The correct option is (d). none of the above is correct .For the "unemployed" category.
According to the Organization for Economic Co-operation and Development (OECD), unemployment is defined as those over a certain age (often 15) who are not now employed or self-employed but are nonetheless currently available for work during the reference period.The number of unemployed people as a percentage of the labour force serves as a proxy for unemployment, which is expressed as the unemployment rate (the total number of people employed added to those unemployed).To know more about unemployed
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in an oscillator consisting of a spring and a block, the amount of elastic potential energy is at its maximum when:
For 1/4 value of r is the potential energy equal to the total energy.
What is potential energy?Potential energy is the form of energy that a object gain.
first want to find the value of our, what value of R is the potential energy equal to the total energy? So you are is equal to negative 1/4 pi epsilon naught E squared over R. Which is the potential energy. And E. This is a total energy. So we just set these two values equal to each other. So negative 1/4 pi epsilon naught E squared over R. Is equal to negative M. E. To the fourth divided by eight E squared and squared each squared and R is equal to two. So we can go ahead and solve this. We get R. Is equal to two. Absolutely not H squared divided by pi M. R. E squared. And actually this is just two times A. So the radius is to a. Now part B. We want to find the probability of electron being found in this classically forbidden forbidden region are greater than the classical turning point. So we need, so first of all let's look at the ground state wave function which is one over squared pi a cubed times E. To the negative are over A. This is what will be needed to integrate to find the probability. So the probability goes from R. is equal to two way to sigh.
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Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences. What is the leading hypothesis for Venus's lack of water? (a) Venus formed closer to the Sun and accreted very little water. (b) Its water is locked away in the crust. (c) Its water molecules were broken apart, and hydrogen was lost to space
(c) Its water molecules were broken apart, and hydrogen was lost to space.
The evidence that the Venus once used to have water was the deuterium to hydrogen ratio in the atmosphere of Venus is about 150 times of earth.
Proofs are Venus must have started with oceans worth water.
The water is now escaped because when the UV rays from the sun as fallen upon the water the water molecules were broken and hydrogen went to the space.
And therefore, there is no water now present on the planet Venus.
scientist are still finding ways to discover life on the planet Venus and other planets.
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A box with mass 15 kg is pulled up an inclined plane as illustrated in the figure. What magnitude of force, F, must be applied to the box in order to move it up the ramp at constant speed if the coefficient of kinetic friction between the box and ramp is 0.115?
Answer:
o99i
Explanation:
what is the smallest one-dimensional box in which you can confine an electron if you want to know for certain that the electron's speed is no more than 10 m/sm/s ?
An electron may be contained in a cage no smaller than 7 m in length.
An electron's composition.It is possible for an electron to be free or linked to an atom. An electron is a negatively charged subatomic particle (not bound). There are three distinct types of particles in an atom: neutrons, reactors, and then an electrons that is attached to an electron.
What purposes serve electrons?To create cross-platform desktop apps using HTML, CSS, and JavaScript, GitHub created the open source package called Electron. By fusing Node and Chromium, Electron achieves this. Apps may be bundled for Linux, Windows, and Mac using a single runtime that supports JavaScript.
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a 46 g marble moving at 1.9 m/s strikes a 23 g marble at rest. assume the collision is perfectly elastic and the marbles collide head-on. part a what is the speed of the first marble immediately after the collision?
The speed of the first marble immediately after the collision (assuming it is a perfectly elastic collision) is 0.63 m/s.
In physics, an elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remain the same. In an ideal, perfectly elastic collision, there is no net conversion of kinetic energy into other forms such as heat, noise, or potential energy.
How to calculate the speed of the first marble after the perfectly elastic collision?
The formula for a perfectly elastic collision as follows :
M₁ * U₁ + M₂ * U₂ = M₁ * V₁ + M₂ * V₂
1/2 * M₁ * U₁² + 1/2 M₂ * U₂² = 1/2 M₁ * V₁² + 1/2 M₂ * V₂²
Where
M1 = mass of first marble
M2 = mass of second marble
U1 = initial speed of first marble
U2 = initial speed of second marble
V1 = speed of first marble after collision
V2 = speed of second marble after collision
From the question given :
M₁ = 46g
M₂ = 23g
U₁ = 1.9m/s
U₂ = 0m/s
V₁ = (M₁ - M₂ / M₁ + M₂) * U₁ + (2M₂ / (M₁ + M₂)) * U₂
= (46 - 23 / 46 + 23) * 1.9 + 0
= 0.63 m/s (rounded)
Therefore, the speed of the first marble after its perfectly elastic collision will be 0.63 m/s.
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You make yourself and your friend a cup of hot chocolate and add vanilla ice cream. You quickly enjoy yours, but your friend takes a long time to come, so you get to observe theirs as a science experiment.
In what direction does the heat flow? (2 points)
Describe how the kinetic energy of the hot chocolate changes once you add the ice cream. (2 points)
How does the kinetic energy of the ice cream change once you put it in the hot chocolate? (2 points)
What happens to the temperature of each substance? Be specific. (2 points)
When will the temperature of the ice cream and the hot chocolate stop changing? (2 points)
The answers include the following;
The direction in which the heat flows is from hot chocolate to the vanilla ice cream. The kinetic energy of the hot chocolate decreases once you add the ice cream.The kinetic energy of the ice cream increases once you put it in the hot chocolate.The temperature of each substance will exchange heat till an equilibrium is reached.The temperature of the ice cream and the hot chocolate will stop changing when there is uniformity.What is Temperature?This is referred to as the degree of hotness or coldness of a substance and it is influenced by thermal energy.
The direction in which the heat flows is from hot chocolate to the vanilla ice cream and the kinetic energy of the hot chocolate decreases once you add the ice cream.
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a metal bar magnet has a magnetic field in the region of space around it. the magnetic field is due to * 1 point captionless image a) magnetic monopoles embedded in the metal. b) a hidden voltage source in the metal. c) the motion of charged particles in the atom d)an electric current that runs along the length of the magnet
A metal bar magnet has a magnetic field in the region of space around it. The magnetic field is due to an electric current that runs along the length of the magnet.
The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.
This region is called the magnetic field. If an iron object is near a magnet, but is not within the magnetic field, the object will not be attracted to the magnet. When the object enters the magnetic field, the force of the magnet acts, and the object is attracted.
Inside a bar magnet, since magnetic field are continous, they point from the south pole to the north pole as the magnetic enters from south pole from the outside and emerge from the north pole.
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we measure the magnitudes of the electric field and magnetic field at a given instant and at a given point in an electromagnetic wave. how are the magnitudes related to the speed of light
The Magnitude of electric and magnetic field is related by its ratio to speed of light .
In an EM wave, the electric field is a loop and oscillates with time, without charge it is strange. Normally, electric fields are lines from positive charge to negative charge. Due to the changing electric field, an associated magnetic field develops according to Maxwell's laws.A neutral nature never arises. The fields scatter when they encounter charged particles, which is called reflection or absorption of EM waves.In classical theory, in the absence of charged matter ,electromagnetic waves are vacuum solutions of Maxwell's equations; you can add the vacuum solution to any other solution and the result will still be a valid solution.In the presence of charged matter, if that matter is not rigid (that is, if it responds to electrostatic or magnetic forces), things change. If a magnetic field is introduced, it can rearrange the charged matter and this in turn would affect how electromagnetic waves propagate through that medium. For example, the presence of galactic magnetic fields affects interstellar dust, which in turn can polarize light, giving us a means to probe galactic magnetic fields by looking at the polarization of distant starlight.[tex]\frac{E}{M} =C[/tex]E=electric field , M=Magnetic field , C=speed of light
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consider the properties you can deduce from the periodic table. what do you know about the noble gases? select all of models that represent noble gases.responses
Because of their electrical configurations, they have been given the more apt name, Group 18. Possibilities Both a C are really the isotopes since their outer layer is completed but they do not interact with anyone.
Noble gases: what are they?Noble gases are all seven of the basic components that make up Division 18 of the chemical elements. The constituent elements include hydrogen, xenon, radon, atoms, mercury, radon, and oganesson (Og). Inert, flavorless, unscented, and nonflammable gases are known as noble gases.
What noble gas is gold?This definition classifies copper, silver, and gold as noble metals. A superb metal is also one that is resistant to corrosion and oxidation.
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why does neptune appear blue and jupiter red? why does neptune appear blue and jupiter red? neptune is hotter, which gives bluer thermal emission. methane in neptune's atmosphere absorbs red light. neptune's air molecules scatter blue light, much as earth's atmosphere does.
Methane in Neptune's atmosphere absorbs red light.
Why does Jupiter appear reddish brown while Neptune appears blue?Methane, which makes up 2% or less of Neptune's atmosphere, is what gives the planet its blue tint.
Neptune: Is it a gas or a water?Like Uranus, Neptune is an icy giant.It resembles a gas giant.It is composed of a solid core the size of Earth flowing over a soup or stew of water, ammonia, & methane.A dense, windy atmosphere surrounds Neptune.
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creating and transmitting currents is central to the function of neuron physiology. t or f
Creating and transmitting currents is central to the function of neuron physiology. This is true statement.
What is neuron physiology?The neurons, which make up the nervous system's structural units, can be electrically excited. Numerous anatomically diverse types of nerve cells have developed to participate in numerous organismal processes.
The motor neurons in the spinal cord and brain receive signals from the spinal cord and brain that cause the muscles to start contracting, which affects the glands. A cell body and the neural processes, or axon and dendrites, make up the basic components of a neuron.
The voltage of neurons as they move from the soma, dendrites, and axon changes. In sensory neurons, external inputs open ion channels, causing action potentials to pass from the axon to the soma. The axons, which are the mechanism by which nerve cells communicate with one another neurons, are often used by neurons to transmit signals in the form of action potentials.
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how did the first generation of stars differ from modern generations of stars? they were very short lived all of these answers are correct they were extremely luminous they were far more massive
They have been a lot greater big than maximum stars born today. Angular momentum performs an crucial position in big name formation.
The first-era stars are predicted to be very big, however the 2d-era stars may be low-mass items even though they're shaped from metal-loose gas. 1. Formation of the First Stars withinside the Universe Recent research tested that the primary stars withinside the universe are very big.
They shaped in small protogalaxies that advanced from density fluctuations withinside the early universe. and helium, the physics of big name formation desired the advent of our bodies that have been in many instances greater big and luminous than the sun. stars exploded as supernovae, dispersing heavy factors all through the universe.
As the Earth orbits across the Sun, constellations pass slowly to the west over the path of a year and we see special components of the sky at night time because, because the seasons change, we're searching in a special route in space.
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what is the magnitude of the emf induced between the two sides of the shark's head?
The induced emf between the two sides of the shark's head is 44*10-6 volts. the process whereby changes in magnetic flux cause a coil to develop a potential difference.
Here's the complete question:A scalloped hammerhead shark swims at a steady speed of 1.0 m/s with its 83-cm-wide head perpendicular to the earth's 52 μT magnetic field. What is the magnitude of the emf induced between the two sides of the shark's head? Express your answer using two significant figures.
How to solve ?Given:
The speed of scalloped hammerhead shark is: va=1.0ms
The width of head is:
wa=83cm=0.83m.
The magnetic field is:
Ba=52μT=53×10−6T
The expression for the change in area through which magnetic field moves is,
ΔAa=Δla.wa
Here,
Δla and wa are change in length and width respectively.
The expression for the speed of scalloped hammerhead shark is,
va=Δla/Δt
Here ,
Δt is time interval.
The expression for the magnetic flux is,
Δϕa=Ba.ΔAa
The expression for the induced emf by using the Faraday's law is,
ea=Δϕa/Δt
Solving for the induced enf:
ea=Ba.Δla.wa/Δt
⟹Ba.wa.Δla/Δt⟹Ba.wa.va
The expression for the magnitude of emf induced between the two sides of shark's head is,
ea=Ba.wa.va
Solving for the magnitude of emf induced between the two sides of shark's head:
ea=53×10−6T×0.83m×1.0m/s⟹43.99×10−6V⟹≈44×10−6V
Thus the magnitude of emf induced between the two sides of shark's head is 44×10−6V.
What distinguishes induced emf from electromagnetic fields?According to Faraday's Law, if a magnetic flux across a loop changes, an induced emf results. The term "motional emf" is used to describe an emf that is changing because a conductor is moving in some way in a magnetic field.
What is another name for EMF?When no current is flowing, electromotive force equals the potential difference. the fact that both EMF and potential difference (V) are expressed in volts, but they are not the same thing.
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different masses are hung on a spring scale calibrated in newtons. the force exerted by gravity on 1.0 kg is shown in the image below in newtons. an image of a spring scale with a 1 kilogram weight attached. the scale reads 9.8 n. what would be the force exerted by gravity on 9.0 kg? 9.0 n 9.8 n 81 n 88 n
The force exerted by gravity on a mass of 6.5 kg will be equal to 64 N. Hence, option A is correct.
What is Force?Any operation that has the ability to alter, maintain, or modify a body's motion is considered a force in mechanics. Isaac Newton's Principia Mathematica has three laws of motion that are usually used to demonstrate the idea of force (1687). A body at rest or consistently moving in a straight path is said to remain in that state before a power is applied to it, according to Newton's first law.
Now, let's find out the force exerted by gravity,
Given,
Mass, m = 6.5 kg
Use the value of acceleration due to gravity (g) as 9.8 m/s².
f = 6.5 × 9.8
f = 63.7 or,
f = 64 N.
Therefore, the force exerted by the gravity will be equal to 64 N.
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find the volume of the given cylinder. use 3.14 for π and round the nearest tenth
Answer:
The required volume of the given cylinder will be 1607.7 cubic inches.
What is the volume of a cylinder?
The volume of a cylinder is equal to the product of the area of the circular base and the height of a cylinder. The volume of a cylinder is defined as the space occupied by the cylinder as the volume of any three-dimensional shape is the space occupied by it
V = πr²h
where 'r' is the radius of the base (circle) of the cylinder
'h' is the height of the cylinder
Given that the radius and height of a cylinder are 8 in. and 8 in. respectively
The volume of a cylinder V = πr²h
As per the given question,
Here r = 8 in. and h = 8 in.
The of a cylinder = 3.14 × (8)² × (8)
Apply the multiplication operation,
The volume of a cylinder = 1607.7 cubic inches
Therefore, the required volume of the given cylinder will be 1607.7 cubic inches.
Question 8 of 10 What effect does a catalyst have on the energy of a reaction system? A. It increases the initial energy of the reactants. B. It reduces the final energy of the products. C. It reduces the activation energy. D. It has no effect on the energy of a reaction system.
Answer: It reduces the activation energy.
Explanation:
A catalyst is a material that, without being consumed by the process, speeds up a chemical reaction or decreases the temperature or pressure required to initiate one. The addition of a catalyst to a reaction is known as catalysis.
The bonds holding together the atoms in molecules are ruptured, altered, and repaired during a chemical reaction, recombining the atoms to form new molecules. By decreasing the activation energy, the energy hurdle that must be cleared for a chemical reaction to take place, catalysts improve the efficiency of this process. As a result, catalysts facilitate the formation of chemical bonds between atoms to create novel combinations and new compounds. Chemical processes are accelerated and become more energy-efficient when catalysts are used.
a satellite is orbiting the earth at an altitude of 290 km. what is the approximate size of the smallest object on earth that an astronaut in the satellite can resolve if the diameter of her pupil is 5.00 mm and the wavelength of light is assumed to be 490 nm?
34.672 m is the approximate size of the smallest object on earth that an astronaut in the satellite can resolve.
L = satellite is orbiting the earth at an altitude of 290 × [tex]10^{3}[/tex] m
λ = wavelength of light is 4.90 × [tex]10^{-7}[/tex] m
d = diameter of her pupil is 5 × [tex]10^{-3}[/tex] m
θ = 1.22 × λ/d= y/L
So, y = 1.22× (λ/d) × L
y = 1.22× (4.90 × [tex]10^{-7}[/tex] m /5 × [tex]10^{-3}[/tex] m) × 290 × [tex]10^{3}[/tex] m
y = 34.672 m
Hence, 34.672 m is the approximate size of the smallest object on earth that an astronaut in the satellite can resolve.
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7. Which of the following is not an agent of erosion? A. glacier B. rocks C. water D. wind 8. Which of the following cannot be considered as a role of gravity in erosion? A. It moves glaciers down slope.B. It loosens the land materials, c. In mountains, it moves down large slabs of rocks. D. It acts as agents of mass wasting like landslides, fall, mudflows, and avalanches, 9. What term refers to the process wherein rocks break down into pieces? A. deposition B. erosion C. mass wasting D. weathering 10. What process of chemical weathering is involved when water reacts with one mineral to form a new mineral like feldspar into clay? A. dissolution B. hydrolysis C. oxidation D. pressure 11. What type of mechanical weathering occurs when freezing of water and repeated thawing in cracks of rocks? A. abrasion B. frost wedging C. oxidation D. solution 12. Which of the following does NOT cause chemical changes in the composition of rocks? A. abrasion B. dissolution C. hydrolysis D. oxidation 13. What chemical reaction takes place during rusting of iron? A. abrasion B. dissolution C. hydrolysisD. oxidation
7 A. glacier, 8 B It loosen the land material, 9 D Weathering, 10 B Hydrolysis 11 B Frost wedging, 12 A abrasion,13 D oxidation.
Any chemical reaction in which a water molecule breaks one or more chemical bonds is called hydrolysis (/hadrlss/; from the Ancient Greek hydro-, "water," and lysis, "to unbind"). When water is the nucleophile, the phrase is used generically to refer to substitution, elimination, and solvation processes. The cleavage of biomolecules known as biological hydrolysis occurs when a water molecule is consumed in order to cause the division of a bigger molecule into its component parts. Saccharification is the process of hydrolyzing a carbohydrate into its individual sugar molecules, as occurs when sucrose is broken down into glucose and fructose.
A condensation. reaction, in which two molecules. combine to form a bigger. one and expel. a water molecule, can be reversed. by a hydrolysis. reaction. In order to break down, hydrolysis adds water.
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You pick up a 2.6 kg can of paint from the ground and lift it to a height of 1.7 m .
A: How much work do you do on the can of paint? Express your answer using two significant figures.
B: You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time? Express your answer using two significant figures.
C: Your friend decides against the paint, so you lower it back to the ground. How much work do you do on the can as you lower it? Express your answer using two significant figures.
Work done in each case is 43.36 N ,-43.36 N , 41.97 N/m
What is work done ?The definition of the work performed by a force is the sum of the products of the magnitude of this force acting in the displacement's direction displacement. W = F x d.
(a) W = F × d
F = ma = 2.6×9.81
W = 2.6×9.81×1.7 = 43.36 J
Work done is 43.36 N
(b) Zero
because distance is zero in this case
W = -43.36 J
Work done is -43.36 N
(c) KE = 0.5×m×[tex]v^{2}[/tex] = 0.5×1770× [tex]120^{2}[/tex] = 1.274×[tex]10^{7}[/tex] J
0.5×m×[tex]v^{2}[/tex] = 0.5 ×k× [tex]x^{2}[/tex]
k = 1.6×[tex]2.1^{2}[/tex]/[tex]0.41^{2}[/tex] = 41.97 N/m
Work done is 41.97 N/m
Work done in each case is 43.36 N ,-43.36 N , 41.97 N/m
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For vibrational motion, what term denotes the maximum displacement from the equilibrium position? O wavelength O frequency O period O amplitude Submit Request Answer
Amplitude X is the name given to the largest departure from equilibrium. It depends on the type of oscillation on the units for amplitude and displacement.
The maximum displacement or distance that a point on a vibrating body or wave can move is known as the amplitude in physics and is calculated from the position where the point is at equilibrium. The length of the vibration route is divided in half by this value. Amplitude is the largest deviation from a vibrating body's mean position. The mass is changing direction while it is at its location of greatest displacement, hence velocity is zero.
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2a. (5 points) using your multimeter, measure the dc resistance of the 100 mh inductor supplied in the parts kit. draw a model for the real inductor that includes this resistance. compute the maximum time constant for this component. do you think you could see the change of current with time with your multimeter?
The maximum time constant for this component is: 0.974 m/sec
What is multimeter?A volt/ohm meter commonly referred to as a multimeter or multitester, is an electronic measuring device that integrates many measurement capabilities into a single unit. A standard multimeter could include capabilities to measure voltage, current, and resistance, among other things.
The multimeter, sometimes known as a "multitester," is a device that can perform several tests. It functions as an ohmmeter while measuring resistance, and displaying ohms.
Given that,
DC resistance ,
L = 100 mh
R = 102.6 Ω
Now, time constant, T = L/R
or, T = (100/ 102.6) m/sec
or, T = 0.974 m/sec
Thus, change of current will occur but this is very less because of the temperature difference.
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how many coulombs of electric charge are required to deposit 25.0 g cu(s) at the cathode in the electrolysis of cuso4(aq)?
75984 coulombs of electric charge are required to deposit 25.0 g cu(s) at the cathode in the electrolysis of cuso4(aq)
The molar. mass of Cu. is 63.5 g/mol
25.0 g Cu corresponds to 25/63.5 = 0.3937 mol
Cu ²+ + 2e- → Cu
1 mole of Cu is deposited by 2 moles of electrons.
0.3937 moles of Cu is deposited by 2 × 0.3937 = 0.7874 moles of electrons.
Coulombs of electric charge required = 0.7874 × 96500 = 75984 coulombs
A promising method for producing carbon-free hydrogen from nuclear and renewable sources is electrolysis. Water is split. into hydrogen. and oxygen by a process. called electrolysis. In a device known as an electrolyzer, this reaction occurs. The size of an electrolyzer can vary, from small, appliance-sized machinery that is ideal for small-scale distributed hydrogen production to big, central production facilities that could be connected directly to renewable or other non-greenhouse gas-emitting sources of energy generation.
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The charge of the electron is -1.602x10-19 C. The charge of the proton is the same except positive. An electron and proton are separated by a distance. What is the distance, r; such that the electric force between them is 1.000 N? X l0l ?] m Hint: Ke = 8.99x109 N-m?/C2. Coefficient (green) Exponent (yellow) Enter
An electron and proton are separated by a distance, and the distance is: 1.517 × 10⁻¹⁴ m.
What is the charge of electron?Positively charged particles include electrons. The magnitude of the negative charge is 1.602 x 10⁻¹⁹ C.
The electron, the lightest known stable subatomic particle, is regarded as the fundamental representation of electric charge.
Given that,
Charge of the electron is 1.602 x 10⁻¹⁹ C
electric force between them is 1.000 N
Electrostatic force between electron and proton:
F = [K × q(p) × q(e)] / r²
or, r² = [K × q(p) × q(e)] / F
or, r² = (8.99 × 10⁹ N.m²/C²) × (1.602 × 10⁻¹⁹ C)²
or, r = 1.517 × 10⁻¹⁴ m
here. co-efficient = 1.517 and exponent = -14
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the wave velocity of the first overtone frequency of a string is 75 m/s. what is the wave velocity of the fundamental frequency? opensax
The wave velocity of the fundamental frequency is 75 m/s.
The wave velocity of the fundamental frequency of a string can be calculated using the equation:
Wave Velocity = 2 x Overtone Frequency x Wavelength
Substitute the given values in the equation
Wave Velocity = 2 x (1/2 x 75 m/s) x Wavelength
Solve for the wavelength:
Wavelength = Wave Velocity / (2 x (1/2 x 75 m/s))
Substitute the given wave velocity in the equation:
Wavelength = 75 m/s / (2 x (1/2 x 75 m/s))
Simplify the equation:
Wavelength = 75 m/s / 75 m/s
Solve for the wavelength:
Wavelength = 1 m
Substitute the wavelength in the equation:
Wave Velocity = 2 x (1/2 x 75 m/s) x 1 m
Solve for the wave velocity:
Wave Velocity = 75 m/s
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a muon is traveling at 0.4c0.4c relative to a laboratory frame of reference. the speed of the muon is doubled to 0.8c0.8c. part a what happens to the momentum of the muon in the laboratory frame of reference?
When measured in a laboratory frame of reference, the momentum more than doubles to that of the muon.
A muon and an electron are two different particles.Compared to the electron, muons are 200 times heavier. They are intriguing because of their higher mass, but they are also unstable because of it. While muons only last for two microseconds, or two millionths of a second, before decaying, electrons persist for an infinite amount of time.
For what purposes do muons?Nuclear power reactors with damage can be seen inside using muon technology. In order to look into big, thick monuments like the Egyptian pyramids, scientists employ muons in their archeological research.
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In this problem, we will consider the following situation as depicted in the diagram: A block of mass m slides at aspeed v along a horizontal smooth table. It next slides down a smooth ramp, descending a height h, and thenslides along a horizontal rough floor, stopping eventually. Assume that the block slides slowly enough so that itdoes not lose contact with the supporting surfaces (table, ramp, or floor). You will analyze the motion of the block at different moments using the law of conservation of energy. which word in the statement of this problem allows you to assume that the table is frictionless?
In the problem, it was stated that "a box of mass m slides at a speed v along a horizontal, smooth table", the word "smooth" allow us to assume that the table is frictionless.
Frictionless surface is a surface with little to almost none friction. Frictionless surface alllows the force acting on any object which makes it difficult fo the object to slide or the friction force is almost zero or negligible. In the real world, there is no such a thing called frictionless surface, artificially the smoothest surface will have some friction at some locations.
Friction force is the force that opposes the sliding movement of an object accross another object or surface. The friction force direction will always be the opposite of the motion of an object. Friction force can be divided into 2 kinds:
Static frictionKinetic frictionStatic friction is the friction force working on an object when an object is not moving. Static friction keeps an object stay still and resists any force working on an object. However, when the force given to an object increase and the object start to move, static friction is no longer working in the system.
Kinetic friction is the friction force working on an object when an object is moving. Kinetic friction allows an object to slow down when the force is released.
Generally, static friction is greater than kinetic friction.
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Complete Question:
In this problem, we will consider the following situation as depicted in the diagram (Figure 1) : A block of mass m slides at a speed v along a horizontal, smooth table. It next slides down a smooth ramp, descending a height h, and then slides along a horizontal rough floor, stopping eventually. Assume that the block slides slowly enough so that it does not lose contact with the supporting surfaces (table, ramp, or floor).
You will analyze the motion of the block at different moments using the law of conservation of energy.
(Please refer to the diagram below)
Which word in the statement of this problem allows you to assume that the table is frictionless?
Ultrasound waves at intensities above 104 W/m2 can do serious damage to living tissues. a) If 104 W/m2 corresponds to 160 dB, what is the sound intensity level, in decibels, of ultrasound with intensity 105 W/m2, used to pulverize tissue during surgery? β =
Ultrasound waves at intensities above 104 W/m² can do serious damage to living tissues, 104 W/m² corresponds to 160 dB, 170 dB is the sound intensity level, in decibels, of ultrasound with intensity 105 W/m²,
What is ultrasound waves?An ultrasonic scan employs high-frequency sound waves to generate a picture of a person's interior body components. Ultrasound is frequently used by medical professionals to examine a growing foetus (unborn child), a person's abdominal and pelvic organs, muscles, tendons, heart, and blood vessels.
Given that,
Ultrasound waves at intensities above 10⁴ W/m² corresponds to 160 dB.
ultrasound with intensity 10⁵ W/m².
Sound intensity levels in dB is defined as:
β = 10 log [tex](\frac{I}{I_0})[/tex]
where [tex]I_0[/tex] is the reference intensity levels.
so, β₁ - β₂ = 10 log [tex](\frac{I_1}{I_0})[/tex] - 10 log [tex](\frac{I_2}{I_0})[/tex]
or, β₁ - β₂ = 10 log [tex](\frac{I_1}{I_2})[/tex]
or, β₁ = β₂ + 10 log [tex](\frac{I_1}{I_2})[/tex]
so, for β₂ = 160 dB, I₂ = 10⁴ W/m² , I₁ = 10⁵ W/m²
or, β₁ = β₂ + 10 log [tex](\frac{10^4}{10^5})[/tex]
or, β₁ = 160 + 10 log [tex](\frac{10^4}{10^5})[/tex]
or, β₁ = 170 dB.
Thus, the sound intensity level is: 170 dB.
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if there is going to be a total lunar eclipse tonight, then you know that:
If there is going to be a total lunar eclipse tonight, then you know that the Moon's phase is full.
What is a lunar eclipse?The full moon phase is when lunar eclipses take place. When the Moon and Sun are exactly lined up, Earth's shadow falls on the Moon's surface, darkening it and occasionally turning it a brilliant red over the course of a few hours. Every lunar eclipse can be seen from half of the planet.
Total lunar eclipses occur when the moon is entirely submerged in the umbra of the earth's shadow. Hence, total lunar eclipse occurs when the Moon's phase is full.
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A piece of putty moving with 2 units of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both are set in motion with a combined momentum that is.
Following the putty's adhesion to a ball, both are propelled forward by the combined momentum of two units.
What is meant by momentum in physics?Momentum was defined as the amount the the body's motion. As momentum depends on both velocity and the direction of a body's motion, it is quantified by "mass velocity". Since velocity is indeed a vector and mass is a scalar, momentum is a vector. Mass times speed equals momentum.
What is momentum in real life?Quantity may be assessed in the this scenario since a moving item has mass and momentum. If such an object is stationary, it has no momentum.
Briefing:The system's momentum is conserved in this instance of an inelastic collision.
Here, the principle of momentum conservation will be applied.
As either a result, following a collision, the combined momentum will equal the initial momentum. The answer "2 units" is the one that is right.
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a box is dropped onto a conveyor belt moving at 1.9 m/s. the acceleration of gravity is 9.8 m/s 2 . if the coefficient of friction between the box and the belt is 0.6, what distance does the box move before it moves without slipping? answer in units of m
distance does the box move before it moves without slipping is 0.3580m.
Calculation :
F=μmg
a=F/m =μg
From v² =u²+2as
0=2²−2(μg)s
s=4/(1.9×0.6×9.8)
=0.3580m
What is distance? Distance is the overall movement of an object, regardless of direction. Distance can be defined as the amount of ground an object has moved, regardless of its start or end point.
Hamming distance calculates the distance between two binary vectors, also known as binary strings or bitstrings for short.
Euclidean Distance calculates the distance between two real-valued vectors.
Minkowski Distance calculates the distance between two real-valued vectors.
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