A block with mass 4 kg glides at a speed of 2 m/s across a horizontal, frictionless surface. By compressing a spring in its journey, it comes to rest. The spring has a 0.2 m compress.
What process does kinetic energy undergo to become potential energy?But when you exert force on the battery, the charged particles begin to function, transforming the potential energy into kinetic energy. Similar to this, when you turn on a light, the potential energy goes through your wiring and is transformed into light and heat, both of which are examples of kinetic energy.
Given that,
Block weight: 4 kg
Speed = 2 m/s.
400 N/m force constant; we must determine the distance.
The elastic potential energy of the spring is created from the kinetic energy of the block.
Kinetic energy and potential energy in relationship
1/2mv^2=1/2kx^2
x^2=mv^2/k
put the value into the formula
x^2= 4*2^2/400
x^2=.04
x= .2m
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human activities, such as agriculture, can require altering the land. i. identify an environmental problem associated with large-scale intensive agriculture on soil.
Intensive agriculture leads to ecosystem loss and contributes to global warming.
Intensive agriculture is a farming method that uses large amounts of labor and investment to increase the yield of the land.
Human beings form an integral part of the environment and have the largest ecological footprint.The environment has suffered for thousands of years due to human activity.Intensive agriculture is generally aimed at feeding a large population of people, however, this method has contributed as one of the biggest threats to the global environment as it leads to ecosystem loss and global warming.It is responsible for 80 percent of tropical deforestation and the emergence of new parasites and the reappearance of parasites that were once under control.It reduces beneficial plants and insects and depletes and degrades the soil on which they depend.Thus intensive agriculture results in soil erosion followed by the genetic erosion of livestock and crop species worldwide.
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A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that μs = 0.41 and μk = 0.21. Draw a free-body diagram showing all the forces on the crate if the conveyer belt is speeding up to the right What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part C, what is the acceleration of the crate?
The maximum acceleration for the belt that the slipping of the crate does not appear is 2 m/s².
what is a belt?
Each rotating pulley is supported on a shaft by a belt drive, which transfers motion from one to the next.Pulley belts are often manufactured from a soft, flexible material such as rubber, although shafts and pulley wheels can be made of any material. The pulleys and belts' grooves aid in their ability to grasp and turn.The frictional force between the two surfaces increases with the amount of wrap around the curved surface, and only a portion of that force (or the resulting belt tension) is transmitted to the other end of the belt or rope when a force applies tension to one end of a belt or rope wrapped around a curved surface. The Belt friction equation can be used to model belt friction.To learn more about belt refer to
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dr. bronfman has administered her new 100-item test of abstract reasoning to a large sample of students. she is presently comparing their scores on the odd-numbered questions with those on the even-numbered questions in an effort to
Determine the test's reliability. Test-retest reliability is a metric of dependability that is acquired by giving the same test to a set of people twice over time.
How long should reliability tests be repeated?Although the ideal testing interval will vary depending on the construct being assessed, its stability over time, and the target population, several research have demonstrated that the target time of 2 weeks is the most frequently advised interval [15].
Interrater reliability between tests is it?The degree to which various raters and observers provide consistent estimates of the same occurrence is measured by inter-rater or inter-observer reliability. Test-Retest Reliability: Used to evaluate a measure's consistency across time.
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A sinusoidal transverse wave of wavelength 20 cm travels along a string in the positive direction of an x axis. The displacement y of the string particle at x=0 is given in Fig. 16-34 as a function of time t. The scale of the vertical axis is set by y s =4.0 cm. The wave equation is to be in the form y(x,t)=y msin(kx±ωt+ϕ). (a) At t=0, is a plot of y versus x in the shape of a positive sine function or a negative sine function? What are (b) y m(c) k (d) ω (e) ϕ (f) the sign in front of ω and (g) the speed of the wave? (h) What is the transverse velocity of the particle at x=0 when t=5.0 s?
The transverse velocity of the particle at x=0 when t=5.0 s is 2.5 cm/s.
y(x,t) = ymsin(kx +- wt + Ф)
(a). At t =0 , y verses x is positive sine function
(b). Ym = y5 = 4 cm
(c). k = 2Π/λ = (2*3.14)/20 = 0.314 rad cm⁻¹
(d). w = 2Πf = 2Π/T = (2*3.14)/10 = 0.628 rad/sec
(e). since at t =0 , x= 0
y = Ym sinΦ
but y = 0 from graph
sinΦ = 0 Φ=0
(f). sin in front of w is 't'
(g) . speed = v= w/k = 0.628/0.314 = 2cm/s
(h) . at x = 0
y = ym sinwt
vy = dy/dt= wym constant
= 0.628*4*cos(0.628*5)
vy = 2.5 cm/s
Wavelength is the spatial period of a periodic wave, i.e. the distance over which the wave shape repeats. [1][2] This is the distance between successive corresponding points of the same phase in the wave. B. Two adjacent peaks, valleys, or zero crossings, characteristic of both traveling and standing waves and other spatial wave patterns.
The reciprocal of wavelength is called spatial frequency. Wavelength is usually represented by the Greek letter lambda (λ). The term wavelength is also sometimes applied to the sinusoidal envelope of modulated waves and waves formed by interference of modulated waves or multiple sinusoids.
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A uniform rod of length L, mass M, is suspended by two thin strings. Which of the following statements is true regarding the tensions in the strings?
the following statements is true regarding the tensions in the strings is T2 = 0.6 T1 .
How can you tell how taut a string is?A specific strand, string, or rope is put under stress by the forces pulling on it from each end.Consider the formula for force: mass times acceleration.
What alters a string's tension?Every gauge of a string, the duration of the vibrating string, as well as the frequency of a vibrations along the duration of the string all work together to determine the overall stress on the string. Depending on what kind of metal was used to connect the strings, they may have a varying tension.
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Light of 650 nm wavelength illuminates a single slit of width 0.20 mm. (Figure 1) shows the intensity pattern seen on a screen behind the slit. You may want to review (Pages 941 - 943) . Figure1 of 1The graph shows intensity as a function of distance. Distance is measured from 0 to 3 centimeters on the x-axis. No values or units are given for the intensity on the y-axis. A large central peak is positioned at 1.5 centimeters with much smaller secondary and tertiary peaks flanking it. The width of the central peak is 1 centimeter. The secondary peaks are positioned at approximately 0.67 centimeters and 2.3 centimeters. The graph shows intensity as a function of distance. Distance is measured from 0 to 3 centimeters on the x-axis. No values or units are given for the intensity on the y-axis. A large central peak is positioned at 1.5 centimeters with much smaller secondary and tertiary peaks flanking it. The width of the central peak is 1 centimeter. The secondary peaks are positioned at approximately 0.67 centimeters and 2.3 centimeters.
Part A What is the distance to the screen? Express your answer to two significant figures and include the appropriate units.
The intensity pattern visible on a screen behind the slits can be stated to depend on the screen's distance (d=1.168m).
How to solve ?From the question we are told,
Two slits that are 0.20 mm apart are illuminated by 650 nm light. The intensity pattern shown on a screen behind the slits is depicted in (Figure 1).
Typically, the mathematical formula for the distance is as follows:
[tex]d = \sqrt{(x_2 - x_1)^2 + (y_2-y_1)^2}[/tex]
d=0.33x10^-2x0.23x10^-3/650x10^-9
d=1.168m
What purpose does the distance formula serve?The distance formula is a formula used to determine how far apart two places are from one another. The dimensions of these points are unlimited. For instance, you could need to determine the separation between two points in space, a plane, or a line (1, 2, or 3 dimensions) (3d).
How far is that?Distance is the overall, directionless movement of an object. Distance can be characterized as the amount of space an object has covered, regardless of the starting or ending location.
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What is the weight of an 11 kg crate?
When completely filled with apples, the crate weighs 15 kg; when only 2/3 full, it weighs 11 kg; and when only 1/3 full (with only 1/3 of the crate's apples), it weighs 15-11=4 kg.
What does it mean to weigh?Definition of WEIGH in the Britannica Dictionary. She measures herself every morning in order to determine how heavy she is. 1. a [+ object]: to determine (someone or something's) weight. The bananas were weighed using a scale.
what are they Weight scales?To quantify weight or mass, one uses a scale or balance. These are also referred to as weight balances, mass balances, and scales of both mass and weight.
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In a mass spectrometer, a specific velocity can be selected from a distribution by injecting charged particles between a set of plates with a constant electric field between them and a magnetic field across them (perpendicular to the direction of particle travel). If the fields are tuned exactly right, only particles of a specific velocity will pass through this region undeflected. Consider such a velocity selector in a mass spectrometer with a 0.105 T magnetic field. 50% Part (a) What electric field strength, in volts per meter, is needed to select a speed of 3.9 x 10 m/s? Grade Summary Deductions 090 Potential 100% sino cos tan) cotan asino acos atan) acotan sinho cosho tanho) cotanho Degrees Radians 7 8 9 E4 5 6 1 2 3 0. VOCAL Submissions Attempts remaining 20 per attempt) detailed view Submit Hint French I give up! Hints: O deduction per hint. Hints remaining 2 Feedback: deduction per feedback 50% Part (b) What is the voltage, in kilovolts, between the plates if they are separated by 0.95 cm?
The electric field strength in volts per meter is calculated to be 4.095 V/m.
Given that, speed v = 3.9 * 10 m/s
Magnetic field B = 0.105 T
Using the mass spectrometer velocity selector relationship between the electric field and magnetic field is,
v = E/B
Where,
v is the speed selector
B is magnetic field
E is electric field
Therefore, E = vB
E = 3.9 × 10 × 0.105
E = 4.095 V/m
Thus, electric field E is 4.095 V/m.
The question is incomplete. The complete question is 'What is the electric field strength in volts per meter?'
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Two blocks on a surface of negligible friction are attached together by a spring, as shown in the figure above. The mass of block 1 is MM, and the mass of block 2 is 2M. Block 1 is initially moving toward block 2, which is at rest. The spring compresses and decompresses in a repeated motion as the two blocks slide to the right. Which of the following statements best describes the speed of the center of mass of the two-block system?
In the absence of an external force, the total linear momentum of the system maintains conservation, indicating that the speed of the system's center of mass is constant.
This is because the spring force between the masses acts as an internal force between the two masses.
The product of an object's mass, m, and velocity, v, is known as linear momentum, and it is a vector quantity. In order to express it and refer to momentum informally, the letter "p" is utilized. You should be aware that a body's momentum always points in the same direction as its velocity vector. Because it is a conserved quantity, the overall momentum of a system is always constant. Linear momentum is measured in kg/s.
The total linear momentum prior to an object's interaction and the total linear momentum following that interaction is identical. Any system of objects that is subject to no net external force has a constant total linear momentum.
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the rod has a diameter of 40 mm. if it is subjected to the force system shown, determine the stress components that act at point a, and show the results on a volume element located at this point
In this case, we are given that the rod is subjected to the force system shown in the figure. There is a vertical force F acting on the rod at point A, as well as a horizontal force P. The rod is also subjected to a moment M about the z-axis.
To determine the stress components that act at point A, we need to consider the forces that are acting on a small volume element located at this point.
The stress on a volume element is defined as the force acting on the element per unit area. The stress components at a point can be represented by a stress tensor, which is a 3x3 matrix with nine elements. The diagonal elements of the stress tensor represent the normal stress components, while the off-diagonal elements represent the shear stress components.
To determine the stress components at point A, we need to consider how these forces are distributed over the surface of the volume element. The normal stress components can be found by considering the forces acting perpendicular to the surface of the element. The shear stress components can be found by considering the forces acting tangent to the surface of the element.
For example, the normal stress component in the x-direction at point A can be found by considering the force F acting perpendicular to the surface of the element in the y-direction. The normal stress component in the y-direction at point A can be found by considering the force P acting perpendicular to the surface of the element in the x-direction. The shear stress component in the XY-plane at point A can be found by considering the moment M acting tangent to the surface of the element.
To determine the specific values of the stress components, we would need to know the dimensions of the volume element, as well as the magnitudes of the forces and moments acting on the rod. With this information, we can use the equations of statics to solve for the stress components at point A.
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this is a record of climate from 1880 and on with measures of land and ocean temperatures around the world increasing over time.
From the 1880s to the 1910s, the yearly average worldwide temperature was roughly 13.7 °C (56.7 °F). The temperature increased by around 0.1 °C (0.18 °F) per decade from the 1920s through the 1940s.
The average worldwide temperature then remained stable until the 1980s at about 14.0°C (57.2°F). The total land and ocean temperature has risen at an average pace of 0.14 degrees Fahrenheit (0.08 degrees Celsius) every decade since 1880, according to NOAA's 2021 Annual Climate Report; however, the average growth rate since 1981 (0.18°C / 0.32°F) has been more than double that rate. NASA utilizes the years 1951–1980 as a baseline to track changes in the earth's temperature. Since the start of modern recordkeeping in 1880, the last eight years have collectively been the warmest on record. The worldwide temperature record is comprised of these annual temperature measurements.
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the free-fall acceleration at the surface of planet 1 is 12 m/s2m/s2. the radius and the mass of planet 2 are twice those of planet 1. What is the free-fall acceleration on planet 2? Express your answer using two significant figures. m/s^2.
The free-fall acceleration on the planet 2 will be 6 m/sec².
Acceleration is the rate of change of velocity with respect to time.
Also it defines the maximum capacity of a vehicle to attain its speed.Its SI unit is m/sec².As we know that acceleration due to gravity can be expressed as
g = MG / R²
M = mass of the planet
G = Gravitational constant
R = radius of the planet
For planet 1
Mass = M1 = M
Radius = R1 = R
Acceleration due to gravity = g1 = 12 m/sec²
G = g1R1²/M1
For planet 2
Mass = M2 = 2M
Radius = R2 = 2R
Acceleration due to gravity = g2 = ?
G = g2R2²/M2
Since 'G' is constant, therefore on equating both the equations, g2 can be calculated
g2 = (g1R1²/M1) * (M2/R2²)
g2 = (12R²/M) * (2M/4R²)
g2 = 6 m/sec²
The free-fall acceleration on planet 2 will be 6 m/sec².
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What type of timer would you use to measure
the period of a simple pendulum? How many
oscillations would you time?
It is easy to measure the period using the photogate timer.
What is photogate timer?Photogate timer is used to study free fall, rolling objects, collisions, and pendulums. Photogates allow for extremely accurate timing of events within physics experiments, for studying free fall, air track collisions, pendulum periods, the speed of a rolling object, among other things.
To measure the period of a simple pendulum, we set the simple pendulum into oscillation. Let's say 10 oscillations. The time to complete this oscillation is recorded. This time is divided by the no of oscillation to get the period. Period is also measured in second.
This means that period of a simple pendulum is given as T = t/n
where T is the period and t is the time to complete a given oscillation.
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which of these materials would have been more likely to 'freeze out' of the early solar nebula at a distance of venus? (i.e., which material would it not be too hot for a planet like venus to accrete)
Rock, metal, and ices comprised of substances like water, ammonia, and methane all solidified and became big enough to gravitationally pull hydrogen and helium gas from the Solar Nebula.
Does Nevada provide a solar tax credit?The Federal Solar Tax Credit, often known as the Residential Clean Energy Credit, is available to the majority of Nevadans. The price of installing solar panels can be written off by qualifying homeowners from their federal income taxes in 2022 by up to 30%.
Solar or gas is more affordable?The comparison between solar and natural gas reveals that solar is superior to natural gas in every way. Not a single one for average Australians! But it offers one key benefit for the powerful people in the fossil fuel industry.
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If two metal blocks of different masses slide freely down the same frictionless incline,
which one of the following is true?
A) They have equal accelerations
B) They have unequal accelerations, but the forces acting on them are equal.
C) The more massive block reaches the bottom first.
D) The less massive block reaches the bottom first.
E) None of these is correct.
If two metal blocks of different masses slide freely down the same frictionless incline, option a is correct.
Objects accelerate due to imbalanced forces. However, not every item accelerates at the same rate in the presence of the same imbalanced force. As a result, the speed and net force in the direction perpendicular to the plane must both be zero. Since the plane is assumed to be "frictionless," no force is applied to the block that is perpendicular to the surface by the plane. The acceleration is determined by multiplying the acceleration of gravity by the sine of the angle for a frictionless incline of angle degrees. The force of gravity is not parallel to the surface when there is an inclination. The normal force diminishes as the angle of the incline increases, which reduces the frictional force. You can increase the inclination until the thing barely starts to slip.
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Which of the following is/are accurate? (select any that apply)
a muscle cell has many nuclei
the muscle cell membrane is called the sarcolemma
muscle cells have multiple mitochondria
a muscle cells has one myofibril
The accurate statements about muscle cells are:
the muscle cell membrane is called the sarcolemmamuscle cells have multiple mitochondriaWhat are the features of a muscle cell?A muscle cell also known as a myocyte is a cell that has differentiated with contractility ability.
The muscles differ according to the type of muscle.
There are two types of muscles; smooth muscles and skeletal muscles.
The features of skeletal muscle cells include:
they are long, cylindrical, multi-nucleated, and striatedThe features of smooth muscle cells include:
they contain thick and thin filaments and are non-striated.Muscles cells contain many mitochondria and myofibrils.
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Look at the force diagram. What is the acceleration of the object?
The acceleration of the object, given that it has a mass of 12 Kg is 12 m/s²
How do I determine the acceleration of the object?We'll begin by obtaining the net force acting on the object. This can be obtain as shown below:
Force to the right = 175 NForce to the left = 31 NNet force = ?Net force = Force to the right - Force to the left
Net force = 175 - 31
Net force = 144 N
Finally, we shall determine the acceleration of the object. Details below:
Mass of object (m) = 12 KgNet force = 144 NAcceleration (a) =? 4Net force = mass × acceleration
144 = 12 × acceleration
Divide both sides by 12
Acceleration = 144 / 12
Acceleration = 12 m/s²
Thus, we can conclude that the acceleration is 12 m/s²
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Approximately, ___ municipal solid waste landfills in the United States combust landfill gas to generate heat and electricity
400
Approximately, 400 tons of municipal solid waste landfills in the United States combust landfill gas to generate heat and electricity
What is municipal waste?We know that municipal waste has to do with the waste products that can be obtained from the activities that go on in the city. the magnitude of the municipal waste that is generated in a place would have a lot to do with the population of the area as well as the industrial saturation of the area.
This is the reason why the areas that have less population and the industries that are there are not so much do not expirience a lot of pollution and do not have a large amount of waste water that goes out as sewage.
The solid wastes that are generated in the United States is just as large as the sewage that is generated in the united states and calls for a very urgent attention.
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in 1.8 hours a sailboat sailed 81 kilometers east across the sea at a constant velocity. what was the sailboats velocity?
The velocity of the sailboats at sailed a distance of 81 km is 12.5 m/s.
What is velocity?
Velocity is the rate of change of displacement.
To calculate the velocity of the sailboats, we use the formula below.
Formula:
v = d/t................. Equation 1Where:
v = Velocity of the sailboatsd = Distancet = TimeFrom the question,
Given:
d = 81 km = 81000 mt = 1.8 hours = 1.8×60×60 = 6480 sSubstitute these values into equation 1
v = 81000/6480v = 12.5 m/sHence, the velocity is 12.5 m/s.
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billy lifts a 2.0 kg bucket straight up with a force of 30.0 n. what is the acceleration of the bucket? (draw a free body diagram)
The acceleration when Billy lifts a 2.0 kg bucket straight up with a force of 30.0 N is 15 m/s² and free body diagram is attached in the figure..
The force due to gravity will be balanced by the force with which Billy lifts the bucket. Thus, equating the two force -
F (due to gravity) = ma (due to lifting), where m is mass and a is acceleration due to gravity.
30 = 2 × a
a = 30/2
Performing division
a = 15 m/s².
Thus, the acceleration of the bucket is 15 m/s². The free body diagram is attached in the figure. In the diagram, the blue colour ball can be assumed as bucket.
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(a) Find the amplitude, frequency, and period of motion for an object vibrating at the end of a horizontal spring if the equation for its position as a function of time is the following. x = (0.225 m) cos ???? 8.00 t A = m f = Hz T = s (b) Find the maximum magnitude of the velocity and acceleration. vmax = m/s amax = m/s2 (c) What are the position, velocity, and acceleration of the object after 1.45 s has elapsed? x = m v = m/s a = m/s2
When a function p(x) determines location, the velocity and acceleration are its first and second derivatives, respectively.
The equation a = v/t denotes acceleration (a), which is the change in velocity (v) over the change in time (t). This enables you to calculate the change in velocity in meters per second squared (m/s2). Since acceleration is a vector quantity, both its magnitude and its direction are included. The speed and direction of an object's motion are its velocity. Alternatively put, velocity is the pace at which an object's position changes (where position incorporates direction by specifying whether the object is moving backwards or forwards on a line, or moving sideways or up and down in two or three dimensions).
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The bullet strikes a block of wood which exerts, on average, a force of 50,000 N opposing the motion of the bullet. How far does the bullet penetrate?
The distance that the bullet penetrates is 0.03m.
How to solve?Given data:
The mass of the bullet is
m = 25 g = 0.025 kg
The bullet's initial velocity is
u = 350 m/s
The final velocity of the bullet is
v = 0
The average force opposing the motion is
F = 50000N
From Newton's second law, the acceleration derived as,
F = m. a.
a = F. m..........(1)
Substituting values in equation (1), we get:
a = 50000 N / 0.025 kg = 2×106 m/s 2
The equation of motion is,
v 2=u 2−2 a S
2 a S=u 2−v 2
S = u 2−v 2/2 a.......(2)
Substituting values in equation (2), we get:
S = (350 m/s)2−0/2(2×106 m/s 2)
=12.25×104 m/s 4×106 m/s 2=0.03m
here, the distance that bullet penetrates is 0.03m.
What is the kinetic energy equation?Kinetic energy has the following formula: K.E. = 1/2 m v 2, where m is the object's mass and v is its square velocity. The kinetic energy is measured in kg/m per second squared if the mass is measured in kg and the velocity is measured in meters per second.
Which 4 forms of kinetic energy are there?Radiant, thermal, electrical, and mechanical kinetic energies are the basic categories.
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The principle of connectedness would most likely lead you to perceive all the ________ as parts of a single unit.
A) words in a sentence
B) clouds in the sky
C) rungs in a ladder
The principle of connectedness would most likely lead you to perceive all the (c) rugs in a ladder as part of a single unit.
The law of unified connectedness states that elements that are connected to each other using colours, lines, frames, or other shapes are perceived as a single unit when compared with other elements that are not linked in the same manner.
In quantum mechanics, there's a phenomenon called entanglement. Entanglement really does connect things in different places for a very specific definition of “connect”. And there’s a real (but complicated) sense in which these connections end up connecting everything.
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A 0.3 kg ball attached to a rope of length 2 m is swung in a vertical plane. If the Tension at the top is 2.6 N find the speed of the ball.
Answer: 6.08 m/s
Explanation:
w=mg---> (9.8)(0.3)=2.94
Fc=mv^2/r ---> Fc=r(FT+w)/m
V=sqrt(r(FT+w)/m)
sqrt(2(2.6+2.94)/0.3= 6.08 m/s
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FILL IN THE BLANK. the density of a gold nugget is 19.3 g/cm3. if the volume of the gold nugget is 0.00369 l, the mass of the nugget is___g.
A gold nugget has a density of 19.3 g/cm3. The mass of the gold nugget is 71.22 g if the nugget has a volume of 0.00369 l.
How does density work?Mass per unit volume of a material substance; density. Density is defined as d = M/V, where M stands for mass, and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.
Density = 19.3g/cm³
Volume = 0.00369l
mass = ?
Formula
Density = mass/ volume
mass = density x volume
Convert volume from liters to cubic centimeters
1 l -------- 1000 cm³
0.00369l --------- x
x = (0.00369 x 1000 )/1
x = 3.69 cm³
Substitution
mass = 19.3 x 3.69
mass = 71.22 g.
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Scientists are now targeting Europa, one of Jupiter's moon, as a likely site for searching elementary life-forms because
Jupiter's moon Europa is regarded as one of the solar system's most promising locations to look for indications of modern life.
The geophysical characteristics of Europa, particularly the potential existence of an ocean of subglacial water, raise the prospect that human life could exist on or below the surface. The solar system's frozen moon Europa of Jupiter may provide the greatest promise for discovering modern settings conducive to life outside of Earth. Scientists have made progress in their quest to determine whether extraterrestrial life actually does exist. The best contender for alien habitability in our solar system is Jupiter's moon Europa. The hypothesis that life could exist in the inner ocean of Jupiter's moon Europa is supported by a new model created by NASA scientists.
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In the figure; two point sources S1 and S2, Which are in phase and emit identical sound waves of wavelength 2.0 m: The length L1 = 21 m. A listener stands at point P: Assume the amplitude of individual sound reaching at point P does not change, the sound that the listener hears willl be least intense if the L2 is
The length L₂ for destructive interference is L₂ = 22 m
What is a sound wave?A sound wave is a mechanical wave which carries sound energy from one point to another.
How to find the point L2?Since two point sources S₁ and S₂, Which are in phase and emit identical sound waves of wavelength 2.0 m: The length L₁ = 21 m. A listener stands at point P: Assume the amplitude of individual sound reaching at point P does not change, to find L₂, we need to know the path difference for destructive interference.
What is path difference for destructive interference?The path difference for destructive interference is given by ΔL = (n + 1)λ/2
where
ΔL = path difference = L₂ - L₁, λ = wavelength and n is an integer.Since we require the least intensity, we have the minimum interference. So, n = 0.
So, ΔL = (n + 1)λ/2
ΔL = (0 + 1)λ/2
L₂ - L₁ = λ/2
So, making L₂ subject of the formula, we have
L₂ = L₁ + λ/2
Given that
L₁ = 21 mλ = 2.0 mSubstituting the values of the variables into the equation, we have that
L₂ = L₁ + λ/2
L₂ = 21 m + 2.0 m/2
L₂ = 21 m + 1 m
L₂ = 22 m
So, the length L₂ = 22 m
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The elevator descends with an acceleration of 0.9 m/s². Find how much a 95 kg person weighs in it at the moment of descent.
one of the strongest emission lines observed from distant galaxies comes from hydrogen and has a wavelength of 122 nm (in the ultraviolet region).
(a) The galaxy moves with a velocity of 0.8 c away from us.
(b) When the galaxy moves towards us we observed that the wavelength of the line is 40.67 nm.
We know that,
The relativistic Doppler effect when the galaxy is moving away from us
In this case, when the source moves away from the observer its frequency ([tex]f[/tex]) is lower than the emitted frequency ([tex]f_{0}[/tex]) and the preceding wavelength ([tex]\lambda[/tex]) is higher than the emitted wavelength ([tex]\lambda_{0}[/tex]).
[tex]f=f_{0} \sqrt{\frac{1-\frac{u}{c} }{1+\frac{u}{c} } }[/tex]
[tex](\frac{\lambda_{0} }{\lambda})^{2} = \sqrt{\frac{c-u}{c+u} }[/tex]
Given that
[tex]\lambda_{0} =122 nm\lambda=366nm[/tex]
So
[tex](\frac{122}{366} )^{2} =\frac{c-u}{c+u} \frac{1}{9} = 8cu=0.8c[/tex]
Where c is the velocity of light it is equal to [tex]3*10^{8} m/s[/tex].
So when the galaxy moves towards us we observed that the wavelength of the line is 40.67nm.
(b) When the galaxy moves towards us its wavelength is shorter than the emitted wavelength.
The expression of the wavelength in this case is given by
[tex]\frac{\lambda _{0} }{\lambda } =\sqrt{\frac{c-u}{c+u} }[/tex]
= 40.67 nm
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Explain how magnetic stripes on the ocean floor are evidence for sea-floor spreading
Answer:
When the Earth's magnetic field reverses, a new stripe, with the new polarity, begins. Such magnetic patterns led to recognition of the occurrence of sea-floor spreading, and they remain some of the strongest evidence for the theory of plate tectonics.
Explanation:
