A pristine nickel surface with a work function of 5.1 eV is exposed to 206 nm light. The photoelectrons released from this surface have a maximum speed of 521.8 x 10^3 m/s.
An electron of the metal can receive photon energy from incident light, which is equal to the planck's constant times the light's frequency.
f = c/∧
assuming that all of the photon energy has been utilized
First in removing electrons from metals (work function)
Second, the leftover is used to furnish the photoelectron with kinetic energy:
V(m) = √2/M(hc/∧)-5.1eV.
where: M = 9.11 x10^3 kg; is the mass of nickel
h = 6.63 x 10 -34 Js; is plancks constant
c = 3 x 10^8 m/s; is the speed of light
∧ = wavelength of light = 206 nm = 206x10-9m
v(m) = (2 x 6.63 x 10-34 x 3 x10^8)/206 x 10-9 x 9.11x10^3 - 5.1 eV
v(m) = 521.8 x 10^3 m/s.
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Nathalie, Selene, and Ella are playing tug-of-war, fighting over a .30 kg water bottle. Nathalie is pulling to the left with 85 N of force and Selene and Ella are both pulling to the right – Selene is pulling with 75 N of force. If the water bottle accelerates to the left at 2.0m/s2
A.Fnet on water bottle
B. FElla
The net force on the bottle is 6 N and the force exerted by Ella is 4 N.
We know the formula given by sir Issac Newton, which is, F = ma.
This formula means Force is equal to the mass of the particle times the acceleration of the particle.
So in this case the acceleration of the particle is given as 2 m/s.
The mass of the given particle is 3 kg.
Hence, the force on the particle is 3 X 2 = 6 Newtons.
In our case, the particle is a water bottle, hence the F net on the water bottle is 6 N.
Now, as the net force experienced by the bottle is 6 Newtons,
F Nathalie - F Selene -F Ella = 6N
85-75- F Ella =6 N
=> F Ella =4 N
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acceleration of 14 m/s/s mass of object is decreased by a factor of 2.2 then the new accelration woul dbe
When the mass of the object is decreased by a factor of 2.2, the acceleration is increased by a factor of 2.2, new acceleration would be of 30.8 m/s/s.
The effect of reducing the mass of an object by a factor of 2.2 on its acceleration is determined by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
In terms of calculations, the new acceleration can be calculated by multiplying the initial acceleration by the factor by which the mass is decreased. Therefore, the new acceleration of the object with a reduced mass of 2.2 times its original mass would be 2.2 times its initial acceleration of 14 m/s/s. This would result in a new acceleration of 30.8 m/s/s (14 x 2.2 = 30.8).
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identify the correlation you would expect to see between the weight of baggage someone carries and the speed at which he or she walks. explain.
Negative association; the pace of walking slows down as the amount of luggage grows.
Positive and negative correlation: what are they?Inverse correlation is another term for negative correlation. In statistics, an inverse correlation explains the association between two variables that vary in the opposite directions from one another, whereas a positive correlation shows the link between two variables that change together.
When two variables behave in synchrony, rising or falling in lockstep with one another, there is a positive correlation. When two variables move in opposition to one another—that is, when one rises, the other falls—this is known as a negative correlation.
A link between two variables that move in the opposing directions is known as a negative correlation.
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use the theory of elasticity and given applied pressure at the end of construction, determine the settlements at 2p and 3p
Elasticity theory is concerned with the relationship between forces applied to an item and the subsequent deformations.
In practice, analyzing a material's elastic behavior is reduced to studying basic deformations and determining the appropriate elastic constants. Our bodily tissues are pliable. This mechanical feature is particularly significant in the lungs, skin, and arteries, because aging produces emphysema, loose skin, and arteriosclerosis. Elastic fibers are extracellular matrix fibers that resemble rubber and are responsible for tissue elasticity. Elasticity refers to an object's or material's capacity to return to its original shape after being stretched or crushed. Because of its elastic nature, a rubber regains its shape after a long stretch.
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A boy is initially seated on the top of a hemispherical ice mound of radius R=13.8m. He begins to slide down the ice, with a negligible initial speed (Fig. 8-47). Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?
The height of the boy above the bottom of the mound is 9.20m.
What is radius ?
The radius of a circle is the distance a circle's center from any point along its perimeter. Usually, "R" or "r" is used to indicate it.
What is speed ?
Speed is the rate of change in location of an item, expressed in metres per second. For instance, the speed of an item is one metre per second if it starts at the origin and goes three metres in three seconds. Speed is easily calculated by dividing a distance by a time.
Let FN be the normal force of the ice on him and m is his mass. The net inward force is mgcosθ−F N , and, according to Newton's second law, this must be equal to mv 2 /R, where v is the speed of the boy. At the point where the boy leaves the ice F N =0, so gcosθ=v 2 /R.. We wish to find his speed. If the gravitational potential energy is taken to be zero when he is at the top of the ice mound, then his potential energy at the time shown is
U=−mgR(1−cosθ).
He starts from rest and his kinetic energy at the time shown is 21 mv 2 . . Thus conservation of energy g 0= 21 mv 2 −mgR(1−cosθ)orv=2gR(1−cosθ).
We substitute this expression into the equation developed from the second law to obtain gcosθ=2g(1−cosθ). This gives cosθ=2/3.
The height of the boy above the bottom of the mound is
h=Rcosθ= 32R= 32(13.8m)=9.20m
Therefore, the height of the boy above the bottom of the mound is 9.20m.
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a small em-wave source (i.e. a small collection of charges which is vibrating in simple harmonic motion having a known frequency) radiates an electromagnetic wave into the vacuum of space itself. of course, the electromagnetic wave consists of blocks of magnetic and electric fields which are leaving the vibrating source; these blocks of electric and magnetic fields leave the source in all possible directions (i.e. nothing has been done by the designers of the source to form the wave into a tight beam). as the wave moves away from the source, determine what happens to each of the following: a) the frequency of the electromagnetic wave o increases o decreases O remains constant (b) the intensity of the electromagnetic wave increases o decreases O remains constant Give your reasoning as briefly as possible
As the wave moves away from the source, the frequency of the wave (c) remains constant whereas the intensity of the wave (b) decreases.
Frequency stays same because frequency of EM wave does not depend on the distance from the source because waves cannot just disappear in free space.
So, frequency remains constant.
The intensity (I) of a wave is defined as the rate at which it transfers energy divided by the area over which the energy is spread. In other words, intensity is the rate of energy flow per unit area.
Intensity of EM wave is inversely proportional to the square of distance from source, as
I = P/A
So, intensity of wave decreases.
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La varilla liviana de la figura 5.12
n 1986, a nuclear power accident in chernobyl, ukraine led to high radiation levels for kilometers surrounding the plant. the high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been studying vole populations in the chernobyl area ever since. based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the vole populations following the accident?
Based on my understanding of evolutionary mechanisms, Mutation led to increased genetic variation in 1986, nuclear power accident Chernobyl, Ukraine.
Mutations:
Mutations, or changes in the nucleotide sequence, can be caused by transposition, covalent changes in structure brought on by reactions with environmental chemicals or physical agents, or errors during DNA replication. Cells are where the majority of sequence changes are corrected.
Without these mutations, populations of species would not change in a way that would allow them to adapt to environmental changes. A mutation is an abrupt change to DNA. Radiation or any type of mutagen can cause mutations. Mutations were brought about by the radiation in this catastrophe. As a result, the organism will vary.
Genetic Variation:
The variety in DNA sequence seen in each of our genomes is referred to as genetic variation. We are all different from one another in terms of our hair color, complexion tone, and even the form of our features due to genetic variance.
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A quantum system has three energy levels, so three wavelengths appear in its emission spectrum. The shortest observed wavelength is 263nm ; light with a 434nm wavelength is also observed.
Part A
What is the third wavelength?
The distance between two successive troughs or crests is known as the wavelength. The third wavelength will range from 700 to 900 nm.
The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometres, and other units since it is a distance measurement.
The wavelength emitted is proportional to the difference in the energy level change. The shift in energy level is large for the wavelength 263nm. 434nm light indicates a further shift in energy level,
However, the difference in energy level for this wavelength to be emitted is not bigger than the prior one. There is a chance that these subsystems currently have very little energy
Hence the third wavelength will range from 700 to 900 nm.
The distance between each node is one-third the length of the string. The picture up above displays the standing wave pattern. You should be able to tell from the image that the wavelength of the third harmonic is divided by the string's length in half.
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Consider two identical rods with lengthLand uniformly distributed massM. The rods are not pinned down, they are free to move both translationally and rotationally. Initially, the center of mass of each rod is stationary, but the left rod is rotating clockwise around its center with an angular speedω0(the right rod is not rotating): The ends of the rods collide. After the collision, the left rod moves directly up towards the top of the page with a speedv, and is no longer rotating around its center: If the collision is elastic, find expressions for the following quantities: - the speedv
- the final translational velocity of the center of mass of the right rod - the final angular velocity of the right rod around its center Express your answers in terms ofω0,L, and numerical factors.
The centre of mass of the right rod has a final translational velocity of MWo2/12. The right rod's final angle of rotation about its centre is ML2/12.
Ordinary velocity, expressed in metres per second, is what translational velocity is. Tangential velocity is the part of ordinary (translational) velocity that is in the tangential direction. For instance, if a rigid body is rotating about a fixed axis at an angular velocity of radians per second, any point r metres away from the axis will have a purely tangential velocity of r metres per second. The speed at which the angular location or orientation of an item varies is represented by a pseudovector in physics as angular velocity or rotational velocity ( or ), also called an angular frequency vector.
Iz = Ix+Iy
Ix = iy
Iz = 2Ix
(ML^2/6)/2 = ML^2/12
the final angular velocity of the right rod around its center is ML^2/12.
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two small speakers a and b are driven in step at 725 hz by the same audio oscillator. these speakers both start out 4.50 m from the listener, but speaker a is slowly moved away. (see (figure 1)).
Speakers both start out 4.50 m from the listener, but speaker a is slowly moved away.The first, constructive interference occurs when the path difference is lambda 0.47m.
A. Let us find the wavelength 1st
use:
v = f * lambda
344 = 725* lambda
lambda = 0.47 m
First destructive interference occurs when the path difference is lambda/2
path difference = d
d = lambda/2
d = 0.47/2
= 0.235 m
B. 2nd destructive interference occurs when the path difference is 3*lambda/2
path difference = d
d =3* lambda/2
d = 3* 0.47/2
= 0.705 m
C. first, constructive interference occurs when the path difference is lambda
path difference = d
d = lambda
d = 0.47 m
Wavelength is the distance between identical points in adjacent cycles of a waveform signal propagating in space or along a wire. In wireless systems, this length is usually expressed in meters, centimeters, or millimeters. Wavelength is the distance between two wave crests and the same for wave troughs.
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a piston a has a diameter of 0.81 cm, as shown. a second piston b has a diameter of 4.0 cm. a b 578.8 n f in the absence of friction, determine the magnitude of the force f~ necessary to support the 578.8 n weight. answer in units of n.
11.7 N of force is needed to hold the weight m on Piston 2.
What are example and force?Force is the term used to describe a body's tendency to change or modify its state as a result of an external cause. When force is applied, the item can also alter its size, shape, and direction. kick a ball, pushing and pulling on the door, or kneading dough are a few examples.
Briefing:
The force required to support weight, m on Piston 2 is calculated from Pascal's principle as follows:
P₁ = P₂
where P₁ is pressure on Piston 1 = F₁/A₁
P₂ is pressure on Piston = F₂/A₂
F₁/A₁ = F₂/A₂
F₂ is the force on Piston 2 = 1189 N
A₁ is Area 1 = πr²
where r = d/2
A₁ = π * (0.81/2 *1/100)²
A₁ = 40.5* 10⁻⁵ m²
F₁ is the force on piston 1 = ?
A₂ is area 2
A₂ = π * (4.0/2 *1/100)²
A₂ = 2 * [tex]10^{-2}[/tex] m²
F₁ = A₁ * F₂/A₂
F₁ =40.5* 10⁻⁵ m² * 578.8 N / 2 * [tex]10^{-2}[/tex]m²
F₁ = 11.7N
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a block of mass m on an inclined surface is attached to a spring of negligible mass, as shown. the other end of the spring is attached to a wall, and there is negligible friction between the block and the incline. the block is pulled to a position such that the spring is stretched from its equilibrium position. the block is then released from rest. which of the following systems can be classified as a closed system?
A block of mass m on an inclined surface is attached to a spring of negligible mass, as shown is a system consisting of the block, spring, and Earth.
What is mass?
The amount of matter in a particle or object is represented by its mass, which is denoted by the symbol m. In the International System (SI), the kilogram serves as the default unit of mass (kg).
What is inclined surface ?
An inclined plane is the technical term for a sloped surface. It is well known that objects can accelerate down inclination planes due to an imbalanced force. Analyzing the forces acting onto an object on an inclined plane is crucial for comprehending this form of motion.
Therefore, a block of mass m on an inclined surface is attached to a spring of negligible mass, as shown is a system consisting of the block, spring, and Earth.
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a mass m starts at rest and then falls down distance l, where it contacts an unstressed spring of negligible mass. if the spring compresses for a maximum of l/2, find the force constant of the spring in terms of mg/l.
For a mass, the spring's force constant is 12 mg/L. M begins at rest and descends l distance before colliding with a negligible mass unstressed spring. if the spring is compressed for no longer than l/2.
The spring constant is significant because it demonstrates a fundamental material characteristic. The amount of force necessary to deform any spring made of any material is specified here. The material is more stiff when the spring constant is higher, and less stiff when the spring constant is lower. The force constant of an undamaged spring is k. It is stretched to an equilibrium length that is well inside the elastic limit by a weight that is suspended from it.
mg(L+L/2) = 0.5 kx^2
mg(3L)/2 = 1/2k(1/2)^2
3mgL/2 = kl^2/8
k = 12mg/L
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Randomized block design: Researchers interested in identifying the optimal planting density for a type of perennial grass performed the following randomized experiment: Ten different plots of land were each divided into eight subplots, and planting densities of 2, 4, 6 and 8 plants per square meter were randomly assigned to the subplots, so that there are two subplots at each density in each plot. At the end of the growing season the amount of plant matter yield was recorded in metric tons per hectare. These data appear in the file pdensity. dat. The researchers want to fit a model like y = β1 + β2x + β3x 2 + , where y is yield and x is planting density, but worry that since soil conditions vary across plots they should allow for some across-plot heterogeneity in this relationship. To accommodate this possibility we will analyze these data using the hierarchical linear model described in Section 11.1. Randomized block design: Researchers interested in identifying the optimal planting density for a type of perennial grass performed the following randomized experiment: Ten different plots of land were each divided into eight subplots, and planting densities of 2, 4, 6 and 8 plants per square meter were randomly assigned to the subplots, so that there are two subplots at each density in each plot. At the end of the growing season the
The diversity of the vegetation on Earth contributes to its attractiveness, particularly the grassland, which is primarily covered in trees and grasses.
There are many different types of grassland, and one of them is savanna grassland, which is home to forbs and perennial grasses.
Large geographic areas called biomes are identified by a certain climatic pattern and a set of dominating plant and animal populations. Savanna and grassland biomes both have a dominant grass composition. In semi-arid climate zones where there is insufficient rainfall to sustain significant tree development, grassland biomes can be found. Savannas are grassland habitats that contain a sizable amount of woody vegetation, such as trees or bushes. Due to their need for a warm climate, they are found closer to the equator.
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If offspring is made asexually, how do they compare to the parent?
Answer: They will be an exact copy of the parent
Explanation:
what is the maximum magnitude of p that can be applied before tipping would occur, assuming the block does not slip? express your answer to three significant figures with appropriate units. ptip
A probabilistic assessment of seismic hazards requires an estimate of the maximum moment intensity M of the largest earthquake that is likely to occur in a given region. The answer is in the image.
Maximum magnitude, an important parameter in calculating seismic hazards, is also a controversial parameter. The choice of value can have a large impact on the final outcome of the results, but it is most likely the magnitude of an earthquake that has not yet occurred in the area under study.
The term size is defined as the number of flocks. For example, the magnitude can be used to describe the speed comparison between a car and a bicycle. It can also be used to describe how far an object has moved or how much an object has in relation to size.
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based on these insights, you create your primary message. which of the following reflect the expectations of a primary message? A
Although electric vehicle sales demand is on the rise, low availability of charging stations and short battery range are significant hurdles that Gaea must overcome
B
Electric vehicle sales demand is expected to grow by more than 400% by 2025. However, the number of publicly available vehicle charging stations is a significant factor in consumer buying decisions. Currently, there are many locations with so few charging stations that electric car owners would run out of power when traveling between stations. Vehicle battery range is also a significant factor for consumers. In 2020, the average battery range was 210 miles. However, the vast majority of people say they will not buy an electric car until the battery range is at least 300 miles per charge
C
Electric vehicle demand is skyrocketing
D
The number of publicly available vehicle charging stations is a significant factor in consumer buying decisions. Therefore, Gaea must begin building vehicle charging stations
The insights to be used in creating a primary message is that; Electric vehicle demand is skyrocketing. Option C
What are electric vehicles?We can see that the demand for electric vehicles has increased in the recent times. Why has the demand for electric vehicles increased? We know that in the recent times there has been a push for the use of cleaner energy.
This has made a strong impressions upon governments around the would and has led to an increase in the rate at which any kind of research that tries to fund the use of devices that use alternative energy to fossil fuels is concerned.
As a result of this, there has been an increase in the demand and the use of the electric vehicles especially in the developed countries where more people can be able to afford the vehicles.
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To avoid last-minute moves, you should be looking down the road to where your vehicle will be in about:
(a) 5 to 10 seconds.
(b) 10 to 15 seconds.
(c) 15 to 20 seconds.
Scrutinize the route 10-15 seconds in advance of your car to spot risks and prevent last-minute maneuvers. It's risky to stare at the car or the road just in front of yours all the time.
What controls the velocity of a vehicle?The ignition switch, brake pedal, or steering wheel are the three inputs on a car that can alter its speed. If either rate or location changes, velocity also does. The idea of acceleration describes how quickly the velocity varies.
What is an illustration of velocity?Velocity can be defined as the rate at which someone moves in a specific direction. as the pace of a car driving north on such a highway or the pace at which a rocket takes off. The location of the automobile is not shown by the speedometer. As a result, this instrument can only determine a vehicle's speed, not its velocity.
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A 10-cm-long spring is attached to the ceiling. When a 2.0 kg mass is hung from it, the spring stretches to a length of 15 cm.
What is the spring constant k? Answer for this already found= 392 N/m
1) How long is the spring when a 6.0 kg mass is suspended from it?
The spring is 20cm long when a 6.0 kg mass is suspended from it.
What is Hooke's Law's spring constant, k?K stands for the proportionality constant, commonly referred to as the "spring constant." In layman's words, stiffness and strength are shown by the k variable in Hooke's law (F = -kx). An object requires more force to be stretched to a specific length the greater the value of k.
F=-kx
“-ve" is for the direction of motion
K=F/x
Dimensions of F=[MLT-²]
Dimensions of x=[L]
K=[MLT-²]/[L]=[MT-²]
DIMENSIONS OF SPRING CONSTANT IS
[MT-²]
Why do we use the spring constant?The spring constant is calculated by dividing the force required to stretch or compress a spring by the lengthening or shortening of the spring. It is used to identify whether a spring is stable or unstable, and consequently, what system it should be employed in.
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A baseball player friend of yours wants to determine his pitching speed. You have him stand on a ledge and throw the ball horizontally from an elevation above the ground. The ball lands away. What is his pitching speed?
The pitching speed of basketball player is 58 m/s for A baseball player The ball lands away
As the ball thrown in horizontally, the initial vertical velocity of the ball is zero.
(Vy)t = 0
Use the kinematic equation of motion, y = (Vy)t+1/2gt² and find the time of flight of the baseball.
3.0 m = (0)t + 1/2 (9.8 m/s²)t²
3.0 m = (4.9 m/s²)t²
t= √3.0 m /4.9 m/s²
= 0.78 s
The maximum horizontal distance (range) travelled by the ball is.
x = v2t
V2 = x/t
= 30 m/0.78 s
= 38 m/s
Consider the ball is being thrown 5° above the horizontal. The maximum height to which the ball can go above the elevation is,
h= (vsin 5°)² / 2g
= [vsin 5°]² / 2(9.8 m/s²)
= 3.87×10^-4 V²
The time taken for ball to reach the ground from the height 0.559 m above the elevation of height 3.0 m is,
t=√2hmax/g
= √2(3.87x10^-4 v²) / 9.8 m/s²
= 8.88x10^-3 v
The horizontal range of the ball is.
x = v₂t
30 m = (v cos 5°) (8.88x10^-3 v)
V² = 30 m / (8.88×10^-3) cos 5°
v=58 m/s²
Consider the ball is being thrown 5° below the horizontal. The time of flight of the ball is,
t = v cos 5° / 30 m
=3.32×10^-2 v
The time taken for ball to reach the ground can be calculated as follows.
y = (Vy)t1 + 1/2 gt²
3.0 m = (vsin 5°) (3.32 × 10^−2 v) + 1/2 (9.8 m/s²) (3.32×10^-2 v)² =
3.0 m = (0.289×10^-2)v²+5.4×10^-3v²
8.29×10^-3 V^2 = 3.0 m
V = √3.0 m / 8.29 8 10^-3
= 19 m/s
Therefore, the minimum speed of the ball is 19 m/s and maximum speed of the ball is 58 m/s
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Your system volume is running out of disk space. You need to extend the system volume to give it more space. Which of the following conditions must be met to extend the system volume?O The system volume must be formatted with NTFS.O The disk must have contiguous free space on the same disk.
Contiguous free space on the same disk is the sole available option for expanding the system volume. For both basic or dynamic disks, this is true.
Choose two benefits of solid state storage over hard drives from the list below.Your computer will boot up faster thanks to SSDs, which also provide faster data transfer. When running applications that access vast volumes of data, such an operating system, faster speeds imply SSDs can policies and procedures for managing at the ultra-speeds required in today's commercial environment.
Which of the following has to be true in order to increase the system volume?On the same disk, there must be continuous open space. Only contiguous free space within the same disk can be used to expand the system capacity.
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A student initially stands on a circular platform that is free to rotate without friction about its center. The student jumps off tangentially, setting the platform spinning. Quantities that are conserved for the student-platform system as the student jumps include which of the following? 1. Angular momentum II. Linear momentum III. Kinetic energy Al only B Il only С I and II only D II and III only E I, II, and 111
The quantity conserved for the student platform system when the student jumps is included in the momentum angular.
The true choice is A.
Angular momentum is simply defined as the momentum possessed by objects that move circularly.
Momentum angle also has meaning as a measure used to see how much linear momentum is directed around a certain point. This point is known as the center point.
Since angular momentum and linear momentum are vectors, the direction must be considered. As in this question, the direction of the linear momentum keeps changing as the circular platform rotates, and the direction of the angular momentum is always the same (both off the page and into the page). That's why linear momentum changes but angular momentum doesn't. So, the quantity conserved for the student platform system when the student jumps is included in the momentum angular.
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orientation of patterns: explain why the diffraction pattern of the hair appears in the direction that it does (i.e., horizontal vs. vertical)
Additionally, if the light is sent as a vertical array of lines, these lines can be bent into horizontal rows of dots.
Simply put, what is diffraction?The act of light spreading out after passing through a tiny area or bending around an object is known as diffraction. The diffraction of light waves is a topic covered in physics classes. Sound, radio, and water waves are all susceptible to diffraction.
What is diffraction and how does it work?Water waves bending around a stationary object are the most typical instance of diffraction. Around an object's edge, light bends similarly. They diffract, or shift direction, noticeably.
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You're carrying a 3.0-m-long, 20kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip.
A) How much force must you exert to keep the pole motionless in a horizontal position?
Express your answer using two significant figures. answer must be "N"
You need to provide 132 N of force to maintain the pole horizontally.
The criteria are as follows: 3.2 m for the pole's length and 24 kg for its weight.
The pole's weight is determined as follows:
W = 24 x 9.8 = 235.2 N
The total force applied to maintain the pole's horizontality,
∑F = F1 + F2 = 235.2
F1 = 235.2 - F2
Consider the pole's core for a minute.
F1 × 1.6 = F2(1.6 - 0.35)
1.6(235.2 - F2) = 1.25 F2
376.2 - 1.6F2 = 1.25 F2
376.2 = 2.85 F2
F2 = 376.32 ÷ 2.85
F2 = 132.04
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On the basis of your knowledge of bonding in liquids and solids, which of the following substances has the highest melting temperature? Group of answer choices O CH4 O H2O O Cl2 O SO2 O NaBr
NaBr has the highest melting temperature on the basis of bonding in liquids and solids .
Option E is correct .
Network covalent solids, including silicon dioxide, graphite, and diamond, have the greatest melting points. A massive covalent structure is held together by a large number of strong bonds. There are certain metals with the next-highest melting points, particularly transitional metals.
Bonds between atoms in covalent compounds share electrons. They have distinctive physical characteristics, such as lower melting temperatures and electrical conductivity compared to ionic compounds, since they share electrons. Ionic compounds have high melting and boiling temperatures because it takes a lot of energy to break the bonds between the many ions in the ionic lattice.
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Question Maple Chobe Worth 2 points)
(08.08 MG)
An auditorium has special panels installed along its walls and portions of the celling to direct sound waves. Whi
property these panels are taking advantage of?
Reflection because reflected waves have a higher intensity
Reflection because reflected waves bounce off a media
Absorption because absorbed waves go into the media
Absorption, because absorbed waves have a lower frequency
Question &
Answer:
(b) Reflection because reflected waves bounce off a media
Explanation:
You want to know the property of special wall and ceiling panels that is being used to direct sound waves.
ReflectionThe properties offered in the answer choices are (1) reflection, and (2) absorption. Of these, the property most likely used is reflection.
Reflection causes the sound to bounce off the panel and move in a direction based on the angle at which it hits the panel. By angling the panels appropriately, the sound can be directed wherever it might be desired.
AbsorptionAbsorption will cause the sound to be "swallowed up" by the panel, so that the energy of it is lost in the panel and not returned to the air. An absorptive panel may also have a certain amount of reflection. In general, such a panel can modify the acoustic behavior of the auditorium, but will not "direct sound waves."
__
Additional comment
Often reflective panels are angled at more or less random angles so that sound is reflected around the room, but not to any particular spot. The purpose is to eliminate any echo in the room.
Answer:
The correct answer to "Which property these panels are taking advantage of?" is B. Reflection because reflected waves bounce off a media.
Explanation:
Part of a wave energy is absorbed by a solid through refraction and some is reflected off of the solids surface. An echo is a representation of reflected sound waves.
Echoes are minimized in theaters and performance venues. Additional panels are placed on walls and ceilings to help absorb and/or direct reflected sound waves in ways that enhance the audience's satisfaction of a live show.
"An auditorium has special panels installed along its walls and portions of the celling to direct sound waves."
Public Radio station KXPR-FM in Sacramento broadcasts at 88.9 MHz. The radio waves pass between two tall skyscrapers that are 15.0m apart along their closest walls.
A). At what horizontal angles, relative to the original direction of the waves, will a distant antenna not receive any signal from this station?
B).If the maximum intensity is 3.40W/m2 at the antenna, what is the intensity at �6.00? from the center of the central maximum at the distant antenna?
The horizontal angle will be 1.4598 rad and the intensity will be 1.576 W/m² in relation to the waves' initial direction.
A radar antenna is a gadget that broadcasts radio waves and watches for reflected waves. An antenna's performance is based on its capacity to recognize the precise direction in which an object is positioned.
The specified direction's horizontal angle is:
sinθ ∝ 1
sinθ = nλ/a
n ∝ λ/a
n = (88.9 * 10⁶ * 15)/ 3 * 10⁸ = 4.4454
n max = 4
The maximum angle θ4 = (4 * 3 * 10⁸)/ 15 * 88.9 * 10⁶ = 64.14°
The value of the wavelength is:
λ = c / v = (3 * 10⁸)/ (88.9 * 10⁶) = 3.3745 m
I = Imax [(sin δ/2)/ δ/2]
β/2 = π /4 (a sinθ)
β = π / 3.3745 (15 sin 6°) = 1.4597 rad
I = 3.4 * (sin 1.4597/ 1.4597)² = 1.576 W/m²
As a result, at horizontal angles, the intensity will be 1.576 W/m2 and the wave direction will be 1.4597 rad.
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the colors in a rainbow are caused by the colors in a rainbow are caused by different amounts of absorption for light of different colors by the water in the raindrops. the interaction of the light reflected from different raindrops. the downward motion of the raindrops. different amounts of refraction for light of different colors by the water in the raindrops.
Varying degrees of refraction for various colours of light by the water in raindrops.
What is absorption ?
A chemical or physical phenomena known as absorption occurs when molecules, atoms, and ions from the substance being absorbed move into the bulk phase (gas, liquid, or solid) of the medium in which they are being absorbed.
What is reflected ?
When a wave encounters a barrier between two media, it will abruptly change direction and reflect. The approaching wave disturbance, at least in part, stays in the same medium.
Different amounts of refraction for light of different colors by the water in the raindrops. because, the amount of light will under go refraction, internal reflection and dispersion.
Therefore, option (d) is correct.
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Most of the mass of our Galaxy lies
a) in the bright spiral arms.
b) between Earth and the Galactic center.
c) outside the luminous part of the Milky Way Galaxy.
d) within the bulge.
e) at the galactic center.
c) outside the luminous part of the Milky Way Galaxy.
While much of the mass of our Galaxy lies within the bright spiral arms, the majority of the mass actually lies outside the luminous part of the Milky Way Galaxy.So the correct option is c.
The Milky Way Galaxy is a vast and expansive collection of stars, gas and dust that spans the universe. It is estimated to contain between 200 and 400 billion stars, making it one of the largest galaxies in the universe. The Milky Way is a spiral galaxy, meaning that it is composed of a central bulge surrounded by four main spiral arms. The luminous part of the Milky Way Galaxy, which is visible from Earth, lies within the spiral arms.
However, the majority of the mass of our Galaxy does not lie within the luminous part of the Milky Way Galaxy. Instead, much of the mass of the Milky Way lies outside the visible part of our Galaxy. This mass is found in the form of dark matter, which is an invisible form of matter that does not emit any light. Dark matter makes up around 85 percent of all the matter in the Universe and is believed to be responsible for the structure and evolution of galaxies.
The rest of the mass of our Galaxy is located within the bulge at the center of the Milky Way, as well as between Earth and the Galactic center. This mass is made up of stars, gas, dust and other forms of matter. While much of the mass of our Galaxy is invisible, it is still an important component of the Milky Way. Without this mass, the structure and evolution of the Milky Way would be drastically different.
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