The work done by the person operating the jack is 4,800 J
Efficiency is described as the potential to perform something with the least quantity of wasted time, cash, and attempt or competency in performance. Effectiveness is described because the diploma to which some thing is successful in producing a preferred result; achievement.
calculation:-
work input = (1200 J)/(0.25)
= 4800 J.
There are numerous styles of performance, consisting of allocative and effective performance, technical efficiency, 'X' efficiency, dynamic performance and social efficiency.
The prime focus of performance is for customers to get the goods and offerings they want at the bottom possible resource price. Inside the have a look at of economics, the dreams of efficiency and equity are frequently in warfare with each other.
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a satellite is orbiting a planet at distance r above its surface and has a period of t. what would the distance above the surface have to be in order for the period to become eight times greater?
The radius of the new orbit should be 4 times larger to increase the satellite period 8 times.
Calculation:-
Using the formula for the satellite period.
T = 2π [tex]\sqrt{\frac{R^{3} }{GM} }[/tex]
In which R is the average radius of orbit for the satellite G is the gravitational constant, and M is the mass of the planet.
Therefore the radius of the new orbit ought to be four instances large to increase the satellite period 8 instances.
The orbital length is without delay associated with the common distance among the planet and the sun. This regulation means that planetary orbital velocity decreases with increasing distance from the sun.
The orbital length will increase if the orbital distance is multiplied. As the distance of the planet from the solar increases, the length of revolution decreases. you could calculate the space in more than one methods. One way is to multiply the calculated rate by the length.
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20.0 l of a monatomic ideal gas at a pressure of 100 kpa expand adiabatically until the volume doubles. what is the pressure in the gas at that point?
The pressure in the gas at that point is equal to the initial pressure, 100 kPa.
To expand adiabatically, there must be no heat transfer involved. Adiabatic expansion means that no heat is transferred between the gas and its surroundings; this means that if we double the volume of our gas, nothing should change in terms of temperature as long as there is no heat transfer to or from our system during expansion.
Since we're starting out with a monatomic ideal gas, we know that its entropy is going to stay constant throughout this process, so the ideal gas law gives us a relationship between pressure, volume, and temperature: PV = nRT
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discuss the statistical nature of the clausius statement of the second law that energy cannot go spontaneously from a colder to a hotter body. under what conditions is the statement applicable? in what sense is this statement incorrect?
It is true that clausius statement of the second law states that energy cannot go spontaneously from a colder to a hotter body.
What is second law of thermodynamics and what is clausius statement of the second law of thermodynamics?Second law of thermodynamics is the law stating that heat and energy are interconvertible and is transferred from one form to another.Clausius statement of the second law of thermodynamics states the same but it also states that energy and heat cannot be transferred from colder to hotter body.It simply justifies that heat cannot be transferred from hot reservoir to cold reservoir at any cost.The condition under which the clausius statement is true is that the entropy change should be greater or equal to zero.Hence if entropy change is zero or greater than zero then clausius statement is truly justified.To know more about thermodynamics visit:
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Consider a relation representing the present position of molecules in a closed container. The attributes are an id for the molecule, the x, y, and z coordinates of the molecule, and its velocity in the x, y, and z dimensions. What fd’s would you expect to hold? what are the keys?.
The following are some examples of the functional dependencies that can be held:
PX, PY, and PZ →VX
PX, PY, and PZ →VY
PX, PY, and PZ →VZ
Define functional dependence.Functional dependency is a term that describes a constraint that is usually used to explain the link between two (2) different sets of attributes, where one set may predict the true value of the other attributes accurately and uniquely.
The coordinates of the molecule in this example would be PX, PY, and PZ, while the velocities of those coordinates would be VX, VY, and VZ. Functional dependencies can so be illustrated by the following examples:
PX, PY, and PZ → VX
PX, PY, and PZ → VY
PX, PY, and PZ → VZ
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why the heliocentric theory of the solar system came to be regarded as preferable to the geocentric theory
Copernicus adopted the heliocentric view because it better explained the movements of the heavens mathematically.
Copernicus' heliocentrism could eliminate Ptolemy's epicycles because retrograde motion could be seen as the result of a combination of Earth and planetary motions and velocities.
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how is cmb observed from earth
The Cosmic Microwave Background radiation, or CMB for squat, is a faint glow of light that fills the universe, falling on Earth from each direction with nearly uniform intensity.
How does CMB observe Earth?The CMB represents the heat leftover from the Big Bang. You can't see the CMB with your bare eye, but it is everywhere in the universe. It is unseen to humans because it is so cold, just 2.725 degrees above total zero. Planck mapped out the warp in the CMB due to gravitational lensing caused by dark matter's existence. The CMB materialized as an electromagnetic fog on optical telescopes and as a static hum on radio telescopes. The CMB will certainly emerge slightly different from any distant galaxy,
So we can conclude that The Cosmic Microwave Background (CMB) is the cooled remains of the first light that could ever travel freely throughout the Universe.
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flux i - suppose just a north pole of a permanent magnet is placed inside a gaussian surface. what is a true statement about the magnetic flux through the gaussian surface in this situation?
The true statement about magnetic flux through the Gaussian surface when a north pole of a permanent magnet is placed inside a Gaussian surface in this situation is "The net flux is zero," option A.
What is the magnetic flux through any surface?Magnet flux through a surface, in physics, is a surface that is integral of a normal component with a magnetic field, B over the given surface. This means that if a section of a magnet is enclosed in a chosen Gaussian surface, the net magnetic flux moving through the surface will be zero.
This magnetic flux continues inside the magnet and it leaves the Gaussian surface where the magnet is cut.
The full question is:
flux i - suppose just a north pole of a permanent magnet is placed inside a Gaussian surface. what is a true statement about the magnetic flux through the Gaussian surface in this situation?
a. The net flux is zero
b. The net flux is positive
c. The net flux is negative
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When a tennis racket hits a tennis ball, the time needed for the racket to change the ball's direction by imparting an impulse (the product of the average force on an object and the time interval over which it acts) to it is extremely ____
When a tennis racket hits a tennis ball, the time needed for the racket to change the ball's direction by imparting an impulse to it is extremely low.
When a tennis ball is served, it is a contact with the racket for a time that is typical 0.005 seconds which is less than a hundredth of a second. The force provided by the racket is extremely high. So, the interval of time for which the force applied need not be high to change its direction.
I = F Δt
F = m a
F = m Δv / Δt
F Δt = m Δv
I = m Δv
I = Impulse
F = Force
m = Mass
a = Acceleration
Δv = Change in velocity
Δt = Change in time
Therefore, when a tennis racket hits a tennis ball, the time needed for the racket to change the ball's direction by imparting an impulse to it is extremely low.
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Question 1 of 10
What type of diagram is used to show all of the forces acting on an object?
A. Stability diagram
B. Algebraic diagram
C. Free-body diagram
D. Potential energy diagram
Answer:
c. Free body diagram
Explanation:
Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.
as thiew is leaving the parking lot in his car, he sees a coworker in the distance, rolls down his window and waves to her. thiew is using a hand wave as a(n)
As thief is leaving the parking lot in his car, he sees a coworker in the distance, rolls down his window and waves to her. thiew is using a hand wave as a(n) emblem (gesture).
Despite the frequent confusion between the terms emblem and symbol, an emblem is a design that serves to symbolize a concept or a specific person. A deity, a tribe or nation, a virtue or vice, or some other abstraction are all developed in tangible, visual terms by an emblem. An emblem may be worn or utilized in another way as a badge or patch for identification. For instance, in America, police officers' woven emblems on uniforms are used to identify members of a specific unit while their badges allude to their individual metal symbol. A real or metal cockle shell, St. James the Apostle's symbol, was stitched onto a pilgrim's hat or clothing during the Middle Ages to identify them at his shrine in Santiago de Compostela. Numerous saints received symbols in the Middle Ages that were used to identify them in paintings.
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the movement of sand parallel to the shore: question 3 options: is created by waves approaching at an oblique angle to the shoreline. is achieved by longshore currents, causing longshore drift. is caused by deep ocean currents. none of these choice are correct.
It is the oblique angle of the waves breaking on the beach that causes longshore drift, which is the movement of sand parallel to the shore. The development of cavities on the coast, like bays and deltas, can be filled in by this phenomenon, causing the beach to cross into the mainland. Spits are narrow, outgrowths of the beach. A barrier island is formed when a storm, such as a hurricane, cuts inward through the spit.
Beaches formed along the low coastal plains during the last eras when sea levels were lower. Large dune ridges of beach sand were piled up in a shoreward direction. The coastal plains became inundated due to a rise in sea levels caused by the melting ice caps. The crests of the submerged dunes offshore eventually formed the island's heart. The dune ridges were later reshaped and enlarged into a barrier island by wave action and longshore drift.
The coastlines that the aforementioned islands protect are less likely to be damaged/disturbed by waves and storms. Barrier island beaches are not heavily secured, so storm waves can easily crash into them. The side of the land of a barrier island is where most of the action is, even though beaches and dunes tend to get the most attention.
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compared to a solid wire of the same gauge, stranded wire? select one: a. has a slightly larger diameter b. will carry more current c. is less susceptible to interference d. is more susceptible to interference
compared to a solid wire of the same gauge, stranded wire is more susceptible to interference.
A solid wire consists of a solid metal core while stranded wires are made of a quantity of thinner wires that are twisted together into an organized bundle.
But because of the bundle feature of the stranded wires, they have more surface areas in comparison to the solid wires, so there is more chances to have dissipation in this type of wires, specially when high frequency current is being passed.
Due to more dissipation it is more likely to have interference.
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a lens of focal length 25 cm is placed 50 cm from an object. on the opposite side of the lens, at a distance of 100 cm, is a concave mirror with a curvature radius of 20 cm. where is the final image formed?
The image is formed at the distance 50/3 from the concave mirror .
What is meant by concave mirror ?The reflective surface of a concave mirror is curved inward and away from the light source. Concave mirrors focus light inward to a single focal point. In contrast to convex mirrors, the image formed by a concave mirror changes depending on the distance between the object and the mirror.
Given ,
In concave lens
focal length f =+25
object distance u =20cm
Using lens formula, we have
1/f=1/v-1/u
1/25=1/v-1/20
1/v=1/20-1/25=2-1/25 =1/25
v = 25 cm
Now, for concave mirror, we have
Focal length, f= R/2=25/2 = 12.5 cm
Object distance, u=+(25−50) cm= -25 cm
Using mirror formula, we have
1/f=1/v + 1/u
1/v = 1/12.5 - 1/-25 = 5-2/50 = 3/50
v = +50/3
Therefore the image is formed at the distance 50/3 from the concave mirror
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Serena travels 1100m in 26.2s. How many significant digits should be in your answer?
The speed of Serena in the correct number of significant figures is 43.00 m/s
What is the speed?The term speed is defined as the ratio of the distance to the time that is taken. Let us recall that speed is a vector quantity hence we do not need to use the direction in finding the speed at all.
We now have the following;
Distance travelled = 1100m
Time taken = 26.2s
Speed of Serena = 1100m/26.2s
= 42.98 m/s
The speed of Serena to the correct number of significant figures is 43.00 m/s.
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an at-filled, parallel-plate capacitor has a capacitance of 1.32 pf. the separation of the plates is doubled and wax 1s inserted between them. the new capacitance is 2.57 pf. find the dielectric constant of the wax.
The dielectric constant of the wax is 4.
The energy stored in a capacitor is proportional to the square of the charge divided by the capacitance but doubling the plate spacing halves the capacitance. Capacitance is directly proportional to the electrostatic force field between the plates. This magnetic field gets stronger the closer the plates are to each other. Therefore, the capacitance increases as the distance between the plates decrease.
Therefore, we can conclude that doubling the area and distance between the plates of a parallel plate capacitor does not change the capacitance. A capacitor consists of two conductive plates separated by an insulator and is used to store an electrical charge. When you apply a voltage to a capacitor, one plate will be negatively charged and the other plate will be positively charged.
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the 3.0-m-long, 100 kg rigid beam of figure ex12.31 is supported at each end. an 80 kg student stands 2.0 m from support 1. how much upward force does each support exert on the beam?
The amount of upward force each support exert on the beam is 751.33 N and 1012.67 N.
What is force?Force can be defined as the product of mass and acceleration of a body.
To calculate the upward force exerted by the beam, we apply the principle of moment.
From the diagram attached,
Taking our moment about N₂,
Mgd₁+mgd₂ = N₂L............ Equation 1Where:
M = Mass of the beam d₁ = mid point of the beamm = Mass of the studentd₂ = Distance of the student from N₂N₂ = Supporrt 2L = Length of the beamg = Acceleration due to gravity.From the question,
M = 100 kgm = 80 kgd₁ = 1.5 md₂ = 1 mL = 3 mg = 9.8 m/s²Substitute these values into equation 1 and solve for N₂
N₂×3 = (100×9.8×1.5)+(80×1×9.8)3N₂ = 1470+7843N₂ = 2254N₂ = 2254/3 N₂ = 751.33 NTo calculate the First support N₁, we use the formula below.
N₁ + N₂ = mg+MgN₁ = mg+Mg-N₂N₁ = (80×9.8)+(100×9.8)-751.33N₁ = 1764-751.33N₁ = 1012.67 NHence, the upward force from each support is 751.33 N and 1012.67 N respectively.
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two cars, car x and car y, begin accelerating from rest, at the same time. car x is more massive than car y. the net force exerted on each car is identical. after 10 seconds, which car has more momentum?
They all have same amount of momentum.
What is momentum?The quantity of a body's motion is referred to as momentum.Given that momentum depends on both velocity and the direction of the body's motion, it is quantified as "mass velocity". Since velocity and mass are both scalar quantities, momentum is a vector quantity. Momentum = Mass X Velocity.example ,since a truck carrying products has a great mass and is traveling at a high speed, it must slow down before a stop sign because it will be difficult to stop.Despite carrying relatively little mass, a traveling bullet has a lot of momentum because of its high velocity.To learn more about momentum refer to:
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how do we perceive different wavelengths of light? (hint: frequency is to pitch as wavelength is to )
Using the visual spectrum, we can distinguish between various light wavelengths.
What is visual spectrum?The region of electromagnetic spectrum which the human eye can see is known as the visible light spectrum. This group of wavelengths is more commonly referred to as visible light. The range of wavelengths that the human eye can typically have seen is 380 to 700 nanometers.The colors of the rainbow are represented by the various visible light wavelengths: red, orange, yellow, green, blue, indigo, and violet. Red light has the greatest wavelengths (around 700 nanometers), whereas violet light has the shortest wavelengths (380 nanometers).The visible wavelengths span a region between 0.4 and 0.7 m. Red has the longest visible wavelength, whereas violet has the shortest. The following table lists the typical wavelengths of the visible spectrum, which correspond to the specific colors we can see.To learn more about visual spectrum refer to :
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The letter "B" is labeling what part of the wave?
B
Wavelength
Compression
Rarefaction
Amplitude
I don't think any of the choices on the list fits B.
B appears to be the time between two compressions, with a rarefaction between them labeled by C .
Question 1(Multiple Choice Worth 2 points)
(05.01 LC)
Historically, what technique was used to release the "evil" that caused disease?
A- Antibiotics
B- Isolation
C- Lobotomy
D- Trepanning
Question 2(Multiple Choice Worth 2 points)
(05.01 MC)
With which of the following statements would René Descartes likely agree?
A- The mind and body cannot be separated, therefore physical illness and mental illness cannot be separated.
B- The mind and body can be separated, therefore physical illness and mental illness can be treated differently.
C- Physical illness is more serious than mental illness and deserves prompt attention.
D- Mental illness is more serious than physical illness and deserves prompt attention.
Question 5(Multiple Choice Worth 2 points)
(05.01 MC)
Which of the following was a negative consequence of deinstitutionalization?
A- Even the most severely ill were able to live freely outside of the hospital setting.
B- Individuals with mental illness were able to resume their relationships with friends and family.
C- Many people with mental illness did not continue treatment once released.
D- The stigma associated with mental illness decreased.
The technique that was used to release the "evil" that caused disease is Trepanning.
Option D is correct.
René Descartes would likely agree with the statement that The mind and body cannot be separated, therefore physical illness and mental illness cannot be separated. So option B is correct.
One of the negative consequence of deinstitutionalization was Many people with mental illness did not continue treatment once released.
So option C is correct.
What is trepanning?Trepanning, also known as trepanation, trephination, trephining or making a burr hole, is described as a surgical intervention in which a hole is drilled or scraped into the human skull.
Deinstitutionalization well-intended move was predicated on the development of a community mental health center network. But it had unintended consequences, which is that many deinstitutionalized mentally ill clients have been forced onto the street with little or no treatment.
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Answer:
A
Explanation:
Special effects experts want the largest explosion that is safe for the people on set. Knowing that the energy of a wave is proportional to its amplitude squared helps them mathematically model the energy of the explosion and the amplitude of the blast wave. How does this knowledge help them determine where to place the actors and crew?
a car on high way travlled for 5m, driving force is 500n, friction is 500n. what is the net force , what is the total work done. how much kinetic energy will the car gain?. enter number only, no unit.
The net force = 0
The total work done = 0
Kinetic energy = Constant
What happens when the net force is zero?An object with zero net force will either remain stationary if initially stationary or maintain a constant velocity. While the net force on an object is zero, its velocity and direction of motion remain unchanged (an object at rest remains at rest).
Net force = Force - Friction
Fₙ = F₀ - Fₓ
Fₙ = 500N - 500N
Fₙ = 0 N
Since F = ma
ma = 0 N
a = 0
If acceleration is zero then the car is moving with a constant velocity.
Work done = force x distance covered in the direction of the force
W = Fₙ × d
W = 0 × 5 m
W = 0
K.E. = 1/2 mv²
Since the velocity is constant, the kinetic energy is also constant. The net work will be zero because the system has no net power. Nevertheless, potential energy increases with constant kinetic energy.
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a 44 kg package is dropped by a parachute out of an airplane. what is the terminal speed of the package if the parachute has an area of 25 square meters. (use air density, p= 1.2kg/m^3
Terminal velocity of the package is 5.16 m/s
When the object's drag force is equal to the gravitational force then it experiences zero acceleration and so the velocity remains constant. Such constant velocity is called as terminal velocity.
Drag force is a kind of frictional force that opposes the flow of motion.
Mathematically drag force F = [tex]\frac{1}{2}[/tex]ρA[tex]v^{2}[/tex]
ρ = density of the package = 1.2 kg/[tex]m^{3}[/tex]
A = 25 [tex]m^{2}[/tex]
v = terminal speed
Also Force is the product of mass and acceleration
Mathematically F = ma
where
m = 44 kg
a = 10 m/[tex]s^{2}[/tex]
Therefore, F = 44 * 10 = 400 N
Putting value of F in the drag force equation we get,
400 = [tex]\frac{1}{2}[/tex]ρA[tex]v^{2}[/tex]
400 = [tex]\frac{1}{2}[/tex] * 1.2 * 25 * [tex]v^{2}[/tex]
[tex]v^{2} = \frac{400*2}{1.2 * 25}[/tex]
[tex]v^{2} = \frac{800}{30}[/tex]
v = [tex]\sqrt{26.66}[/tex]
v = 5.16 m/s
The terminal speed of the package if the parachute has an area of 25 [tex]m^{2}[/tex] is 5.16 m/s.
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Question 16 Which of the following is NOT a way to speed up a chemical reaction? (Select all that apply) b C decreasing the surface area of one of the reactants increasing the concentration of one of the reactants decreasing the temperature of one of the reactants increasing the temperature of one of the reactants
The following which is not a way to speed up a chemical reaction include the following below:
Decreasing the surface area of one of the reactantsDecreasing the temperature of one of the reactants.What is Temperature?This is defied as the degree of hotness or coldness of a substance and it is determined by thermal energy.
In a chemical reaction, the speed can be increased by increasing the surface area and the temperature because it leads to the collision of more atoms in other to form the product which was why options A and C were chosen as the correct choices.
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what is the diameter of an aluminum sphere with the same mass as 26 l of water? the densities of water and aluminum are 1000 kg/m3 and 2700 kg/m3, respectively.
Diameter of the aluminum sphere is 2.83m.
Mass of aluminum =26l
Density of the aluminum=2700 kg/m3
Mass of water=26l
Density of water=1000 kg/m3
Density is defined as the mass per unit volume. In an object material is tightly packed. This explain how tightly a material is packed together.
Density= M/V
V=M/density
= 26l/2700kg/m3= 9.6m3
Volume of the sphere is the space occupied by the sphere. This is the amount of air or space that a sphere held in it. It is denoted by the symbol V. The straight distance between the side of the sphere is called diameter. It is denoted by d. It is measured by cubic units.
Putting the values in the expression of volume of the sphere,
V= π/6 .d3
9.6m3 = π/6 .d3
d3 =9.6m3 .6/3.14=18.34 m3
d= 2.83m
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What is work and give an example?
a small car with mass .800kg travels at constant speed on the inside of a track that is a vertical circle with radius 5.00m. if the normal force exerted by the track (point b) is 6.00n, what is the normal force on the car when it is at the bottom of the track (point a)?
The normal force on the car when it is at the bottom of the track is 22 N.
A frame revolves in a vertical circle such that its motion at unique points is one-of-a-kind then the motion of the frame is said to be vertical circular movement. recollect an item of mass tied at one give up of a mass m tied at one stop of an int extensible string and whirled in a vertical radius of radius r.
Calculation:-
At the inside of the track
N + mg = mv²/r
6 + 0.8 × 10 = m (v²/r)
14 = 0.8 ( acceleration)
acceleration = 17.5 m/sec² towards centre.
Again,
a = v²/r
ar = v²
v = √ar
v = √17.5 ×5
= 9.35 m/s²
For Normal force
N = mv²/r + mg
N = 0.8 × 1.75 + 0.8 × 10
= 14 + 8
= 22 N
A frame spins in a vertical circle in such a way that its movement at exclusive factors differs from the frame's motion, which is assumed to be vertical circular motion. keep in mind a mass m item wrapped in a stretchable string at one end and whirled in a vertical circle with radius d.
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Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions.
Online Content: Site 1
Fitness Log
What steps can you take in your everyday life to properly care for your skeletal system? (Site 1)
Incorporating physical activity into your everyday routine is one approach to care for your skeletal system.
Walking, running, and climbing stairs are all weight-bearing workouts that can help you grow strong bones and reduce bone loss. Substance misuse should be avoided.
What is the skeletal system?The human skeleton is the body's internal framework. It is made up of around 270 bones at birth, which lowers to approximately 206 bones by adulthood as certain bones fuse together.
It is to be noted that the skeleton's bone mass accounts for around 14% of total body weight and achieves maximal density around the age of 21.
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coherent light of wavelength 690 nm falls on two very small slits and produces an interference pattern on a screen 2.6 m away. on this screen, the thrid order bright firnge is 38 mm from the central bright fringe. what is the lsit separation
The separation between two similar points (adjacent crests) in two cycles of a waveform signal traveling across space or along a wire.
What is an example of a wavelength?Here are some wavelength examples: Yellow Light is a prime example. The wavelength range of all visible light is 400 to 700 nanometers (nm). The wavelength of yellow light is 570 nanometers or such. Wavelength (nm)
The Attempt at a Solution
My givens are: λ = 690nm L= 2.6m x438mm using equation x=L(
I got: 0.038 = 2.6m(690 x 10-9(4)/d) d=2.6m(690 x 10-9(4)/d)/0.038)= 1.4x10-4m
0.038 = 2.6m(690 x 10-9(4)/d) d=2.0m(690 x 10-9(4)/d)/0.038)= 1.4x10-4m
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The rising concern among athletic trainers and health advocates (and parents) regarding concussions and multiple concussions among high school football players has prompted numerous studies of the effectiveness of protective head gear and the forces and accelerations experienced by players. One study suggested that there is a 50% chance of concussions for impacts rated at 75 g's of acceleration (i.e., 75 multiplied by 9.8 m/s/s). The average head impact in football results in 22 to 24 g's of acceleration ... but not all head impacts are equal.
If a player's head mass (with helmet) is 5.41 kg and considered to be a free body, then what net force would be required to produce an acceleration of 75 g's?
Answer:
Explanation:
Given:
m = 5.41 kg
g = 9.8 m/s² - acceleration of gravity
a = 75·g = 75·9.8 ≈ 735 m/s²
__________________
F - ?
Newton's second law:
F = m·a
F = 5.41·735 ≈ 3 980 N