When a particle may pass through a potential energy barrier with an energy greater than its kinetic energy, this process is known as tunnelling in quantum mechanics. This remarkable characteristic of tiny particles is crucial in the explanation of a number of scientific processes, including radioactive decay.
How does quantum tunnelling work?An atom or subatomic particle might appear on the other side of a barrier that should be impossible for it to cross due to a phenomena known as quantum tunnelling. It's as though you were out walking when you came across.
Because in this straightforward system, if a particle's energy is below the potential, it will always bounce back, and if it has a higher energy, it will always pass.
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although we have discussed single-slit diffraction only for a slit, a similar result holds when light bends around a straight, thin object, such as a strand of hair. in that case, a is the width of the strand. from actual laboratory measurements on a human hair, it was found that when a beam of light of wavelength 632.8 nm was shone on a single strand of hair, and the diffracted light was viewed on a screen 1.25 m away, the first dark fringes on either side of the central bright spot were 5.22 cm apart.
When the light bends around the strand of hair was of thickness 30.3*10^-6 m or 30.3 μm then beam of light faced diffraction.
Diffraction refers to what happens to a wave when it hits an obstacle. The key to understanding diffraction is a very simple observation first due to Huygens in 1678. Say a wave arrives at an opaque screen with a little hole in it.
The key point is that the receiver does not care about whatever happened on the other side of the screen. All that matters at is what the wave was like as it passed through the hole.
The great thing about this way of thinking about diffraction is that, since the wave equation is linear, you can use this trick for any number of holes. You simply add the amplitude for the waves produced from a “source” at each hole.
The condition for minimum in single slit diffraction is,
sinФ=mλ/d
Here, mis order, λ is the wavelength of light, d is slit width.
For first order minimum put m = 1
sinФmin=(1) (632.8*10m)/d
The width of the central maximum is,
2y=5.22×102 m
y=2.61×102 m
The expression for the distance between central maximum to the first minimum is, y= L tanФ
tan Ф= y L
Here, is the angle of diffraction of light which will produce first minimum.
tan Ф=2.61×10-2 m 1.25 m
tan Ф=1.196° which is very small.
Thus, for small angles tan 6, = sine
tanФ=sinФ
(sin 1.196°)= (1)(632.8*10 m) d
d=30.3*10^-6 m or 30.3 μm
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You want exactly nine gallons of water, but you have only a seven-gallon bucket and a five-gallon bucket. Although you, at first, do not see how these two buckets can help, you realize that you can use them in the following way: fill the seven-gallon bucket, then pour it in the five-gallon bucket, leaving two gallons in the seven-gallon bucket. Pour out the five-gallon, pour the two gallons of water in the five-gallon and refill the seven-gallon bucket and you have a total of nine gallons of water. To solve this problem, you had to use
a. Selective comparison.
b. Selective attention.
c. Selective encoding.
d. Selective combination.
For the nine gallons of water, the correct answer is Selective combination.
Selective combination occurs when one synthesizes different information together.
Selective comparison occurs when one creates a connection between experiences and knowledge.
Selective encoding occurs when one selectively picks only relevant information.
Selective combination happens when one synthesizes one-of-a-kind records collectively. Selective contrast takes place while one creates a connection among reports and knowledge. Selective encoding occurs whilst one selectively selections only applicable information.
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a renewable resource can be question 41 options: used indefinitely. replenished by natural processes within hours to centuries. replenished by natural processes in millions of years. consumed completely if it is managed within its sustainable yield. found and used easily.
Renewable resources can be replenished by natural process within hours to centuries.
Renewable energy is energy this is constituted of herbal methods and continuously replenished. A few examples of renewable electricity are daylight, water, wind, tides, geothermal warmness, and biomass.
Plastic is made from crude oil, a nonrenewable useful resource. even though the plastic we use may be recycled, the quantity of stable waste generated by plastic is turning into a trouble.
“Sand is not a renewable aid,” Parkinson stated. “while sand is eroded from the seashore during a typhoon, it commonly accumulates in offshore regions as a very thin layer that can not be dredge again to assemble a new seaside or dune.”
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The net work done in accelerating a solid cylindrical wheel from rest to an angular speed of 5050 rev/ min is W=590. J. If the radius of the wheel is 1.10m, what is its mass?
The mass of the solid cylindrical wheel is 71.14 kg .
What is mass?
Measuring inertia, a property of all stuff that cannot be changed. What a body of matter is in essence is the resistance it provides to a change in its speed or position brought about by the application of a force.
What is acceleration ?
Acceleration is the term for the rate of change in speed. In most cases, but not always, acceleration denotes a shift in speed. An object is still moving in a circular path, but the direction of its velocity is changing, thus it is still gaining speed.
final angular speed of wheel is
w = 50 rev/m/n = 50 * 2π/ 60 = 1rev/ min = 2π/ 60 rad/s
w = 10π/6 rad/s
work done w = 590 J
radius of wheel is r = 1.10 m
as we know that work done in rotating of wheel is
W = 1/2 I W²,
Where I is moment of inertia of the wheel
moment of inertia of a solid cylindrical wheel is
I = 1/2 mr², where m is mass
∴ W = Hw/ r²w²
m= 4*590/ (1.10)² ( 10π/6) ² = 4* 590* 36/ 1.21* 100 π²
m= 71.14 kg
Therefore, mass of the solid cylindrical wheel is 71.14 kg .
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you conclude that an electromagnetic wave is passing through the region.(a) what is the direction of propagation of the electromagnetic wave?
The vibration of electric field is shifting towards +y direction as time passes. Hence, we can say that the electromagnetic wave is traveling in +y direction.
An electric field that oscillates in both space and time, coupled with an orthogonal magnetic field that has the same periodicity in both space and time, make up electromagnetic wave known as light. Maxwell originally explained this.
Light interacts with the charged particles found inside the atoms of a material as it enters them. Even while both magnetic and electric fields can be absorbed by materials, the interaction of the field of light with matter is, on average, 105 times larger than that of the magnetic field, thus, to a first approximation, we can limit our attention to the electric field's interaction with matter. when the light's electric field enters a substance and causes the electrons to migrate.
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What is the energy change taking place
when you turn on a cell phone?
Nuclear energy to thermal energy
Potential energy to chemical energy
Chemical energy to radiant energy
Kinetic energy to potential energy
Answer:
When you turn on a cell phone, chemical energy from the battery is converted into electrical energy, which powers the various components of the phone. This electrical energy can be converted into other forms of energy, such as heat or light, depending on how the phone is being used.
in fig. 12-30, trying to get his car out of mud, a man ties one end of a rope around the front bumper and the other end tightly around a utility pole 18 m away. he then pushes sideways on the rope at its midpoint with a force of 550 n, displacing the center of the rope 0.30 m, but the car barely moves.what is the magnitude of the force on the car from the rope? (the rope stretches somewhat.)
The rope's force on the car, in terms of magnitude, is [tex]8.3 *10^{3}[/tex] N
A man ties a rope firmly around the front bumper of his car and an 18-meter utility pole in an effort to free it from the mud. Then, with a force of 550 n, he pushes sideways on the rope at its middle, shifting the rope's center by 0.30 m, but the automobile scarcely moves.
At first, we evaluate the angle, then with its help of it, we shall evaluate the magnitude of the force.
Measured from the dotted line, the angle of each rope half is
θ = [tex]tan^{-1} (\frac{0.30m}{9.0m} )= 1.9[/tex]
When we examine the forces at the "kink" (where F is applied), we discover
t = 2sinθ/F = 2sin1.9/550 = [tex]8.3 *10^{3}[/tex] N
The rope's force on the car, in terms of magnitude, is [tex]8.3 *10^{3}[/tex] N
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The magnitude of the force on the car from the rope is 8.3*10³ N
Force is the amount of energy applied to displace the position of any object. This force has magnitude and direction and so is called the vector quantity.
Here, in this question,
Given,
Distance = 18 m
Midpoint force = 550 N
Displacement of the center of the rope = 0.30 m
The rope when tied then it will also show a force which is the tension force (t).
We know that tension t
t = 2sinθ / F
But we are not aware about the value of θ
so
we will first find the value of θ by
θ = tan⁻¹(0.30/0.9) = 1.9
We got the angle to be 1.9, now we can easily find the force in the rope as
t = 2 sin 1.9 / 550
= 8.3 * 10³ N
Therefore, the magnitude of the force on the car from the rope is 8.3*10³ N.
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Can any one answer number 4?
There are several methods for producing solar cells, depending on the type of cell and the materials used. Some of the most common methods include:
Crystalline silicon solar cells: These cells are made from silicon wafers that are cut from a large, single crystal of silicon. The wafers are then treated with various chemicals and processes to create the photovoltaic effect. This method is widely used because it is relatively efficient and cost-effective, although it does require a significant amount of energy and resources to produce the silicon crystals.Thin-film solar cells: These cells are made by depositing a thin layer of photovoltaic material (such as cadmium telluride or copper indium gallium selenide) onto a substrate, such as glass or plastic. The thin film is then treated with various chemicals and processes to create the photovoltaic effect. This method is less efficient than crystalline silicon, but it is more flexible and can be used to produce flexible or lightweight solar panels.Perovskite solar cells: These cells are made from a type of material called a perovskite, which is a crystalline compound that can be easily processed into thin films. The perovskite film is then treated with various chemicals and processes to create the photovoltaic effect. This method is relatively new, but it has the potential to be more efficient and cost-effective than other methods.Overall, the production methods for solar cells vary depending on the type of cell and the materials used. Some methods are more efficient
interference occurs with not only light waves but also all frequencies of electromagnetic waves and all other types of waves, such as sound and water waves. suppose that your physics professor sets up two sound speakers in the front of your classroom and uses an electronic oscillator to produce sound waves of a single frequency. when she turns the oscillator on (take this to be its original setting), you and many students hear a loud tone while other students hear nothing. (the speed of sound in air is 340 m/s.)
Answer: Some of the students who originally heard a loud tone again hear a loud tone, but others in that group now hear nothing.
Explanation: When two sources emits identical soundwaves then there is interference of waves.
In region of constructive interference (When the peaks line up with peaks and troughs line up with troughs then resultant wave has twice the amplitude of the original waves) the sound wave will be twice as loud.
In destructive interference (When peaks line up to troughs then results in cancellation of waves, hence resultant have zero amplitude) there is no sound.
Please refer to the image:
Hence, the students who were sitting in the region of constructive interference heard loud tone while the students who were sitting in the region of destructive interference heard nothing.
Regarding global warming, most scientists (including those who have advised the United Nations through the Intergovernmental Panel on Climate Change) agree that if we continue to burn fossil fuels at an accelerating rate:Climate changes will primarily hurt poor people in warm places, but the climate changes are primarily being caused by wealthier people in colder places.
Climate changes will primarily hurt poor people in warm places, but climate changes are primarily being caused by wealthier people in colder places.
Most climate scientists agree that the root cause of the current trend in global warming is the anthropogenic expansion of greenhouse gases as the atmosphere traps heat radiating from the Earth into space. I agree. Certain gases in the atmosphere prevent heat from escaping.
The production of electricity and heat from burning fossil fuels accounts for the majority of global emissions. Most electricity is still produced by burning coal, oil, or gas. Carbon dioxide and nitrous oxide are powerful greenhouse gases that coat the earth and trap the sun's heat. As a result, the amount of carbon dioxide in the atmosphere is increasing rapidly.
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which of the following statements describe an exothermic reaction? [select all that apply.]group of answer choiceshrxn < 0hproducts > hreactantsthe bonds that are broken during the reaction are stronger than the bonds that are formed during the reaction.the bonds that are broken during the reaction are weaker than the bonds that are formed during the reaction.
exothermic reaction is the bonds that are broken during the reaction are weaker than the bonds that are formed during the reaction.
Exothermic reactions are those in which the system releases heat into the environment. The temperature of the surroundings rises because it is absorbing heat from the system. Heat is released during the combustion of methane gas, making the reaction exothermic. Specifically, 1mol of methane burns to produce 890.4 kilojoules of heat energy. There are two ways to represent this data as a component of the balanced equation. First, the product side of the reaction can be used to record the amount of heat released. Another option is to write the H information as 890.4kJ, with a negative sign. In an exothermic reaction, the product's bonds are stronger than those of the reactants and have a higher bond energy.
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a small car of mass 420 kg is pushing a large truck of mass 940 kg due east on a level road. the car exerts a horizontal force of 1600 n on the truck.What is the magnitude of the force that the truck exerts on the car?
The magnitude of the force that the truck exerts on the car is same as the horizontal force exerted by the car on the truck that is 1600 N.
In physics, a force is a force that can change the motion of an object. A force can change the velocity of an object with mass. Pressure can also be intuitively described as pushing or pulling. A force has both a value and a displacement, making it a vector quantity.
Squeeze is pushing and pulling, which affects daily life because people without strength cannot open and close objects, lift arms and legs.
Reason :
This question is a simple application of Newton's third law, which states that if an object A exerts a force on an object B, then B must exert a force on A that is equal in magnitude but opposite in direction.
The car pushes against the ground with a force of 1600 N, so therefore the ground must exert a force on the car, also of 1600 N.
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three identical rocks are launched with identical speeds from the top of a platform of height 0 h . the rocks are launched in the directions indicated above. question which of the following correctly relates the magnitude vy of the vertical component of the velocity of each rock immediately before it hits the ground?
The magnitude of the vertical velocity under gravity changes by approximately 9.81 m/s each second, The option that correctly relates the magnitude, , of the vertical velocity is the option: (vy1=vy1)≥vy3.
The speed of rocks = u
The height the rocks are thrown = h₀
Rock 1; Direction = horizontal above the 45°
Rock 2; Direction =horizontal below45°
Rock 3; Direction = 0° or in the horizontal direction
The vertical component of Rock 1= -u·sin(45°)
Vertical component of Rock 2 = u·sin(45°)
Vertical component of Rock 3 = u·sin(0°) = 0
The velocity of the rock
v² = u² - 2·g·h₀
v= ±√u2-2.g.h0
v= ±√u2-2.g.h0
Therefore, the vertical velocity the rocks, Rock 1 and Rock 2, thrown with magnitude of velocity,|vy|=|u.sin45°| is the same during the vertical motion of the ball at the same height, but change only in sign
at given height h°, vy1=vy2
therefore , before the rocks hit the ground , vy1=vy2
the initial vertical velocity of rocks3, vy3=0,therefore:
∴ vy3=±√v+2.g.h°≤√u²+2.g.h°= (vy1= vy1
there fore , the correct option , we have:
vy1=vy1≥vy3
three identical rocks are launched with identical speeds from the top of a platform of height 0 h . the rocks are launched in the directions indicated above. question which of the following correctly relates the magnitude vy of the vertical component of the velocity of each rock immediately before it hits the ground?
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Determine the radius of the round strut so that the round and square struts have the same cross-sectional area and compute the critical load of each strut. Use E = 200 GPa.
The radius of strut so that the round and struts have same cross-sectional area = 2.764 mm and the critical load of a strut = 3.95*[tex]10^{-3}[/tex].
Let Radius for a round strut = 'r'
Now, Square Strut:
As, method Cross Section is 24 X 1 ([tex]mm^{2}[/tex])
So, Area, A' of cross-section = 24*1 = 24 [tex]m^{2}[/tex]
>> As, Area of round cross-section, A = pi*[tex]r^{2}[/tex]
Now, Given that, Both have same cross-section area
=> pi*[tex]r^{2}[/tex] = 24
Solving,
=> r = radius of round cross-section = 2.764 mm
>> Now, According to Buckling Criteria,
Critical Load for a Stru, Pcr = (pi*[tex]r^{2}[/tex]*E*I)/Le[tex]q^{2}[/tex]
>> Now, as both Struts or columns are simple supported at both ends
So, Leq = L = 1 m
Also, E = 200 GPa = 200*[tex]10^{9}[/tex] N/m2
Now, I = Moment of Inertia
As, For Round Strut,
I = pi*[tex]r^{4}[/tex]/4 = pi*2.7644/4 = 45.837 = 45.837*[tex]10^{-12}[/tex]
=> Pcr = pi*[tex]r^{2}[/tex]*200*109*45.837*10-12/12
Solving,
=> Pcr = 0.0905 kN (CRITICAL LOAD FOR ROUND)
>> Now, For Strut,
As, Buckling places about axis with minimum Moment of Inertia
So, Imin = a*[tex]b^{3}[/tex]/12 = 24*1*1*1/12 = 2 = 2* [tex]10^{-12}[/tex]
So, Putting every values in Critical Equation:
Pcr = p[tex]i^{2}[/tex]*200*[tex]10^{-9}[/tex]*2*[tex]10^{-12}[/tex]/12
=> Pcr = 3.95*[tex]10^{-3}[/tex] kN (REQUIRED CRITICAL LOAD STRUT)
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choose one of the theorems you have encountered that is easier to prove with a coordinate proof than with another type of proof. explain. then write a coordinate proof.
The "generalised" points on the Cartesian Plane are used in the coordinate proof to support a geometric theorem. In order to use the midpoint or distance formulas, the procedure typically entails assigning variables to the coordinates of one or more points.
Example of coordinate proof
Show or deny the existence of a parallelogram in the quadrilateral formed by the points (2, 4, 1, 2, 5, 1, and 4). It's not required to plot the points, although it does assist to visualize. You can use it to determine whether or not it resembles a parallelogram.
There is no doubt that this is a parallelogram. Remember that a parallelogram is a quadrilateral with two sets of parallel sides to demonstrate that the shape is one. Therefore, confirming that the opposing sides are parallel is one technique to demonstrate that it is a parallelogram. Remember from algebra that if two lines have the same slope, they are parallel. On the image, identify the slope of each side.
Equal slopes can be found on the opposing sides. The opposing sides are thus parallel. The quadrilateral is a parallelogram as a result.
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Which of the following statements are true for an image formed by a plane mirror?The image always appears to be located the same distance behind the mirror as the object is located in front of the mirror.A. The image formed by a plane mirror is always a real image.B. The image is always larger than the object.C. The image formed by a plane mirror is always an upright image.D. The image formed by a plane mirror is always an inverted image.E. The image formed by a plane mirror is always a virtual image.
A mirror with a plane reflecting surface is known as a plane mirror. A plane mirror creates a virtual image of the same size as the thing that is behind the mirror.
The distance between the object and the mirror is the same for both the image and the object. Thus, the appropriate choice is (b). A planar mirror always creates a true-to-life image. The image always exceeds the thing in size. An upright picture is always produced by a flat mirror. An inverted picture is always produced by a plane mirror. Every time an object is in front of the mirror, the image appears to be behind it at the same distance.
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a parallel-plate capacitor is charged to a total charge q and the battery is removed. a slab of material with dielectric constant k is inserted between the plates. the energy stored in the capacitor 1) increases 2) decreases 3) stays the same
When a dielectric slab is placed between a parallel-plate capacitor energy stored in it will decrease.
The parallel plate capacitor is a device that uses two parallel plates connected across a battery to create an electric field between them. Before the dielectric breaks down, a parallel plate capacitor can only hold a certain amount of energy. Draw a parallel plate capacitor and a slab with dielectric constant K between this capacitor. In capacitors, the energy stored is given by the formula U = 1/2 CV² where C is the capacitance and V is the potential difference. From this formula, we can tell that U is directly proportional to V. When V decreases, U also decreases. This is because dielectric reduces the electric field between the plates and decreases the energy stored in the field. Therefore, the option is 2) decreases.
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A cat jumps horizontally from a 3.2 meter shelf at a velocity of 7m/s. How far from the base of the shelf does the cat land? At what velocity does the cat land? (Magnitude and Direction).
1. The circular wire loop is curved into a circle with diameter D(t)=Do +G t. where D(t) is the diameter at time t, Do is the initial diameter, and G is the rate it grows. [10 points] a. Derive a formula for the EMF induced in the wire as it grows. [5 points] b. The wire has a circular cross section with thickness To, The wire has resistivity p. Derive the formula for the current in the wire as a function of time. (Hint : you found its resistance in the homework for chapter 27 . Be careful to change the diameter rate from B in the previous problem to G in this problem). [3 points] c. Sketch a graph of I (t)
The formula for the EMF induced in the wire as it grows is: EMF = -πG(Do2 + 2DoGt + (Gt)2)/4
The EMF induced in the wire is given by Faraday's law of induction, which states that EMF induced in a circuit is equal to the negative rate of change of magnetic flux through the circuit. Therefore, the EMF induced in the wire can be expressed as:
EMF = -dΦ/dt
where Φ is the magnetic flux through the wire loop. Since the magnetic flux through the wire loop is proportional to the area of the wire loop, we can express this as:
EMF = -d(πD2/4)/dt
Substituting in the expression for D(t), we get:
EMF = -πG(Do + Gt)2/4
Therefore, the formula for the EMF induced in the wire as it grows is:
EMF = -πG(Do2 + 2DoGt + (Gt)2)/4
b. The resistance of the wire is given by Ohm's law as:
R = ρL/A
where ρ is the resistivity of the wire, L is the length of the wire, and A is the cross-sectional area of the wire. Since the wire is a loop, the length is equal to the circumference of the loop, and the cross-sectional area is equal to the area of the wire loop. Therefore, the resistance can be expressed as:
R = ρ(πD/To)/(πD2/4)
Substituting in the expression for D(t), we get:
R = ρTo/(π(Do + Gt)2/4)
The current in the wire is given by Ohm's law as:
I = V/R
where V is the voltage across the wire. Since the voltage across the wire is equal to the EMF induced in the wire, we can substitute the expression for the EMF in the equation above to get:
I = (πG(Do2 + 2DoGt + (Gt)2)/4)/(ρTo/(π(Do + Gt)2/4))
Therefore, the formula for the current in the wire as a function of time is:
I = (Do2 + 2DoGt + (Gt)2)/(Toρ)
c. The graph of I(t) would be a parabola that is increasing as t increases. The graph will start at I(0) = Do2/(Toρ) and will rise as t increases. The rate of increase will depend on the value of G; the higher the value of G, the faster the current increases. The graph will reach a maximum value at t = (Do/G) and will then decrease as t continues to increase. The maximum value of the current is given by I = (Do2 + 2Do2/G + (Do/G)2)/(Toρ). Beyond t = (Do/G), the graph will decrease, eventually reaching I(∞) = 0.
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Consider the arrangement of two fixed point charges, equal in magnitude, shown in the figure. Which of the following statements arc correct for the initial motion of a third charge if it is released from rest in the vicinity of the two charges shown? A positive charge at point d will accelerate up. A positive charge at point b will accelerate up. A negative charge at point c will accelerate up. A positive charge at point a will accelerate toward the lower-left. A negative charge at point c will accelerate toward the lower-right.
The option (B and C) are true others are false.
What is acceleration ?
Acceleration is the rate at which velocity changes, as well as how quickly velocity changes over time. instantaneous acceleration is an acceleration at a single moment instantaneous acceleration divided by time deceleration
What is motion ?
The movement of atomic or molecular building blocks in a certain direction is referred to as molecular motion. Temperature and heat both have an impact on molecular mobility. This is so because the measurement of temperature, which reflects molecular motion and average kinetic energy, is used to determine molecular motion.
A is false; a positive charge at point d will be attracted to the nearby negative more than it is repelled by the more distance positive.
B is true
C is true
D is false; the dipole field at point a is directed up (it curves from the lower positive charge to the upper negative one, but is directly upward here) so the charge will initially accelerate up
E is false; similar to question D, the field is up at point c so the negative charge will accelerate initially straight down.
Therefore, the option (B and C) are true others are false.
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please click on the source of the point source light. position the cursor where the light emanates and click. do not worry if the target shows up elsewhere on the screen. just be sure to click from where the light source emanates.
Yellow is first positioned at the angle that is most apparent, which is 0° (90°). Black is then positioned at a 45° angle, making it the color that is most noticeable. Then, the cyan and magenta are sandwiched between these two.
Why do designers favor desktop publishers over word processors when creating documents?In comparison to word processors, desktop publishing systems are one step ahead because they give the user much more control over what will appear on the printed page and because they have specialized hardware and software, like page-makeup software, that aims to create a document that looks like the output.
Explain the definition of desktop publishing and PageMaker's function in it?Words and images are created in final pages through a process called desktop publishing (DTP).
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Which of the following statement(s) about light is/are correct?
(I) light travels faster than sound in air
(II) light cannot travel through a vacuum
(III) a rough surface cannot reflect light
(IV) an opaque material cannot reflect light
A: I only
B: I and II only
C: III and IV only
D: I, III, and IV only
The correct statements are:
light travels faster than sound in aira rough surface cannot reflect light an opaque material cannot reflect lightTherefore, option D is correct.
How does light travel?Light has always been known to travel in a straight line. Light does not bend while travelling but instead follows the shortest path between the starting point and the endpoint, which is a straight line.
The speed of light in air is the fastest known speed, hence, light travels faster than sound in air.
For a rough surface, reflected light rays scatter in all directions in a phenomena called diffuse reflection.
Diffuse reflection is when light hits an object and reflects in lots of different directions.
Hoever, for opaque materials, light absorbed and not reflected.
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The vapor pressure of liquid ethanol, C2H5OH, is 100. mm Hg at 308 K.
A sample of C2H5OH is placed in a closed, evacuated 529 mL container at a temperature of 308 K. It is found that all of the C2H5OH is in the vapor phase and that the pressure is 67.0 mm Hg. If the volume of the container is reduced to 344 mL at constant temperature, which of the following statements are correct?
Choose all that apply.
a. The pressure in the container will be 103 mm Hg.
b. Some of the vapor initially present will condense.
c. Liquid ethanol will be present.
d. Only ethanol vapor will be present.
e. No condensation will occur.
B
The statements that apply are;
The pressure in the container will be 103 mm Hg. Some of the vapor initially present will condense.Liquid ethanol will be present.What is the new pressure?We know that the pressure can be taken as the force with which the molecules of the substance are able to hit the walls of the container in this case, we need to obtain the pressure of the ethanol vapor when the volume has been reduced.
Using
P1 = initial pressure
P2 = final pressure
V 1 = initial volume
V2 = final volume
By the use of the Boyle's law we have;
P1V1 = P2V2
P2 = P1V1 /V2
P2 = 67.0 * 529/344
P2 = 103 mmHg
Thus, as the volume is reduced there would be an increase in the pressure and some of the ethanol would condense and we would have liquid ethanol in the system.
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a. does the speed of the moving object affect the amount of kinetic friction on the object? explain your answer and cite evidence to support your claim.
No, the quantity of kinetic friction on a moving item is not affected by its speed.
The consistency of the speed is more crucial than the actual speed. As was mentioned the friction force needs to be cancelled out by a constant force. The applied force would be equal to the kinetic friction force if the motion was constant in speed.
Therefore, the kinetic friction coefficient is not affected by the relative speeds of the two objects. The types of surfaces in contact are the sole factors that affect the coefficient of kinetic friction.
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why are two astronauts in space unable to hear one another
In space, there is no air to carry sound waves. Sound waves are vibrations that travel through a medium, such as air, water, or solid objects. Without a medium to carry the vibrations, sound cannot be transmitted. This is why astronauts in space cannot hear one another or any other sounds. They must use radios or other communication devices to communicate with one another.
Answer:
Below
Explanation:
Unless they have an electronic intercom in their spacesuits. there is no air between them to conduct the soundwaves.
Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be
A. 1 N.
B. 2 N.
C. 4 N.
D. 8 N.
E. 16 N.E. 16 N
The force on each charge will be 16N. Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation.
How to solve?We have the following given data,
When, r=1m,F=1N
When, r=1/4m,F=?N
Solution,
Let, the distance is r.
The magnitude of the electric force between two charges is given by the following equation:
F=k.q1.q2/r2
the charges unchanged . this proportionality relation, let find the magnitude of force at indicated distance.
Plugging in our values, we have
F=k.q1.q2/r2
F∝1/r2
F2/F1=r21/r22
F2=(r1/r2)2×F1
[Plug in the values. ]
F2=(4)
2×1 N
F2=16N
Therefore, the force will be
F2=16N
Does a charge in an electric field experience any forces?Other charges exert forces on electric charges; for instance, two positive charges may push apart or repel one another. To clarify, we say that an electric charge creates (or induces) an electric field all around it. Other adjacent charges are then affected by this electric field, applying forces to them.
What is the charge's force?In the same manner as F = mg determines the force on the mass m, F = qE determines the force on the charge. The analogy between gravity and electrostatics can be extended to include energy, but we'll get to that later.
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Bill Lauer, retired UT professor who holds six.national swimming records in the 80-84 age group, drops one of his medals in the swimming pool. He shines a flashlight into the pool onto his medal. The index of refraction of the water is 1.33. All dimensions are given in meters STATS-HELP ? NOTES T IMAGES | i Discuss. I Ulis art Description Answer Chk History Try 2-your answer of 3.44 m is not correct. How far is the medal from the edge 3.44m A of the pool? (include units with answer) 13.2 pts. 106% Angles must be measured from normal, not from water surface. try penalty tries: 2. how Detais Hints: 0.1
Distance from edge is 4.678m
We know from Shell law
nsini = n2 sinr
1 × 1.6/(1.6² + 1²)[tex]1^{1/2}[/tex] = 1.33 × p/p² + 3.9²)[tex]1^{1/2}[/tex]
P² = 0.3838p² + 0.3838(3.9)²
P = 3.078m
Distance from edge = 1.6 + 3.078 = 4.678m
the difference between two positions in terms of size or magnitude. Keep in mind that the distance traveled between two spots and the distance between them are two different things. The total length of the journey taken between two points is known as the distance traveled. Distance covered Distance, which is measured along the actual path that connects two points, is a scalar quantity. A vector measure of displacement is the distance between two points as measured along the shortest path between them.
In what direction does the Earth move in a year? Although the Earth's orbit is fairly large (the radius is close to one trillion meters), the displacement is very small (in some respects, zero). When a year has passed,
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The weight of a ball bearing, measured in milligrams, is an example of?
a. Categorical data.
b. Either categorical or quantitative data.
c. Neither categorical nor quantitative data.
d. Quantitative data.
The weight of the ball bearing measured in milligrams is an example of Quantitative data .
What is Quantitative Data ?
The Quantitative data is defined as the value of data in form of counts or numbers where each data set has unique numerical value .
Examples of Quantitative data are :
(1) Measurement of physical objects
(2) Counting the number of people in the class .
So , we can say that ,
Since the the weight of the ball bearing measured in milligram is a numerical quantity , it will be a quantitative data .
Therefore , the correct option is (d) .
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protect the attack line from minor flare-ups. get the next length to the appropriate location. the starting location for any progressive hose lay. restrict water flow. addition of lateral lines.
Lateral Lines - Protect the attack line from minor flare-ups.
Hose Packs - Get the next length to the appropriate location.
Anchor Points - The starting location for any progressive hose lay.
Hose clamps - Restrict water flow.
Hoseline tees -Addition of lateral lines.
A common variation of Flat Road is the Minuteman Road. Some ingenuity is required for loading, but loading is easier than 3-layer stacking. This load is popular because when the tube enters the structure it can be peeled off and deployed from the shoulders of the jet man.
The high flow usually straight jet main jet is created with a smooth bore tip or some type of combination nozzle. Separate the front-row players from the back-row players. One team should focus on attacking the flames directly, while the other team should concentrate on blocking the oncoming spread of the flames.
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A 240 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.100 s. If the total energy of the system is 1.00 J, find the following
(a) the force constant of the spring(b) the amplitude of the motion.
Simple harmonic motion with a period of 0.100 s is carried out by a 240 g block that is fastened to a horizontal spring.the spring's force constant is 947.4 N/m, and the motion's amplitude is 0.00211 m.
Let:
m=240g,T=0.100s,E=1.00J
ω=2π/T
=2π/0.1=62.83 rad/s
(a) k=mω²=(0.240kg)(62.83 rad/s)²=947.4 N/m
(b) E=kA²/2
A=√(2E/k)=√(2*1.0 J/947.4 N/m)
A=0.00211m
Simple harmonic motion is the repetitive movement back and forth through an equilibrium, or central, position in physics where the maximum displacement on one side of the position is equal to the maximum displacement on the other. Each entire vibration has a constant duration between them. The motion is always caused by a force that is directly proportionate to the distance from the equilibrium position and is always directed toward it. In other words, the equation F = kx, where F is the force, x is the displacement, and k is a constant The relationship is known as Hooke's law.
The oscillation of a mass attached to a vertical spring with the other end fixed in a ceiling is one particular instance of a simple harmonic oscillator.
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