a wooden log that weighs 1.00 kg is placed in a fireplace. once lit, it is allowed to burn until there are only traces of ash, weighing 0.04 kg, left. which best describes the flow of energy?
The potential energy of the wooden log was converted into the kinetic energy of heat and light.
Potential energy is energy that is saved or conserved in an object or substance. This saved energy is based totally on the location, association or country of the object or substance. You could consider it as energy that has the potential to do work.
An item can store energy as the result of its function. for instance, the heavy ball of a demolition machine is storing power when it is held at an accelerated function. This saved electricity of role is known as capability electricity. similarly, a drawn bow is able to keep energy as the end result of its role.
Potential energy refers to the saved electricity within an item that exists due to the item's function, kingdom, or association. It's one of the number one types of energy the opposite is kinetic energy. The saved electricity is released when the position, kingdom, or association of the object changes.
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Which of the following is an example of a non-contact force? CHOOSE ALL THAT APPLY.
A duck floating on water
The moon orbiting the earth
Your Chromebook sitting on the desk
Pushing a child in a swing at the playground
Gravity pulls skydiver down towards the surface of the earth from an airplane
The moon orbiting the earth and Gravity pulls skydiver down towards the surface of the earth from an airplane are examples of a non-contact force
Non-contact forces are forces that act between two objects that are not physically touching each other.
That means that there is no contact but there exist force between them .The moon orbiting the earth due to gravitational force between both the bodies , this is a non contact force . Because moon is in not in contact with the earth , still both the bodies are exerting force on each other
Also Gravity pulls skydiver down towards the surface of the earth from an airplane is also an example of non contact force because there is no contact between skydiver and earth , still due to earth's gravitational force , it is been attracted towards the ground
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a star with 4 times the sun's mass is about 100 times more luminous than the sun. its main sequence lifetime is
When it is given that that star has 4 times the sun's mass then main sequence lifetime is calculated as: 312.5 * 10 ^6 million years.
What is main sequence lifetime?A continuous and distinctive band of stars that appear on plots of stellar color versus brightness known as the main sequence. The color-magnitude plots are known as Hertzsprung–Russell diagrams.
The outer layers of star expand while the core is shrinking. As the expansion continues, the luminosity also increase.
Given mass of star is 4 times the sun, then
Main sequence lifetime is calculated as:
= 10^10 / 4^2.5
= 312500000
= 312.5 * 10 ^6 million years.
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d) find the power cunsumption in 22 ohms lamp and 4.5 ohms lamp ?
e) find the power delivered by the battery
Answer:
Explanation:
R₁ = 22 Ω
R₂ = 4.5 Ω
U = 45 V
Circuit resistance:
R = R₁ + R₂ = 22 + 4.5 = 26.5 Ω
Circuit current:
I = I₁ = I₂ = U / R = 45 / 26.5 ≈ 1.7 А
Lamp voltages:
U₁ = I₁·R₁ = 1.7·22 ≈ 37 V
U₂ = I₂·R₂ = 1.7·4.5 ≈ 8 V
Power:
P₁ = U₁·I₁ = 37·1.7 ≈ 63 W
P₂ = U₂·I₂ = 8·1.7 ≈ 14 W
P = U·I = 45·1.7 ≈ 77 W
an automobile traveling at 60.5 km/h has tires of 52.2 cm diameter. what is the angular speed of the tires about their axles?
The angular speed of the tires with 52.2 cm diameter about their axles if the automobile is traveling at 60.5 km/h is 64.65 rad / s
v = r ω
v = Linear / Tangential velocity
r = Radius
ω = Angular velocity
v = 60.5 km / h = 16.81 m / s
r = 52.2 / 2 cm = 26.1 cm
r = 0.26 m
ω = v / r
ω = 16.81 / 0.26
ω = 64.65 rad / s
Therefore, the angular speed of the tires about their axles is 64.65 rad / s
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When a certain rubber band is stretched a distance x, it exerts a restoring force of magnitude f = ax, where a is a constant. The work done by a person in stretching this rubber band from x = 0 to x = l, beginning and ending at rest, is:.
When starting and ending at rest and stretching this cuff from x = 0 to x = l, the work involved is:. al²÷2
What exactly does science work on?A force's output is defined as the product of the force's component acting in the displacement's direction and its magnitude. Formula. The following formula can be used to determine work: multiply force by distance traveled in the direction of force. W = F × d.
What constitutes a work example?In our daily lives, we see many examples of work is being done. Several examples include a student carrying a bag full of books off his shoulder or back, a horse dragging a plow through a field, a father moving a supermarket cart at a mall, and many more.
Stretching the rubber band from x = 0 to x = L requires work.
[tex]W = \int\limits^L_0 {F} \, dx = \int\limits^L_0 {a} \, dx \\W = \frac{aL}{2}[/tex]
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the ability of torricelli's hypothesis about atmospheric pressure to suggest the design of the barometer is an illustration of:
The ability of Torricelli's hypothesis about atmospheric pressure to suggest the design of the barometer is an illustration of Fruitfulness
A barometer is a scientific instrument used to measure the air pressure in a certain environment. The atmospheric pressure measured is also known as barometric pressure. The pressure is measured in terms of atmosphere ( atm ) or bars. One bar / atm = 100 KPa
A glass tube closed at one end is submerged in a bowl filled with mercury and raised the tube but not above the mercury surface. The weight of the mercury pulled it down and left a partial vacuum at the closed end. This proved that gas has mass by creating pressure on things around it.
Therefore, the ability of Torricelli's hypothesis about atmospheric pressure to suggest the design of the barometer is an illustration of Fruitfulness
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a bobsled team emerges from a downhill track onto a horizontal straight track intended to slow the sled to a stop. the total mass of the bobsled and team is 488 kg. they emerge with speed 54 m/s. if the frictional force slows them to a stop at a constant 3.1 m/s2, how much work is done on the bobsled team while they stop?
Work is done on the bobsled team while they stop is 13,176 Nm
Work, in physics, degree of electricity switch that happens when an item is moved over a distance with the aid of an outside pressure at the least a part of that is carried out in the route of the displacement.
Calculation:-
mass = 488 Kg
speed = 54 m/s
a = 3.1 m/s²
displacement
V² = U² - 2as
0 = 54 - 2× 3.1 S
S = 54/6.2
= 8.71 m
Work done = force × displacement
= mass × acceleration × displacement
= 488 × 3.1 × 8.71
= 13,176 Nm
The work done via a pressure is the made of the displacement and the issue of the implemented force of the item within the path of displacement. while we push a block with a little force. The body moves with some acceleration, and work is executed. The paintings finished by pressure are defined to be manufactured from a thing of the pressure within the direction of the displacement and the significance of this displacement.
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A marshmallow is toasted over a fire. It turns a golden brown and caramelizes on the outside. It begins to melt on the inside. What type of change is outside of the marshmallow undergoing?.
Although air makes up more than half of a marshmallow's volume, sugar is the main ingredient. Gelatin or another ingredient that gels is beaten with a hot sugary syrup to create them.
Air bubbles are introduced into the mixture by beating it, and as the liquid mixture cools into a gel, they are trapped, giving the final product its spongy texture.Peeps explode in the microwave because of those bubbles, and toasting fork-sized marshmallows catch fire because of those bubbles. Increased heat causes the trapped air inside the marshmallow to expand and take up more space, which forces the elastic sugar mixture to stretch.To know about Air bubbles-
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suppose the wavelength of the light is 470 nm . how much farther is it from the dot on the screen in the center of fringe e to the left slit than it is from the dot to the right slit?
The dot on the screen in the center of the fringe e to the left slit than it is from the dot to the right slit is 940 nm.
The wavelength of mild is defined as. It is far denoted with the aid of the Greek letter lambda (λ). consequently, the space between both one crest or trough of one wave and the next wave is known as wavelength.
A bright fringe creates constructive interference, the wavelength is always in multiple forms.
At the center fringe, the difference is (470 nm)(0) = 0
For the first maximum, the difference is (470 nm)(1) = 470 nm
For the second maximum, the difference = (470 nm)(2) = 940 nm
Thus, for nth maxima, the difference is (470 nm)(n)
From the image uploaded, C is located on the second maximum, therefore the difference is given as (470 nm)(2) = 940 nm
Therefore, the dot on the screen in the center of the fringe is 940 nm.
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directions on file pls help
√10 N Force is the resultant Force in the given diagram.
3N towards north
1 N towards West
Resultant= √3²+√1²
Resultant= √10 Newton
Every action that attempts to maintain, modify, or change the motion of a body is referred to as a force in mechanics. In his Principia Mathematica, Isaac Newton frequently used his three laws of motion to demonstrate the concept of force (1687).
According to Newton's first law, a body will remain in either its resting or equally moving condition along a straight route in the absence of an external force. The second law states that when an external force acts on a body, the body accelerates (changing velocity) in the direction of the force.
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Why do political leaders look at the unemployment rates of other countries?
A. Because the unemployment rate is an indicator of the deflation
rates of currency
B. Because the unemployment rate can predict whether the price of
stocks will increase
C. Because the unemployment rate can determine whether the
country is in a period a of inflation
T D. Because the unemployment rate is a measure of the condition of
the economy
Competition from newly industrializing countries has also been blamed for rising unemployment in the OECD region.
What is Political and Economic Explanations for Unemployment ?This paper demonstrates that the widely accepted supply shock and real wage gap explanation of unemployment rate increases since 1973 has only limited empirical support.
The causes of unemployment are best understood by focusing on conflicts of interest in Western democracies, the distribution of power resources among major interest groups, and conflict strategies. Given economic constraints, unemployment appears to be the labor market manifestation of distributive conflict, with inflation and industrial disputes as alternatives.
Strategic action by government elites and long-term patterns in conflict resolution are major factors behind the two major transformations of Western unemployment levels – the introduction of full employment in the immediate postwar period and the return to high unemployment since 1973 – as well as variations in unemployment among the eighteen Western democracies.
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a mass is given a kick so that it slides up a ramp, (with friction). after the mass reaches its highest point, it slides back down. however, the magnitude of its acceleration is less on the descent than on the ascent. why? (assume that the angle of the ramp is large enough that when the mass momentarily stops at its highest point the force of static friction is insufficient to keep it there.)
The magnitude of the rock's acceleration a' is less on the descent than on the ascent.
Solution:
mass = m, angle of the ramp = A, friction force = f
when it is going up, net force F = mgsinA + f
acceleration a = F/m = gsinA + f/m
when it is going down, net force F' = mgsinA - f
acceleration a' = F'/m = gsinA - f/m
so a' < a
The magnitude of the rock's acceleration a' is less on the descent than on the ascent.
Push the blocks to slide up the ramp. After the block reaches the highest point, it slides down, but the magnitude of the acceleration is less on the descent than on the rise. Friction and gravity work together. Blocks decelerate rapidly. Descent Friction and gravity work in opposite directions. The block accelerates slowly. It doesn't take long to slide.
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do the temperature patterns under a) low emissions and b) high emissions differ from the medium emissions model? if so, how?
The temperature patterns under low emissions and high emissions differ from the medium emissions model by having different temperature rise.
A temperature pattern describes the temperature of a place in Earth. It is highly influenced by the strength of the sun. The strength of the sun is highly dependent upon how high it rises in the sky during the day. It is also influenced by the emissions in the area which is responsible for global warming.
As the name suggests low emission model has lower emission, high emission model has high emission and medium emission model will have medium emission. As emission increase, the temperature will also increase. So there will be different temperature patterns in all these models.
Therefore, the temperature patterns under low emissions and high emissions differ from the medium emissions model.
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The ball is motionless and has a mass of 3. 56 kilograms. What is the magnitude of the tension force on the string, rounded to the nearest whole number?.
The tension force on the string with a ball of mass 3.56 kg attached to it is 35 N.
What is tension force?Tension force is defined as the force transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
To calculate the tension force in the string, we use the formula below.
Formula:
T = mg........... Equation 1Where:
T = Tension force in the stringm = Mass attached to the stringg = Acceleration due to gravityFrom the question,
Given:
m = 3.56 kgg = 9.8 m/s²Substitute these values into equation 1
T = 3.56×9.8T = 34.88T = 35 NHence, the tension force on the string is 35 N.
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Two people carry a heavy electric motor (M) by placing it on a board 2.0 m long that weighs 200 N. one person A lifts at one end with a force of 400 N. and the other B lifts the opposite end with a force of 600 N. The distance from A where the centre of gravity of the motor is located is
An electric motor is a device used to convert electricity into mechanical energy—opposite to an electric generator.
What is electric motor and types?We know there are generally two types of motors, AC motor, and DC motor. AC motors are flexible for speed control and demand low power during start. On the other hand, DC motors are widely used due to its initial cost of low power units is less compared to AC and can be easily installed.An electric motor is a device which converts electrical energy into mechanical energy. There are mainly two types of electric motors: A DC motor or an AC motor, depending upon their power supplies. When electric current is passed into a rectangular coil, the current produces a magnetic field around that coil.They operate using principles of electromagnetism, which shows that a force is applied when an electric current is present in a magnetic field.(A) The weight of the motor should be considered as the 1000 N.
(B) It should be located like 1.2 m from the 400 N force.
Since
length of the board (R) = 2 m
force at one end (F1) = 400 N
force at other end (F2) = 600 N
Here we assume following things
let the distance of force F1 from the motor be = r
let the distance of force F2 from the motor be = r
So, r + r' = 2 m
a. here the weight should be
= 600 + 400
= 1000 N
b.
Since
F1 x r = F2 x r'
So,
here we have to recall that r + r' = 2
r' = 2 - r
now substituting r' = 2 -r into the equation
F1 x r = F2 x (2 - r)
So,
400r = 600(2-r)
400r = 1200 - 600r
400r + 600r = 1200
1000r = 1200
r = 1200/1000
r = 1.2 m
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The critical angle for a substance in air is measured at 53. 7°. If light enters this substance from air at 45. 0° with the normal, at what angle with the normal will it continue to travel?.
The light will continue to travel at 34.8° with the normal. The result is obtained by using the Snell's Law.
What is Snell's Law?The Snell's Law is a formula to describe the relationship between the angles of incidence and refraction when a light passes through two medias. It can be expressed as
ni / nr = sin θr / sin θi
Where
ni = incident indexnr = refracted indexθi = incident angleθr = refracted angleNote that the angles are measured from the normal line.
The critical angle can be expressed as
sin θc = ni / nr
If the critical angle is 53.7° and the light enters the substance from air at 45.0° with the normal, what angle with the normal will it continue to travel?
We can combine the above two formulas to find the refracted angle.
ni / nr = sin θr / sin θi
sin θc = sin θr / sin θi
sin 53.7° = sin θr / sin 45°
0.806 = sin θr / 0.707
sin θr = 0.707 × 0.806
sin θr = 0.570
θr = 34.8°
Hence, the light will continue to travel at 34.8° with the normal.
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the maximum force a grocery sack can withstand and not rip is 250 n. if 20.0 kg of groceries are llifted from the floor to the table with an acceleration of 5.0 m/s^2, will the sack hold?
No, the bag does not hold in case of the maximum force a grocery sack can withstand and not rip is 250 n. if 20.0 kg of groceries are lifted from the floor to the table with an acceleration of 5.0 m/s^2.
Define newtons second law of motion?The second law of motion of Newton describes how things behave when all external forces are not equal. The second rule states that an object's acceleration depends on both its mass and the net force acting on it. The acceleration of an item is defined by the net force acting on it and is inversely related to its mass.
Given,
Fₓ = 250
m = 20kg
[tex]a_{gravity}[/tex] = 9.81 m/s2
[tex]a_{pull}[/tex] = 5 m/s2
Fₙ = m(a+g)
Fₙ = 20 kg ( 5 m/s2 + 9.81 m/s2)
Fₙ = 20 (14.81)
Fₙ = 296.2
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What are the differences between ohmic and non-ohmic conductors?
Answer:
The difference between ohmic and non-ohmic conductor is that an Ohmic conductors have linear relationship between voltage and current, whereas the non-Ohmic conductors do not have linear relationship between voltage and current. The conductor is whether ohmic or non ohmic can be verified with Ohm's law.
Explanation:
what is the total (kinetic plus potential) energy of the international space station orbiting the earth?
The total energy of the international space station orbiting the earth is -μ/2a.
The total energy is the sum of kinetic energy and potential energy.
E = [tex]E_{k}[/tex] + [tex]E_{p}[/tex]
= v²/2 - μ/r
= -1/2 μ²/ h² (1-e²)
= -μ/2a
Here v = relative orbital velocity
r = orbital distance between the bodies
μ = G(m1 + m2) = the sum of the standard gravitational parameters of the bodies.
h = specific relative angular momentum in the sense of relative angular momentum.
e = orbital eccentricity
a = semi-major axis
Therefore we get the total energy is -μ/ 2a.
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what is the lowest frequency for standing waves on a wire that is 10.5 m long, has a mass of 90.0 g, and is stretched under a tension of 265.0 n?
The lowest frequency of the standing waves is 8.37 Hz.
The lowest frequency of standing waves on a wire depends on the length of the wire and wave velocity. The speed of the waves can be calculated by using this formula
v = √( F . L / m )
where v is the speed of the waves, F is wire tension, L is the length of the wire and m is the mass of the wire.
The harmonic frequency of waves should follow
f = (n + 1) v / 2L
where f is the harmonic frequency, n is the order number
From the question above, the given parameters are
L = 10.5 m
m = 90 g = 0.09 kg
F = 265 N
n = 0
Find the speed of waves
v = √( F . L / m )
v = √( 265 . 10.5 / 0.09 )
v = 175.83 m/s
Find the lowest frequency
f = (n + 1) v / 2L
f = (0 + 1) 175.83 / 2 . 10.5
f = 8.37 Hz
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a rocket is launched from the ground and travels in a straight path. the angle of inclination of the rocket's path is 1.35 radians. (that is, the rocket's path and the ground form an angle with a measure of 1.35 radians.) what is the slope of the rocket's path? if the rocket has traveled 68 yards horizontally since it was launched, how high is the rocket above the ground? yards at some point in time the rocket is 455 yards above the ground. how far has the rocket traveled horizontally (since it was launched) at this point in time? yards
109.539 yards far has the rocket traveled horizontally (since it was launched) at this point in time.
In arithmetic, the slope or gradient of a line is quite a number that describes each path and the steepness of the road. The slope is frequently denoted through the letter m; there is no clear answer to the question of why the letter m is used for slope, however its earliest use in English appears in O'Brien (1844)who wrote the equation of an instant line as "y = MX + b" and it could also be discovered in Todhunter (1888) who wrote it as "y = MX + c".
This generalization of the idea of the slope allows very complicated buildings to be planned and built that pass nicely past static systems which might be either horizontals or verticals but can change in time, flow in curves, and alternate depending on the rate of alternate different factors. Thereby, the simple concept of the slope will become one of the fundamental basis of the current world in phrases of each era and the built surroundings. The slope of a line within the aircraft containing the x and y axes is normally represented via the letter m and is defined because the change inside the y coordinate is divided through the corresponding exchange within the x coordinate, between distinct factors on the road.
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how much force is needed to make an 8kg object acccccelerate at a rate of 3.2m/s on a surface witha frictional force of 2.1n
The force is needed to make an 8kg object accelerate on a surface with a frictional force of 2.1n is 27.7 Newtons.
F = m x a
where
F = force exerted
m = mass of the object
a= the acceleration
m = 8 kg
a = 3.2m/s²
F = 8 x 3.2 = 25.6 N
So, net force required to overcome this friction and accelerate the object = 25.6 + 2.1 = 27.7 Newtons
The given question is incomplete. complete question is :
how much force is needed to make an 8kg object accelerate at a rate of 3.2m/s² on a surface with a frictional force of 2.1n.
The force is needed to make an 8kg object accelerate on a surface with a frictional force of 2.1n is 27.7 Newtons.
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which statement is true about simple machines? responses they increase the work done. they increase the work done. they reduce the amount of work required. they reduce the amount of work required. they make work easier. they make work easier. they require the same amount of force.
The correct option is "they makes the work easier".
Machines make work easier even if they still require the same amount of work to be done.
We humans get tired because we do not have constant source of energy for the work to be done.
Machines have a constant source of energy such as electricity.
Humans too will work at the same rate without getting tired if they are also provided with constant energy.
What is a Machine?
A machine is a physical system that use power to exert forces, control motion, and perform an action. The phrase is widely used to describe man-made systems that utilize engines or motors, in addition to naturally existing biological macromolecules like molecular machines. Humans, animals, and unnatural forces like wind and water can all propel machines.
Chemical, thermal, or electricity may also be used to propel them. The actuator input of these machines is often shaped by a set of mechanisms to create a certain set of output forces and movements. They may also have mechanical components that monitor activity and plan movement. These components are typically referred to as computers and sensors.
Therefore, the machines help in making the work easier.
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A certain solid substance that is very hard, has a high melting point, and is nonconducting unless melted is most likely to be.
Answer:
NaCl (Sodium Chloride)
Explanation:
This is the answer
? is a term used to describe an electrical product designed so that a single ground fault cannot cause a dangerous electrical shock through any exposed parts of the products that can be touched by an electrician.
Double insulated is a term used to describe an electrical product designed so that a single ground fault cannot cause a dangerous electrical shock through any exposed parts of the products that can be touched by an electrician.
The number one reason to test insulation is to ensure public and personal safety. By performing high voltage testing between the dead life and grounded conductors the possibility of life-threatening short circuits or ground faults can be eliminated.
Care should always be taken not to measure the insulation resistance when the temperature is below the dew point. This is the easiest method. Apply the test voltage briefly and record the measured insulation resistance at this point. Network connections are generally of two types: peer-to-peer and network-sharing environments.
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How much pressure (absolute) must a submarine withstand at a depth of 120. 0 m in the ocean?.
Answer:
Explanation:
Given:
ρ = 1 030 kg/m³ - Salt water density
h = 120.0 m - Submergence depth of the submarine
_____________________________
p - ?
Pressure:
p = ρ·g·h
p = 1030·9.8·120.0 ≈ 12·10⁶ Pa or p = 12 MPa
Which analogy best explains why inflation predicts that the overall geometry of the observable universe should appear to be flat?.
Because of how large Earth is, an ant's exploration of it makes it appear flat. It appears that the Big Bang theory explains how components were created in the first few minutes following the Big Bang.
What does Earth actually go by?Contrary to popular belief, Earth doesn't provide an official international name. The word "Terra" is merely a common misunderstanding of the scientific name for the planet. "Earth" is the commonly used English name for the planet, particularly in scientific contexts.
Is the Earth a star?A planet like the Earth revolves around a star called the sun. A star is typically understood to be a mass of gas that is sufficiently massive and dense to enable nuclear fusion to occur at its core.
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when a rifle is fired, which force is bigger? force on bullet, force on rifle, or would the magnitudes of these forces be the same?
What is magnitude?
Magnitude is a term used in physics to describe an object's maximal size and direction. Scalar and vector quantities both employ magnitude as a common factor. We are aware that scalar quantities are those that have just magnitude by definition. Those quantities with both magnitude and direction are considered vector quantities.Magnitude can be used in a variety of contexts. Among them are:
earthquake's magnitudeCharge density on an electronStrength of the forceSize of the displacementGravitational force strengthAn earthquake's size is measured in terms of its length, breadth, and width. It is calculated based on the earthquake's actual size.
However, A single magnitude is thought to exist for an earthquake.
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For what wavelength of light will the first-order dark fringe (the first dark fringe next to a central maximum) be observed at this same point on the screen?.
The wavelength of light will the first-order dark fringe is 1.205 μm.
Calculation:-
We know that, for the 1st order dark fringe, we have
y(dark,0 )= ( 0 + 1/2)*λ*L/d
0.00484 m =( 0.5*λ*3 ) /0.00037376
= λ =( 0.00484*0.00037376)/(0.5*3)
= λ = 1205*10^-9 m
= 1.205 μm
The wavelength of light determines its color and the wavelength of sound determines its pitch. Wavelength is the gap among two wave crests and the equal for wave troughs. Frequency is the variety of oscillations that bypass through a specific point in a single 2d, measured in cycles according to 2nd. the distance among peaks is called the wavelength.
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