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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You have been studying heat transfer in science class. Your task today is to make a solar oven to make s'mores: graham crackers, marshmallows, and melted chocolate. When you have successfully completed your oven, you get to eat the s'mores with the melted chocolate and soft marshmallows. How is heat energy transferred to achieve this task?
A - radiation
B - convection
C - insulation
D - conduction
The heat energy transferred to achieve this task is conduction heat transfer.
option D is the correct answer.
What is heat transfer?Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.
There are three methods of heat transfer process and they include the following;
conduction heat transferconvection heat transferradiation heat transferHeat transfer by conduction is the process of heat transfer from one particle of the medium to another with the particles being in direct contact with each other.
Heat transfer by convection occurs in fluid and involves the actual movement of the liquid molecules.
Heat transfer by radiation is a method of heat transfer that does not require material medium.
Thus, the heat transfer that allowed the oven to heat melt the chocolate is conduction heat transfer while the source of energy of the solar oven is radiation from sun.
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Answer:D is the answer
Explanation:
6
1 point
How many significant digits are in
34,000
two
five
three
four
why is the sum of the maximum voltages across each element in a series rlc circuit usually greater than the maximum applied voltage?
What is Inductor?
Similar to conductors and resistors, inductors are basic parts that serve specialized purposes in electrical devices. Inductors are typically coil-like objects encountered in electrical circuits. An insulated wire is coiled around the center core to form the coil.By briefly holding energy in an electromagnetic field and then releasing it back into the circuit, inductors are mostly used to reduce or regulate electric spikes.The majority of power electronic circuits include inductors, which are passive parts that store energy in the form of magnetic energy when electricity is supplied to them.However, A significant characteristic of an inductor is that it resists changes in the amount of current that passes through it.
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referring to your oscilloscope, which controls affect the following? a) the height of the displayed waveform b) the number of cycles displayed c) the starting point of the waveform d) the position of the waveform e) engaging the sweep generator
Referring to the oscilloscope, the height of the displayed waveform controls the effect.
Thus, the correct option is A.
What is the oscilloscope?Аn oscilloscope is а lаborаtory instrument commonly used to displаy аnd аnаlyze the wаveform of electronic signаls. In effect, the device drаws а grаph of the instаntаneous signаl voltаge аs а function of time.
The most common oscilloscope controls аre for аmplitude, frequency, triggering, аnd chаnnels. Once your teаcher hаs helped us аcquire а signаl using the correct chаnnel аnd triggering we will use the аmplitude аnd frequency controls to displаy the chаrаcteristics of the sound being produced. The аmplitude аdjustment of аn oscilloscope controls how tаll а given voltаge will аppeаr on the screen. The purpose of this аdjustment is thаt you cаn see а very lаrge or а very smаll signаl on the sаme screen.
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Under which conditions of temperature and pressure does carbon dioxide behave most like an ideal gas?.
Answer:
an ideal gas at low temperatures and high pressures.
A line that intersects two or more lines in a plane at different points is called a.
A line that intersects two or more lines in a plane at different points is called a transversal line
A transversal line, in geometry, passes through two lines in the same plane at two distinct points. Intersection caused by transversal forms several angles. These are corresponding angles, alternate interior angles, alternate exterior angles, and co-interior angles.
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does reversing the current and averaging the value compensate for the effect of earth's magnetic field?
If the current in a current is reversed in a magnetic field, the direction of the magnetic field and the conductor will also be reversed.
What is current reversal?The right-hand rule correctly describes this effect. The current follows the direction the thumb is pointing, but the direction of the magnetic field is dictated by the direction the finger is pointing. If the direction of the current changes, the direction of the magnetic field also changes. When the direction of the current is reversed, the compass needle moves in the opposite direction because the polarity of the magnetic field is reversed. The generated magnetic field is always perpendicular to the direction of the current and parallel to the electromagnets. Therefore, reversing the current will also reverse the direction of the magnetic field.
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an electron is trapped in an infinite well of width 1.31 nm. what are the three longest wavelengths permitted for the electron's de broglie waves?
If an electron is trapped in an infinite well of width 1.31 nm. The three longest wavelengths permitted for the electron's de broglie waves will be 14.39 * [tex]10^{2}[/tex] m , 5.40 * [tex]10^{2}[/tex] m and 2.88 * [tex]10^{2}[/tex] m
1st longest wavelength will be
lambda = 8 * m * [tex]L^{2}[/tex] * c / h ( [tex]n_f^{2}[/tex] - [tex]n_i^{2}[/tex])
m = mass of electron
L = width of infinite well
h = plank's constant
c = speed of light
lambda 1 = 8 * m * [tex]L^{2}[/tex] * c / h ( [tex]n_f^{2}[/tex] - [tex]n_i^{2}[/tex])
= 8 * 9.1 * [tex]10^{-31}[/tex] * 1.3 * [tex]10^{-9}[/tex] * 3 * [tex]10^{8}[/tex] / 6.626 * [tex]10^{-34}[/tex] ( [tex]2 ^{2} - 1^{2}[/tex] )
= 14.39 * [tex]10^{2}[/tex] m
lambda 2 = 8 * 9.1 * [tex]10^{-31}[/tex] * 1.3 * [tex]10^{-9}[/tex] * 3 * [tex]10^{8}[/tex] / 6.626 * [tex]10^{-34}[/tex] ( [tex]3^{2} - 1^{2}[/tex] )
= 5.40 * [tex]10^{2}[/tex] m
lambda 3 = 8 * 9.1 * [tex]10^{-31}[/tex] * 1.3 * [tex]10^{-9}[/tex] * 3 * [tex]10^{8}[/tex] / 6.626 * [tex]10^{-34}[/tex] ( [tex]4^{2} - 1^{2}[/tex] )
= 2.88 * [tex]10^{2}[/tex] m
The three longest wavelengths permitted for the electron's de Broglie waves will be 14.39 * [tex]10^{2}[/tex] m , 5.40 * [tex]10^{2}[/tex] m and 2.88 * [tex]10^{2}[/tex] m
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rank from largest to smallest the values of the magnetic field at the following distances from the axis of the conducting cylinder: ra
The stated assertion states that r> Ra lengths from the conducting cylinder's axis.
The purpose of measuring distanceWe can determine an object's actual size by learning how far it is from us. The area that an object occupies in the sky can be measured. The distance to an object is then necessary to calculate its real size. An thing appears smaller the farther it is away.
Briefing:
The magnetic force is inversely correlated with the conducting cylinder's axis distance.
The strongest magnetic field Rb = 4.95 cm,
Most minimal gravitational flux = r>Ra
Rb = 4.95 cm
r= 5.40 cm
Ra =7.75 cm
r> Ra
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When an object is in a gravitational field, it has energy in its __________ __________ energy store. What two words complete the sentence?.
When an object is in a gravitational field, then it has energy in its gravitational potential energy store.
Gravitational energy or gravitational potential energy is the potential energy that an object with mass has with respect to another object with mass due to gravity. It is the potential energy associated with the gravitational field that is released (converted into kinetic energy) as objects fall toward each other.
Gravitational energy is the potential energy that is stored in an object based on its distance from the Earth. Potential energy is one of the energies stored in an object or matter. Thus, Gravitational energy is one of the form of potential energy. The Earth, the Sun, the planets, and the stars all exert a considerable amount of gravity.
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What are some ways we can observe gravity in action in the natural world?
Answer:
well the force that holds down the sun and the force that when you throw a ball it cases it to come back to you or boomerang or poring a drink or tides or rolling objects
Explanation:
well all of those show the gravity pull sorry if it wasn't helpful
Now, assume the elevator is at rest. rank the magnitude of the forces.
a. Fi on 3
b. F1 on floor
c. F3 on 2
d. Ffloor on 1
e. F1 on 2
f. F2 on 1
g. F2 on 3
1. largest
2. smallest
The elevator is at rest. rank the of magnitude the forces F1 on floor and F floor on 1 is largest, F1 on 3 is smallest.
What is elevator?Elevator is defined as a vehicle that transports people or cargo vertically using a cable, hydraulic cylinders, or roller tracks. A platform that can be either open or closed, an elevator is used to raise and lower both people and objects to higher and lower floors.
Based on the law of motion If the elevator is accelerating, the weight of the person is larger than real gravity. So a person's weight will increase whether they are going up or down.
Thus, the elevator is at rest. rank the of magnitude the forces F1 on floor and F floor on 1 is largest, F1 on 3 is smallest.
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A rock is at the top of a 30 meter tall hill. It has a
mass of 10 kg. How much potential energy does
it have?
Answer:
Explanation:
Explanation
PE = mgh
The mass once stated, cannot be altered. You cannot decide that 1/2 down its fall, it becomes 25 kg. The mass is fixed once it has a value.
g for your intents is a constant.
h is the only thing you can change.
Givens
m = 10 kg
g = 9.81 m/s^2
h = 30 m
Solution
PE = m*g*h Substitute the givens into the equation
PE = 10 * 9.81 * 30
PE = 2943 Joules
Note a Joule is made of Kg m^2/sec^2
A net force of 265 n accelerates a bike and rider at 2. 30 m/s2. What is the mass of the bike and rider together?.
A net force of 265 n accelerates a bike and rider at 2. 30 m/s2. The mass of the bike and rider together will be 115.22 Kg
Force = mass * acceleration
mass = Force / acceleration
= 265 / 2.30
= 115.22 Kg
The mass of the bike and rider together will be 115.22 Kg
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a 23.0-turn solenoid of length 6.40 cm produces a magnetic field of magnitude 2.10 mt at its center. find the current in the solenoid.
A 23.0-turn solenoid of length 6.40 cm produces a magnetic field of magnitude 2.10 m at its center. The current in the solenoid is
B=μ[tex]*i*N/L=2.2[/tex]
so [tex]i=2.2* .062 /(31*u)=4.4*10^{-3}[/tex] / μ
[tex]I=4.4*10^(-3) /[/tex] μ
What is Solenoid?
Magnets that have a wire wrapped around an iron core are known as electromagnets. The creation of a magnetic field around the iron core depends on the presence of electric current. When the electricity is turned off, the magnetic field disappears. The magnet's wire-wrapped core is ferromagnetic or ferrimagnetic by nature. The most frequent material utilized in the core is iron.The amount of power available determines the magnetic field that is created. Power supply is not required for a permanent magnet, and the magnetic field cannot be controlled. Hard drives, relays, motors, loudspeakers, generators, MRI machines, solenoids, and other devices are all made with magnets.However, The solenoid is a particular type of electromagnet, and its function is to produce.
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a 0.5 kg meter stick on earth is supported at the 30 centimeter mark. to balance the meter stick around this point, you would need to add a 2 kg mass at what position on the meter stick?
The position on the meter stick is 25 cm.
Solution:
The center of mass of the meter stick will be at 0.5 m and its torque about the pivot point will be T1 = mg(0.5 - 0.3)
T1 = 0.5*9.81*0.2 = 0.981 N-m (clockwise)
So we have to add 2 kg mass on the left side of the pivot so that it has a counter-clockwise torque about the pivot point.
Let us position it at x the its torque about pivot point will be T2 = mg(0.3 - x) = 2*9.81*(0.3 - x)
To support the stick T1 = T2
0.981 = 2*9.81*(0.3 - x)
0.3 - x = 0.05
x = 0.25 m = 25 cm.
The position of the center of gravity is the average position of the total weight of the object. The center of mass is the object's balance point, also represented as the point where all its mass appears to reside. Sticks are measured in two ways. Measure straight from the top of the shaft to the blade or from the top of the shaft to the heel with the shaft up against a wall. Remember If you measure your street shoe stick it will feel about 3-4 inches shorter on the ice.
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a weight lifter lifts a 350-n set of weights from ground level to a position over his head, a vertical distance of 2.00 m. how much work does the weight lifter do, assuming he moves the weights at constant speed?
The work done by weight lifter is 700 J.
W = F s
Here, W = work done,
F = force, given = 350 N
s = displacement, given = 2 m
Put these values in formula, W = Fs
W = 350 × 2
W = 700 J
Therefore, the work done by weight lifter is 700 J.
Work done includes both forces exerted on the body and the total displacement of the body. This block is preceded by a constant force F. The purpose of this force is to move the body a certain distance s in a straight path in the direction of the force.
The unit of work done is joule represented by J.
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you hold a piece of wood in one hand and a piece of iron in the other. both pieces have the same volume, and you hold them fully under water at the same depth. at the moment you let go of them, which one experiences the greater buoyancy force? you hold a piece of wood in one hand and a piece of iron in the other. both pieces have the same volume, and you hold them fully under water at the same depth. at the moment you let go of them, which one experiences the greater buoyancy force? the piece of wood. they experience the same buoyancy force. the piece of iron. more information is needed.
Answer:
same
Explanation:
They both have the same volume....so they both displace an equal amount of water and thus experience the same buoyancy force
Which term is defined as "energy that moves from high to low along many pathways"?.
Energy that flows from high pathway to low pathway , is Spontaneous energy.
Energy comprises an involvement of Hess's law that describes the path of the work traced whether it be cyclic or non cyclic.[tex]\alpha +\beta -------- > g +\pi \\\\ \lim_{n \to \infty} \alpha _n decreases \\\\ \lim_{n \to \infty} \pi _n +g* increases[/tex]
In thermodynamics flow of energy decides the nature of reaction and work done.
Gibbs free energy is negative for spontaneous workGibbs free energy is positive for non spontaneous work.
[tex]H=T-US[/tex] , this is Helmholtz Free Energy. T is total energy and U is internal energy and S is entropy.
Internal energy refers to energy due to degrees of freedom.
[tex]dU=\frac{KT}{2} \\\\\int\limits^a_b {dU} \, dx=\frac{KTx}{2} \\ \\ a=low\\b=high[/tex]
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How would you describe the inner mitochondrial membrane?.
The internal mitochondrial membrane (IMM) features as a chemical and electrical insulator. It creates compartments by dividing the matrix from the cytosolic surroundings due to the fact it's miles substantially less permeable to small molecules and ions than the outer membrane.
The internal mitochondrial membrane is both an electrical insulator and a chemical barrier. sophisticated ion transporters exist to permit specific molecules to pass this barrier. There are several antiport systems embedded within the inner membrane, allowing the change of anions between the cytosol and the mitochondrial matrix.
The inner membrane is likewise loaded with proteins worried in electron delivery and ATP synthesis. This membrane surrounds the mitochondrial matrix, in which the citric acid cycle produces the electrons that tour from one protein complex to the next within the internal membrane.
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a 1.5m long dowel (a cylindrical rod) is pivoted about the end so that it is a pendulum of sorts - it can freely swing in a vertical plane. the dowel has a diameter of 2.0 cm, and its density is 3.2 g/cm3. when it is positioned in its swing such that its angle with the vertical is 22.5 degrees, what is the torque on the rod about the pivot due to its weight?
what is the meaning of life like why do we live just to die?...
Energy can be changed from one form to another. Which terms can be used to describe these changes? check all that apply. Energy conversionenergy conservationenergy correlationenergy transformationenergy transference.
The term that can be used to describe the change of energy from one form to another is called energy conversion, energy transformation.
In the field of science, energy conversion or energy transformation are the phrases that are used to express that energy can be converted from one form to another in a system.
It is due to energy conversion or energy transformation that various processes of life can occur. For example, the energy stored in food can be changed into various forms such as heat energy in order to do work.
All the processes that occur in living systems are dependent on energy conversion and energy transformation.
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while spinning down from 500.0 rpm to rest, a solid uniform disk does 5.1 kj of work. if the radius of the disk is 1.2 m, what is its mass?
The spinning down mass , to learn the mass and radius.
What is radius?
The average distance from the planet's physical center to its surface, calculated from a large number of samples, is known as the mean radius of the Earth. Approximately 6,371,000 meters are represented by the value, rearth. This translates to approximately 3,960 statute miles or 6,371 km.
What is mass?
In physics, mass is a numerical representation of inertia, which is a basic characteristic of all matter. The resistance a body of matter offers to a change in its speed or position as a result of the application of a force is what it is in essence.
Let mass of flywheel be m
Initial angular speed of flywheel=500rpm=52.36 rad/s
Mass moment of inertia of flywheel=(1/2)mr^2=0.72m
Initial rotational kimetic energy=(1/2)*0.72m*52.36^2
Work done in coming to rest = 5100J
Therefore,(1/2)*0.72m*52.36^2=5100
Therefore the mass is 5.17 kg.
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At the start of a Formula 1 race Lewis Hamilton, starting from pole position, accelerates uniformly until he reaches the first corner. His speed at the corner is 20 ms-1 and it takes him 4 s to reach this point.
(a) Calculate the acceleration of the formula 1 car. (3)
(b)Sketch (with a ruler!) a speed - time graph for the motion of Lewis Hamilton’s race car from the start of the race until it reaches the first corner.
Numerical values must be added to both axis.
The acceleration of the object is obtained as 5 [tex]m/s^{2}[/tex]
What is the acceleration?The term acceleration has to do with the rate of change of the speed of an object with time. We know that the speed is the distance that is covered per unit time by the object.
In this case, we have the following information about the motion of the object;
Initial speed of the object = 0 m/s
Final speed of the object = 20 ms-1
Time taken for the change = 4 s
We gave to use the equation;
V = u + at
v = final velocity
u = initial velocity
a = acceleration
t = time
Then we substitute the values to get;
20 = 0 + 4t
Then we make the t the subject of this formula
t = 20/4
t = 5 [tex]m/s^{2}[/tex]
The acceleration of the object can be obtained from the calculation as 5 [tex]m/s^{2}[/tex]
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Ancient Egyptians want to drag stone blocks on a sled to build a pyramid the sleds coefficient of kinetic friction is 0.800 if it takes 14,000N of force to move the sled with one block what is its mass
The mass of stone blocks on a sled to build a pyramid is 8960 kg and it needs 14400 N of force to move.
With the aid of the following formula, the maximum amount of friction force that a surface can exert on an item can be quickly determined:
Fnorm = ω *Ffrict
Fnormal = 0.8 * 14000 N
Therefore, F normal = 11200 N
The support force that is applied to an object when it comes into touch with another stable object is known as the normal force. Most of the time, the following formula can be used to easily describe the normal force:
N = mg
Here, N is the normal force we calculated above
Now, substituting the value of force normal , and gravitational acceleration = 9.8 [tex]m/s^{2}[/tex] into the equation
11520 N= m * 9.8
m = 11200/9.8
m = 8960 kg
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Venus has about the same mass as earth and is about the same distance from the sun. Yet venus does not support life. An important difference between earth and venus is that venus lacks.
An important difference between planet earth and planet venus is that venus lacks an atmosphere.
The two largest planets, Jupiter and Saturn, have nearly the same chemical composition as the Sun, with 75% of their mass made up of hydrogen and 25% of it of helium. Due to the fact that both hydrogen and helium are gases on Earth, Jupiter and Saturn are frequently referred to as gas planets. This name, though, is misleading. The gas inside Jupiter and Saturn is squeezed until the hydrogen turns into a liquid because of their size. Both planets should be referred to as liquid planets since compressed, liquefied hydrogen makes up the majority of their mass. A liquid or gaseous planet's interior is gravitationally pulled toward its heavier constituents by gravity.
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the triceps muscle in the back of the upper arm extends the forearm. this muscle in a professional boxer exerts a force of 1975 n with an effective perpendicular lever arm of 2.50 cm , producing an angular acceleration of the forearm of 115.0 rad / s2 . what is the moment of inertia of the boxer's forearm?
The moment inertia of the boxer's forearm is 0.43 kgm².
We need to know about torque to solve this problem. Torque is the rotational equivalent of linear force. It can be determined as
τ = F x r
where τ is torque, F is perpendicular force and r is radius.
Torque also depends on the moment inertia
τ = I . α
where I is inertia and α is angular acceleration.
From the question above, the given parameters are
F = 1975 N
r = 2.5 cm = 0.025 m
α = 115 rad/s²
Substitute the first equation with the second equation and we can calculate the inertia of the boxer's forearm
τ = τ
F x r = I . α
1975 . 0.025 = I . 115
I = 0.43 kgm²
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if 800 j of heat is added to a gas that does 250 j of work as a result, what is the change in the internal energy of the system?
If 800 j of heat is added to a gas that does 250 j of work as a result, The change in the internal energy of the system will be 550 J
d Q = d U + d W
Given
Q = heat added = 800 J
Work = 250 J
change in internal energy = d U = ?
d U = d Q − d W
= 800 - 250 = 550 J
The change in the internal energy of the system will be 550 J
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an object's displacement is 1.02 ft directed at 33.7° ES.
The magnitude of the horizontal component is
and the magnitude of the vertical component is
with solution if you want please
Answer:
The horizontal component is 0.77ft
The vertical component is 0.67ft
Explanation:
I have attached a quick pdf of the work required for this problem. In order to solve this problem first draw a picture.
The direction of the displacement is 33.7 degrees east of south which means that the horizontal component, x, is the displacement times the sin(33.7). Which makes the equation 1.02*sin(33.7)=x. Similarly for the vertical component, except with cosine instead of sine.
which of the following is not a general characteristic of the four jovian planets in our solar system?
This is not a characteristic of the four Jovian planets in our solar system: That they are higher in average density than the terrestrial planets.
What are the characteristics of Jovian planets?Unlike the terrestrial planets of inner solar system (Mercury, Venus, Earth, and Mars), Jovian planets do not have solid surfaces.
They are also less dense than terrestrial planets and are composed of gases. They have many moons and their mass gives them more gravitational pull. They also have rings.
Characteristics of the Jovian Planet are : They all are gaseous bodies, they have ring systems around them and also they have a large number of natural satellites.
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