PLEASE HELP!!
What does the electromagnet in an electric motor do?
A. It transforms mechanical energy into electrical energy.
B. It transforms magnetic force into electrical energy.
C. It transforms electrical energy into mechanical energy.
D. It transforms electrical energy into magnetic force.
Answers
Answer:
C. It transforms electrical energy into mechanical energy
Answer: C
Explanation:
Related Questions
The screwdriver used by an electrician has a plastic or rubber covers on them why
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Answer:
Explanation:
Plastic or rubber are regarded as an insulator, and an insulator does not allow the flow of electric current through them, so the handles of screwdrivers as well as pliers that electricians use in repairing is been covered with plastic or rubber so that electric current is prevented to pass through it to the body of electricians to avoid been electrocuted as well as shock.
How is an emulsion different from other colloids?
Answers
Answer:
The difference between colloid and emulsion is that a colloid can form when any state of matter (solid, liquid or gas) combine with a liquid whereas an emulsion has two liquid components which are immiscible with each other
Explanation:
What causes infectious diseases?
O A. Organ malfunction
O B. Vitamin deficiency
OC. Pathogens
OD. Genes
Answers
Answer:
The answer is C
Hope it helps
Answer:
C. Pathogens
Explanation:
Help me with this question please
Answers
Answer:
the answer is A, 9.5 units
If the two variables in a given theory move in the same direction, which type of relationship do they share?
OA.
negative
о
B.
positive
OC.
neutral
OD.
inverse
Criminology
Answers
Answer:
inverse
Criminology
Explanation:
Answer:
positive
Explanation:
What kind of waves are present during an earthquake? ...
What kind of energy does an unlit match have? ...
Which of these is another way to write Newton's second law of motion? ...
What is it called when light changes direction after leaving a lens? ...
How do you calculate density?
Answers
Answer:
1. The two main types of waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves.
2. potential energy
3. Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
4. Refraction is the bending of light
5. Density uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). Density is defined as mass per unit volume.
Explanation:
check the dimensional consistencies of s =vot+1/2at2
Answers
Answer:
s is distance so it's dimensions become L.
Nd other side we have ut+1\2at^2.
as 1\2 is a constant it will have dimensions and apply the dimensions to other quantities.
on solving u will get L there also i,e ur LHS = RHS.
thus the equation is dimensionally consistent.
Explanation:
Musical instruments that produce sound by vibration of a stretched string
Answers
Answer:
Stringed instruments (chordophones).
Explanation:
Musical instruments that produce sound by vibration of a stretched string are called stringed instruments (chordophones).
Some examples of stringed instruments are guitar, piano, harp, violin, sitar etc.
A guitar can be defined as a musical instrument with six or twelve strings and a long fretted fingerboard that are being played using a plectrum or by strumming (plucking) with the fingers, usually in a downward direction.
Basically, a guitar is a musical instrument that produces sound through regular vibrations and as a result of this, it is used for creating uniform and melodious sounds.
Explain why can an object moves or remain
stationary if it has balanced forces acting on it
Answers
Answer:
A balanced force means that equal force is being applied to an object on opposite sides. If equal force is being applied, there will be no change in the motion of the object; it will remain stationary. A greater force needs to be applied to one side for movement to take place.
Explanation:
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Record the mass for each dialysis tube: A B 0% C 5% D 10% E 15% Mass (before): Mass (after): Difference:
Answers
Answer:
hey dont mind me just need points
Explanation:
Explain how the aperture geometry relates to the
diffraction pattern.
Answers
Answer:
The answer to this question is given below in the explanation section.
Explanation:
how the aperture geometry relates to the
diffraction pattern:
Diffraction is the spreading out of waves as they pass through an aperture or around objects.it occurs when the size of the aperture or obstacle is of the same order of magnitude as the wavelength of the incident wave.For every small aperture sizes,the vast majority of the wave is blocked.For large apertures the wave passes by or through the obstacle without any significant of diffraction.
in an aperture with width smaller than the wavelength,the wave transmitted through the aperture spreads all the way around the behave like a point sources of waves.
single slit diffraction pattern
The diffraction pattern made by waves passing through a slit of width [tex]\alpha[/tex] (larger than∫) can be understood by imagining a series of point sources all in phase along the width of the slit.The waves moving directly forward are all in phase,so they from a large central maximum.
if the waves travels at an angle Ф from the normal to the slit,then there is a path difference x between the waves production at the two end of the slit.
x=a sinΦ
The path difference between the top and middle waves is λ/2 then they are exactly out of phase and cancel each other out. This happens to all consecutive pairs of waves (the ones produced by the second source from the top and the second source past the middle etc.)at the angle so there is no resultant wave at this angle.Thus a minimum is the diffraction pattern is obtained at
λ=α sinθ
Now slit can be divided into four equal sections and the pairing of sources to give destructive interference can be repeated for the top two section ,which is identical to the result of pairing off matching sources in the bottom two sections.in this case we obtained from the minimum.
λ/2=α/4 sinθ
we can divided the slit aperture into six equal sections and pair off sources in the top two divisions and then the bottom two,to give destructive interference for every matched pair.The minimum of intensity are obtained at angles
nλ = α sinθ
where n is an integer (1,2,......), but not n=0.There is a maximum of intensity in the center of the pattern. This process only gives the position of the minima,does not work for positions of the maxima,and so does not give the intensities of the maxima.
What’s the substance that is formed as the result of a chemical reaction?
A. Chemical reaction
B. Catalyst
C. Activation energy
D. Collision theory
E. Products
F. Reactants
G. Reaction rate
Answers
Answer:
d
Explanation:
Objects with different masses have the same gravitational force acting
on them.
TRUE
FALSE
Answers
It’s false. The answer is False.
what are the difference between conductor and insulator?
Answers
Answer:
A conductor allows energy e.g. electric charge or heat to pass through it easily. While an insulator does not let electric current or heat to travel through it.Insulators have strong molecular bonds. While molecular bonds are very weak in conductors.Insulators have very low conductivity. While in conductors, it is very high.Insulators have a very high resistance and therefore the electrons are held together very firmly. The conductors, on the other hand, have a very low resistance.Insulators do not have any electric field, neither inside nor on the surface. While in conductors, it is found on the surface and continues to be zero in the inner part of the conductor.If we double the distance between two point charges then coulombs force will
Answers
Answer: The size of the force varies inversely as the distance square between the two charges. Thus, if the distance between the two charges is doubled, the attraction or repulsion will become weaker and decrease to one-fourth of the original value. The size of the force shall be proportional to the value of each charge.
Explanation:
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The owner of a window-treatment company wants to design shades that will cover the windows of a house. The shades should also warm the house by maximizing the absorption of solar energy coming through the windows.
Which kind of material would best accomplish this task?
black and textured
black and smooth
white and textured
white and smooth
Answers
black and textured is the answer
Answer:
D
Explanation:
What term means like a machine
Answers
The tendency to have more confidence in judgment and decisions than one should, based on probability or past experience is __________.
A.
belief bias
B.
overconfidence
C.
confirmation bias
D.
the availability heuristic
Answers
Answer:
Its B- overconfidence
Explanation:
The tendency to have more confidence in judgment and decisions than one should is called Overconfidence
What is overconfidence?
Overconfidence is a bias in which a person's subjective confidence is his or her judgement is reliably greater then the objective accuracy of those judgments when confidence is relatively high
Hence, The tendency to have more confidence in judgment and decisions than one should is called Overconfidence
correct answer : option B)Overconfidence
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Find the number of moles and the number of molecules in one cubic meter of air at 1 atmospheric pressure and 0C.
Answers
Answer:
The number of moles of the air is 4.464 x 10⁻⁴ mole
The number of molecules is 2.688 x 10²⁰ molecules
Explanation:
Given;
pressure of the air, P = 1 atm
volume of the air, V = 1 m³
temperature of the air, T = 0° C = 273 K
The number of moles of the air is calculated as;
PV = nRT
[tex]n = \frac{PV}{RT}[/tex]
where;
n is the number of moles
R is ideal gas constant = 8.2057m³atm/mol.k
[tex]n = \frac{1atm \ \times \ 1m^3}{(8.2057 \ m^3 atm/mol.K)(273 \ K)} = 4.464 \ \times 10^{-4} \ mol.[/tex]
The number of molecules is calculated as follows;
1 mole ---------------------> 6.022 x 10²³ molecules
4.464 x 10⁻⁴ mole ----------> ?
= (4.464 x 10⁻⁴) (6.022 x 10²³ molecules)
= 2.688 x 10²⁰ molecules of air.
what is electricity?
Answers
Explanation:
electricity is the flow of electrical power or charge
Explanation:
the flow of current is called electricity
activity will have the LEAST effect on your level of physical fitness?
Answers
Answer:
The correct answer is option D, Using an Electric mixer ( i hope this is the correct answer to what you are talking about because you didn't have any options but i gave out almost the same question to my students.)
Explanation:
Physical fitness is assured by activities in which our body is doing some kind of physical movements or exercise. In case of “walking to work “ the body is compelled to move or walk, in case of “carrying boxes up and down stairs” lot of physical work is done in both carrying the boxes and moving up and down the stairs, in the same way in case of “shoveling snow” some physical efforts are required to shovel the snow. But in case of using a electric mixer, the only work being done is the “pressing of ON/OFF button”. Thus , "using an electric mixer" will have the LEAST effect on your level of physical fitness
why is sound mechanical wave? long answer
Answers
As discussed in the previous unit of The Physics Classroom Tutorial, a wave can be described as a disturbance that travels through a medium, transporting energy from one location to another location. The medium is simply the material through which the disturbance is moving; it can be thought of as a series of interacting particles. The example of a slinky wave is often used to illustrate the nature of a wave. A disturbance is typically created within the slinky by the back and forth movement of the first coil of the slinky. The first coil becomes disturbed and begins to push or pull on the second coil. This push or pull on the second coil will displace the second coil from its equilibrium position. As the second coil becomes displaced, it begins to push or pull on the third coil; the push or pull on the third coil displaces it from its equilibrium position. As the third coil becomes displaced, it begins to push or pull on the fourth coil. This process continues in consecutive fashion, with each individual particle acting to displace the adjacent particle. Subsequently the disturbance travels through the slinky. As the disturbance moves from coil to coil, the energy that was originally introduced into the first coil is transported along the medium from one location to another.
A sound wave is similar in nature to a slinky wave for a variety of reasons. First, there is a medium that carries the disturbance from one location to another. Typically, this medium is air, though it could be any material such as water or steel. The medium is simply a series of interconnected and interacting particles. Second, there is an original source of the wave, some vibrating object capable of disturbing the first particle of the medium. The disturbance could be created by the vibrating vocal cords of a person, the vibrating string and soundboard of a guitar or violin, the vibrating tines of a tuning fork, or the vibrating diaphragm of a radio speaker. Third, the sound wave is transported from one location to another by means of particle-to-particle interaction. If the sound wave is moving through air, then as one air particle is displaced from its equilibrium position, it exerts a push or pull on its nearest neighbors, causing them to be displaced from their equilibrium position. This particle interaction continues throughout the entire medium, with each particle interacting and causing a disturbance of its nearest neighbors. Since a sound wave is a disturbance that is transported through a medium via the mechanism of particle-to-particle interaction, a sound wave is characterized as a mechanical wave. Production and Propagation of Sound Waves
The creation and propagation of sound waves are often demonstrated in class through the use of a tuning fork. A tuning fork is a metal object consisting of two tines capable of vibrating if struck by a rubber hammer or mallet. As the tines of the tuning forks vibrate back and forth, they begin to disturb surrounding air molecules. These disturbances are passed on to adjacent air molecules by the mechanism of particle interaction. The motion of the disturbance, originating at the tines of the tuning fork and traveling through the medium (in this case, air) is what is referred to as a sound wave. The generation and propagation of a sound wave is demonstrated in the animation below.
Many Physics demonstration tuning forks are mounted on a sound box. In such instances, the vibrating tuning fork, being connected to the sound box, sets the sound box into vibrational motion. In turn, the sound box, being connected to the air inside of it, sets the air inside of the sound box into vibrational motion. As the tines of the tuning fork, the structure of the sound box, and the air inside of the sound box begin vibrating at the same frequency, a louder sound is produced. In fact, the more particles that can be made to vibrate, the louder or more amplified the sound.
A 70-kg skier leaves a ski jump at a velocity of 14m/s. What is the skier's momentum at that instant?
a. 5 Nos
c. 980 Nos
b. 50 Nos
d. 9800 Nos
Answers
Answer: 980 N*s
Explanation:
A 35 kg boy is riding a 65 kg go-cart. He pushes on the gas pedal, causing the cart to accelerate at 5 m/s2. Use the equation F = m × a to find the force exerted by the go-cart’s engine.
Answers
Answer:
[tex]\boxed {\boxed {\sf 500 \ Newtons }}[/tex]
Explanation:
The equation for force is given:
[tex]F=m*a[/tex]
First, we must find the total mass, which is the sum of the boy's mass and the go-cart's mass.
total mass= boy's mass + go cart's massThe boy's mass is 35 kilograms and the go cart's is 65 kilograms.
total mass= 35 kg+ 65 kg=100 kgNow we know the total mass and the acceleration.
[tex]m= 100 \ kg \\a= 5 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]F=100 \ kg * 5 \ m/s^2[/tex]
Multiply.
[tex]F= 500 \ kg*m/s^2[/tex]
1 kilograms meter per square second is equal to 1 Newton.Our answer of 500 kg*m/s² is equal to 500 Newtons.[tex]F= 500 \ N[/tex]
The force exerted by the go cart engine is 500 Newtons.
Answer:
500 N
Explanation:
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40.
Which two of these are equivalent lengths?
1) 0.600 meters
2) 0.060 kilometers
3) 60 millimeters
4) 6000 centimeters
Answers
What name is given to the work done per coulomb of charge passing between two points
Answers
Answer:
One ampere is the current that flows when one coulomb of charge passes a point in a circuit in one second.
Volt is referred to the name given to the work done per coulomb of charge
passing between two points.
What is Volts?This is referred to as the standard unit for electric potential and electric
potential difference which was named after the Italian physicist Alessandro
Volta.
Volts can be calculated by :
Volts= Work done(Joules) / charges(coulombs)
= J/C.
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When all forces act on an object what's it called?
Answers
Answer:
Gravity
Explanation:
Define one joule heat.
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Answer:
The joule is the standard unit of energy in electronics and general scientific applications. One joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one meter. One joule is the equivalent of one watt of power radiated or dissipated for one second.
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help!!
A. 0.5 s
B. 1.0 s
C. 1.5 s
D. 2.0 s
Answers
Answer:
c. 1.5 s
Explanation:
i had this and i got it right
The north pole of one bar magnet is near the south pole of another bar
magnet. What happens to the magnets?
A. They twist away from each other.
B. They repel each other
C. They attract each other.
D. They neither attract nor repel each other.
Answers
Answer:
I think it could be C.
hope it helps!