The velocity with which the feather strikes the ground of the planet is 7.63 m/s and the acceleration due to gravity on the surface of the planet is 5.125 [tex]m/s^{2}[/tex].
As from the surface of the planet, under acceleration due to it's gravity, the feather takes 1.49 seconds to reach the bottom-end when dropped into a 69m deep crater.
As the motion of the feather dropped would follow the freefall conditions, we should first know the basic equations of motion:
(Assuming u as the initial velocity, [tex]v[/tex] as the final velocity, [tex]t[/tex] as time, s as displacement and [tex]a[/tex] as the acceleration due to gravity in the equations)
s = u[tex]t[/tex] + 1/2 [tex]a[/tex][tex]t[/tex]² .......(i)
[tex]v[/tex]² = u² + 2[tex]a[/tex]s .......(ii)
[tex]v[/tex] = u + [tex]a[/tex][tex]t[/tex] .......(iii)
The sign convention should be followed according to the given data.
For the question, u = 0 since the feather is dropped
s = 5.69 m;
[tex]t[/tex] = 1.49 s
Putting the values in equation (i)
5.69 = 1/2 a × 1.49 × 1.49
11.38 = a × 2.2201
a = 5.125 [tex]m/s^{2}[/tex]
Hence, the acceleration due to gravity for the planet is 5.125 [tex]m/s^{2}[/tex]
Now, putting the values of a and t in equation (iii), we get
[tex]v[/tex] = 5.125 × 1.49
= 7.63 m/s
Hence, the feather hits the bottom of the crater at the speed of 7.63 m/s.
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The correct question is:
An astronaut on planet with no atmosphere drops feather into a 5.69m deep crater and records that the feather falls freely for 1.49s. What is magnitude of free-fall acceleration on the planet? With what speed does the feather strike the bottom of the crater?
What is the equation of this trend line?
The equation of the trend line is a linear equation of the form y = mx + b, where m is the slope and b is the y-intercept.
Calculating the Equation of a Trend LineThe equation of the trend line is a linear equation which describes the relationship between the two variables represented in the graph. The equation takes the form y = mx + b, where m is the slope of the line and b is the y-intercept. The slope of the line is calculated by finding the change in the y-values divided by the change in the x-values of two points on the line. The y-intercept is the point at which the line crosses the y-axis. To complete the equation, both m and b must be calculated.
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the blue line of the hydrogen emission spectrum has a wavelength of 433.9 nm.calculate the energy of one photon of this light.
The energy of one photon of the blue light of wavelength 433.9 nm is 4.58×10⁻¹⁹ J or 2.857 eV.
The relation between energy and wavelength can be derived from Plank's equation.
E = hυ
h is plank's constant and υ is the frequency.
Frequency and wavelength is related as
c = υλ,
c is the velocity of light in vacuum
υ is the frequency and λ is the wavelength
From that, υ = c/λ
Substituting in the equation of energy,
E = hυ = hc/λ
h= 6.626 ×10⁻²⁶
c = 3× 10⁸
λ = 433.9 nm = 4.339 ×10⁻⁷ m
Substituting the values,
E = ( 6.626 ×10⁻²⁶ × 3× 10⁸) / 4.339 × 10⁻⁷
= 4.58 × 10⁻¹⁹ J = 2.857 eV.
So the energy of one photon is 4.58 × 10⁻¹⁹ J or 2.857 eV.
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Which type of acceleration should you use when accelerating on a short highway entry ramp.
The lowest level of acceleration is the best option when accelerating on a short highway entry ramp
Why use the lowest level of acceleration on a short highway entry way?When you are entry a highway ramps, you will have different speed with the traffic on the highway which is mean you have to determine whether you can join the traffic or not in the meantime. In order to make the best decision, you to slowdown so you can determine it carefully. This also can prevent accident happen to you because you can hit the brakes or dodge when unexpected event is happening.
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If an object is tossed up vertically, when in its flight before it hits the ground is its velocity zero? Explain why this is true.
The velocity before the object hits the ground is not zero due to acceleration due to gravity.
What is the velocity of the object?We know that the object that is thrown up would experience the force of gravity that acts on it. As the object is moving up, there is a decceleration due to gravity that acts on the object and the velocity of the object would eventually get to zero at the maximum height.
When the object is coming down, the object would be accelerated due to gravity such that the velocity of the object would begin to increase again and it would hit a maximum when the object falls to the ground.
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What is the product of force and lever arm distance which tends to produce or change rotation called?
The product of force and lever arm distance which tends to produce or change rotation called torque.
Torque is a unit of measurement for the force that can cause an object to revolve about an axis.
A force applied perpendicular to a lever arm produces a torque, which is the result. The distance that runs perpendicularly from the pivot point, or the centre of rotation, to the location where the force is delivered, is known as the lever arm or moment arm. A pivot point is always used to define a torque.
Each gearing stage of a torque multiplier amplifies the torque applied to the bolt. For instance, a torque multiplier with a 5:1 ratio will produce an output at the shaft that is five times the torque, but because no energy can be produced, the speed will only be one fifth of the original.
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Which has a greater velocity? a ball rolling down a 3. 4m hill in 8. 5s or a fish swimming upstream, covering 6. 2m in 0. 6 minutes?.
The ball moving for 3.4m distance for 8.5 secs time has greater velocity than the fish moving for 6.2m distance for 36 secs time.
Kinematics is the branch of physics dealing with the motion of an object, without regard to the cause of this motion. It includes distance and displacement, speed and velocity, time, and acceleration. The same quantities are used in linear as well as angular or rotational motion.
We have two objects given to us, a ball and a fish. First, the ball, the displacement,d₁ the ball travels=3.4m, the time t₁ taken by the ball =8.5s.
Its velocity, v₁=d₁/t₁ , v₁=3.4m/8.5s, v₁=0.4m/s. Secondly, for the fish, the displacement that the fish travels, d₂ =6.2 m, the time taken by the fish,t₂ =0.6 minutes =0.6×60=36 seconds.
The time taken by the fish is converted from minutes to seconds, as 1 minute = 60 seconds. The velocity of the fish is v₂=d₂/t₂, v₂=6.2m/36s=0.172m/s.
So we can conclude that the ball has greater velocity(v₁=0.4m/s) than the fish ( v₂=0.172m/s).
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what is the minimum hose diameter of an ideal vacuum cleaner that could lift a 15 kg dog off the floor?
The minimum hose diameter of an ideal vacuum cleaner that could lift a 15 kg dog off the floor is calculated to be 0.043 m.
Given that,
Mass of the dog = 15 kg
We know, F = m g
So, F = 15 × 9.8 = 147 N
Air pressure P = 1.013 × 10⁵ N/m²
We know, P = F/A
where, P is pressure
F is force
A is area
Let us find out A, by making A as subject,
A = F/P = 147/(1.013 × 10⁵) = 14.51 × 10⁻⁴ m²
To find the diameter of the hose, A = π d²/4
14.51 × 10⁻⁴ = π d²/4
4× 14.51 × 10⁻⁴ = π d²
d² = (4× 14.51 × 10⁻⁴)/π
d = √(18.49× 10⁻⁴) = 4.3 × 10⁻² m = 0.043 m
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ursa major solar is converting a lead and needs to capture custom lead data on the converted contact what should
It should set up a custom field or form that captures the necessary data related to the converted contact. This could be done using a CRM (Customer Relationship Management) system, or through custom-built forms. The data should be stored in a secure, central location to ensure the integrity of the data.
What is the Customer Relationship Management?The management of contacts with clients and future consumers is the main goal of the business approach known as customer relationship management (CRM). It involves coordinating sales, marketing, customer service, and technical support via the use of technology. CRM's primary objectives are to boost customer happiness and loyalty, as well as sales and profitability. CRM systems may be used to manage contacts, store customer information, monitor leads, and provide reports. CRM may also be used to automate marketing campaigns, monitor consumer behavior, and offer customised customer experiences.
In order to capture custom lead data, Bursa Major Solar should create a form that would ask the converted contact for their name, email address, phone number, address, and any other personal information that could be gathered. This form should also include a dropdown menu with a list of options that could be used to categorize the lead. For example, the options offered could include “Residential”, “Commercial”, “Government”, and “Other”. The form should also include fields for the lead to provide more specific information about their needs, such as the type of solar system they are interested in, the size of their property, and their budget. Finally, the form should allow the converted contact to sign off on the terms and conditions of the sale, which should be clearly and concisely laid out for them.
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The complete question is: An Administrator at Ursa Major Solar is converting a lead and needs to capture custom lead data on the converted contact. What should the administrator do to accomplish this goal?
Why did many ancient greek astronomers believe in a geocentric explanation of our universe?
Many ancient greek astronomers believe in a geocentric explanation of our universe because they believed that we revolves around the sun.
Man has always been captivated by learning about the universe's beginnings. Similar to this, man has frequently been impacted by his creationist beliefs, which hold that the universe and everything in it were created by a supreme being. For instance, some of the oldest known hypotheses about the creation of the cosmos were created by the Ancient Greeks. Unfortunately, a lot of ancient Greek astronomers and philosophers positioned the Earth in the center of their universe models. They reasoned that the cosmos must be geocentric—that is, the Earth must be in its center—if the skies are divine and the gods created man.
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As shown in the figure, two blocks are connected by a very light string, and the upper block is pulled upward by a different string. The masses of the upper and lower blocks are 300 g and 240 g, respectively. The string between the blocks will break if its tension exceeds 3.6 N, and the string that pulls the combination upward will break if its tension exceeds 7.8 N.
(a) What is the largest upward acceleration that the blocks can be given without either string breaking?
(b) If the upward acceleration is slightly higher than this, which string breaks, the upper one or the lower one?
For strings between blocks:
(a) The largest upward acceleration is 0.014 m/s²
(b) The string between the two blocks break.
How to calculate tension?To find the largest upward acceleration, the tension in the string between the blocks is equal to the gravitational force acting on the lower block. The tension in the string pulling the combination upward is equal to the gravitational force acting on the combination.
a) The gravitational force acting on the lower block is the weight of the lower block (mass x acceleration due to gravity) = (240g x 9.8m/s²) = 2352 N.
The gravitational force acting on the combination is the weight of the combination (mass x acceleration due to gravity) = (540g x 9.8m/s²) = 5292 N.
Since the tension in the string between the blocks must not exceed 3.6 N, and the tension in the string pulling the combination upward must not exceed 7.8 N, the largest acceleration on the blocks without breaking either string is:
a = (3.6 N + 7.8 N) / 540 g = 0.014 m/s²
b) If the acceleration is slightly higher than this, the string that breaks is the one between the two blocks, as it is already under a lower tension than the string pulling the combination upward.
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you are familiar with the principle of superposition as applied to the electric fields of a collection of point charges. we may apply this principle to extended charge distributions as well. for this problem, model each charged object as a collection of many individual charges, then use symmetry arguments in order to reason out your answer. for which configuration(s) does the total electric field vector at the origin have nonzero components in the x direction as well as the y direction (i.e., both x and y components are non-zero)?
The electric field vector at the origin will have non-zero x and y components if the charges are distributed in a non-symmetric manner around the origin.
The principle of superposition can be applied to the electric fields of a collection of point charges and extended charge distributions.
To answer this problem, we must model each charged object as a collection of many individual charges and then use symmetry arguments to determine the total electric field vector at the origin.
For the configurations where the total electric field vector at the origin has nonzero components in both the x and y directions, the charges must be distributed in a non-symmetric manner about the origin.
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a boy shoots a section-cup dart at a refrigerator where it sticks. if the suction cup has a diameter of 0.5 inches when stuck, what force in lbf is required to pull it straight off?
The force required to pull a suction cup off of a surface is determined by the adhesive strength of the suction cup and the surface it is attached to, as well as the size of the suction cup.
The larger the suction cup, the more force is required to remove it. In this case, with a suction cup diameter of 0.5 inches, the force required to pull it straight off of a refrigerator would likely be relatively small.
It's important to note that the suction cup is designed to stick to a smooth surface and the force required to pull the suction cup off is directly proportional to the area of the suction cup in contact with the surface.
The force required to pull the suction cup off can be calculated using the following formula: Force = (Adhesive strength of suction cup × Area of suction cup) / (Coefficient of friction between suction cup and surface).
In conclusion, the force required to pull the suction cup dart off the refrigerator depends on the adhesive strength of the suction cup, the size of the suction cup, and the coefficient of friction between the suction cup and the refrigerator surface.
Without the exact values of these parameters, it's difficult to give an exact value of the force required. But it's likely to be relatively small as the suction cup is small and it's designed to stick to a smooth surface.
Also, the force required will depend on how the boy has shot the dart and how it's adhered to the surface. In any case, the force required is not likely to be significant enough to cause damage to the refrigerator.
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What is the change in entropy of the system when the flask of hexanes is boiled?
Need a refresher? Head over to action and review Thermodynamics
A. Negative
B. Zero
C. Positive
Positive change in entropy of the system when the flask of hexanes is boiled.
In this case, Option C is correct
What is thermodynamics?
Thermodynamics is the branch of physics that deals with the relationship between heat and other forms of energy. It studies how energy is converted into different forms, and how it affects matter and life. It also examines the laws which govern energy transfer and the resulting changes in matter. Thermodynamics is a key part of understanding many natural phenomena, such as the flow of heat through the Earth's atmosphere and oceans, and the behavior of stars and galaxies.When a flask of hexanes is boiled, the entropy of the system increases. This is because the boiling of the hexanes causes the molecules to become more disordered and spread out, increasing the number of microstates in the system. This is the opposite of what would happen if the flask were to be cooled, in which case the entropy of the system would decrease. Thus, the change in entropy of the system when the flask of hexanes is boiled is positive.To know more about thermodynamics click-
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the position in metres of an object moving in a straight line is given by s (t) =4t²+3t+4 where t is measured in seconds. what is the equation for a) Instantaneous velocity v (t) b) Instantaneous acceleration a (t) c) v (t) at 3s, 4s and 0.5s d) a (t) at is 7s and 0s
The instantaneous angular position of a point on a rotating wheel is given by the equation θ(t)=2t3−6t2. The torque on the wheel becomes zero.
What is acceleration?Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing. For all other kinds of motion, both effects contribute to the acceleration.Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity. Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.To learn more about velocity refer to:
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evidence card 3: attracting magnets it was harder to pull the magnets apart when they were close together
What affects the amount if potential energy stored in the magnetic field when a magnet is moved against a magnetic force?
The amount of potential energy stored in the magnetic field when a magnet is moved against a magnetic force is affected by the distance through which the field is moved.
What is the potential energy stored in the magnetic field?
The potential energy stored in the magnetic field is defined as the amount of work done in rotating the dipole from zero potential energy position to any desired position.
Mathematically, the formula for the potential energy stored in the magnetic field is given as;
U = ( GM / R )
where;
G is the universal gravitation constantM is the massR is the distance of the magnetic field from the magnetic forceThus, the distance between the magnetic field and magnetic force affects the amount of energy stored in the magnetic field.
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it takes the earth approximately 365 normal days to orbit the sun. using this information and assuming 24 hours in a normal day, approximately how many nanoseconds does it take for the earth to orbit the sun?
According to question, 3.15 x 1016 nanoseconds it take for the earth to orbit the sun .
Similar to how the Earth orbits the Sun, the Moon is a ball of rock that revolves around the Earth. It is substantially smaller than the Earth and completes one orbit in 28 days. The Earth orbits the sun while revolving on its axis. The Earth completes one full rotation of the sun in a little over 365 days.
The Moon orbits Earth in about one month (27.3 days to complete a revolution, but 29.5 days to change from New Moon to New Moon). Both Earth and the Moon are circling the Sun as the Moon completes each 27.3-day orbit around Earth.
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which of the body's energy systems kicks in to provide the energy during the first 2 to 3 minutes of movement?
The Phosphagen system is the body's energy system that kicks in during the first 2 to 3 minutes of activity to give energy. The anaerobic Phosphagen system utilises stored energy in the form of adenosine triphosphate (ATP) and creatine phosphate (CP) to supply energy for brief bursts of activity.
What is Phosphagen system?An anaerobic energy source called the phosphagen system gives energy for brief bursts of activity. To supply energy for quick muscular contractions, it utilises the energy stored in adenosine triphosphate (ATP) and creatine phosphate (CP). Muscle contractions are primarily powered by ATP, and CP is a high-energy molecule that restores ATP. Sprinting, weightlifting, and leaping are examples of activities that utilise the phosphoglycen system as their major energy source for up to 10 seconds.
It relies on a molecule called ATP (adenosine triphosphate) and phosphocreatine (PCr) to generate energy. ATP is the "currency" of energy, providing the body with a quick burst of energy when needed. PCr is the high-energy molecule that is stored in the muscle and can be broken down to regenerate ATP for use. This system is able to regenerate ATP quickly, allowing for short bursts of intense activity such as sprinting, jumping, and weightlifting. It is most efficient in the first 2-3 minutes of movement due to its ability to quickly regenerate ATP and provide energy.
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what do magnetic field lines look like when two magnets repel?
Answer is on the explanation part
If you have two magnets close to each other and their polar region are facing each other or there on the west side when facing the north poles are embroidery each one, you can visualize that the field lines move away from each other, so you feel a repulsing force 'tween two together magnets and the field lines bend away from each other.When two polar regions are beginning together, the magnetic field of current lines repulses each one, and two together magnets experience an offensive force. The alike happens if two on the west side when facing the north poles are beginning together. If opposite poles are approached together, the magnetic field of currents lines enhance thicked 'tween the poles and the magnets occurrence is an attractive force.Like the energetic field, the magnetic field of currents is more forceful place foul lines are denser. Accordingly, middle of two points two together polar regions, the magnetic field of currents is very weak cause the mass of the magnetic field of currents is nearly nothing. A compass placed at that point would spin freely if we neglect Earth’s magnetic field of currents. Contrary, the magnetic field of currents lines between the northward and cold poles are very thick, signifying that the magnetic field of currents is very forceful in this domain. A compass established in this place would fast join with the magnetic field of currents and point to the south pole.read more on magnetic fields
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A ball is dropped from rest from a height of 1. 88 m. How long does it take to strike the ground? (use g = 10 m/s2).
It takes 0.613 seconds for the ball to strike the ground after it is dropped from rest from a height of 1.88 m.
To determine how long it takes for a ball dropped from rest to strike the ground, we can use the equation:
t = √(2*d/g)
where t is the time it takes for the ball to strike the ground, d is the distance the ball falls, and g is the acceleration due to gravity.
Given that the ball is dropped from a height of 1.88 m, and that g = 10 m/s^2, we can substitute these values into the equation:
t = √(2*1.88 m/10 m/s^2)
t = √(0.376)
t = 0.613 s
Therefore, it takes 0.613 seconds for the ball to strike the ground after it is dropped from rest from a height of 1.88 m.
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Lucy stands on a stepladder to place a fridge magnet at the top of her fridge door. Which of the following energy stores does the magnet have energy in?
Lucy stands on a stepladder to place a fridge magnet at the top of her fridge door. The magnet have potential energy in.
What is potential energy?Potential energy in physics is the energy that an item retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.
The gravitational potential energy of an item is a examples of common types of potential energy.
As Lucy stands on a stepladder to place a fridge magnet at the top of her fridge door, the magnet have gravitational potential energy in.
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A bullet is fired through a board 10 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 300 m/s, what is the total time the bullet is in contact with the board? Label your answer. To write an exponent in your answer, please type it like this: 10^3.
The total time the bullet is in contact with the board is 8 x 10^-5 seconds
How to calculate?V1 = 400ms − the initial velocity of the bullet;
V2 = 300 ms− final velocity of the bullet;
d = 10cm = 0.1m − thickness of the board;
a − acceleration inside the board.
t − total time that the bullet is in contact with the board
To find the total time that the bullet is in contact with the board we can use formula :
t = V1 -V2 / a
where a has been found to be 1.25 x 10^6 m/s²
Substituting the values, we have that total time that the bullet is in contact with the board = 8 x 10^-5 seconds
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With which class of levers is it possible to increase the force that must be applied? (1 point)
O Class 1 and 3
O Class 3 and 4
O Class 2 and 3
Class 1 and 2
Answer:
1.
A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way.
Answer: 3; 2; 1
2.
A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force is 5 meters from the fulcrum. What is the mechanical advantage?
Answer: 3
3.
With which class of levers is it possible to increase the force that must be applied?
Answer: Class 1 and 3
4.
600 Joules of work is used to lift a box from the ground to a height of six meters. How much work would have been done if a lever would have been used with an effort arm of 12 meters and a load arm of 6 meters?
Answer: 600 J
5.
A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400 Joules of work is done, how much force must have been applied?
Answer: 100 N
Explanation: took the test
Answer:
(Question)
A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way.
(Answer)
3;2;1
(Question)
A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force is 5 meters from the fulcrum. What is the mechanical advantage?
(Answer)
3
(Question)
With which class of levers is it possible to increase the force that must be applied?
(Answer)
class 1 and 3
(Question)
600 Joules of work is used to lift a box from the ground to a height of six meters. How much work would have been done if a lever would have been used with an effort arm of 12 meters and a load arm of 6 meters?
(Answer)
600 J
(Question)
A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400Joules of work is done, how much force must have been applied?
(Answer)
100 N
Explanation:
i just did the quick check UwU
in terms of the scientific method, how does astronomy differ from a lab science like chemistry or biology? how can astronomers be confident of their understanding of objects that are remote from the earth?
Astronomy differs from lab sciences like chemistry or biology in that it is an observational science.
This means that astronomers primarily gather data through the use of telescopes and other instruments to observe objects in space, rather than performing experiments in a laboratory setting.
One of the main challenges in astronomy is that the objects being studied are often extremely distant and difficult to observe directly.
However, astronomers have developed a variety of techniques to study these objects, such as analyzing the electromagnetic radiation they emit, studying their motions and positions, and using computer simulations to model their behavior.
Astronomers can be confident in their understanding of remote objects by using multiple methods to study them and by comparing their results to existing theories and models.
They also use statistical analysis to quantify the uncertainty of their measurements and observations.
In conclusion, while astronomy shares some similarities with lab sciences, it differs in that it is an observational science and the objects being studied are remote.
Astronomers overcome these challenges by using a variety of techniques and by cross-checking their results with existing theories and models.
They also quantify the uncertainty of their measurements and observations to ensure the confidentiality of their understanding of remote objects.
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How do you find the cross product of two vectors with right hand rule?
The cross product of two vectors is perpendicular to the both the vectors, which is easily determined by the right hand rule.
Right hand rule is used to determine the direction of the vector that is cross product of two vectors. If we point our right hand's index finger in the direction of vector a, and middle finger in the direction of vector b, then our thumb will indicate the direction of the c, which is the cross product of vectors a and b. We should not that, (a×b) ≠ (b×a)
If a×b = c, then the direction of vector C would be perpendicular to both the vectors.
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Fill in the missing for each of the statements below:
Answer:
Explanation:
a. thermal
b. waste
c. chemical, electrical
d. efficiency
how long will it take a person on a skateboard to travel 45 m and attain a speed of 7 m/s from rest ?
It will take a person 6.42 second on a skateboard to travel 45 m and attain a speed of 7 m/s from rest .
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
Acceleration of the ball is = (7 m/s)²/45 m = 1.09 m/s²
Hence, time taken to attain the speed = 7 m/s ÷ 1.09 m/s² = 6.42 second.
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Drag each tile to the correct location in the sequence.
The table shows chronological events in the life of our Sun, a medium-sized star. Place the missing events into the correct rows of the table.
The Sun is a white dwarf with a
dim glow.
A nebula located in the Milky Way
galaxy begins pulling nearby
hydrogen atoms into its orbit.
The temperature in the core of the
nebula reaches 14 million Kelvin.
The Sun expands greatly and cools.
It is larger and redder.
Our Milky Way formerly lived a life that was very eventful: between 13 and 8 billion years ago, it led a life of frenzied activity, merging with other galaxies and devouring a lot of hydrogen to create stars.
What are Chronological events?Maosheng Xiang and Hans-Walter Rix from the Heidelberg-based Max Planck Institute for Astronomy have recreated the tumultuous adolescence of our galaxy using fresh data.
The exact ages of 250,000 Milky Way stars have to be determined by the researchers in order to accomplish this.
A few more mergers with galaxies that were somewhat smaller than the Milky Way also occurred. They shook things up and produced the so-called star halo that surrounds the Milky Way disk.
Therefore, Our Milky Way formerly lived a life that was very eventful: between 13 and 8 billion years ago, it led a life of frenzied activity, merging with other galaxies and devouring a lot of hydrogen to create stars.
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water flows through a 2.9-cm -diameter hose 3.5 m/s . how long, in minutes, will it take to fill a 600 l child's wading pool?
The time taken by a 2.9cm diameter water hose to fill the 600-liter pool is 4.58 minutes.
The diameter of the hose, d =2.9 cm. Velocity, v=3.3 m/s= 330 cm/s. The amount of water following through the cross-sectional area of the hose = πr². Diameter = 2.9 cm so radius, r=1.45 cm. A= 3.14×2.10 = 6.601 cm². The cross-sectional area of the hose is approximately 6.601 cm². To the volume of water that flows through the hose each second, multiply its velocity by the cross-sectional area of the hose. Volume/ second = 330×6.601=2178.61 cm³/sec . There are 1000 cm³ in one liter. Total volume =600×1000 =600000 cm³. To determine the time in seconds, divide the total volume by the volume per second, t = 600000/2178.61 =275.40 sec. This is roughly 275 seconds. Now convert 275 seconds into minutes, t (mins) = 275/60 =4.58 minutes.
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a ball is thrown vertically upward with a speed of 13 m/s . determine the time of flight when it returns to its original position.
The time taken to reach the original flight means the time taken for the upward and downward flight. The total time taken for the ball to return to its starting position would be 2.6 s.
Lets calculate the time taken for the flight upwards. As per the kinematic equations,
v = u + at
v is the final velocity, u is the initial velocity.
Here a will be the acceleration due to gravity, t is the time of flight.
0 = 13 + -10t ( we consider g as 10, for the ease of calculations, it is negative because the ball is going up)
t = 13/10 = 1.3 s
By theory the time taken for the upward flight will be equal to the time for the drop. So total time would be double the time taken for the upward flight.
So total time of flight = 2 × 1.3 = 2.6s
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1. What is absolute zero?(1 point)
Zero on any temperature scale.
The coldest achievable temperature for a given substance.
The temperature of outer space.
The point at which particle motion completely stops.
2. If hydrogen could be held at absolute zero, what would its form be?(1 point)
Liquid
Superfluid
Solid
Gas
3. As researchers cool a substance close to absolute zero, what happens?(1 point)
The work needed to cool it further decreases, becoming easier.
The work needed to cool it further falls to zero.
The work needed to cool it further increases.
Work is done on the environment by the substance.
4. Why can’t absolute zero be achieved?(1 point)
Technology isn’t capable of it yet.
Supercold superfluids have no friction.
We can’t describe an absolute value of cold.
It would require infinite work done on the substance.
The correct answers are:
Absolute zero is option A:The coldest achievable temperature for a given substance.SolidThe work needed to cool it further increases.It would require infinite work done on the substance.What is the temperature scale?Absolute zero is the coldest temperature possible, the point at which the thermal motion of all particles comes to a complete stop. At absolute zero, hydrogen would be in a solid form
As researchers cool a substance close to absolute zero, the work needed to cool it further increases as the substance gets closer to absolute zero.
Therefore, Absolute zero cannot be achieved because it would require infinite work done on the substance, which is impossible according to the Third Law of Thermodynamics.
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