The transformer having a primary voltage of 70 V and a secondary voltage of 210 V is a step-up transformer (1st option)
What is a transformer?This is a device tthat transfers electrical energy either by steping-up or steping-down voltage.
Generally, there are two main types of transformer:
Step-up transformerStep-down transformerIn step-up transformer, secondary voltage is higher than the primary voltage
In step-down transformer, primary voltage is higher than the secondary voltage
With there above information in mind, we can conclude that the correct anwer to the question is:
It’s a step-up transformer because the secondary voltage is greater than the primary voltage (1st option)
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Which of the following is true about electricity and magnetism?
The creation of an electric current or magnetic field depends on the movement of electrons.
Magnets can induce electric currents only when using the north pole of the magnet.
The free flow of protons down a copper wire causes an electric current that can create a magnetic field.
Attractive and repulsive forces between charged particles prevent them from creating electric currents or magnetic fields.
Answer: A
The creation of an electric current or magnetic field depends on the movement of electrons.
Explanation:
find the magnitude of the earth's velocity as it travels around the sun. assume a year of 365 days.
The magnitude of the earth's velocity as it travels around the sun is Vo = 29.87 Km/s
What is angular velocity ?In basic words, angular velocity is the time rate at which an item rotates or revolves about an axis. Angular velocity is represented by the Greek letter omega (ω, sometimes Ω). The SI unit for angular velocity is radians per second because it is expressed as an angle per unit of time.
According to the given information
Orbital velocity Vo = 2[tex]\pi[/tex]r/T
Vo = 2 × 3.14 × 1.5 × 10^11/365 ×24× 60×60
Vo = 29.87 Km/s
Angular velocity and linear velocity are related as V = r W
So
W = 29.87×10^3/1.5×10^11
W = 1.991×10^-7 rad/s
The magnitude of the earth's velocity as it travels around the sun is Vo = 29.87 Km/s
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the energy between adjacent vibrational levels in diatomic nitrogen is 0.293 ev. what is the vibration frequency f of n2? answer in units of hz.
The energy between adjacent vibrational levels in diatomic nitrogen is 0.293 ev.the vibration frequency f of n2 is 7.07 × 10 13 H z.
What is Vibrational Energy Levels diatomic molecule?Vibrational Energy Levels The vibrating of the two atoms around the molecule's centre of mass produces a single set of vibrational energy levels in a diatomic molecule.Molecule Rotation and Vibration: A molecule's vibrational motion and vibrational energy levels are dictated by its electronic energy function. The assumption that the force between the atoms of the molecule is proportional to the displacement of the internuclear distance from its equilibrium value r underlies the simplest explanation of the vibrational motion of a diatomic molecule. This explanation is based on the approximation of the energy curve in the vicinity of its minimum by a parabola.To learn more about Vibrational Energy Levels refer to:
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The law of conservation of energy states that (1 point) Group of answer choices all energy in the universe comes from the sun and remains in the same form energy is neither created nor destroyed; it is transformed and transferred new energy within a system is converted or transferred and destroyed as it is used energy is created from the sun and is transformed from one type to another
The law of conservation of energy states that energy is neither created nor destroyed; it is transformed and transferred (option B).
What is the law of conservation of energy?The law of conservation of energy is a principle stating that energy may not be created or destroyed but can only be transformed i.e. converted from one form to another.
This means that a system always has the same amount of energy, unless it's added from the outside.
The law states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Therefore, according to this question, the law of conservation of energy is described correctly by option B.
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Which of the fillowing scenarios describle a car that is accelerating?
A. a car that is gradually coming to a stop?
B. a cor going, constant 50 mph on a straight road
C. a car that is changing lanes?
D. a car that is entering a highway from on entrance ramp?
Answer:
DDDDDDDDDDDDDDDDDDDDDDDDDDD
suppose a ramp is used to move a heavy object into a van. suppose also that the van door is 18 inches off the ground. a.if the bottom of the ramp rests on the ground 4 feet from the van, what is the slope of the ramp?b.if the ramp cannot have a slope of more than 1.2 inches per foot, how far from the van should the ramp rest
Answer: 1/3 inch up per foot across 1/2 inch up per foot.
What is slope?
--Slope, slant mean to incline away from a relatively straight surface or line used as a reference.
--To slope is to incline vertically in an oblique direction: The ground slopes (upward or downward ) sharply here.
In above we need to find the the slope of the ramp
i.e Vandoor is 18 inch from the ground
So 4/12 = 1./3 inch up per foot
--Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object.
Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
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1/3 inch up per foot across 1/2 inch up per foot.
What is slope?Slope, slant mean to incline away from a relatively straight surface or line used as a reference. To slope is to incline vertically in an oblique direction: The ground slopes (upward or downward ) sharply here.
In above we need to find the the slope of the ramp
i.e., Van door is 18 inch from the ground
So 4/12 = 1./3 inch up per foot
Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object.
Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
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A Styrofoam cup holding 125 g of hot water at 1.00×102∘C cools to room temperature, 20.0 ∘. What is the change in entropy of the room? (Neglect the specific heat of the cup and any change in temperature of the room.)
The change in entropy of a system will be 6.25 kJ/K. For further explanation you can read below.
The change in entropy of a system is given by the equation ΔS = Q/T, where Q is the heat transferred and T is the temperature at which the transfer occurs. In this case, the temperature of the hot water is initially 1.00×102 ∘C and it cools to room temperature, which is 20.0 ∘C. Note that entropy is a measure of the disorder or randomness of a system, and that this calculation assumes that the heat from the hot water is completely transferred to the room, increasing its disorder. It also assumes that the specific heat of the cup and any change in temperature of the room are negligible, which is generally a good approximation for a small cup of hot water in a large room.
We can therefore calculate the change in entropy of the room as follows:
ΔS = Q/T = (125 g * 1.00×102 ∘C - 125 g * 20.0 ∘C) / (20.0 ∘C)
= 6.25 kJ/K
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The conservation of momentum is most closely related to Newton's?
The conservation of momentum is most closely related to Newton's third law.
According to the conservation of momentum, momentum is neither created nor destroyed, although it can change from one form to another.
According to Newton's third law, for every action, there is an opposite reaction, and energy is neither created nor destroyed. Rather the energy is changed from the action to the reaction in a given system and the amount of energy remains the same.
Both the conservation of momentum and Newton's third law imply that energy in a system can be converted but the value remains the same in a system and hence is closely related.
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Can someone help with this
To solve this problem, you can use the equation for the conservation of energy, which states that the initial potential energy of the spring plus the work done by friction is equal to the final kinetic energy of the block.
The initial potential energy of the spring is given by 0.5kx1^2, where k is the force constant of the spring and x1 is the initial compression of the spring.
The work done by friction is equal to the force of friction times the distance over which it acts, which is given by µkmg*x1, where µk is the coefficient of kinetic friction, m is the mass of the block, g is the acceleration due to gravity, and x1 is the distance the block moves before coming to rest.
The final kinetic energy of the block is given by 0.5mv^2, where m is the mass of the block and v is the final velocity of the block.
You can set up the equation as follows:
0.5kx1^2 + µkmgx1 = 0.5m*v^2
Substituting the given values, we have:
0.5400.3^2 + µk29.810.3 = 0.52*v^2
Solving for µk, we find that:
µk = (0.5400.3^2 - 0.52v^2)/(29.810.3)
The maximum extension x2 of the spring is equal to the distance the block travels, so we can substitute x2 for v:
µk = (0.5400.3^2 - 0.52x2^2)/(29.810.3)
Substituting the value of x2, we find that:
µk = (0.5400.3^2 - 0.520.2^2)/(29.810.3)
Simplifying, we find that:
µk = 0.2
Therefore, the answer is 0.2, letter B.
. julia is taking a 200-mile trip by car. if she drives for two hours with an average speed of 60 miles per hour, how many miles will she still need to drive to complete her t
Julia will cover 80 miles in order to complete her trip.
What is speed ?Speed is the rate at which a distance changes over a period of time.
It has a dimension of time-distance.
As a result, the meter per second (m/s) is the SI unit of speed.
According to the given information
Given that,
Total distance of trip = 200 miles
Julia travels at a 60 miles per hour average.
Since, Julia drives for 2 hours,
Then distance travelled by Julia in 2 hours at the speed of 60 miles per hour = 60 × 2 = 120 miles
Total distance = 200 miles
Distance left = 200 - 120 = 80 miles
Julia will cover 80 miles in order to complete her trip.
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how much excess charge must be placed on a copper sphere 25.0 cmcm in diameter so that the potential of its center is 3.75 kvkv ?
Excess charge must be placed on a copper sphere = 4.167 x 10^(-8) C
The potential is the same within and equal to the potential outside, as if the charge were concentrated in the center, at all places. At infinity, there is no potential.
From the question, we have
kq/r = 1.5 x 1000
q = 1500r/k
= 1500*(0.25)/9x10^9 C
= 4.167 x 10^(-8) C
Electric potential :
The amount of work required to convey a unit of electric charge from a reference point to a given place in an electric field is known as the electric potential (also known as the electric field potential, potential drop, or the electrostatic potential).
Complete question:
How much excess charge must be placed on a copper sphere 25.0 cm in diameter so that the potential of its center, relative to infinity, is 3.75 kv?
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A 0.039 kg bullet moving at 475 m/s strikes a stationary 5.7 kg wooden block. The bullet passes through the block and leaves with a velocity of 284 m/s. If the block was originally at rest, how fast does it move after being hit by the bullet?
use units and work out
The velocity of the block after it is hit by the bullet is 1.307 m/s.
What is velocity?Velocity is the rate of change of displacement.
To calculate the velocity of the block after it is hit by the bullet, we use the formula below.
Formula:
v = (mU-mV)/M............. Equation 1Where:
v = Final velocity of the blockU = Initial velocity of the bulletV = Final velocity of the bulletM = Mass of the blockFrom the question,
Given:
m = 0.039 kgM = 5.7 kgU = 475 m/sV = 284 m/sSubstitute these values into equation 1
v = [(0.039×475)-(0.039×284)]/5.7v = (18.525-11.076)/5.7v = 1.307 m/sHence, the velocity of the block is 1.307 m/s.
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two strings are adjusted to vibrate at exactly 200 hz. then the tension in one string is increased slightly. afterward, three beats per second are heard when the strings vibrate at the same time. what is the new frequency of the string that was tightened?
The new frequency of the tightened string is 201.5 Hz.
Let's assume that the strings both start out vibrating at 200 Hz.
The frequency of the tightened string must be slightly higher than 200 Hz in order to produce 3 beats per second. We can calculate the new frequency of the tightened string by using the formula:
Frequency of the tightened string = (frequency of the other string) +/- (3 beats/second ÷ 2)
so,
Frequency of tightened string = 200 Hz +/- (3 beats/second ÷ 2)
Frequency of tightened string = 200 Hz +/- 1.5 Hz
Therefore, the new frequency of the tightened string is 201.5 Hz.
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ultraviolet radiation falls in the wavelength region of to meters. what is the energy of ultraviolet radiation that has a wavelength of m? energy
the energy of ultraviolet radiation that has a wavelength is 6.95*[tex]10^{-19}[/tex] kj/photon
calculation :
1.E =hc/λ
λ = hc/E
= [tex]\frac{6.6626*10^{-34}*3*10^{8} }{1.99*10^{-19} }[/tex]
= [tex]1.0*10^{-8}m[/tex]
2 . E =hc/λ
λ = hc/E
= [tex]\frac{6.6626*10^{-34}*3*10^{8} }{3.97*10^{-19} }[/tex]
= 501 nm
3 . λ = 286 nm
E =hc/λ
= [tex]\frac{6.6626*10^{-34}*3*10^{8} }{286}[/tex]
= 6.95*[tex]10^{-19}[/tex] kj/photon
In physics, energy is the quantitative property transmitted to the body or physical system, perceived in the performance of work and in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. The unit of measure for energy in the International System of Units (SI) is the joule (J).
Common forms of energy include the kinetic energy of moving bodies, the potential energy stored in bodies (due to their position in the field, etc.), the elastic energy stored in fixed bodies, the chemical energy associated with chemical reactions, Radiant energy carried by electromagnetic radiation and internal energy contained in thermodynamic systems. All living things absorb and emit energy all the time.
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If you thrust a magnet into a closed loop of wire, the loop will
a.rotate
b.have current in it
c.both of the above
d. none of the above
If you thrust a magnet into a closed loop of wire, the loop will have current in it. So the correct option is B.
What is a magnet?A magnet is a body with a magnetism that can attract different irons that can be given naturally or artificially. Magnets can have their magnetic field continuously and this field can attract materials or repel them, this will depend on the magnetic permeability of the compound. The magnetic field of the images will be oriented towards the south pole and the north pole and each of these will be attracted by their opposites.
Not all magnets have permanent magnetism, this depends on whether they are going to be magnetized to be permanent or if they will only have temporary functionality.
By pushing a magnet in a closed circuit of wire, a magnetic field will be generated in which a current will flow in the turns of wire.
Therefore, we can confirm that the correct option is B. have current in it.
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One average force has a magnitude that is three times as large as that of
another average force . Both forces produce the same impulse of 3 N.m. The
average force acts for a time interval of 3.2 s. For what time interval does the
average force act?
The second average force act at a time interval of 1.1s(1dp)
What is impulse?Impulse of a force is defined as the product of the average force and the time interval for which the force acts on the body.
It is measured in Nm and it is a vector quantity.
impulse is given as force ×time
let F1 represent the first average force and F2 be the second average force.
the time interval for the first average force is 3.2 seconds, therefore the average time interval for the second force will be 3.2/3= 1.1s(1dp)
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With the knowledge of mathematics and with the use of formula, the time interval will be 1.07 s
What is Impulse ?Impulse can be defined as the product of force and time. Impulse is the same as change of momentum.
Given that one average force has a magnitude that is three times as large as that of another average force. That is,
F = 3f ....... (1)
If both forces produce the same impulse of 3 N.m. The average force acts for a time interval of 3.2 s. For what time interval does the other average force act?
Impulse = force × time
If both forces produce the same impulse of 3 Nm
For first average force F,
3 = F × T
F = 3/T
For second average force f
3 = f × t
f = 3/t
Substitute both F and f into equation 1
F = 3f
3/T = 3(3/t)
Given that t = 3.2 s
Then, 3/T = 9/3.2
Cross multiply
9T = 9.6
T = 9.6/9
T = 1.07 s
Therefore, the first average force will act for time interval of 1.07 s
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construct a graph corresponding to the stone's vertical velocity, vy(t).
Graph corresponding to the stone's vertical velocity, vy(t) is slant line from 1st quadrant to 4th quadrant.
Assume, For time direction 0 to 2 seconds
V = Vo - gt
At T = 2 sec; V = 0
so, 0 = Vo - 20
Vo = 20 m/s
From T = 2 sec to T = 6sec
V = 0 - gt = -10 t
hence
Velocity vs time graph is in figure.
An object's speed and direction on a vertical plane are referred to as vertical velocity. Vertical velocity can be used to describe a variety of objects, including coins dropped into wells by children and balls flung into the air. Gravity, which constantly acts on an item to change its velocity, is a crucial factor in vertical velocity. As the ball ascends, its speed will progressively slow until it eventually comes to a stop, modifies its course, and returns to earth. Anywhere along the ball's course, its velocity can be expressed as a number. The number's sign (positive or negative) indicates the ball's direction, and its value indicates the ball's speed.
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A bike accelerates uniformly from rest to a speed of 3.55 m/s over 17.7m . what is the acceleration of the bike
Answer:4.9mph per meter
Explanation:
When the velocity of a moving body decreae by equal amount in equal time,the body i aid to have??
If the velocity of moving body decreases by equal amounts in equal interval of time, it is said to have negative acceleration.
What is velocity?
The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity. The standard unit of velocity magnitude is the meter per second (m/s).
What is acceleration?
Acceleration is the rate at which an object's velocity with respect to time changes. Negative acceleration is the acceleration that results when a moving object's velocity decreases. When a body's velocity is decreasing, it typically experiences negative acceleration. Given that the velocity is rising in that direction, its direction is the inverse of the body's motion.
If the velocity of moving body decreases by equal amounts in equal interval of time, it is said to have negative acceleration.
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how strong is the electric field between two parallel plates 6.8 mm apart if the potential difference between them is 220 v?
That amounts battery to 220 volts divided by 6.8 times 10 and three less meters between them. That is 6.8 millimeters electric 3.2 times 10 to the four Newtons per Coulomb gives us 32,352 Newtons per Coulomb.
A battery is a device that converts chemical energy into electrical energy by storing it. During chemical reactions in batteries, electrons flow from one material (electrode) to another through an external circuit. The movement of electrons results in an effective electric current.
Electric field due to battery = potential/separation = 220v / 6.8mm = 220v / 0.0068m = 32,352 volts per meter, according to the question.
If there is a battery, two parallel plates spaced 6.8 mm apart will create an electric field.
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a uniform 2 meter long beam weighing 100 n is held in place by a wall with a 0.4 coefficient of static friction and a cable. a 50 n sign is hung from the beam. what is the furthest the sign can be hung from the wall if the beam is in static equilibrium? what is the tension in the cable and the normal force exerted by the wall in that case?
The tension is the cable is 3100.5 N
The tension on the string can be said as the resultant of the force pulling the string.
Tension is also the force that is in between of the other two forces from the other two ends of the string.
According to the Newton's third law there is always an equal and opposite reaction.
So if the force is applied on the string then the string will also apply a force backward. This is the tension.
Weight of beam = 5180 N
Location of of thin cable attachment = 1.5 m from free end of beam
Taking moment about the wall and noting that the weight of the beam acts at the center, we get;
6.9/2 × cos 27 × 5180 = (6.9-1.5)× cos 18 × T
Therefore, T = 15923.1776/5.136 = 3100.5 N
Therefore, the tension in the cable is 3100.5 N.
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now barry imagines he is on a boat and he decides to go for a swim, and that the captain gives barry a choice of two life preservers, one filled with styrofoam and an identically sized one filled with lead. which life preserver, when placed in the water, will kachina say has the greater buoyant force?
As long as their contents are the same, the buoyant force is stronger on the life jacket that is filled to the same level when both are totally immersed.
What does science mean by "force"?In science, "force" refers to a certain concept. An object cannot hold a force; it is impossible. A force is experienced by one item from another. In the notion of a strength, both of these would be intriguing inanimate objects.
What are force and example?The word "energy" refers to a body's innate propensity to alter or adapt its structure in response to an outside force. each time a force is used.
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jessie and jaime complete a 4.0 km race. each has a mass of 68 kg. jessie runs the race at 15 km/h; jaime walks it at 5.0 km/h. use the table below.
It is calculated that each person required 656.91 J of metabolic energy to finish the course.
How is energy formed?When electrons transfer by one atom to the next, energy is produced. Energy can also take the form of heat or light. It is also possible to convert one type of energy into another. Potential energy that has been stored converts to electric energy using a battery.
Briefing:The following formula is used to determine Jessie and Jaime's kinetic energy:
K.E = ¹/₂mv²
where;
m is mass of Jaime
v is speed
15 km/h = 4.17 m/s
4 km/h = 1.39 m/s
K.E = ¹/₂(68)(4.17)² + ¹/₂(68)(1.39)²
K.E = 656.91 J
Thus, it is calculated that each person required 656.91 J of metabolic energy to finish the course.
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The complete question is-
Jessie and Jaime complete a 4.0 km race. Each has a mass of 68 kg. Jessie runs the race at 15 km/h; Jaime walks it at 5 km/h. How much metabolic energy does each use to complete the course.
a certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 31.0 m/s. with what maximum speed can it go around a curve having a radius of 85.5 m?
Maximum speed can it go around a curve having a radius of 85.5 m is 22.6 m/s.
The maximum speed corresponding to radius r=150m is v=32.0m/s
The radius of the new track, r′=75.0m
A centripetal force must be exerted on an object for it to move in a circular path; this force is determined by the object's speed and the path's radius using the equation:
Fc=mv²/r
, where:
m is the mass of the object.
v is the speed of the object.
r is the radius of the circular path.
Let the maximum possible speed on the second track be v′.Considering that the maximal centripetal force must be equal in both situations, we have:
mv′²/r′=mv²/r
⇒v'=v√r′/r=32.0m/s×√75.0m/150m
=32.0m/s×√1/2
≈22.6m/s.
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a 2.0-kg mass is attached to the end of a horizontal spring of spring constant 50 n/m and set into simple harmonic motion with an amplitude of 0.10 m. what is the total mechanical energy of this system?
Answer:
0.25 J
Explanation:
Ravi uses two lenses A and B of same size and same material as shown. P1 and P2 are the powers of A and
B. An object is kept at the same distance from the lens between F and 2F of each lens on the principal axis
in turn. Let I1 and I2 be the image formed by two lenses respectively. What is the relation of image distances
of both lens ?
please help me fast
The relationship between image distances and object distances for a lens is given by the lens formula: 1/I = 1/f - 1/u, where I is the image distance, f is the focal length of the lens, and u is the object distance.
How to cause image formation in lenses?In the given scenario, the object is kept at the same distance from both lenses A and B, which is between F and 2F of each lens. The image distances I1 and I2 will be different for the two lenses because the focal lengths of the lenses are different, as represented by the different powers P1 and P2.
We can use the lens formula to find the relationship between the image distances of the two lenses.
For lens A: 1/I1 = 1/f1 - 1/u
For lens B: 1/I2 = 1/f2 - 1/u
Where f1 and f2 are the focal length of lenses A and B respectively.
As we know that the object distance is same for both lenses, we can subtract these two equations to get the relationship between I1 and I2.
1/I1 - 1/I2 = 1/f1 - 1/f2
This equation shows that the relationship between the image distances of the two lenses is determined by the difference between the focal lengths of the lenses. If the focal lengths of the lenses are equal, the image distances will also be equal. But if the focal lengths are different, the image distances will also be different.
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) a 4.0-kg object is attached to a spring of spring constant 10 n/m. the object is displaced by 5.0 cm from the equilibrium position and let go. what is the period of vibration?
x(t)=Acos(ωt) The amplitude of the periodic motion, x (t) = A cos |A|, is the maximum magnitude of the object's displacement. is the angular frequency of motion given by 2T 2 T, where T is the period of periodic motion, or the time required to complete one full cycle.
How to Calculate the Amplitude of Simple Harmonic Motion ?
Periodic motion is defined as an object that moves back and forth over the same path. A restoring force acts to bring the moving object back to its equilibrium position. A simple harmonic motion occurs when the restoring force is proportional to an object's displacement.
The following equation describes a simple harmonic motion.
x ( t ) = A cos ( t ) | A | is the periodic motion's amplitude, which is the maximum magnitude of the object's displacement. is the angular frequency of motion given by 2 / T, where T is the period of periodic motion, the time required to complete one full cycle.
Therefore, the total period of vibrations in harmonic motion :4 | A | gives the total distance traveled in one complete cycle as an object oscillates.
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a constant force is exerted for a short time interval on a cart that is initially at rest on an air track. this force gives the cart a certain final speed. suppose we repeat the experiment but, instead of starting from rest, the cart is already moving with constant speed in the direction of the force at the moment we begin to apply the force. after we exert the same constant force for the same short time interval, the increase in the cart’s speed
The cart's increased speed is the same as when it first took off.
What does speed in physics mean?Rate is the speed from which an object travels along a path over time, whereas velocity is the speed and orientation of an item's motion.
Briefing:We're informed that;
At first, the cart is at rest. So, u = 0 m/s.
A brief period of time is spent with a constant force applied.
The final speed that the force gives the cart is what we'll call v.
Newton's first equation of motion yields the following results:
v = u + at
Where;
The ultimate speed is v.
The starting speed is u.
Acceleration is a.
t is time.
u = 0 m/s, therefore we now have;
v = 0 + at
v = at
Let's now use Newton's second rule of motion to construct a formula to introduce force;
F = ma
Where;
Force is f.
mass is m.
Acceleration is a.
So, a = F/m.
F/m for an in and v = at to obtain;
v = (F/m)t
The final speed, v, is evidently exactly related to the force. So, if the force is constant, the end speed will also stay constant.
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The complete question is -
A constant force is exerted for a short time interval on a cart that is initially at rest on an air track. This force gives the cart a certain final speed. Suppose we repeat the experiment but, instead of starting from rest, the cart is already moving with constant speed in the direction of the force at the moment we begin to apply the force.
After we exert the same constant force for the same short time interval, the increase in the cart's speed:
A. is equal to two times its initial speed.
B. is equal to the square of its initial speed.
C. is equal to four times its initial speed.
D. is the same as when it started from rest.
E. cannot be determined from the information provided.
assume obj1 and obj2 are object references. which of the following best describes when the expression obj1 == obj2 is true?
The reference equality is tested using the == operator. True. If obj1 and obj2 refer to same object, then obj1 == obj2 is true. True. A String object cannot be changed.
What is a string, exactly?In programming, a string is a form of data that is used to data type rather than integers. Letters, numbers, symbols, and even spaces can all be found in a string, which is a collection of characters. In order for it to recognized as a string, it needs to be encapsulated in quotation marks.
Is string a datatype or an object?A string is frequently implemented as just an array data structure of bits (or words) that records a sequence of elements, usually characters, using some text encoding. Typically, a string is considered to be a data type.
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(13%) Problem 7: Consider the Lyman series for atomic transitions in hydrogen: 50% Part Calculate the wavelength the first line in the Lyman series, in nanometers 50% Part (b) What type of electromagnetic radiation is it?'
The wavelength of the first line in the Lyman series of the hydrogen spectrum is equal to 121.6 nm and it will be ultraviolet radiation.
When an electron transitions from its lowest energy state of n = 1 to n = 2 (where n is the main quantum number), the Lyman series, a hydrogen spectral series of transitions and ultraviolet emission lines are produced. The transitions are given Greek letter names, such as Lyman-alpha, which goes from n = 2 to n = 1.
Given Z = atomic number and R = Rydberg's constant (109677 cm-1)
since for the first line of the Lyman series, the electron is de-exited from the excited state (i.e., n2=2) to the ground state (i.e., n1=1).
1/∧ =R(1/n1^2- 1/n2^2)
1/∧= 109677(1/1 - 1/4)= 109677(3/4) = 121.6nm
As a result, we know that the wavelength of the first line in the Lyman series of the hydrogen spectrum is equal to 121.6 nm. As the range of ultraviolet radiation is from 100 nm to 400 nm. So it will be ultraviolet radiation.
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