Energy is transferred.
What is Work?Every time labour is performed, energy is transmitted, as shown by the definition of work in physics. Work is the result of the displacement's magnitude and the component of force acting in that direction.
What are 3 types of work done?
Positive Negative Zero work done.Work is the result of force and distance, or the force exerted over a specific distance. In other words, Work = Force x Distance.
Joules are used to measure work.
1. Positive Work: Positive work is when a force moves an object in that direction. The motion of a ball descending toward the earth while it is displaced in the direction of the force of gravity is an illustration of this type of labour.
2. Negative Work: The work is said to be negative if the force and the displacement are in the opposing directions. For instance, if a ball is thrown high, its displacement will also be upwards, while the force from the earth's gravity will be downward.
3. Zero Work: When the force and displacement directions are parallel to one another, there is no work done on the item by the force.
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Answer:Energy is transferred.
Explanation: Took the test and Passed
When voltage is applied to a dc motor but
the armature is not turning, this condition is
called
A dc motor has armature failure when voltage is applied but the armature is not rotating.
To find the answer, we need to know more about the working of motor.
What is an armature and how it works?The armature's job is to continuously produce a magnetic field, which, along with the magnetic field generated by the stator windings, causes the rotor (or armature) to rotate.Due to the relative motion between the flux provided by the field winding and the flux produced by the armature winding, an EMF is created when the armature is utilized as an electric motor.This EMF will oppose the torque generated in the rotor and the current flowing through an armature. As a result, mechanical power is created from electrical power. A shaft is used to transmit the toque generated in the rotor to rotate other objects.The most common fault with armatures is worn commutators, caused by the friction of carbon brushes against the commutator surface. Over time the insulation between the commutator segments becomes proud as the copper of the commutator surface wears away.Thus, we can conclude that, a dc motor has armature failure when voltage is applied but the armature is not rotating.
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What must be done to the refrigerant that is vented off the top when filling a charging cylinder?
When transporting cylinders contain used refrigerant?
The DOT mandates that DOT Classification Tags, such as those shown above, be attached to cylinders that contain used refrigerant. DOT classification tags show the substance's level of hazard and are arranged according to class. For instance, Class 2, which is gases, would include refrigerant gases.What must be done before shipping any used refrigerant in a cylinder?
Check that the cylinder complies with DOT requirements before sending any old refrigerant cylinders, fill out the shipping paperwork with the quantity of each refrigerant, and clearly mark the cylinder with the kind and amount of refrigerant. Transporting cylinders should be done standing up.Learn more about refrigerant of cylinder
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21. A person standing 49.5m from the foot of a cliff claps his hands and hears an echo 0.3
seconds later. Calculate the velocity of the sound in air
Answer:
330 m/s
Explanation:
The sound wave has to travel TO the cliff AND back = 2 * 49.5 = 99 m
magnitude of velocity = distance / time = 99m / .3 s = 330 m/s
A capacitor is connected to an ac supply. increasing the frequency of the supply _________ the current through the capacitor
A capacitor is connected to an ac supply. increasing the frequency of the supply increases the current through the capacitor
A capacitor is a device for storing electrical energy that consists of two insulated conductors in close proximity. The parallel-plate capacitor is a simple example of such a storage device.
A capacitor (also known as a condenser) is a two-terminal passive electrical component that stores energy electrostatically in an electric field. Practical capacitors come in a variety of shapes and sizes, but they all have at least two electrical conductors (plates) separated by a dielectric (i.e., insulator).
Capacitors exist in various shapes and sizes, and their value is measured in farads (F). Capacitors are utilized in both alternating current and direct current systems.
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Two planets, alice and bob, have the same radius. Alice has a greater density than bob. Which has the higher escape velocity?
Answer:
Since Alice has a greater density it will also have a greater mass
Density = mass / volume
The potential energy at the surface of Alice will be greater and a higher kinetic energy will be required to escape the planet's gravitational pull.
PE = K M / R potential at surface is greater because mass is greater
KE = 1/2 M v^2 greater velocity required to overcome PE
The hockey player is moving at a speed of 9. 5 m/s. if it takes him 2 seconds to come to a stop under constant acceleration, how far does he travel while stopping?
Answer:
[tex]9.5\; {\rm m}[/tex].
Explanation:
Let [tex]u[/tex] and [tex]v[/tex] denote the velocity of this hockey player before and after stopping, respectively. The question states that [tex]u = 9.5\; {\rm m\cdot s^{-1}}[/tex] and implies that [tex]v = 0\; {\rm m\cdot s^{-1}[/tex] since the hockey player has come to a stop.
The duration of this acceleration is [tex]t = 2\; {\rm s}[/tex].
Since the acceleration of this hockey player was constant, SUVAT equation would apply. In particular, the SUVAT equation [tex]x = (1/2)\, (v + u) \, (t)[/tex] gives the displacement [tex]x[/tex] of this hockey player during that [tex]2\; {\rm s}[/tex] of acceleration:
[tex]\begin{aligned} x &= \frac{1}{2}\, (9.5\; {\rm m\cdot s^{-1}} + 0\; {\rm m\cdot s^{-1}})\, (2\; {\rm s}) = 9.5\; {\rm m} \end{aligned}[/tex].
In other words, this hockey player would have travelled [tex]9.5\; {\rm m}[/tex] while stopping.
What is the momentum of a tiger that has a mass of 81 kg and runs with a velocity of 5. 4 m/s to the east? (1 point)
The momentum of a tiger that has a mass of 81 kg and runs with a velocity of 5. 4 m/s to the east will be 437.4 Kg m/s in east direction.
Momentum is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity broadly .It is a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force.
momentum = mass * velocity
given
mass of tiger = 81 kg
velocity of tiger = 5.4 m/s
since ,
momentum = m * v
= 81 * 5.4 = 437.4 Kg m/s
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Which wavelength of light is the best choice when attempting to quantitatively relate solution absorbance and concentration?.
310 nm
310 nm wavelength of light is the best choice when attempting to quantitatively relate solution absorbance and concentration.
What does beer lambert law state?The Beer-Lambert law states that "the quantity of light absorbed by a substance dissolved in a fully transmitting solvent is directly proportional to the concentration of the substance and the path length of the light through the solution."
Here, the wavelength for absorption is 310 nm. We confirmed that the largest aggregation happens at this wavelength based on the preliminary experiments. Your spectrum measurements may be repeated at a very low concentration. From there, you may deduce the concentration and maximum absorbance at the relevant wavelength.Applications of Beer-Lambert law:Beer-law Lambert's is used to analyze a combination using spectrophotometry without the sample needing to go through a lot of pre-processing. The measurement of bilirubin in blood plasma samples is one example. Since the molar absorbance is known, the spectrum of pure bilirubin is also known.Limitations of Beer-Lambert law:light scattering as a result of sample-related particles. the sample's fluorescence or phosphorescence. refractive index modifications at high analyte concentrations. alterations in chemical equilibrium that occur as a result of concentration.To learn more about Beer-Lambert law visit:
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When the atmosphere becomes loaded with particles, only the _____ wavelengths are able to penetrate the atmosphere.
Visible light are able to penetrate the atmosphere
What is Wavelength?A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. This length is often defined in wireless systems in metres (m), centimetres (cm), or millimetres (mm).
The electromagnetic spectrum is made up of a variety of electromagnetic radiations, including radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays. Because the earth's atmosphere blocks off the majority of the electromagnetic spectrum's wavelengths, most electromagnetic energy from space cannot reach the planet's surface.
. A portion of the electromagnetic spectrum that humans can see with our eyes is the visible light or spectrum. The electromagnetic spectrum's band that can most easily reach Earth's surface is also this one.
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PLEASE ANSWER ASAP!
Lai is trying to listen to a radio station for weather updates during a storm. The storm is causing electrical interference that affects radio waves. She knows that the weather station broadcasts both an analog and a digital radio signal.
Which signal would most likely be clearer during this storm, and how do you know?
(Choice A)
The analog signal because it can always be heard even when interference is high.
(Choice B)
The analog signal because interference can be filtered out of the signal.
(Choice C)
The digital signal because it can always be heard even when interference is high.
(Choice D)
The digital signal because interference can be filtered out of the signal.
The digital signal can always be always be heard even when interference is high. Option D
What is a radio signal?A radio signal makes use of the radio waves. The radio waves are long wavelength electromagnetic waves which are able to travel across a long distance. The signal can be transmitted in both analogue and digital formats.
However, the digital signal seems to be free from certain interferences that are caused by the scattering of the waves across distances. This could diminish the quality of sound that is heard.
Thus, the digital signal can always be always be heard even when interference is high.
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The resistance of platinum thermometer is 5.7 5.5, 5.2 at boiling point,
unknown temperature, θ, and at the freezing point of water respectively.
Determine the unknown temperature in θ°C.
The unknown temperature is 64°C
Given,
Resistance at ice point,R[tex]_{0}[/tex] =5.2Ω,
Resistance at steam point,R[tex]_{100}[/tex] = 5.7Ω,
Resistance when dip in unknow, R[tex]_{t}[/tex] = 5.5Ω,
R[tex]_{100}[/tex] = R[tex]_{0}[/tex] (1+α100)
α = R[tex]_{100}[/tex]-R[tex]_{0}[/tex] / R[tex]_{0}[/tex]×100
α = 0.00096 = 9×[tex]10^{-4}[/tex]°C[tex]^{-1}[/tex]
Let the temperature of hot bath = t°C
R[tex]_{t}[/tex] = R[tex]_{0}[/tex](1+αt)
t = R[tex]_{t}[/tex]- R[tex]_{0}[/tex] / R[tex]_{0}[/tex] α
t = 0.3 / 0.00468
t = 64°C
The unknown temperature is 64°C.
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If you illuminate red paint with pure blue light, what color will that paint appear?
The red paint will appear no colour when it is illuminated with pure blue light.
Why does a red colour appear as red?When visible light of all wavelengths incident on a red coloured object, it absorbs all the wavelengths accept red colour.So it is reflected from its surface and makes the object red.What does happen when red coloured object is illuminated by pure blue light?As the pure blue light has no red coloured wavelength, so the object cannot reflect the red light wavelength. So we will get no reflection from the object.Thus, we can conclude that the red coloured object appears colourless as it is illustrated by pure blue light.
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Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum
Answer:
The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe.
A ball is dropped from a height of 6ft. whenever it hits the ground it bounces back to half its original height. what is the total distance the ball travels dropping and rebounding?
The ball has travelled a total distance of 18 feet after dropping and rebounding.
After being dropped for the first time, the ball will rebound to a height of 3 feet as it returns to half its original height. The geometric series formed by the total distance travelled while falling and rebounding has a common ratio,
r = 0.5
6 ft + 3 ft = 9 ft will be the first term in the series
For the sum formula S = [tex]\frac{a}{1-r}[/tex],
substitute a = 9 and r = 0.5 to get the ball's total distance travelled.
S = [tex]\frac{9}{1-0.5}[/tex]
S = [tex]} \frac{9}{0.5}[/tex]
S = 18
The ball has therefore travelled a total of 18 feet.
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What is the distance to the nearest antinode from the fixed end of a guitar string vibrating at its first harmonic?
What is the distance to the nearest antinode from the fixed end of a guitar string vibrating at its first harmonic? /4
What is antinode in a guitar?The wave at every given instant resembles a graph of a sine wave because the antinodes alternate in the wave's displacement direction. The nodes on a guitar string are the locations where harmonics can be produced the greatest, especially at the 12th fret. The sound is muffled by touching the antinodes.
Halfway between the string's anchor points and the node, or between 1/4 and 3/4 of the string's overall length, are the most audible and vibrating points of these harmonics (called antodes).
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Assuming a mass of 0.04-g, what is the power exerted by the electrical forces on a fragment of fiber if the fragment has a velocity of 200 mm/s, 10 ms after ejection?
8.0× 10⁻⁵ Watts is the power exerted
What is Power, Energy and Work done?Physics' three essential notions are work, energy, and power. When a force (push or pull) given to an item results in the displacement of the object, that force is said to have performed work. Energy is how we describe the ability to perform the task. Power is the amount of work completed in a given amount of time.
mass of the body = 0.04 g = 4.0 × 10^-5 kg
velocity of the body = 200mm/s = 0.2 m/s
Kinetic energy of the body = 1/2 × 4.0 × 10^-5 × 0.2^2
Kinetic energy of the body = 8.0× 10^-7
Thus, work done = 8.0× 10^-7 J
Power = work done/ time
Power exerted = 8.0× 10^-7/0.01
Power exerted = 8.0× 10^-5 Watts
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What is the maximum number of grams of fat recommended on a 2000-kcalorie diet based on the daily value?
a. 34
b. 45
c. 78
d. 56
e. 67
The maximum number of grams of fat recommended on a 2000-kcalorie diet based on the daily value is around 65 grams,therefore option (e)
The term "daily value" (DV) describes how much of a nutrient you should eat daily based on a diet of 2,000 calories.On the FDA website, you may obtain the daily values for a variety of nutrients. In order to meet the average adult's energy requirements, the FDA picked 2,000 calories.Fat intake must be kept to a minimum. A 2,000 calorie diet per day should contain no more than 65 grammes of total fat, 20 grammes or less of saturated fat, and trace levels of trans fat. Trans fats are bad because they narrow our arteries, increasing our risk of coronary heart disease.Learn more about daily value from here:https://brainly.com/question/23095932
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A runner exerts 2,000 j of work while traveling 10 m along a horizontal stretch of track. what average force was exerted by the runner?
The average force exerted by the runner is 200N.
A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
When a force is exerted across a distance to an item, work is accomplished. This implies that the total energy of an object will be impacted when a force is applied to it over a distance.
Work = Force x Distance
Force = work / distance
Force = 2000 J / 10 m
Force = 200 N
Hence, the average force exerted by the runner was 200N.
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The critical path is the sequence of activities that determine the latest date by which the project can be evaluated.
a. true
b. false
The statement given about the critical path is true.
To find the answer, we have to know more about the critical path.
What is critical path?The longest series of tasks in a project plan that must be finished on time for it to be finished by the deadline is known as the critical path. The critical route is the set of actions that, when carried out in a timely manner while taking into account all the aforementioned factors, will take the longest to accomplish the project. Because it is the "red alert" of paths, the critical path is referred to as "critical". Your project won't be successfully completed before the deadline if it doesn't follow the critical path's timing and order.Thus, we can conclude that, the statement given about the critical path is true.
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A string with mass density equal to 0. 0025 kg/m is fixed at both ends and at a tension of 290 n. resonant frequencies are found at 558 hz and the next one at 744 hz. what is the length of the wire?
A string with mass density equal to 0. 0025 kg/m is fixed at both ends and at a tension of 290 n. Resonant frequencies are found at 558 Hz and the next one at 744 Hz. The length of the wire will be L = 0.91 m
A resonant frequency of a string is its natural frequency of a standing wave that is produced in it. The standing waves in the string are called harmonics. A string of a fixed length can have many standing waves. The frequencies of these standing waves are called resonant frequencies.
frequency = 1 / 2L ([tex]\sqrt{\frac{T}{mu} }[/tex])
L = length of the spring
T = Tension
fundamental frequency = 744 - 558 = 186 Hz
186 = 1/2(L) ([tex]\sqrt{\frac{290}{0. 0025 } }[/tex])
L = 340 / (186 * 2)
L = 0.91 m
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How many minutes will it take to plate out 16. 22 g of al metal from a solution of al 3 using a current of 12. 9 amps in an electrolytic cell?
It will take 103 minutes to plate out 16. 22 g of al metal from a solution of al 3 using a current of 12. 9 amps in an electrolytic cell
Electrolytic cell, any device in which electrical energy is converted to chemical energy, or vice versa. Such a cell typically consists of two metallic or electronic conductors (electrodes) held apart from each other and in contact with an electrolyte (q.v.), usually a dissolved or fused ionic compound
First, look at the reaction to decided how many moles of electrons it will take:
Al3+ + 3e ------> Al(s)
It takes 3 electrons to convert 1 mole of Al3+
Next, figure out how many moles of Al metal you want:
I mole of Al mass = 26 g
1 g of Al will have = 1/26 moles
16. 22 g of al metal will have = 16.22 / 26 moles 0.624 moles
since , their are 3 electrons
0.624 x 3= 1.87 moles of electrons
using Faraday constant to find the number of coulombs (C) needed:
1 faraday = 96500 C per mole
1.87 x 96500 = 180455
Since, 1 amp = 1 C/sec,, time needed to supply a current of 12.9 amp will be
80455C / 12.9 C = 6236.82 sec = 103 minutes
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We know that an electric field contains energy. What causes the electric field itself?
A
electrical charges on one or more particles within the field
B
the combined mass of all particles in the field
C
the degree of magnitization of particles within the field
D
No-one really knows, the field is just always there.
Electrical charges on one or more particles within the field cause the electric field
Each point in space has an electric field associated with it when a charge of any kind is present. The value of E, often known as the electric field strength, electric field intensity, or just the electric field, expresses the strength and direction of the electric field
A region of space surrounding an electrically charged particle or object known as an electric field is one in which an electric charge would experience force. A vector quantity called an electric field can be represented by arrows pointing in the direction of or away from charges. The force per unit charge exerted on a positive test charge that is at rest at a given position is the force per unit charge that is used to define the electric field analytically.
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Does the response of the light bulb depend on how fast you move the bar magnet? if so, how?
Yes , the response of the light bulb depend on how fast you move the bar magnet
Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface
Lenz's law states that the induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that the original flux is maintained through the loop when current flows in it.
Yes, waving a magnet around does create an electromagnetic wave which does affect the light bulb .
Due to motion of the bar, there will be a constant change in flux and due to Lenz's Law a current within the coil will be induced . This induced current can be used to power the light bulb.
As we know that the greater the speed, the greater the magnitude of the current, and the current is zero when there is no motion.
There will be change in brightness as the bar moves with faster speed.
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Write an expression for elastic potential energy of a spring?
[tex]\huge\underline{\underline{\boxed{\mathbb {SOLUTION:}}}}[/tex]
[tex]\leadsto[/tex] The elastic potential energy of a spring can be said to be the energy possessed by a spring due to a force that compresses or stretches the spring. This can also be said to be the work which is done by the applied force against the restoring force of the spring, which is stored as the elastic potential energy.
The elastic potential of a spring can be expressed as:
▪ [tex]\longrightarrow \sf{PE= \: \dfrac{1}{2} kx}[/tex]
[tex]\huge\underline{\underline{\boxed{\mathbb {ANSWER:}}}}[/tex]
[tex] \bm{PE= \: \dfrac{1}{2} kx}[/tex]
Driving safely at night requires seeing well not only in low light conditions, but also being able to see low contrast
Answer:
True
Explanation:
Driving safely at night requires seeing well not only under low light, but also requires drivers to see low-contrast objects.
Since nuclear fusion in the sun creates energy from matter, why doesn't it violate the law of conservation of energy?
Since nuclear fusion in the sun creates energy from matter, Einstein's formula E=mc² states that matter and energy are equal.
To find the answer, we have to know more about the nuclear fusion.
What is nuclear fusion?We are aware that the sun can achieve nuclear fusion by the fusion of hydrogen atoms. These atoms need to get closer to one another in order to fuse. Since both protons inside each nucleus are positively charged, they attempt to repel one another as they get closer to one another. If this issue cannot be solved, nuclear fusion in the sun cannot occur.Thus, we can conclude that, since nuclear fusion in the sun creates energy from matter, Einstein's formula E=mc² states that matter and energy are equal.
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For a 1 efficient step down transformer voltage in primary and secondary are equal current in primary and secondary are equal input power is same as the output power output power is zero
The given condition for a 100% efficient step down transformer is not true.
How do Step-down Transformers work?Because there are fewer turns in the secondary winding of a step-down transformer, the secondary voltage is lower than the initial voltage. As a result, this kind of transformer is employed to reduce the voltage to the levels intended for the circuit. Almost all power supply incorporate a step-down transformer to keep the operating voltage range of the circuit within acceptable limits. Electronic transformers and distribution systems are often where these transformers are installed (power transformers).
What Does a Step-Down Transformer Mean by Power?Using the system voltage and current, we can calculate the power of a transformer. Volt-Amps, or VA, is the unit used to measure the power in a transformer (for larger transformers Kilo Volt-Amps, kVA).
Any transformer should, in theory, have constant power on both sides, which implies that the power available on the secondary side of the transformer should match the power available on the primary side. This also applies to step-down transformers. A step-down transformer's secondary side has a lower voltage than its primary side, hence in order to balance the transformer's total power, the secondary current would need to be increased.
What is the Step-Down Transformer's Relationship Between Voltage and Current?In a step-down transformer, the output current is greater than the input current while the output voltage is lower than the primary voltage.
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If a radioactive decay produced 2. 05 × 1011 j of energy, how much mass was lost in the reaction?
The mass lost in the reaction is 0.227 × [tex]10^{-5}[/tex] Kg
The energy that is released during a nuclear reaction can be related to the mass lost using the Einstein equation.
E = m[tex]c^{2}[/tex] by Einstein demonstrates that matter and energy are only two different manifestations of the same thing. It also demonstrates how much energy (E) can fit into a relatively small mass (m) of matter. Nuclear processes convert matter into energy, yet the combined amount of mass and energy remains constant.
Given that;
E = Δ[tex]mc^{2}[/tex]
Δm = [tex]\frac{ E}{c^{2} }[/tex]
Δm = 2. 05 × 10^11 J/( 3 × 10^8)^2
Δm = 0.227 × [tex]10^{-5}[/tex] Kg
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The age of the dead sea scrolls was found by carbon-14 dating. could this technique have worked if they were carved in stone tablets? explain
A Final statement or concluding statement
No because this method of dating requires a material that was once living. So, this technique wouldn’t have worked.
Why carbon - 14 dating is not reliable?Carbon 14 gradually decays into other elements. However, when a plant or animal dies, it no longer has the ability to accumulate new carbon 14, and the supply in the organism at the time of death is gradually depleted.
Scientists can calculate the time elapsed since something died from its residual carbon 14 because the rate of depletion has been accurately determined (half of any given amount of carbon 14 decays in 5,730 years).
However, scientists have long recognized that carbon dating is subject to error due to a variety of factors, including contamination from outside carbon sources. As a result, they sought methods to calibrate and correct the carbon dating method.
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The schematic diagram below shows an induction cooktop being used to heat water in a steel pan.
Which of the following best explains how the water is heated?
A
The ceramic top plate heats up as the magnetic field transfers heat energy directly to the top plate. The pan and water are then heated by conduction.
B
The current from the coil is transferred by means of the magnetic field to the pan. The pan then induces a current in the water, which heats due to resistance.
C
The copper coil heats up as it resists the electric current. This heat is then transferred by convection through the ceramic cooktop and pan to the water.
D
The steel pan heats up as it resists the induced movement of electrons caused by the changing magnetic field. The water is heated by conduction.
The water is heated as the current from the coil is transferred by means of the magnetic field to the pan. The pan then induces a current in the water, which heats due to resistance. That is option B.
What is cooking by induction?Induction cooking is referred to the transfer of heat energy from one source to another through a magnetic field that helps in the movement of electrons.
Heat cannot be transferred to the water without changes of the magnetic field.
Other examples of how heat is being transferred to other body surfaces include the following:
Convention,Conduction,Evaporation and Radiation.Therefore, the diagram above displays the heat transfer from the copper coil carrying current to the water in the steel pan is by induction.
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