The efficiency of the machine is ξ= 50%.
Given - 20 joules and 30 joules are input and output work of the system respectively.
To find the efficiency of the system.
principle ;- Efficiency represents the capability of a system to do work .
Mathematically , efficiency has an equation that relates the input and output work and accurately provides the result.
Formula - ξ= οₙ/Iₙ x 100
οₙ = output work , Iₙ= input work
Calculations :- ξ= { 10/20 }x 100
ξ= 50%
Result- The Efficiency of the machine is 50%.
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blood is flowing through an artery of radius 2.0 mm at a rate of 33.0 cm/s. determine the flow rate and the volume that passes through the artery in a period of 20 s.
The flow rate and the volume that passes through the artery in a period of 20 s is Q= 4.1448cm³/s and V= 82.896cm³.
How is a flow rate calculated?We must define both the volume V and the instant in time it is flowing past represented by t in order to determine the Flow Rate denoted by Q, which is equal to V/t. In addition, the relationship between flow rate and velocity can be seen in the equation Q = Av, where A is the flow's cross-sectional area and v is its average velocity.
We must utilize the equation Q=V x A, where Q is the flow rate, V is the velocity, and A is the area, to determine the flow rate.
We must apply this formula to determine the volume. V = Q x t, where Q is the flow rate, t is the time, and V is the volume.
Converting 2mm to cm is the first thing we must accomplish.
2mm x 0.1= 0.2 cm
Currently, we utilize the calculation Q=V x A, but we must keep in mind that the area of an artery is circular, therefore we swap out A with the formula π r2.
Q= 33 cm/s x 3,14x (0.2cm)²
Q= 33cm/s x 0.1256cm²/s
Q= 4.1448cm³/s.
There is a flow at 4.1448cm³/s.
Now, using the flow rate (Q), we may
V= 4.1448 cm³/s x 20s
V= 82.896cm³.
82.896cm3 of fluid travels through the artery every 20 seconds.
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A science class is observing how heat flows from one
object to another by melting ice and boiling water.
Which statements correctly describe how heat flows?
Choose the two statements that apply.
The coolness of the ice is flowing into the warm
water and decreasing its temperature.
The coolness of the water is flowing to the burner
and cooling it.
The warmth from the water is flowing to the ice
and melting it.
The warmth from the burner is flowing to the cold
water and increasing its temperature.
The warmth from the water is flowing to the ice and melting it and The warmth from the burner is flowing to the cold water and increasing its temperature.
What is the flow of heat called?Convection, which is essentially the mass transfer of heat, is the process by which heat is moved from one place to another by the movement of fluids. The transport of heat into the atmosphere involves one of three processes: radiation, conduction, or convection.
What happens during heat flow?Heat flow occurs when a hot object transmits its heat through a conductors to a cooler, similar to how high-energy objects impart their power to low-energy objects. How well a conductor transfers heat will impact how quickly and how much heat is transported.
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An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could?.
Simple harmonic motion is performed by an object attached to an ideal spring. You could double the force constant to double the total energy.
What is meant by simple harmonic motion?Simple harmonic motion is a type of periodic motion in mechanics and physics in which the restoring force on the moving object is directly proportional to the magnitude of the displacement and act in the direction of the object's equilibrium position.
The unit mass to the spring executes a simple harmonic motion in this exercise, and the maximum mechanical energy is
Em = ½ k A²
Where A represents the range of motion
We must increase the amplitude or the spring constant to double the energy.
To double the total energy, we must either increase the amplitude by a factor of 2 or increase the spring constant by a factor of 2.
The correct answer is to multiply the force constant by two.
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Heyyyy...Please i need helppp
anticlockwise = clockwise (Force*distance)
1 * 20 = 2 * x
x = 10
According to the vespr model, the best arrangement of a given number of electron domains is _______.
The best model according to vespr model has the best arrangement of a given number of electron domains and is the one with less repulsion among the electrons
The VESPR model is also known as VSEPR theory or valence shell electron pair repulsion theory. This model provides a three-dimensional structure for the arrangement of electrons within an atom. According to this model, valence shell electrons participate in chemical bonding processes. Molecular geometry shows that only valence shell electrons participate in ionic or molecular bonding.
The theory is based on the premise that repulsion between the pairs of valence electrons in all atoms and the atoms will always tend to arrange themselves in a manner in which this electron pair repulsion is minimized
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two copper wires (in different circuits) carry the same current, but wire a has twice the radius of wire b. if the drift speed of the conducting electrons in wire a is 0.1 mm/s, what is the drift speed of the conduction electrons in wire b? assume the number density of conducting electrons is the same in both wires.
4 is the drift speed of the conduction electrons in wire b.
I = neA [tex]V_{d}[/tex]
[tex]V_{d}[/tex] = [tex]\frac{I}{neA}[/tex]
= [tex]\frac{I}{ne\pi r^{2} }[/tex]
[tex]V_{d}[/tex] [tex]\alpha[/tex] [tex]\frac{1}{r^{2} }[/tex]
r' = 2r
A' = [tex]\pi 2r^{2}[/tex]
= 4[tex]\pi r^{2}[/tex]
[tex]\frac{Vd'}{Vd}[/tex]= [tex]\frac{r^{2} }{2r^{2} }[/tex] = 1/4
[tex]V_{d}[/tex] = 4
What is drift speed?Subatomic particles like electrons move in random directions all the time. When electrons are exposed to an electric field, they move randomly but slowly drift in one direction, the direction of the applied electric field. The net speed at which these electrons drift is called the drift speed. Curvature can be defined as follows:
The average speed of charged particles (eg electrons) in a material under the influence of an electric field. the SI unit of yard speed is m/s. It is also measured in [tex]m^2[/tex]/(V.s).
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a long solenoid that has 950 turns uniformly distributed over a length of 0.390 m produces a magnetic field of magnitude 1.00 10-4 t at its center. what current is required in the windings for that to occur? ma
current is required in the windings for that to occur is 32.67mA
N=950
L=0.390m
B=1.0×10⁻⁴
B=μ₀ni
n=N/L(number of turns per unit length)
i=current
μ₀=permeability of free space =4π×10⁻⁷mkgs⁻²A⁻²or4π×10⁻⁷Tesla-m/A
i=B/μ₀n
i=1.0×10⁻⁴×0.390/4π×10⁻⁷×950
i=32.67mA
Electric current is a flow of charged particles—such as electrons or ions—that moves through a conductor for electricity or into void space. It is measured by the net rate of electric charge passing through a surface or into a control volume. Moving particles, or charge carriers, can be any number of distinct kinds of particles depending on the conductor. The charge carriers in electrical circuits are frequently electrons moving down a wire. In semiconductors, they could be electrons or holes. Ions are the charge carriers in an electrolyte, and plasma, an ionized gas, is composed of both electrons and ions.
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what is the improvement in the frequency response of the modified equalizer and what benefits does that bring to the system?
An equalizer is used to adjust or correct the audio signal by boosting or lowering sound frequency. It will affect the sound output for the listener with an altered audio color. In other words, it is used to balance sound in the system.
Audio equalization itself is a process of balancing (boosting or lowering) the sound frequency to make better audio output. For example, tweaking the treble frequency will make the vocal audible, boosting the bass will make the sound heavier, and so many more to tune the sound to your audio taste. In addition, an equalizer can also be used as noise reduction.
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What is the primary advantage of using phase comparison in an interference microscope?.
The ability to view living cells in their normal form without first killing, fixing, and staining them is one of the primary advantages of phase contrast microscopy in an interference microscope.
It is possible to view and record the dynamics of current biological processes in great clarity and strong contrast with minuscule specimen detail. Phase contrast and differential interference contrast (DIC) microscopy are complementary methods for obtaining highly contrasted pictures of transparent biological phases that often have no impact on the amplitude of visible light waves flowing through the material.
In both situations, the contrast in the DIC pictures is heavily influenced by the orientation of the specimen, but the characteristics of the phase contrast images are unaffected by the rotation of the specimen around the microscope's optical axis.
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when spiking a volleyball, a player changes the velocity of the ball from 4.2 m/s to the right to 24 m/s to the left along a certain direction. if the impulse delivered to the ball by the player is 9.3 kg m/s to the left, what is the mass of the ball?
Mass of the given volleyball was 0.32 kg.
What is delivered impulse?Impulse is a measure of instantaneous change. The total momentum of an object is determined from the total change in object mass and object velocity.
Since momentum is equal to the delivered impulse,
J = m (v- u)
Where,
J = impulse delivered (-9.3kg m/s)
u = Initial speed of the ball (4.2 m/s)
v = Final speed of the ball (-24 m/s)
m = mass of the object
-9.3 = m (-24 - 4.2)
-9.3 = m × -28.2
m = 9.3 ÷ 28.2
m = 0.32 kg
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Subduction zones are associated with
Group of answer choices below
A. divergent boundaries.
B. transform boundaries.
C. convergent boundaries.
D. none of these
Subduction zones are associated with convergent boundaries.
option C is the correct answer.
What is subduction zone?
Subduction zones are plate tectonic boundaries where two plates converge or meet together, and one plate is pushed below the other plate due to underlying forces.
The following are characteristics of subduction zones;
In a subduction zone, at least one of the converging plates must be cold and dense. The more dense plate is usually the older oceanic plate.One plate must bend and move beneath the other plate. That is one plate must be on top while the other plate must be below.Convection currents, or cycling, in the mantle, must be moving downwards, pulling on the denser plate.Subduction zones is usually associated with some geo-hazards, such as;
earthquakes and volcanoesThus, we can conclude that the main feature or characteristics of subduction zones is convergent boundaries resulting from the convergent plates.
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two sounds waves are traveling through an opera house. one wave was produced by a soprano, while a baritone produced the other. which sound wave travels faster?
The speed of each wave is identical. The only factor that affects how fast sound travels is the property of the medium.
What is sound wave?An example of an energy type that propagates through a medium using adiabatic loading and unloading is acoustic waves. Acoustic pressure, particle velocity, particle displacement, and acoustic intensity are crucial parameters for defining acoustic waves. Because the air molecules oscillate back and forth as the sound travels, we refer to sound as a wave. The way the air behaves is similar to a compression or longitudinal wave on a spring.
A sound wave is a pressure wave, which can be conceptualized as variations in pressure over time. Transverse waves include sound waves. The tines of a tuning fork must transfer air from the fork to one's ear in order for one to hear the sound of the fork.
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at what point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other?
The wire must be cut at a length of l/5 along its length so that the resistance of one piece is four times the resistance of other.
The relation between the resistance the resistivity the area and the length of the wire is given by,
R = pl/A
p is resistivity,
A is the area,
l is the length of the wire.
Let us say that the peace of length X is cut from the wire,
So, length of one piece is x and of the other is (l-x)
The resistance of the bigger price has to be four times of the other.
So, we can write,
px/A = 4p(l-x)/A
x = 4l-4x
5x = l
x = l/5.
So, the wire should be cut at a point l/5 from one of the ends of the wire.
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All si units in chapter gravitation, motion, force and laws of motion
..may ik which syllabus u take
the speed of the incoming water is 30 cm/s and the cross-sectional area of the hose carrying the water is 3.0 cm2. 1) determine the time required for a 25-l container to be filled with water. (express your answer to two significant figures.)
The time required for a 25-L container to be filled with water is 277.7 min.
what is time?
Time is something that everyone is familiar with, but it is difficult to explain and comprehend. Time is defined differently in science, philosophy, religion, and the arts, but its measurement method is rather constant.
The time is measured in seconds, minutes, and hours. While the origins of these units have altered over time, they may be traced back to ancient Sumeria. The cesium atom's electrical transition defines the contemporary international unit of time, the second.
Given:
Incoming water speed (v) = 30cm/s
Hose area (A) = 2 cm²
volume of the container, V = 25 L = 25,000 cm³
The volumetric flow rate of the water is calculated as follows;
q=av
V/t=Av
T=V/Av
=25000/3x30
=25000/90
=277.7s
therefore the time required was 277.7 seconds
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according to the color code, the number of pairs of conductors in a cable that can be defined without repeating a color combination is?
According to the color code, the number of pairs of conductors in a cable that can be defined without repeating a color combination is 25 pairs
To identify individual conductors in a telecommunications twisted pair cable the 25-pair color code is used. These colours are marked on the conductor's insulation. The primary colours are white, red, black, yellow and violet. The secondary colours are blue, orange, green, brown and slate.
The primary colours are called as tip which is positive and the secondary colours are called as ring which is negative. In the pair only one colour from each group should be used. So the possible combinations are 25 pairs.
Therefore, according to the color code, the number of pairs of conductors in a cable that can be defined without repeating a color combination is 25 pairs
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According to the first law of thermodynamics, work done by a system will cause _________ in the internal energy, assuming that no heat is transferred to or from the system.
According to first law of thermodynamics, work done by system will cause a decrease in internal energy, assuming that there is no heat is transfer to or from the system.
What is the first law of thermodynamics ?The first law of thermodynamics explains that energy can neither be created nor destroyed, only be changed from one form to another.
The law states that the energy entering the system in the form of heat is equal to the sum of the increase in the internal energy of system and the energy leaving the system is in the form of work done by the system on surroundings.
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how many elements are pictured a.7 b4 c.3 d2
The number of elements pictured in the above image is 3 (option C).
What are elements?Element are any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
There are about 118 chemical elements, each with its own type of atom. Everything in the universe contains the atoms of at least one or more elements. The periodic table lists all the known elements, grouping together those with similar properties.
According to this question, elements are represented by different colours. Each colour represents each element.
The three colours are as follows:
Red Blue BlackThis means that there are three elements in the above image.
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a 1362 kg ore cart is rolling at 7.80 m/s across a flat surface. a crane dumps 367 kg of ore (vertically) into the cart. how fast does the cart move after being loaded with ore? assume that frictional forces may be neglected.
6.1m/s is correct answer.
What is frictional force?
Frictional force is defined as the force that opposes motion when one body's surface comes into contact with the surface of another. Friction force reduces a machine's mechanical advantage, or the ratio of output to input. An automobile uses about one-quarter of its energy to restrict friction force, but friction in the tyres keeps the car on the road, and friction in the clutch allows us to drive.
Friction is one of the most prevalent phenomena in the physical universe, affecting everything from matchsticks to machines to the molecular structures of every simple and complex object.
Frictional force is the opposing force formed when two surfaces attempt to move in the same direction or in opposite directions. A frictional force's primary function is to generate resistance to the mobility of one surface over another. The frictional force is determined by the texture of the body's surface.
According to conservation of momentum
m1u1= (m1+m2)v
m1=1362
m2=367
u1=7.8
v=?
m1u1= (m1+m2)v
1362x7.8 = 1727v
v = 6.1 m/s
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the magnitude of kf depends on the identity of the [ select ] and the magnitude of kb depends on the identity of the
magnitude of kf and the magnitude of kb depends upon the identity of solvent
what is kf and kb?Kf is the depression in freezing point produced by 1 molal solution of a nonvolatile solute while Kb is the elevation in boiling point produced by 1 molal solution of a nonvolatile solute.
Boiling point elevation is the difference in temperature between the boiling point of the pure solvent and that of the solution.
Molality is defined as the total number of moles of solute per kilograms of solvent present in the solution.
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if a block of material has a mass of 16 grams and a volume of 8 cubic centimeters, what is its density?
If a block of material has a mass of 16 grams and a volume of 8 cubic centimeters, then density is 2 grams per cubic centimeter.
Density = mass / volume
Density = 16/8 = 2 grams per cubic centimeter.
The substance's mass per unit of volume is its density (also known as specific mass or volumetric mass density). The Latin letter D can also be used to represent density, however the most common symbol is (the lower case Greek letter rho). According to mathematics, density is determined by dividing mass by volume, where denotes the density, m denotes the mass, and V denotes the volume. Although it is incorrect scientifically - this amount is more precisely known as specific weight – in some circumstances (for example, in the US oil and gas business), density is roughly described as its weight per unit volume.
Density and mass concentration have the same numerical value for a pure substance. Varied materials often have different densities, therefore purity and buoyancy may both be affected by density.
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in this problem, you will use lenz's law to explore what happens when an electromagnet is activated a short distance from a wire loop. you will need to use the right-hand rule to find the direction of the induced current. the switch on the electromagnet, initially open, is closed. what is the direction of the induced current in the wire loop (as seen from the left)?
The magnetic fuse dropped and the field's magnetic direction remained the same when the switch was reopened in this case. following which the loop's current flows in a clockwise direction.
iron filings on paper placed above a bar magnet to represent the direction of magnetic direction. Compass needles point in the direction of the surrounding magnetic field, away from the north pole of a magnetic direction towards its south pole. The movement of electrical charge carriers like electrons is known as current. Positive and negative locations both experience current flow. The ampere is the SI unit for calculating electrical current (A). The movement of electrical charge carriers like electrons is known as current. Positive and negative locations both experience current flow. The ampere (A) is the SI unit used to measure electric current.
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10. A stone falls freely from the top of a tower 250.0 m above the ground. Calculate its
velocity half-way through the fall. [g=10.0 ms 2]
Answer:
50 m/s
Explanation:
Half of its Potential Energy (mgh) will have been converted to Kinetic Energy ( 1/2 mv^2)
1/2 mgh = 1/2 mv^2
gh = v^2
10(250) = v ^2 v = 50 m/s
The velocity of the stone halfway through the fall will be approximately 50.0 m/s.
To calculate the velocity of the stone halfway through its fall, we can use the kinematic equation for free fall
v² = u² + 2as
Where:
v is the final velocity,
u is the initial velocity,
a is the acceleration due to gravity (g),
and s is the distance fallen.
Given that the stone falls freely, the initial velocity u is 0 since it starts from rest.
The distance fallen halfway through the fall can be calculated by dividing the total distance fallen by 2.
s = 250.0 m / 2 = 125.0 m
Plugging these values into equation, now we solve for v:
v² = 0² + 2 × 10.0 m/s² × 125.0 m
v² = 0 + 2500 m²/s²
Taking the square root of both sides to find v:
v ≈ √2500 m²/s²
v ≈ 50.0 m/s
Therefore, the velocity of the stone halfway through the fall is approximately 50.0 m/s.
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A weightlifter lifts a 32 kg barbell a distance of 0.1 m in 0.83 s. How much power is demonstrated by the lift?
Answer:
Explanation:
Work:
A = m·g·h = 32·9.8·0.1 = 31.36 L
Power:
N = A / t = 31.36 / 0.83 ≈ 38 W
why do massive stars collapse after they have fused silicon to make nickel, which then decays to make iron in their cores?
The sudden cessation of energy generation causes the core to collapse and the star's outer layers to collapse onto the core.
What is core collapse?
Core-collapse supernovae are spectacular explosions that occur at the end of a big star's thermonuclear evolution, giving rise to neutron stars and black holes. They are among the most intense occurrences in the universe, play an important role in the synthesis and distribution of chemical elements, drive the development of new stars, and are closely tied to an enigmatic subclass of gamma-ray bursts. As a result, astro-physicists are keen to learn which stars burst as supernovae, what physical mechanisms produce the explosion, and what observable effects result from these cataclysmic events.
When the explosion wave generated in the optically obscured stellar centre eventually reaches the surface layers of the star, the visual supernova outburst begins.
The fire ceases because iron does not work as a fuel. The sudden cessation of energy output leads the core to collapse and the star's outer layers to collapse onto the core. The infalling layers compress so quickly that they 'bounce' off the iron core at near-lightspeed.
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what are two of the three scales discussed in the text that we can use to measure the power/magnitude of an earthquake?
It is accurate to say that the Mercalli, Richter, and magnitude scales are the three main scales used to measure earthquakes. These three scales were used to gauge the earthquake's seismic waves.
The Mercalli intensity scale rates the power of an earthquake. The largest shock of energy from an earthquake is measured on the Richter scale. The preferred method for calculating earthquake magnitudes is the moment magnitude scale.The moment magnitude scale, which measures magnitude (M), or size, and the Modified Mercalli scale, which measures intensity, are the two scales that are most frequently used in the United States today.Seismometer data can be used to estimate an earthquake's timing, position, and magnitude. Seismometers capture the earth's internal vibrations caused by earthquakes. Every seismometer captures the earth movement right beneath it.To know more about Richter
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What is the direction of net force at all points in the projectile's path?
The direction of net force at all points in the projectile's path is downwards towards the ground.
F = m a
F = Force
m = Mass
a = Acceleration
F ∝ a
The direction of net force is influenced by the direction of acceleration.
In a projectile motion, if the air resistance is considered negligible, there will be no acceleration in horizontal direction. Because, there will be no forces acting in horizontal direction. The only force acting on the projectile is the force of gravity. Gravity pulls the object downwards throughout its motion. So the direction of net force will be downwards at all points in the projectile's path.
Therefore, the direction of net force at all points in the projectile's path is downwards towards the ground.
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to what maximum height can water go as it goes into a 3.19-cm-diameter nozzle from a 9.00-cm-diameter fire hose while carrying a flow of 30.5 l/s? ignore drag, and assume that the nozzle points straight up.
Bernoulli's equation formula is a relation between pressure, kinetic energy, and gravitational potential energy of a fluid in a container. The formula for Bernoulli's principle is given as follows: p + 1 2 ρ v 2 + ρ g h = c o n s t a n t.
An object's kinetic energy is the energy it has as a result of motion. Applying force is necessary if we want to accelerate an object. We have to put in work to apply a force. After the work is finished, the object will be moving at a new, constant speed because energy has been transferred to it. The science of fluid mechanics examines how fluids—including liquids, gases, blood, and plasma—behave both at rest and while moving. There are numerous uses for fluid mechanics in astrophysics, chemical and mechanical engineering, and biological systems.
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a block of mass m is attached to a spring and placed on an inclined plane. the spring has a spring constant k, and there is negligible friction between the block and inclined plane.the block is released from rest at the position shown in the figure above with the spring initially unstretched. what distance d does the block slide down the plane before coming momentarily to rest?
The distance travelled by the block of mass m will be l₀ + x or d which can be calculated through implementing the Conservation of energy from Work energy theorem
For l₀ + x, (from figure)
sinᶿ = h / (l₀+x) ----- equation 1
We know from conservation of energy,
Ka + Ua = Kc + Uc
Here
Ka = kinetic energy at point A
Ua = potential energy at point A
Kc = kinetic energy at point C
Uc = potential energy at point C
Since the block is at rest Ka = 0 & block comes to rest after moving Kc = 0 as well
Therefore Ua = Uc
Ua = m.g.h
Uc = ½ kx²
m.g.h = ½ kx²
h = kx²/2mg ---- equation 2
Substitute the obtained value of h i.e. equation 2 in equation 1 for calculation of distance travelled by the block on an inclined plane.
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Answer:
d = (2mg sinθ) / k
Explanation:
We can use the conservation of energy.
At the point when the block comes to rest, all of its initial potential energy mgh is converted into the potential energy stored in the spring (1/2)kx², where x is the amount by which the spring is compressed.
Using trigonometry, we can see that the height h of the incline is equal to
d sinθ
where d is the distance traveled by the block down the incline.
We know this because d represents an incline and to find the y value of an incline we use sinθ
Therefore, we can write:
mgh = (1/2)kx²
Substituting h = d sinθ and solving for d, we get:
mgd sinθ = (1/2)kd²
d = (2mgsinθ)/k
Therefore, the correct answer for the distance that the block slides down the incline before coming momentarily to rest is (2mg sinθ)/k.
I hope this helped! :)
Efficiency, fill in the blanks
