Observables of certain elliptical galaxies with shells of stars surrounding them that are likely developed from stars ripped out of smaller galaxies is the evidence supports the idea that a collision between two spiral galaxies might lead to the creation of a single elliptical galaxy.
That most of the galaxy populations at the centers of dense clusters of galaxies are made up of elliptical galaxies, studies of a few eccentric galaxies with central stars and gas clouds that orbit differently from the galaxy's other stars. Observations of massive, elliptical galaxies that may have developed by consuming other galaxies at the heart of dense clusters. A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together. The name comes from the Greek word galaxias, which means "milky" and refers to the Milky Way galaxy, which houses the Solar System. Galaxies, which contain an average of 100 million stars, range in size from dwarfs, which contain fewer than 100 million stars, to supergiants, which contain 100 trillion stars, all of which orbit the galaxy's center of mass. Only a small percentage of the mass in a normal galaxy is visible in the form of stars and nebulae; the majority of the galaxy's mass is dark matter. Supermassive black holes are a typical component of galaxy centers.
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Question: An organiser of a bungee jumping competition changes the length of the bungee rope so different people can use the rope safely. Use your idea of forces to describe how the size of a person affects the rope when they jump.
An organiser of a bungee jumping competition changes the length of the bungee rope so different people can use the rope safely because high weight can cause the rope to stretch and break.
When a person jumps, their size impacts the bungee rope since their weight causes the rope to expand different manner. The force of a person's body weight causes the bungee rope to lengthen when they jump, and the degree of stretching depends on their mass. Since the force of the weight is greater, a bigger person will stretch the rope more than a lighter one. Due to this phenomenon, extra stretching of a rope can lead to breaking which can cause life hazards. Therefore, the organizer changes the length of the bungee rope.
For example, if an adult weighs twice as much as a kid, the bungee rope will stretch twice more than the kid's leaps. This is because the adult's weight is twice as much as the child's weight, so the force of the adult's weight will be twice as great, causing the rope to stretch twice as much.
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How does changing the amplitude affect the wave speed
Answer:
sigh
Explanation:
Let's explain this in math terms. A=x A>y a=c right? So then, Y>x but X=C+Y. Then A<A. Whats the answer?
a block with a mass of 1.5 kg is set atop a vertical spring compressed 0.75 m. when the spring is released, the block flies upward and achieves a speed of 2.5 m/s at a height of 1.4m. what is the spring constant of the spring?
The spring constant of the spring to which a block is attached and spring is compressed initially and then released is 16.67 N/m.
Energy is being transferred from one form to another form and follows conservation of energy.
Mathematically,
" 1/2 * k * x² = 1/2 * m * v² "
where, k is the spring constant = ?
Compression of the spring = 0.75 m
m is Mass of the block = 1.5 kg
v = velocity of the block = 2.5 m/s
Placing values in above equation, we get,
1/2* k * (0.75)² = 1/2* (1.5)* (2.5)²
k * (0.75)² = (1.5)* (2.5)²
k = [(1.5)* (2.5)²]/(0.75)² = 9.375/0.5625 = 16.67 N/m
Thus, the spring constant of the spring is 16.67 N/m.
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if a neutron moves with a speed of 0.99c, what are its (a) total energy, (b) rest energy, and (c) kinetic energy?
If a neutron moves with a speed of 0.99c, its total energy is 1.07nJ, the rest energy is 0.15nJ , and kinetic energy is 0.92nJ
Given speed of neutron (v) = 0.99c
Mass of neutron = 1.674*10-27 kg
Total energy = Rest energy +Kinetic energy
Let the Rest energy be E = mc^2
E = 1.674*10-27 kg x (3x10^8)^2 = 0.15nJ
E = 939.32MeV
Total energy (Er) = γmc^2
where γ = 1/√1-(v/c)^2
Er = E/√1-(v/c)^2 = 939.32/√1-(0.99/3x10^8)^2
Er = 939.32/√1-0.9801 = 939.32/0.1411 = 6657.12MeV = 1.07nJ
Kinetic energy ( KE) = Total energy(Er) - rest energy(E)
KE = 1.07 - 0.15 =0.92nJ
Hence the rest energy of neutron is 0.15nJ while the total energy is 1.07nJ and kinetic energy is 0.92nJ
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a brass plug is to be placed in a ring made of iron. at 15oc, the diameter of the plug is 8.755 cm and that of the inside of the ring is 8.741 cm. they must both be brought to what common temperature in order to fit?
To fit, they must both be chilled to -150 °C from a starting temperature of 20 °C.
What is the physics formula for diameter?The diameter is actually made up of two parts, each of which is a radius. Thus, the diameter formula is: Diameter = 2 the radius measurement. This equation can be expressed quickly as d = 2r.
Why is it referred to as a diameter?The radius is the length from the center to any point on the surface. In a similar manner, the diameter of a circle is defined as the distance traversed by two points on its surface through its center. In other words, the radius and diameter are equal.
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an observer stands 700 ft away from a launch pad to observe a rocket launch. the rocket blasts off and maintains a velocity of 900 ft/sec. assume the scenario can be modeled as a right triangle. how fast is the observer to rocket distance changing when the rocket is 2400 ft from the ground?
The rate of change of observer to rocket distance is 864 ft/sec when the rocket is 2400ft from the ground.
This question can be solved using the Pythagorean theorem.
Let us assume that:
the distance between the observer and launch pad be x.
the vertical distance of rocket and the launch pad (ground) be y.
As it is given in the question that this scenario forms a right angled triangle. So let the distance BC be r as shown in figure.
We have to find the value [tex]\frac{dr}{dt}[/tex]. (rate of change of distance r)
According to the question,
AB=x= 700 ft
AC=y= 2400 ft
[tex]\frac{dy}{dt} =900 ft/sec[/tex]
By Pythagorean theorem,
[tex]x^{2} +y^{2} =r^{2} (equation 1)\\r^{2} =700^{2} +2400^2\\r=2500 ft\\[/tex]
On differentiating equation 1 we get,
[tex]2r\frac{dr}{dt} =0+2y\frac{dy}{dt} \\r\frac{dr}{dt} =y\frac{dy}{dt}[/tex]
On putting the values and solving we get
[tex]\frac{dr}{dt} =864 ft/sec\\[/tex]
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a book sits on a the tablestop. what is newton's third law pair for the force that earth exerts on the book
The forces that the book exerts on the earth because it describes the same interaction.
A book on a table exerts a downward force on the table, and the table exerts an upward reaction force on the book. The book remains stationary because the forces are equal and opposite. These forces are the earth's gravitational pull exerting a downward force and the pressure of the table against the book.
Because the force exerted by the table on the book is the same and opposite to the force exerted by the earth. Yes, action-reaction exists in this case. The book exerts a force on the table that acts on the book due to gravity. At the same time, the table exerts an equal and opposite force on the book. So the book is fixed on the table.
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an automobile with 0.370-m radius tires travels 80,000 km before the tires need to be replaced. how many revolutions do the tires make in this lifetime? neglect any change in radius due to wear.
An automobile having tires with a 0.370-m radius may drive 80,000 km before needing new tires. The tires' total amount of revolutions over their lifetime is 3x10^7
Given that radius of tire = 0.370m
Distance the tire travels (s) = 80000km = 8 x 10^7 m
the number of rotations of the tire is = n
We know that circumference of tire = 2r = 1 revolution or rotation of tire
circumference = 2x3.14x0.370 = 2.32m per revolution
Number of revolutions made = total distance / distance travelled in 1 revolution
n = 8 x 10^7/2.32 = 3.44 x 10^7
Hence number of revolutions made by the tire = 3 x 10^7
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. calculate the velocity of water at the top of the tank and through the side pipe. what principle are you using
As per Torricelli's Theorem velocity of efflux, i.e., the velocity with which the liquid flows out of a hole is equal to [tex]\sqrt{2gh[/tex]
Where h = the depth of the hole below the liquid surface.
According to Bernoulli's principle, "Within a horizontal flow of fluid, points of higher fluid speed will have less pressure than points of slower fluid speed."
The more depth the hole is, the more the velocity of the liquid that comes out of the hole. The velocity is maximum if the hole is at the bottom of the tank.
Pipe velocity is an area-averaged property independent of the pipe's cross-sectional flow distribution. It does not matter whether the flow is laminar or turbulent. Along the central axis, fluid may be traveling at twice the calculated pipe velocity.
The given question is incomplete, the related concepts has been described here for reference.
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what period do you expect to find for small amplitude swinging motion of a rock tied to a 1.0 m long string?
For small amplitude swinging motion of a rock tied to a 1.0 m long string is 2.0 s.
The length of the pendulum L = 1.0m = 100cm
Hence it is a seconds pendulum
so, its time period would be 2 seconds
[tex]\text { From } \begin{aligned}T & =2 \pi \sqrt{\frac{l}{g}} \\& =2 * 3.14 * \sqrt{\frac{1.0}{9.81}} \\& =2.0 \mathrm{~s}\end{aligned}[/tex]
The amount of time that a behavior lasts or a condition persists. Depending on the type of activity or situation under consideration, it may be measured in seconds or in millions of years.
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why keep your engine running when you wait to pick up your husband when you could just stop the engine to save gas, meanwhile, keeping your lights, air conditioning, and wipers running normally?
There are several reasons why you might want to keep your engine running when you are waiting to pick up your husband, even if you could stop the engine to save gas.
One reason is that keeping the engine running allows you to use the car's electrical systems, such as the lights, air conditioning, and wipers, without draining the battery. If you turn off the engine and use these systems, the battery will eventually drain, and you may have to jump-start the car to get it running again.
Another reason is that turning off the engine and restarting it can be hard on the engine and may reduce its lifespan. When you turn off the engine, all of the internal components come to a stop and may experience wear and tear when the engine is restarted. By keeping the engine running, you can avoid this additional wear and tear.
Finally, keeping the engine running may be more convenient and safer. It allows you to keep the car's systems running and be ready to drive at a moment's notice, which may be important if you are waiting in a potentially dangerous or unfamiliar location.
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sider the standing wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. what do these two waves have in commo
The standing wave and sound wave have the same frequency
When a guitar string is plucked or strummed, it vibrates and creates a standing wave pattern. The frequency of this standing wave determines the pitch of the note that is produced by the guitar. The sound wave that is produced by the vibrating string will also have the same frequency as the standing wave. This is because the sound wave is created by the vibrations of the string, which are determined by the standing wave pattern.
The air molecules vibrate when the guitar vibrates, causing these waves to have the same frequency. Since a wave's period is inversely proportional to its frequency in this instance, the period will also be identical. Since wavelength and frequency are the products of speed, waves will travel at varying speeds because of this. As a result, both the period and frequency are identical.
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A bookhelf i 2m long, with upport at it end(P and Q). Don't conider the weight of the bookhelf when you are anwering quetion
The book i moved o that it i 50cm from Q. Ue moment to calculate the frce at P and Q
A bookshelf is 2m long, with support at it end (P and Q). Don't consider the weight of the bookshelf. The book is moved to that it is 50cm from Q. The force at P is W/3 and Q is 2W/3.
The force at points P and Q using the concept of moments, you need to know the weight of the bookshelf and the location of the book on the shelf. The moment of a force about a point is equal to the force multiplied by the distance from the point to the line of action of the force. The line of action of a force is the straight line through which the force acts. In this case, let's assume that the weight of the bookshelf is W and the location of the book is x meters from Q. The forces at points P and Q can be found using the following equations:
Moment at P = (W - F) x x
Moment at Q = F x (2 - x)
Where F is the force exerted by the book on the shelf.
Solving these equations for F and substituting the given values gives:
= F = W x (2 - x) / (2 - x + x)
= W x 2 / 3
The force at point P is equal to the weight of the bookshelf minus the force exerted by the book, which is:
= F at P = W - F
= W - W x 2 / 3
= W / 3
The force at point Q is equal to the force exerted by the book, which is:
= F at Q = F
= W x 2 / 3
So, if the weight of the bookshelf is W and the book is 50 cm from Q (which is equal to 0.5 meters), the force at point P is W / 3 and the force at point Q is 2W / 3.
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6) suppose the amount of mass in a black hole doubles. does the event horizon change? if so, how does it change?
When the amount of mass in a black hole twice, the event horizon doubles as mass.
The black hole's mass affects the event horizon's size. The radius of a black hole increases with its mass. For the Sun or any object with a solar mass of one, the event horizon is 3 km (a little under two miles). Black holes become less dense the more mass they receive. The singularity, a place that is nearly infinitely small and dense, is where a black hole's whole mass is concentrated. The event horizon, or the radius from the singularity at which its escape velocity exceeds the speed of light, encircles this point. The boundary where the velocity required to escape from a black hole exceeds the speed of light, the universe's maximum speed, is defined by the "surface" of the black hole, also known as its event horizon. Radiation and matter fall in, but they are unable to exit.
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if 90 j of work are needed to stretch a spring from 8 cm to 13 cm and another 294 j are needed to stretch it from 13 cm to 20 cm, what is the natural length of the spring?
The natural length of the spring is 10 cm. The further explanation about that can be seen below.
To find the natural length of the spring, we need to find the amount of work needed to stretch the spring from its natural length to 8 cm and from its natural length to 13 cm, and set these equal to 90 J and 294 J, respectively. Let's call the natural length of the spring x and the spring constant k.
The work needed to stretch the spring from its natural length to a length L is given by:
W = 1/2 * k * (L - x)^2
Substituting this equation into the two given equations and solving for x, we get:
90 J = 1/2 * k * (8 cm - x)^2
294 J = 1/2 * k * (13 cm - x)^2
Solving these equations simultaneously, we find that the natural length of the spring is x = 10 cm.
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an impulse of 20 n*s is exerted on a 0.30 kg baseball traveling 40 m/s west. what is the velocity of the baseball after it has been hit?
The velocity of the baseball after it has been hit is 106.67 m/s and moving towards east.
Given that, impulse = 20 N/s
Mass m = 0.3 kg
Initial velocity of the baseball Vi = 40 m/s
We know the formula for impulse as change in momentum. It can be written as,
Impulse = m ( Vf - Vi)
20 = 0.3* (Vf - 40)
66.67 = -Vf - 40
Vf + 66.67 + 40 = 0
Vf = - 106.67 m/s
The velocity of the baseball after it has been hit is 106.67 m/s but in the opposite direction to the initial velocity direction of the ball.
Thus, the ball moves with 106.67 m/s towards east.
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What is the kinetic energy of a ball with a mass of 0. 5 kg and a velocity of 10 m/s? (formula:)25 j5 j50 j100 j.
The object weighs 0.5 kg and moves at a pace of 10 meters per second. So: KE = (1/2)(0.5)(10)^2. As a result, the ball has a kinetic energy of 25 J.
In science, what is an energy?Energy is characterized as having the "ability to accomplish work, which is the capacity to apply a force sufficient to move an object." Despite this unclear definition, the concept is actually quite straightforward: energy is just the force that moves objects. Potential and kinetic energy are the two different categories.
What makes energy crucial?Modern medical technology, transportation, communications, computers, and many other things are all powered by energy. Energy security and affordability are more fundamental needs in developing countries.
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calculate the speed of a satellite moving in a stable circular orbit about the earth at a height of 3600
A satellite travelling at 3600 km per hour in a stable circular orbit around the earth has a speed of 6320 m/s.
Utilizing mass (of the earth and satellite) and the separation between the satellite and the earth's core, one can calculate the gravitational pull (or force) between a satellite and the earth.
The gravitational equation is v = √GM/r, where
v = orbital velocity (m/s)
G = 6.67x10-11Nm2kg2 (gravitational constant)
M is the orbiting body's mass (kg)
orbital radius, r (m)
5.97 x 10^24 kg is the Earth's mass, or M.
r = height + Earth's radius equals (6370 + 3600) x 10^3 = 9970 x 10^3 = 9.97 x 10^6 m
v = (6.67 x 10-11) x (5.97 x 10^24) / (9.97 x 10^6) = 6320 m/s
Hence speed of satellite is 6320m/s
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A bowling ball rolls without slipping up a ramp that slopes upward at an angle β to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes.
a. What is the acceleration of the center of mass of the ball?
b. What minimum coefficient of static friction is needed to prevent slipping?
Friction is an opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N) . The minimum coefficient of static friction is k= αtanβ.
It is a particular form of opposing force that is acting on the body's surface and seeks to stop the body from moving. its measure is in Newton (N). It is described mathematically as the result of the friction coefficient and normal reaction.
The equation becomes balanced once the specified force and acceleration have been resolved in each of the individual components.
X-directional components
On an incline, find the acceleration
Masina -F= ma
mgcosa =R
F=ur
Slippage must be prevented by a frictional force that is less than the maximum static friction force. We'll use constants like to represent the proportion between the opposite and adjacent sides of the ramp. At this point, ma equals the frictional force. Previously, a=gsin was found to exist. Equating both terms:
αmgsinβ = Kmgcosβ
K= α(sinβ/cosβ)
sinβ/cosβ= tanβ
k= αtanβ
Thus, the minimum coefficient of static friction is k= αtanβ.
A bowling ball rolls without slipping up a ramp that slopes upward at an angle β to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes.a. What is the acceleration of the center of mass of the ball?b. What minimum coefficient of static friction is needed to prevent slipping?
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What is the main reason that the gravitational attraction between Earth and the Moon changes each day?
(1) Earthâs axis is tilted at 23.5°.
(2) Earthâs rotational speed varies with the seasons.
(3) The Moon has an elliptical orbit.
(4) The Moon has a spherical shape.
The main reason that the gravitational attraction between Earth and the Moon changes each day.
Option b is correct.
what does the gravitational attraction between the Earth and the moon cause?Tides are the result of the gravitational tug from the Moon and Sun that the Earth feels. If we disregard the Sun for now, the Earth's oceans facing the Moon bulge up in response to the lunar gravitational force: a high tide.
Why is the gravitational attraction of the moon to Earth greater than the attraction of Earth to sun?Even though the sun is much more massive and therefore has stronger overall gravity than the moon, the moon is closer to the earth so that its gravitational gradient is stronger than that of the sun.
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FILL IN THE BLANK. according to the first law of thermodynamics, the total amount of energy in the universe _______.
According to the first law of thermodynamics, the total amount of energy in the universe constant .
The First Law of Thermodynamics is a thermodynamic adaptation of the Law of Conservation of Energy. "The total energy in a system remains constant, even when it may be transformed from one form to another," is a straightforward expression. "Energy cannot be created or destroyed" is another frequently used phrase (in a "closed system"). This is the fundamental tenet of the First Law, while there are numerous nuances and consequences that might be better expressed in more intricate forms.
It distinguishes between heat and thermodynamic work as two different types of energy transmission for a system with a constant amount of matter. The law also specifies a system's internal energy, a broad attribute for accounting for the balance of energies.
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identify the stage in star life cycle in which hydrogen is the primary fuel for nuclear fusion?
The stage of life cycle of star in which hydrogen acts as the primary fuel for nuclear fusion is main sequence.
Life cycle of stars: Main sequenceNebulae, which are enormous clouds of gas and dust, are where all stars are born. Stars do not survive forever, despite the fact that they shine for tens of thousands or even millions of years. A star's size affects both its last phase of life and the changes that take place in it over time.
A star's energy comes from nuclear reactions at its core, which is why it shines so brightly. This phase is referred to as the "main sequence." A star's exact lifespan is highly dependent on its size. Massive stars quickly run out of fuel. They might only exist for a few hundred thousand years, then. Smaller stars burn up their fuel more gradually, lasting for several billion years.
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if the sun is not brighter and the sun-to-earth distance has not decreased, where does this extra heat come from?
The sun's brightness is not increasing, nor has the separation between it and Earth. The greater heat must result from the atmosphere's greenhouse gases absorbing more infrared energy.
A greenhouse gas, often known as a greenhouse gas (GHG or GhG), is a gas that produces the greenhouse effect by both absorbing and emitting radiant radiation in the thermal infrared range. Water vapour, carbon dioxide, methane, nitrous oxide, and ozone are the main greenhouse gases in the Earth's atmosphere (O3). Instead of the current average of 15 °C (59 °F), without greenhouse gases, the temperature of the Earth's surface would be closer to 18 °C (0 °F). Also containing greenhouse gases are the atmospheres of Venus, Mars, and Titan.
The amount of carbon dioxide in the atmosphere has grown by more than 50% due to human activity since the start of the Industrial Revolution (about 1750), rising from 280 parts per million in 1750 to 421 parts per million in 2022.
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why increasing the number of slits in a diffraction grating improves the resolution capabilities of that grating.
A grating's resolving power will rise as the number of lines increases.
The peak intensity of the grating intensity expression is related to the square of the number of illuminated slits. The diffraction maximum becomes sharper and much more intense with additional slits, in addition to being much more intense overall. As a result, a grating with a high resolving power may discriminate between minute wavelength changes. Thus, we can improve the diffraction grating's resolution by increasing the number of slits. You get more damaging interference when you use more slits. On the other side, because of more constructive interference, the maxima grow more brighter. This significantly improves the experiment's resolution, making it simpler to quantify the interval between consecutive maxima.
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please help (urgent)
A small object of mass m is attached to a light string. The light string is attached to a fixed point on the ceiling. The object moves along a circular path in the horizontal plane forming a conical pendulum. The angle between the string and the vertical direction is fixed.
1. How are T, mg, and related?
A. Tcos =mg
B. T = mg cos
C. T sin =mg
D. T = mg sin
E. T = mg
2. What is the net force pointing to the center of the circle?
A. T
B. T sin
C. T tan
D. mg cos
E. T cos
3. How are [tex]ma_{cp}[/tex] and mg related?
A. [tex]ma_{cp}[/tex] = mg sin
B. [tex]ma_{cp}[/tex] =mg tan
C. [tex]ma_{cp}[/tex] = mg cos
D. [tex]ma_{cp}[/tex] = mg
E. [tex]ma_{cp}[/tex] tan =mg
4. If =15.0° and r = 0.200 m, find the angular speed and the linear speed of the object.
v = ____m/s
[tex]\omega[/tex] = ___rad/s
5. Is this a simple harmonic motion?
A. yes
B. no
Answer:
The correct answer is D. T = mg sin. The tension in the string (T) is equal to the mass (m) of the object multiplied by the acceleration due to gravity (g) and the sine of the angle between the string and the vertical direction.
The correct answer is E. T cos. The net force pointing to the center of the circle is the tension in the string (T) multiplied by the cosine of the angle between the string and the vertical direction.
The correct answer is A. = mg sin. The centripetal force is equal to the mass (m) of the object multiplied by the acceleration due to gravity (g) and the sine of the angle between the string and the vertical direction.
To find the angular speed of the object, you can use the formula = v/r, where v is the linear speed of the object and r is the radius of the circular path. Substituting the given values, you get = v/0.200 m. To find the linear speed, you can use the formula v = r , so v = (0.200 m)( ). Solving for and v, you get = 4.47 rad/s and v = 0.895 m/s.
The correct answer is B. no. A simple harmonic motion is a type of periodic motion where the restoring force is proportional to the displacement from the equilibrium position and is always directed towards the equilibrium position. In a conical pendulum, the restoring force is not proportional to the displacement and is not always directed towards the equilibrium position, so it is not a simple harmonic motion.
Explanation:
across a horizontal distance of feet, a roller coaster has a steep drop. the height of the roller coaster at the bottom of the drop is feet, compared to its height at the top of the drop. what is the average amount that the roller coaster's height changes over each horizontal foot?
For each horizontal foot, the roller coaster changes 6 feet in height.
A roller coaster has a steep drop over a horizontal distance of 25 feet.
the distance is 25 ft.
At the bottom of the drop, the roller coaster is 150 feet tall. (A negative sign is displayed since the measurement is made from top to bottom.)
The increase is therefore 150 feet.
The roller coaster's gradient is,
m= rise/run= 150/25= 6
A slope of 6 indicates that the object rises by 6 units for every unit of run.
As a result, the roller coaster changes height by six feet for every horizontal foot.
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Water flowing through an 8-cm-diameter pipe enters a porous section, as in fig. P3. 10, which allows a uniform radial velocity vw through the wall surfaces for a distance of 1. 2 m. If the entrance average velocity v1 is 12 m/s, find the exit velocity v2 if (a) vw
What is average speed?
Average velocity is outlined because the amendment in position or displacement (∆x) divided by the time intervals (∆t) within which the displacement occurs.
The average velocity will be positive or negative relying upon the sign of the displacement. The SI unit of average velocity is meters per second (m/s or ms-1).
For a suction velocity of Vw = 0.15 m/s
Cylindrical suction expanse.
Aw = 2π (0.04) (1.2) = 0.30 lbm2
Q1 = Qw+Q1
(12* π * (0.08)2 / 4 = (0.15)(0.30) + V2 π
(0.08)2 / 4
V2 = 3 m/s
Hence, the exit velocity is Vw = 0.15 m/s
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Which best describes the acceleration of the object? constant and positive constant and negative changing and positive changing and negative
the plates of an isolated parallel plate capacitor with a capacitance c carry a charge q. what is the capacitance of the capacitor if the charge is increased to 2q?
The plates' exact charges are Q, -Q. The charge that is acquired by the plate when a parallel plate capacitor of capacitor C is connected across a battery of potential difference V will be equal to Q = CV.
The entire charge is stored on both plates of a perfect capacitor. The potential difference V between the two plates is proportional to the charge Q on the plates. Q = CV, C = Q/V, and capacitance C are proportional constants. When one plate's area doubles while the area of the other plate is cut in half, the electrical capacitance is cut in half because the effective area is less. Where A is the area of the plate and d is the separation distance, capacitance C = oA/d.
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when a refrigerant trace gas becomes absolutely necessary to use, which of the available refrigerants should be used to identify a leak?
The refrigerant trace gas that should be used to identify a leak is the HCFC-22. Nitrogen gas should also be used along with trace gas.
HCFC-22, also known as chlorodifluoromethane, is a colorless gas that is used as a propellant and refrigerant. It was the most commonly used refrigerant for air-conditioning systems in buildings, but if it leaks, it may cause ozone depletion. Nowadays, it is still used but only when recovered and recycled.
One use of HCFC-22 is to detect a leak in a system. To do that, the system is pressurized with a trace quantity of HCFC-22 to a certain pressure, then dry nitrogen is used to further increase the system pressure. The trace refrigerant is enough to be detected by a leak detector.
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