and violet.
A sealed cylinder of length l and cross sectional area A contains n molecules of an gas at kelvin temperature T. What is the force acting on the cylinder marked A due to the gas?
A. NRT/l
B. NRT/lA
C. NkBT/lA
D. NkBT/l
I know it has to be option D but I have no idea how to get to that answer.
Answers
At kelvin temperature T, cylinder A includes n molecule of a gas, and the force exerted by the gas on the cylinder is NkBT/l.
Force is what?When two bodies interact, it refers to any form of pushing or pulling that one body exerts on the other. A vector quantity, that is. For instance, a person pushes or pulls on something to provide force, such as opening a door.
What variety of forces exist?Contact forces that act at a remove forces are the two different types of forces. Your daily use of force is evident. Basically, pressure and pull are forces.
Briefing:Formulas,
-P = F/A
-n = n/Na
-PV = nRT
= NKT (R = KNa)
- Volume of cylinder: A* l
F=PA
P = NKbT / V
P = NKbT / A* l
F = NkBT / A * l (A)
Cross out A,
Final, F = NkBT/l.
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The orbital motion of a deep water wave extends to a depth equal to.
Answers
How does an electric generator work? the axle rotates the armature in the magnetic field of a permanent magnet, which induces an electric current. the armature rotates the axle in the magnetic field of a permanent magnet, which induces an electric current. the axle rotates the armature in the magnetic field of an electromagnet, which induces an electric current. the armature rotates the axle in the magnetic field of an electromagnet, which induces an electric current.
Answers
The armature rotates the axle in the magnetic field of an electromagnet, which induces an electric current defined that es the working of an electric generator.
What is an electric generator?An electric generator is physically equivalent to an electric motor, but it converts mechanical energy into electrical energy using a reversed flow of power.
When strong magnets are used, a strong flux is produced, and the motor becomes more powerful. Internal flux has a significant impact on coil strength.
Increasing current results in greater power. In the same way, shortening the distance between magnets makes the motor stronger by increasing flux and torque.
The armature rotates the axle in the magnetic field of an electromagnet, which induces an electric current defined that es the working of an electric generator.
Hence option D is correct.
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Answer:
d
Explanation:
edge 2022