b = {- 8, 0, 7, 15}
15 elements of set b are greater than 7.
In mathematics, what is a set?In mathematics and logic, a set is any collection of objects (elements) that may or may not be mathematical (e.g., numbers and functions). A set is typically represented as a list of all its members surrounded by braces. The intuitive concept of a set is likely even older than the concept of number.Capital letters are used to represent the set. Sets include the empty set, finite set, equivalent set, subset, universal set, superset, and infinite set. During calculations, each type of set has its own significance. Sets are primarily used in our daily lives to represent bulk data and data collection.Mathematics Set Theory Symbols
Symbol Symbol Name Meaning
A ∪ B union Elements that belong to set A or set B
A ∩ B intersection Elements that belong to both the sets, A
and B
A ⊆ B subset subset has few or all elements equal to
the set
A ⊄ B not subset left set is not a subset of right set
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An unmanned satellite orbits the earth with a perigee radius of 10,000 km and an apogee radius of 100,000 km. at how many locations in the orbit is the altitude 10,000 km?
At one location in the orbit, the altitude is 10,000 km.
What do apogee and perigee mean?Its perigee is the monthly location where it comes closest to Earth (this varies throughout the year).
The Moon’s apogee is the location where it is each month when it is the furthest away from Earth (this varies throughout the year as well).
What is the Earth’s apogee?The location on an object’s orbit around the earth that is furthest from the planet’s core, such as a satellite.
The distance at which an object orbiting a planet or satellite (like the moon) reaches that point.
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An electron was accelerated from rest through a potential difference of 2500 v. what is its speed?
The velocity of electron accelerated from rest through a potential difference of 2500 V will be 2.9654848 × 10⁷ m/s.
We have an electron accelerated from rest through a potential difference of 2500 V.
We have to determine its speed.
What is the Kinetic energy of the electron when accelerated through a potential difference of V volts ?The Kinetic energy of electron when accelerated through a potential difference of V volts is -
E = eV
According to the question -
Applied Potential Difference = V = 2500 volts
The Kinetic Energy of electron = K[E] = 1.6 x 10¹⁹ x 2500.
Therefore -
1/2 mv² = eV
[tex]$v =\sqrt{\frac{2|e|V}{m_{e} }}\\[/tex]
[tex]$v =\sqrt{\frac{2\times 1.6\times 10^{-19}\times 2500}{9.1\times 10^{-31} }}\\[/tex]
v = 29654848 = 2.9654848 × 10⁷ m/s
Hence, the velocity of electron accelerated from rest through a potential difference of 2500 V will be 2.9654848 × 10⁷ m/s.
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Suppose you measured the acceleration due to gravity and got a value of 10.1 m/s2. if the accepted value is 9.81 m/s2 , what is the percent error in your measurement (absolute value only)?
The percent error in your measurement is 2.95 % error.
here it is for the reason that the actual value is 9.81 [tex]m/s^{2}[/tex].
And the calculated value is 10.1 [tex]m/s^{2}[/tex].
Error = 10.1-9.81
= 0.29
Now percentage error = [tex]\frac{0.29}{9.81}*100[/tex]
= 2.95 %
So, the required error is 2.95 percent.
To degree the percent errors within the given records we should have the idea of percent and error calculation.
To measure the error we should calculate the difference in the real price and the calculated fee.
And to calculate the proportion we ought to divide the received error cost by using the actual price and multiply by means of a hundred.
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How much metabolic energy must a bird of mass 200 g expend to fly to a height of 20 m? neglect all losses due to friction, physiological imperfection, and the acquisition of kinetic energy.
The amount of metabolic energy expended by the bird is 39.2 J.
What do you mean by energy?Energy is the ability to perform work in physics. It might exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc. Additionally, there is heat and work, which is energy being transferred from one body to another. Energy is always assigned based on its type once it has been transmitted. Thus, heat transmitted may appear as thermal energy while labor performed may result in mechanical energy. Motion is a property of all energy types. For instance, if a body is moving, it possesses kinetic energy. Even while at rest, a tensioned object like a spring or bow has the ability to move; this is due of its design, which includes potential energy.
E = mgh = (0.20)*(9.8)*(20) = 39.2 J
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If a balloon is filled with 1.205 quarts of radon gas how many atoms will be in the balloon?
By Avogadro's number, the radon atoms is 3.02 x 10²² atoms.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many carbon atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
V = 1.205 qt = 1.205 x 0.95 lt= 1.14475 lt
ρ = 9.73 g/lt
Ar = 222
Calculate the mass of radon
m = ρ . V
m = 9.73 . 1.14475
m = 11.14 gram
Calculate the moles
n = m / Ar
n = 11.14 / 222
n = 0.05 mol
Calculate the number of atoms
N = n . Na
N = 0.05 . 6,02 × 10²³
N = 3.02 x 10²² atoms
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how far would it be from the milky way galaxy to the most distant galaxies in the observable universe on this scale?
The two marbles are separated by around 133 m or 30 vehicle lengths.
It is possible to determine the distance between our marble and the most distant galaxies in the universe by first comparing the size of the Milky Way Galaxy to that of a marble.The Milky Way Galaxy is just around 2,000 LY (Light Years) thick and roughly 100,000 LY (Light Years) wide.
Let's continue using the conversion of:
1 cm = 100,000 LY
The Andromeda and Triangulum galaxies are two of the noteworthy members of the Local Group, a collection of galaxies nearby to our own. On this scale, we can assume that distance from Earth and distance from the edge of the Andromeda Galaxy are approximately 2.5 MLY (2.5 Million Light Years) apart.The galaxy spans about 220,000 LY. So let's determine where to place this marble:
2,500,000/100,000 = 25 cm
We may lay a marble to symbolise the Andromeda Galaxy that is nearly twice the size of our Milky Way Galaxy marble at 25 cm.
We can see farther as our observational equipment advances. A galaxy 13.3 BLY distant is the furthest object Hubble can currently observe .
So let's try placing the marble here:
13,300,000,000/100,000 = 13,300cm = 133m
To put this into context, the two marbles are separated by around 30 vehicle lengths.
See the reference pic below:
The complete question is: In a scale model of the Local Group of Galaxies, in which the Milky Way Galaxy was the size of a marble (about 1 cm in diameter), how far would it be from the Milky Way Galaxy to the most distant galaxies in the observable universe on this scale?
CA-Common Core English Language Arts 9 A
Answer:
The standards establish guidelines for English language arts (ELA) as well as for literacy in history/social studies, science, and technical subjects.
Explanation:
Answer:
A
Explanation:
If 2 objects at different temperatures are in contact with each other what happens to their temperature
When two objects of different temperatures come into contact with each other, equilibrium is reached and energy is transferred from the hotter object to the cooler object until the objects reach thermal equilibrium (that is, they are at the same temperature).
When one object heats another, the increase in the temperature of one object is not always the same as the decrease in the temperature of the other, because the specific heat of one object is higher than the other.
Objects exchange thermal energy until they are at the same temperature. When two objects with different temperatures come into contact, they eventually achieve the same temperature. This is because of the thermal equilibrium.
Heat Transfer: Heat Transfer from Warmer Object to Cooler Object - When two substances at different temperatures are mixed, heat is transferred from a hotter object to a cooler object until the same temperature is reached (zero law of thermodynamics) - thermal equilibrium).
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a computer's power supply converts mains ac to low-voltage regulated dc power for the internal components of a computer. you are building a new computer. you are deciding which type of power supply to install. which of the following definitions best describes a valid type of power supply?
In order to prevent overloading of any circuit, dual rail electrical supply includes independent tracks and P C B traces that are used to offset voltage sags between various circuits.
Using conductive paths, tracks, or signal traces etched from copper sheets laminated onto a non-conductive substrate, a printed circuit board, or PCB, is used to mechanically support and electrically link electronic components.
Semiconductors are used by practically all inverters to generate a controlled power output. An input voltage is rectified if the source has an ac input.
It is, therefore, the proper response.
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State the sub particles of atoms and name and change
Answer:
proton = charge is + (positive charge)
neutron = charge is 0 ( no charge - neutral)
electron = charge is - (negative charge)
hope this is what you meant :)
(15 points) a 4000-w electric resistance heater is heating water in an insulated, constant diameter tube. if the water enters the heater steadily at 315 k and leaves at 360 k, determine the mass flow rate of water in kg/s.
The mass flow rate of water is 0.087 Kg/s.
Contact tube diameter means no pressure head drop.
P=C heating done at P=C.
MC(T₁ - T₂) = Q = W
M × 1.015 (360-315) = 4000
M = 4000 / 1.015 × [tex]10^{3}[/tex] × 45
M = 0.087 Kg/s
Pressure is defined due to the fact the pressure of all the gasoline particle/wall collisions divided thru the vicinity of the wall: All gases exert strain ; it's far one of the important measurable portions of this phase of depend.
From the weather to air tour, strain performs a dramatic position in our lives. It plays especially vital roles at some point of chemical reactions. through manipulating stress, chemists can pressure chemical reactions to occur and the transitions among solids, beverages, and gases to boost up.
The primary unit of pressure is the pascal, described because the stress exerted with the useful resource of a pressure of one newton perpendicularly upon a place of one square meter.
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How long will it take for 10% of the u−238 atoms in a sample of u−238 to decay?
it will take around 1,448 billion years for U-238 atoms to decay.
What are radioactive materials?When a radioactive nucleus spontaneously releases excess energy, that energy is referred to as ionizing radiation. radiation from ions may manifest as alpha or beta particles. either gamma rays or particles. The action of Radioactive means to emit radiation.
U-238 has a radioactive half-life of 4.5 billion years, which is independent of the original concentration.
c₀ - initial concentration of U-238.
c - concentration of U-238 remaining at the time.
t = 4,5·10⁹ y.
First, calculate the radioactive decay rate constant λ:
λ = 0,693 ÷ t = 0,693 ÷ 4,5·10⁹ y = 1,54·10⁻¹⁰ 1/y.
ln(c/c₀) = -λ·t₁.
ln(0,8/1) = -1,54·10⁻¹⁰ 1/y · t₁.
t₁ = 1,448·10⁹ y.
Therefore, it will take around 1,448 billion years for U-238 atoms to decay.
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How do we know when v final is negative or 0 in projectile motion?
Answer:
The Vertical initial velocity for a projectile can be zero for an infinite number of cases. The only requirement stands that the initial velocity (velocity at the time we start observing) should be zero, independent of acceleration along that axis or any other perpendicular axis.
The advantage of using the scientific method is that
A: it's cautious building of evidence-based understanding is dependable and logical.
B: it's random way of trying everything covers all options
C: any evidence in disagreement with a theory can be thrown out.
D: continual testing leads to mistakes being made.
The correct option is A.
The advantage of using the scientific method is that it is having a well-cautious building of evidence-based understanding that is dependable and logical.
The scientific method includes rigorous observation in addition to logic as a system of reasoning for organizing but for deducing beyond what is known from observation. Induction, prediction, and analogy are only a few examples of different reasoning techniques.
Evidence, as used in legal contexts, is generally defined as information, facts, or data that supports (or refutes) a claim, assumption, or hypothesis. In reality, anything could qualify as proof provided it is deemed to be true, trustworthy, and pertinent.
Although scientists frequently utilize evidence in other ways, such as when applying ideas to real-world issues, scientific evidence is evidence that helps to either support or refute a scientific theory or hypothesis.
Generally speaking, scientific evidence is founded on the knowledge that has been acquired via the application of the scientific method. This indicates that the evidence's underlying assumptions have undergone testing and general acceptance in the scientific community.
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The density of aluminum is 2700 kg/m3. if transverse waves propagate at in a aluminum wire, what is the tension on the wire?
The tension on the wire is 52.02N.
Using the formula:
[tex]v = \sqrt{\frac{T}{u} }[/tex]
where, v = speed of sound wave
T = tension in wire
μ = mass per unit length
The area of aluminium wire is : [tex]\frac{\pi d^{2} }{4}[/tex]
Area = 1.66×[tex]10^{-5}[/tex][tex]m^{2}[/tex]
and μ = ρA = 2700×1.66×[tex]10^{-5}[/tex]
μ = 0.045kg/m
Therefore, tension is :
[tex]v = \sqrt{\frac{T}{u} }[/tex]
[tex]34^{2} = \sqrt{\frac{T}{0.045} }[/tex]
Solving for T we get, T = 52.02N.
Therefore, the tension on the wire is 52.02N.
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what is the wavelength of an earthquake that shakes you with a frequency of 11.1 hz and gets to another city 93.0 km away in 14.0 s?
The correct answer is 598.4m
Two key elements in describing a wave's nature are its wavelength and frequency. Wavelength is essentially a measurement of the separation between two adjacent wave crests or troughs. It is always calculated in the direction of the wave, and the sign for it is. Given that it is a measurement of distance, it is stated in terms of metres.
Frequency: The number of times a particle vibrates during a sound wave's passage through a medium is referred to as frequency. The total amount of vibrations that occur within a certain period of time is the frequency.
Wavelength: The distance between two successive curve crests or troughs is known as a wavelength. The distance between the crests and troughs of a high-frequency wave is smaller than that of a low-frequency wave, and vice versa.
s=93km=93000m
f=11.1hz
t=24.43 sec
λ=v/f
λ=s/ft
λ=93000/(11.1)(14)
λ=93000/155.4
λ=598.4m
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How much work have you done when you lift a 90-N child 0.5 m
Answer: not alot
Explanation:
How do atoms behave in cold and hot temperatures
In cold:
An object's temperature is a measure of how much its atoms move — the colder an object is, the slower the atoms are.
In heat:Heating a substance makes its atoms and molecules move faster. This happens whether the substance is a solid, a liquid, or a gas.
the length of the eye and the curvature of the cornea determine the refractive error of an eye. hyperopia, or farsightedness, is produced by a shorter-than-normal eye.
True, the length of the eye and the curvature of the cornea determine the refractive error of an eye. Hyperopia, or farsightedness, is produced by a shorter-than-normal eye.
What is Hyperopia?With farsightedness (hyperopia), a common visual issue, you may be able to see far objects clearly but have hazy vision of nearby items.
Your ability to focus is influenced by how farsighted you are. People with severe farsightedness might only be able to see objects that are far away clearly, whereas people with mild farsightedness might be able to see objects that are nearby clearly.
SymptomsBeing farsighted can mean:
Nearby objects might seem hazy
Squinting is required to see clearly.
You experience eye pain or discomfort around the eyes as well as eyestrain.
After performing close work, such as reading, writing, using a computer, or sketching, for a while, you have general eye discomfort or a headache.
A distortion of focusYour cornea or lens must be uniformly and smoothly bent to allow light to pass.
You have a refractive error if your cornea or lens are not uniformly and smoothly curved, which causes improper light refraction.
When your cornea is overly flat or your eyeball is shorter than normal, you develop farsightedness. Nearsightedness has the opposite impact.
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If a rolling ball had 18 joules of KE and is rolling 3 m/s, what is the mass?
Answer:
4Kg
Explanation:
1/2mv²=K.E
1/2m×3²=18J
1/2m×9=18
9m=18×2
9m=36
m=36/9
m=4Kg
Answer:
F=MA FORSE= MASS X ACCELERATION
Explanation:
So the answer should be 54 as 18 X 3 = 54
( I read the question wrong)
What is the length of RG, if PR=2 and PG=16? P R G
The length of RG, given the data from the question is 14
Data obtained from the questionFrom the question given above, the following data were obtained:
Length of PR = 2Length of PG = 16Length of RG =?How to determine length of RGWe can obtain the length of RG as illustrated below:
Length of PG = Length of PR + Length of RG
Thus,
Length of RG = Length of PG - Length of PR
Length of RG = 16 - 2
Length of RG = 14
Therefore, we can conclude that the length of RG is 14
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receptacles have several screw terminals for the attachment of circuit conductors. match the following screws with their intended conductor.
A. Equipment grounding conductor B. Hot (phase) conductor C. Grounded (white) conductor
Matching is done as:Silver-colored screw is matched with C) Grounded (white) conductor
Brass-colored screw is matched with B) Hot (phase) conductor
Green hexagonal screw is matched with A) Equipment grounding conductor.
Electrical conductorA substance or material that permits the flow of electricity is known as an electrical conductor.
What are the three different types of conductors?When a voltage is applied, electrical charge carriers, typically electrons or ions, move easily from atom to atom.
Are conductors a component of a circuit?There are four different types of conductors: good conductors, semiconductors, resistors, and non-conductors.
Metals are effective electrical conductors. One or more loosely bonded valence electrons, or even just one, can be found in metals. These electrons can freely flow around an electric circuit, creating a domino-like effect.
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what is the number of waves here?
Answer: i counted 10 waves on your graph
Explanation: hope this helps!!!
Answer:
The Number of waves is 9 based on the trough and crest.
A cyclotron with a magnetic field of 0.36 t is designed to accelerate protons in a circle with a radius 0.56 m. what is the angular frequency of the proton? answer in units of rad/s.
The angular frequency of the proton which is cyclotron with a magnetic field of 0.36t is 4.31 x 10⁷ rad/s .
What is magnetic field ?The electromagnetic force, one of the four fundamental forces of nature, is the origin of the magnetic force, which is produced by the movement of charges. Any two charge-containing objects travelling in the same direction are attracted to one another magnetically.
The electromagnetic force, one of the four basic forces of nature, produces the magnetic force, which is caused by the movement of charges. A magnetic attraction draws two charge-containing objects together when they are moving in the same direction.
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determine the design angle ϕ ( 0 ° ≤ ϕ ≤ 90 ° ) ϕ(0°≤ϕ≤90°) between members ab and ac so that the 400-lb horizontal force has a component of 600 lb which acts up to the right, in the direction from b toward a. also calculate the magnitude of the force component along ac. take
The magnitude of the force along ac is 322.97 lb and the design angle of the system is ϕ = 38.26°
The Given problem can be solved on the Parallelogram law of vector addition and law of sines,
from the figure, we can write
F = √(400² + 600² - 2(400 × 600)cos 30)
F = 322.97 lb
In order to get the design angle, we will solve by:
(sinϕ)/(sin 30) = 400/322.97, where ϕ is the design angle.
therefore
sinϕ = (400/322.97) × sin 30
sinϕ = 1.2385 × 0.5
sinϕ = 0.61925
ϕ = sin^(-1) 0.61925
ϕ = 38.26°
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a car has wheels with a 12 inch radius. if each wheel's rate of turn is 5 revolutions per second, find the angular speed in units of radians/second.
The angular speed of the car's wheel in units of radians/second is determined as 31.42 radian per second.
Angular speed of the car's wheel
The angular speed of the car's wheel is calculated as follows;
ω = 5 rev/sec
Convert the angular speed in revolutions per second to radian per second.
ω = 5 rev/sec x 2π rad/rev
ω = 10π rad/sec
ω = 31.42 rad/sec
Thus, the angular speed of the car's wheel in units of radians/second is determined as 31.42 radian per second.
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The writer is considering adding the following sentence after sentence 9. Indeed, kane persuasively argues that diplomacy works best "if we bring it down to our individual communities and the people in the communities. " should the writer add this sentence after sentence 9 ?.
Yes, because it incorporates a second clarifying quotation from the expert, adding more weight to the argument presented in phrase 9.
Within a group of diplomats, negotiations and bargaining essentially consist of trying to get more than you are likely to get by negotiating, and eventually reaching a compromise. On occasion, foreign officials will join ongoing negotiations for assistance. Because it advances the interests under its purview and strengthens nations, states, and organizations, diplomacy is significant. The primary tool of foreign policy, which stands for the more general objectives and plans that direct a state's relations with the rest of the world, is diplomacy. Diplomatic negotiations and processes typically lead to international treaties, accords, alliances, and other manifestations of foreign policy. Diplomats may also provide government with advice to assist form a state's foreign policy.
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How does the working distance of a microscope chnage when you increase the magnification?
By switching to a higher power objective lens, the working distance is shrunk while the overall magnification increases.
What is working distance of a microscope?
Working distances for high-power oil immersion objectives can be as low as 0.1 mm and as high as 50 mm for dissecting or stereo microscope objectives. As magnification, resolution, and numerical aperture rise, it falls. Most microscope objectives are made with limited operating distances in mind.
By switching to a higher power objective lens, the working distance is shrunk while the overall magnification increases. On the other hand, lowering the total magnification while extending the working distance by adding a reduction objective.
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Find the resultant of the following forces: (a) 425 newtons at 55 degrees; (b) 5 newtons at 161 degrees; (c) 35 newtons at 320 degrees.
consider F1 = 425 N θ1 = 55
F2 = 5 N θ2 = 161
F3 = 35 N θ3 = 320
Now, take x and y component of force
Fx = F1cos55 + F2cos161 + F3 cos320
fx= 425 * 55 + 5 * (-0.94) + 35 * 0.76
fx =242.2- 4.7+ 26.6
fx =264.1
now fy
Fy = F1sine55 + F2sine161 + F3 sine320
fy= 425 * 0.81 + 5 * 0.32 + 35 * (-0.64)
fy = 344.2+1.6-22.4
fy = 323.4
now resultant force
Fr^2= fx^2+fy^2
= (264.1)^2 + (323.4)^2
Fr= 417
now, consider F1 = 425 N θ1 = 55
F2 = 5 N θ2 = 161
F3 = 35 N θ3 = 320
Now, take x and y component of force
Fx = F1cos55 + F2cos161 + F3 cos320
fx= 425 * 55 + 5 * (-0.94) + 35 * 0.76
fx =242.2- 4.7+ 26.6
fx =264.1
now fy
Fy = F1sine55 + F2sine161 + F3 sine320
fy= 425 * 0.81 + 5 * 0.32 + 35 * (-0.64)
fy = 344.2+1.6-22.4
fy = 323.4
now resultant force
Fr^2= fx^2+fy^2
= (264.1)^2 + (323.4)^2
Fr= 417
now, resultant angle
tan θ =fy/fx
= 323.4/264.1
tan θ = 1.2
θ =0.020
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ow many times as strong is the coulomb repulsion between two electrons than the gravitational attraction between the same two electrons? (the distance does not matter.)
According to this estimate, at any distance, the gravitational force between two electrons is always 4.1 x 10^42 times stronger than the electric force between them.
What is gravitational attraction?Gravitational attraction definitions. The force of attraction between all masses in the universe, particularly the pull of the earth’s mass on objects that are close to its surface.
Gravitation, gravitational force, and similar terms.
Case Studies of GravityThe force interacting with the Earth and Sun. the driving force behind the Moon’s revolving orbit around the Earth. The force of the Moon is what drives the tides in the ocean. The force trapping every gas inside the Sun.
What triggers the gravitational pull?The mass of the Earth is what creates gravity. The combined gravitational force of all of its mass acts on the mass in your body. What gives you weight is that. Moreover, if you lived on a planet with a mass lower than
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