Answers
-----------------
Answer:
C. DC motor
Explanation:
DC motor is an electrical machine which converts DC electrical current into mechanical energy. Generally DC motors work on the forces produced by magnetic fields. Here(in the given diagram) stater is made from the permanent magnets in which magnetic rotor rotates. The rotating magnetic field interacts with stater's permanent magnet and generate torque which rotates armature.
Related Questions
An electric field of 3 × 1016 is needed to create a spark in the air. If the charged particles in the field are separated by a distance of 1 mm, how many coulombs of charge are needed for a spark?
Answers
Answer:
There are 3.34 C of charge are needed to spark.
Explanation:
Given that,
Electric field, [tex]E=3\times 10^{16}\ N/C[/tex]
If the charged particles in the field are separated by a distance of 1 mm, d = 1 mm
The electric field is given by the formula as follows :
[tex]E=\dfrac{kq}{d^2}[/tex]
q is charge
[tex]q=\dfrac{Ed^2}{k}\\\\q=\dfrac{3\times 10^{16}\times (1\times 10^{-3})^2}{9\times 10^9}\\\\q=3.34\ C[/tex]
So, there are 3.34 C of charge are needed to spark.
Answer:
The correct answer is 3.
Explanation:
What energy transformation occurs when a skydiver first jumps from a plane?
Gravitational potential energy transforms into kinetic energy.
Gravitational potential energy transforms into thermal energy.
Kinetic energy transforms into gravitational potential energy.
Thermal energy transforms into gravitational potential energy.
Answers
Answer:
Gravitational potential energy transforms into kinetic energy.
Explanation:
It is given that, we have to write energy transformation occurs when a skydiver first jumps from a plane.
Just before jumping from the plane, the skydive exhibit only gravitational potential energy because it is possessed due to height of an object. It can be given by :
PE = m g h
m is the mass of object
g is acceleration due to gravity
h is the height form the surface
As he reaches down, its potential energy decreases continuously and it is converting to kinetic energy. It can be given by :
KE = 0.5 mv²
V is the velocity of object
So, it is clear that the gravitational potential energy si transforms to kinetic energy.
The energy transformation that occurs when a skydiver jumps from a plane is the transformation of gravitational potential energy into kinetic energy. The altitude at which the jump happens directly influences the amount of potential energy available for transformation.
Explanation:When a skydiver first jumps from a plane, the energy transformation that occurs is the conversion of gravitational potential energy into kinetic energy. As the skydiver is at a height, he/she has gravitational potential energy. Once the skydiver jumps out of the plane and begins to fall, this potential energy is transformed into kinetic energy, which is the energy of motion. The higher the altitude from which the skydiver jumps, the larger the amount of potential energy that can be transformed into kinetic energy.
Learn more about Energy Transformation here:https://brainly.com/question/32045903
Several resistors are connected in series. which of the following statements is correct? choose all that are correct.
Answers
Resistors connected in series have a total resistance greater than any individual resistor and equal to the sum of all individual resistances. Statement (b) is incorrect, as are (c) and (e), which don't apply to series circuits.
When several resistors are connected in series, the correct statements are as follows:
(a) The total series resistance is greater than the resistance of any of the individual resistors.
(d) The total series resistance is equal to the sum of the resistances of all the individual resistors.
Statement (b) is incorrect because the total resistance of a series circuit cannot be less than any individual resistor's resistance. Statement (c) is also incorrect; while the total current through the circuit is dependent on the applied voltage, the total resistance itself is not dependent on the voltage but only on the value of the resistors in series. Lastly, statement (e) describes the calculation for total resistance in a parallel circuit, not a series circuit.
A 25 µF capacitor is connected to a 12-volt battery. How much energy can be stored in the capacitor? (1F = 106 µF)
Answers
0.0000125*144=0.0018=18micro farad
Answer:
Energy stored in the capacitor is 0.0018 joules.
Explanation:
It is given that,
Capacitance of the capacitor, [tex]C=25\ \mu F=25\times 10^{-6}\ F[/tex]
Voltage of the battery, V = 12 volt
We have to find the energy stored in the capacitor. The energy stored inside the capacitor is given by :
[tex]E=\dfrac{1}{2}CV^2[/tex]
[tex]E=\dfrac{1}{2}\times 25\times 10^{-6}\ F\times (12\ V)^2[/tex]
E = 0.0018 Joules
Hence, the energy stored in the capacitor is 0.0018 Joules.
A light bulb that is connected to a 120 V source drawers 1.7 A. What is the resistance of the light bulb?
A. 14
B. 71
C. 200
D. 0.014
E. 0.0
Answers
The resistance of the light bulb is calculated using Ohm's law, which gives approximately 70.59 ohms. The closest given answer choice is B. 71 ohms.
To calculate the resistance of the light bulb that is connected to a 120 V source and draws 1.7 A, we use Ohm's law, which states that Resistance (R) is equal to Voltage (V) divided by Current (I).
R = V / I
Therefore, the resistance of the light bulb is R = 120 V / 1.7 A, which equals approximately 70.59 ohms. When checking against the provided answers, the closest value is 71 ohms. So the correct answer is B. 71.
Instruments that produce sound from a vibrating string (suspended between two nodes) are called:
Answers
The instruments that produce sound from a vibrating string suspended between two nodes are called chordophones.
What is a chordophone?A chordophone is a musical instrument that produces sound from the vibration of a stretched string. The string is typically made of metal, nylon, or gut, and it is attached to two fixed points. When the string is plucked, bowed, or struck, it vibrates and produces sound waves.
Some of the most common chordophones include: Violin, Guitar, Harp, Lute. Chordophones are a diverse group of instruments, and they come in a variety of shapes and sizes. They are played in a variety of musical genres, and they are enjoyed by people all over the world.
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why does water feel cool when it evaporates
Answers
Basically, when water evaporates, it always absorbs energy. What happens is that a molecule steals surface energy for all molecules until it is hot enough to evaporate. This is how the evaporation process happens. For this reason, the surface cools because the molecules steal the heat from the medium. This can easily be noticed when we sweat and after the water molecules evaporate from our body, it cools.
The water feels cool when it evaporates because the process of evaporation requires energy, and that energy is drawn from the surrounding environment, including our skin.
When water molecules evaporate, they transition from the liquid phase to the gas phase, escaping the surface of the water. During this phase transition, water molecules gain energy from their surroundings to overcome the intermolecular forces holding them together in the liquid. This energy absorption leads to a cooling effect on the surrounding environment.
When water evaporates from our skin, it draws heat energy from our body, which makes us feel cooler.
Overall, the cooling sensation when water evaporates is a result of energy transfer, where the water molecules gain energy from their surroundings, leading to a cooling effect on the surrounding objects or our bodies.
To know more about the evaporation:
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A sled and rider, gliding over horizontal, frictionless ice at 4.3 m/s , have a combined mass of 74 kg . the sled then slides over a rough spot in the ice, slowing down to 2.9 m/s . part a what impulse was delivered to the sled by the friction force from the rough spot?
Answers
[tex]I=F \Delta t[/tex]
where F is the intensity of the force and [tex]\Delta t[/tex] the time of application of this force.
We can rewrite the previous relationship by using Newton's second law:
[tex]F= ma[/tex]
substituting, the equation for the impulse becomes
[tex]I = m a \Delta t[/tex]
But the acceleration is the variation of the velocity in the time interval:
[tex]a= \frac{\Delta v}{\Delta t} [/tex]
so we can rewrite I as
[tex]I = m \frac{\Delta v}{\Delta t} \Delta t = m \Delta v [/tex]
the combined mass of sled and rider is m=74 kg, while the variation of velocity is
[tex]\Delta v = 2.9 m/s - 4.3 m/s = -1.4 m/s[/tex]
and so we can calculate the impulse of the friction force:
[tex]I= (74 kg)(-1.4 m/s)=-103.6 kg m/s[/tex]
where the negative sign means the friction force acts against the motion, to decelerate the system.
while i was jogging, i wad able to run 5 miles in thirty minutes. from this information, we can determine my?
A Velocity
B Acceleration
C Speed
D Direction
Answers
A disturbance that moves through a solid, liquid, gas, or a vacuum is defined as __________.
energy, as long as matter is being transported
sound, as long as matter is not present within the disturbance
a wave, as long as matter is not being transported
a wave, as long as matter is being transported
Answers
Answer:
Wave
Explanation:
It is called wave.
when the disturbance moves through solid, liquid, gas and vacuum is called non mechanical wave.
The non mechanical wave do not require medium for travel. For example, light waves. they can travel through vacuum also.
Two identical parallel plate capacitors A and B connected to a battery of V volts w/ the switch S closed. The switch is now opened and the free space between the plates of the capacitors is filled w/ a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric.
Answers
[tex]U_0 = \frac{1}{2} C_0 V^2 [/tex]
Now let's assume we fill the space between the two plates of the capacitor with a dielectric with constant k. The new capacitance of the capacitor is
[tex]C_k = k C_0[/tex]
So, the energy stored now is
[tex]U_k = \frac{1}{2}C_k V^2= \frac{1}{2}kC_0 V^2 [/tex]
Therefore, the ratio between the energies stored in the capacitor before and after the introduction of the dielectric is
[tex] \frac{U_k}{U_0}= \frac{ \frac{1}{2}kC_0 V^2 }{ \frac{1}{2} C_0 V^2}= k[/tex]
What is the most appropriate SI unit to express the speed of a cyclist in a 10-km race? km/s cm/h km/h mm/s
Answers
Km / hour would be a good choice.
The next town to where I live is 25 km away. On a good day, I can make it there in about 3/4 of an hour.
Speed = 25 km / 0.75 hour = 33.3 km/hour. That's actually a little fast most of the time. But you should understand what I mean.
A plane, diving with constant speed at an angle of 40.9° with the vertical, releases a projectile at an altitude of 654 m. the projectile hits the ground 6.70 s after release. (a) what is the speed of the plane? (b) how far does the projectile travel horizontally during its flight? what were the magnitudes of the (c) horizontal and (d) vertical components of its velocity just before striking the ground? (state your answers to (c) and (d) as positive numbers.)
Answers
A) Let's start writing the laws of motion on both x (horizontal) and y (vertical) axis. On the x-axis, it's a uniform motion with constant velocity, while on the y-axis it's an uniformly accelerated motion:
[tex]S_x(t)=v_x t[/tex]
[tex]S_y(t)=h-v_y t- \frac{1}{2} g t^2 [/tex]
where h=654 m is the initial height of the projectile, [tex]v_x[/tex] and [tex]v_y[/tex] are the initial velocities on the x- and y-axis, g=9.81 m/s^2 and t is the time. [tex]v_y[/tex] ad [tex]g[/tex] have a negative signs because they both point downward.
We can calculate the initial velocity on the y-axis by requiring that [tex]S_y(6.70 s)=0[/tex], since we know that after 6.70 s the projectile reached the ground. Therefore:
[tex]0=h-v_yt- \frac{1}{2} gt^2=654 - 6.7 v_y - \frac{1}{2} (9.81)(6.70)^2 [/tex]
from which we find
[tex]v_y=64.78 m/s[/tex]
Then we can find the magnitude of the initial velocity v using the angle with respect to the vertical [tex]\alpha=40.9^{\circ}[/tex]:
[tex]v_y = v cos \alpha[/tex]
[tex]v= \frac{v_y}{cos \alpha} =85.7 m/s[/tex]
B) Let's calculate the component of the initial velocity on the x-axis:
[tex]v_x = v sin \alpha = 85.7 m/s \cdot sin (40.9^{\circ})=56.11 m/s[/tex]
And then, we can find how far the projectile traveled horizontally by calculating Sx at t=6.70 s, when it hits the ground:
[tex]S_x(6.70 s)=v_x t = 56.11 m/s \cdot 6.7 s=375.94 m[/tex]
C) The horizontal component of the velocity does not change during the motion, since it's an uniform motion on the x-axis. Therefore, vx at t=6.7 s is the same as its initial value:
[tex]v_x (6.70 s)=v_x = 56.11 m/s[/tex]
D) Instead, vy changes during the motion since it's an accelerated motion, following the law
[tex]v_y(t) = - v_y -gt[/tex]
Using t=6.7 s, we can find the vertical velocity just before the projectile hits the ground
[tex]v_y(6.70 s)= -64.78 m/s - (9.81 m/s^2)(6.70 s)=-130.51 m/s[/tex]
Writing it with positive sign:
[tex]v_y(6.70 s) = 130.51 m/s[/tex]
what's the method for displacement in physics. I NEED HELP ASAP
Answers
V= speed or Velocity
D = displacement/ distance
T= time
Which of the following terms best describes a group of thousand galaxies?
Cluster
Constellation
Solar system
Universe
Answers
Cluster- a group of stars or galaxies forming a relatively close association.
Constellation- A group of stars that makes a shape, and has a name that is well known.
Solar system- a system of planets revolving around a center, or sun.
Universe- the whole wide range of galaxies, stars, and solar systems that were ever formed.
The best answer would be "Cluster" because the universe is infinite, they are millions of galaxies, solar systems, and constellations in it. The question only states 'a thousand galaxies'. This is of one kind. This best works for the question.
I hope this helps!
~kaikers
Answer:
A
Explanation:
It would be a cluster because that's what it is. A cluster of galaxies. a Universe is far to big. And a constellation and solar systems would be inside universes.
When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere
(1) loses electrons
(2) gains electrons
(3) loses protons
(4) gains protons
Answers
Ear wax, which is produced in the external auditory canal, contains chemicals that guard the ear from infections. TRUE OR FALSE
Answers
For Jane to see an image, light must enter her eyes. what specifically is entering her eyes when she sees an image?
A) Matter
B) Energy
C) Color
Answers
The definition of photons excludes answer A).
All electromagnetic radiation is energy. So the B) is correct answer.
Color is perceived in our eyes as a response to different wavelengths of a light. This excludes answer C).
Which type of heat source is the cleanest?
A.open fireplace
B.wood stove
C.hot water radiant heat
Answers
Answer:
option (C)
Explanation:
The source which gives the energy in form of heat is called heat source.
There are several sources which gives us heat. For example, sun, burning candle, burning coal, heater, wooden stove, etc.
Here, the cleanest source of heat energy is hot water.
a student pushes a 40-N block across the floor for a distance 0f 10 m how much work was done to move the block?
Answers
= 40N * 10m
work= 400 joules
If the floor was smooth and wet, it needed very little force.
If there was sandpaper or stones on the floor, it took a lot of force.
Whatever amount of force s/he needed to use, the work done was
Work = (amount of force, in Newtons) x (10 m)
The unit is Joules.
How can climate and temperature influence an individual’s behavior?
a.
Climate and temperature can affect an individual’s social interactions.
b.
Climate and temperature can affect an individual’s attitude toward survival.
c.
Climate and temperature affect all aspects of an individual’s behavior.
d.
Climate and temperature have no effect on an individual’s behavior.
The answer is B
Answers
Answer:
The correct answer would be b. Climate and temperature can affect an individual’s attitude toward survival.
Climate and temperature play an important role in the survival of an organism. Every organism or species requires optimum physical and chemical conditions such as temperature, pressure, pH et cetera.
Very high or very low temperature can cause death of an organism. For example, global warming has raised the temperature and salinity of the oceans due to which many marine organisms have died.
22. a = v1-v2/t equation is the equation for calculating the acceleration of an object. Write out the relationship shown in the equation, using words. (2 points) Please I will give a MEDAL !!
Answers
Why should ether be evaporated in a water bath instead of directly on a hot plate?
Answers
You are called to the crime scene immediately and you begin your investigation at 2 PM. The first thing you do is take the temperature of the body it is 84.4°F. You immediately walk over to the apartments thermostat and find that has been set at 68°F. The crime scene continues to be investigated wood samples taken and bagged. As everyone is finishing up, you take the temperature of the body again exactly 5 hours later and the temperature reads 79.6°F assume normal body temperature is 98.6°. What was the time of death? Use Newton’s Law if Cooling
Answers
As per Newton's law of cooling we know that
[tex]\frac{\Delta T}{dt} = k(T_avg - T_s)[/tex]
in 5 hours the body temperature becomes 79.6 from 84.4
while the surrounding temperature is given as 68 degree F
now from above formula
[tex]\frac{84.4 - 79.6}{5} = k (\frac{84.4 + 79.6}{2} - 68)[/tex]
[tex]0.96 = k(14)[/tex]
now let say the person died "t" time ago
now we will have
[tex]\frac{98.6 - 84.4}{t} = k (\frac{98.6 + 84.4}{2} - 68)[/tex]
[tex]\frac{14.2}{t} = k(23.5)[/tex]
[tex]\frac{14.2}{t} = \frac{0.96}{14}(23.5)[/tex]
[tex]t = 8.8 hours = 9hours (approx)[/tex]
so he died at approx 5 Am in morning
alcohol use for can cause feel alcohol syndrome in the unborn fetus? true or false
Answers
Answer:
True
Explanation:
The distance light travels in a year is called _______.
a light year
a parsec
a megameter
an astronomical unit
Answers
the answer is a, a light year. Hope this helped!
Compare the magnitude of the electromagnetic and gravitational force between two electrons separated by a distance of 2.00 m. Assume the electrons have a mass of 9.11 × 10^–31 kg and a charge of 1.61 × 10^–19 C. Round to two decimal places.
Fe = _____ × 10^–29 N
Fg = _____ × 10^–71 N
Fe/ Fg= _____ × 10^42
Please answer as soon as possible!
Answers
Answer:
1. 5.83
2. 1.38
3. 4.22
Explanation:
Final answer:
The electromagnetic force between two electrons 2.00 m apart is 2.30 x 10−29 N, and the gravitational force between them is 5.54 x 10−71 N. The ratio of these forces is approximately 4.15 x 10−42.
Explanation:
To compare the magnitude of the electromagnetic and gravitational forces between two electrons separated by a distance of 2.00 m, we can use Coulomb's Law for the electromagnetic force (Fe) and Newton's Law of Universal Gravitation for the gravitational force (Fg).
The formula for Coulomb's Law is Fe = k |q1q2| / r2, where k is Coulomb's constant (8.99 x 109 N m2/C2), q1 and q2 are the charges of the electrons (1.61 x 10−19 C), and r is the separation distance (2.00 m).
The gravitational force is given by Newton's Law of Universal Gravitation, which is Fg = G m1m2 / r2, where G is the gravitational constant (6.67 x 10−11 N m2/kg2), and m1 and m2 are the masses of the electrons (9.11 x 10−31 kg).
After calculating these values, we get:
Fe = 2.30 x 10−29 NFg = 5.54 x 10−71 N
To find the ratio Fe/Fg, we divide the electromagnetic force by the gravitational force, resulting in:
Fe/Fg = 4.15 x 1042.
The following diagram shows resistors in ___ and is ____ of the arrangement of circuit elements in homes.
1.
A. series
B. parallel
2.
A. typical
B. not typical
file:///S:/AOP.COM.Science.0900.2015/IntegratedPhysicsandChemistry2015/12/circuit_ex_6.jpg
Answers
Electrical things in parallel are typical of circuit elements in homes.
Electrical things in series are not typical of circuit elements in homes.
Every electrical thing in a house is in parallel. Sometimes they're also in parallel with the electrical devices in other houses nearby.
not a 100% sure if that correct i hope so mark me the brainiest if its right please :)
A buoy is anchored to the ocean floor. A large wave approaches the buoy. How will the buoy move as the wave goes by?
Answers
The buoy will be moved by the force exerted on it by the waves.
Explanation
As the buoy is anchored to the ocean floor, the buoy will be floating in the ocean floor.
When the large wave approaches, it will act as an external unbalanced force on the buoy.
The waves will consist of crest and trough.
The crest region have higher force. So the crest will first interact with the buoy and the external force of crest will make the buoy to float upward along with the motion of crest.
Then the trough region will lessen the force and thus it will again come back in its original position.
Which energy transformation is represented in the diagram?
A nuclear to thermal and radiant
B nuclear to electrical and chemical
C Chemical to nuclear and radiant
D Chemical to electrical and nuclear
Answers
Answer:
A nuclear to thermal and radiant
Explanation:
Nuclear fission is the disintegration of the force that holds the nucleus of the atom together, creating two different but lighter nuclei.
In nuclear fission, it seeks to break the force of attraction or nuclear force that joins the protons and neutrons that form the nucleus of an atom. Neutrons without electric charge are used against the nucleus of the atom to produce enough excitation energy to deform the nucleus into two halves.
The nuclei obtained from nuclear fission are different and lighter than the initial nucleus. The excess energy that emerges from nuclear fission is what is known as nuclear energy.
Nuclear fission produces energy in the form of heat and other radiations releasing (ie thermal and radiation in general), in turn, other neutrons. Each generated neutron collides with the other nuclei created, producing a chain reaction.
Nuclear fission can be used for power generation through a nuclear reactor. A nuclear reactor is a facility that generates self-sustained and controlled nuclear reactions, and uses the energy released from the fission of atoms.
For example, one of the first applications of nuclear fissions used uranium atoms to produce electricity.