Final answer:
Another term for a Lewis structure diagram is an 'electron-dot diagram,' which represents the valence electrons of an atom as dots around the element's symbol and is used to visualize the bonding and non-bonding electrons in molecules.
Explanation:
Another term for a Lewis structure diagram is an electron-dot diagram. A Lewis structure diagram is a representation that shows the valence electrons of an atom as dots around the symbol of the element. The dots represent the number of valence electrons present in the atom and are arranged around the chemical symbol in a specific manner with a maximum of two dots on one side. For instance, the Lewis diagram for hydrogen would consist of the symbol 'H' with one dot next to it, representing its single valence electron.
The Lewis diagram is also referred to as a Lewis dot diagram and is used to visualize the bonding between atoms as well as non-bonding valence electrons. When atoms bond, the shared electrons are represented by lines, and lone pairs are depicted by dots surrounding the atoms. These diagrams help in predicting the shape of molecules and the arrangement of atoms.
You wish to lift a 400 lb car engine a vertical distance of 3 ft using a strong rope. Unfortunately, your hand crank winch can only generate 100 lb of tension in your rope. In order to overcome this obstacle, you use a multiple pulley system (block and tackle) to lift the engine.
What is the mechanical advantage of this system?
Answer:
Explanation:
Mechanical Advantage = Outputforce / inputForce
outputforce = 400 X 3 = 1200
Mechanical Advantage = 1200 / 100
MA = 12
Which statement correctly compares sound and Electromagnetic waves?
A. Both EM and sound waves need matter to carry energy from one place to another.
B. Neither EM nor sound waves need matter to carry energy from one place to another.
C. EM waves carry energy parallel to the motion of the wave, while sound waves carry energy perpendicular to it
D. Sound waves carry energy parallel to the motion of the wave, while EM waves carry energy perpendicular to it.
Answer: D
D. Sound waves carry energy parallel to the motion of the wave, while EM waves carry energy perpendicular to it.
Explanation:
Sound is a longitudinal wave in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of propagation of the wave
While electromagnetic wave are transverse wave. A moving wave whose oscillations are perpendicular to the direction of the wave or path of propagation. So the correct answer is D. Sound waves carry energy parallel to the motion of the wave, while EM waves carry energy perpendicular to it
The heat that builds up in the greenhouse effect initially enters the atmosphere as
Answer:
Solar radiation
Explanation:
Gases such as methane , ozone, and Carbon dioxide are known as the greenhouse gases. When the gases are heated up they usually build up in the greenhouse effect and after a while they enter the atmosphere as solar radiation.
It is important to note that the release of the gases is usually the first(initial) release of the gases into the atmosphere.
Answer:
infrared radiation within the sun's radiation.
Explanation:
The solar radiation that gets to earth contains about 3 electromagnetic waves which includes visible rays, infrared rays, ultraviolet rays. Infrared rays carries heat through space and is the part of the solar radiation that carries heat into the earth's atmosphere.
A student is using a frequency generator set to 440 Hz. Another student has an identical generator playing an unknown frequency. When both sounds are playing, the student hears a 'beat' with a frequency of 2Hz. What would the unknown frequency be
Answer:
The unknown frequency is either 438 Hz or 442 Hz.
Explanation:
The frequency of a beat heard when two sounds with frequencies f₁ and f₂, are played simultaneously, is simply the difference between two frequencies.
b = |f₁ - f₂|
b = 2 Hz
f₁ = 440 Hz
f₂ = ?
440 - f₂ = 2 or 440 - f₂ = -2
f₂ = 438 Hz or 442 Hz
The unknown frequency is either 438 Hz or 442 Hz.
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What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?
Answer:
Explanation:
We want to know the percentage of the radio active element after 7half life
Let assume the original mass or quantity of the radioactive element is No
After first half life it remains No/2
Second half life No/4
Third half life No/8
Fourth half life No/16
Fifth half life No/32
Sixth half life No/64
Seventh half life No/128
So after the seventh half life the radioactive element has decay to No/128
Then, the that remain is
The remaining amount / Original amount × 100
%remain = (No/128 / No) × 100
No cancel No
%remain = 100/128
%remain = 0.78%
A wrench 0.500m long is applied to a nut with a force of 80.0N. Because of the cramped space, the force must be exerted upward and at an angle of 60.0 degrees, with respect to a line from the bolt through the end of the wrench. How much torque is applied to the nut
Answer:
The torque applied to the nut is 34.6 N-m.
Explanation:
Given that,
Length of the wrench, l = 0.5 m
Force applied by the wrench, F = 80 N
The force must be exerted upward and at an angle of 60.0 degrees, with respect to a line from the bolt through the end of the wrench.
Torque applied to the nut is given by :
[tex]\tau=Fr\ \sin\theta\\\tau=80\times 0.5\ \sin(60)\\\tau=34.6\ N.m[/tex]
So, the torque applied to the nut is 34.6 N-m.
What is the gravitational force between a 45 kg person, and the Earth at 5.98 x 1024 kg, with a distance of
6.38 x 106 m?
Object 1 (m1): 45 kg person
Object 2 (m2): 5.98 x 1024 kg Earth
Distance: (r): 6.38 x 106 meters
A. 227 N
B. 398 N
C. 441 N
D. 510 N
Answer:
C. 441 N
Explanation:
Gravitational force between two objects can by calculated by the formula
= G m₁m₂ / r² , m₁ and m₂ are masses at distance r
= ( 6.67 x 10⁻¹¹ x 45 x 5.98 x 10²⁴) / ( 6.38 x 10⁶ )²
= 44.09 x 10
= 440.9 N
= 441 N .
You illuminate a slit with a width of 0.0537 mm with a light of wavelength 719 nm and observe the resulting diffraction pattern on a screen that is situated 2.77 m from the slit. What is the width, in centimeters, of the pattern's central maximum?
Answer:
Width of central maximum will be [tex]7.423\times 10^{-12}m[/tex]
Explanation:
We have given width of the slit [tex]D =0.0537mm=5.37\times 10^{-5}m[/tex]
Wavelength of light [tex]\lambda =719nm=719\times 10^{-9}m[/tex]
Distance of screen from slit D = 2.77 m
Angle to first minimum [tex]sin\Theta =\frac{\lambda }{d}=\frac{719\times 10^{-19}}{0.0537\times 10^{-3}}=1.34\times 10^{-12}[/tex]
So width of the central maximum
w= [tex]2y=2\times Dsin\Theta =2\times 2.77\times 1.34\times 10^{-12}=7.423\times 10^{-12}m[/tex]
So width of central maximum will be [tex]7.423\times 10^{-12}m[/tex]
Select to show the energy of pendulum 1. Be sure that friction is set to none. Drag the pendulum to an angle (with respect to the vertical) of 30∘, and then release it. When the pendulum is at −30∘, what form(s) of energy does it have? Check all that apply. Check all that apply. Potential energy Kinetic energy Thermal energy
Answer:
The pendulum only has potential energy.
Explanation:
A pendulum is a weight that is tied to a rope and is also suspended with a pivot and that can swing freely. Said pendulum moves at an angle of 30 degrees. Then he is released. The pendulum moves with a constant amplitude. In this way, it reaches the maximum amplitude when its angle is 30 degrees. The angles mentioned in the exercise are the extremes. At each point, the total energy is conserved. Total energy is defined as the sum of the kinetic energies plus the potential energy. The kinetic energy of the pendulum is equal to zero in the extreme positions, therefore, only the total energy is equal to the potential energy.
Final answer:
At −30°, a pendulum has both potential and kinetic energy, with energy conversion governed by the conservation of mechanical energy.
Explanation:
When a pendulum is at an angle of −30°, it possesses both potential energy and kinetic energy. Potential energy is due to its height above the lowest point of the swing and kinetic energy due to its motion. In the absence of friction, no thermal energy is produced.
Using conservation of mechanical energy, we know that as the pendulum swings towards −30°, some of the potential energy is converted into kinetic energy. At the highest points in its swing (±30°), the pendulum has maximum potential energy and zero kinetic energy. When it passes through the vertical, it has maximum kinetic energy and minimum potential energy. At −30°, the pendulum is on its upward swing, thus it starts regaining potential energy and losing kinetic energy.
help please :) 15 points.
A compass always points to Earth’s true North Pole because the north pole of the magnet in the compass is attract to Earth’s ________ magnetic pole.
Answer:
south
Explanation:
What happens to a light wave when it travels from air into glass?
A ball is pushed from a stop and rolls 6 m in 2 s. Student A says the average speed of the ball is 3 m/s. Student B says the average speed of the ball is 1.5 m/s2. Which student is correct? Explain your answer.
Answer:
Student A is correct
Explanation:
This is because by student A's recording, we get the average speed = total distance/total time = 6 m/2 s = 3 m/s. Student B recorded an average speed of 1.5 m/s². This cannot be correct because it is in the unit of acceleration.
Student A is correct; the average speed of the ball is 3 m/s. Student B's 1.5 m/s² refers to acceleration, not speed.
The average speed of an object is calculated by dividing the total distance traveled by the total time taken.
In this case, the ball rolls 6 meters in 2 seconds.
Average Speed Calculation
Total distance traveled: 6 metersTotal time taken: 2 secondsAverage speed = Total distance / Total time = 6 meters / 2 seconds = 3 m/sStudent A is correct. The average speed of the ball is 3 m/s. Student B's statement about 1.5 m/s² is incorrect because it refers to acceleration, not speed.
What is referred to as reflectivity of surfaces?
Answer:
Reflectance of the surface of a material is its effectiveness in reflecting radiant energy.
Explanation:
It is the fraction of incident electromagnetic power that is reflected at an interface. The reflectance spectrum or spectral reflectance curve is the plot of the reflectance as a function of wavelength.
If the speed of an object doubles, its kinetic energy
Technician A says that a waste spark ignition system fires two spark plugs at the same time. Technician B says that the waste spark ignition system uses ignition coils connected to companion cylinders. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both technicians A and B
d. Neither technician A nor B
Neither technician A nor B. No technician is correct.
What is waste spark Ignition?Two spark plugs are connected to the ends of one coil in a waste spark ignition system (for a two-cylinder engine) ( for 4 cylinder engine two coils are used, each driving two spark plugs ).
As a result, both spark plugs will light up simultaneously. The first (A) cylinder's compression stroke will ignite one spark plug, while the opposing cylinder's exhaust stroke will fire the second ( wasted ). Cylinder "A" will fire during the exhaust stroke when it is time for cylinder "B" to fire during compression.
Due of the opposing current flow, both spark plugs burn simultaneously from the ends of just one coil. The spark "flows" in this manner from the center to the exterior.
Therefore, Neither technician A nor B. No technician is correct.
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Final answer:
Both Technician A and Technician B are correct; the waste spark ignition system fires two spark plugs at the same time and uses ignition coils connected to companion cylinders. So the correct option is c.
Explanation:
The subject of this question is the waste spark ignition system which is used in internal combustion engines. When evaluating the statements made by Technician A and Technician B, we find that Technician A says that a waste spark ignition system fires two spark plugs at the same time. This is correct as in a waste spark system, each ignition coil fires two plugs simultaneously - one on the compression stroke and the other on the exhaust stroke (which is the 'waste' spark). Technician B says that the system uses ignition coils connected to companion cylinders. This is also correct, as the coils are connected to two cylinders that are at the top dead center at the same time, one on the power stroke, and the other on the exhaust stroke.
Therefore, the answer is:
c. Both technicians A and B
Choose the statement that is a misconception about a system in chemical equilibrium.
The rate of the forward reaction is equal to the rate of the backward reaction.
The concentrations of the products and reactants don't change.
There are equal parts reactants and products.
Reactions continue to happen in both directions.
Answer:
There are equal parts reactants and products.
Explanation:
When a system is in a chemical equilibrium, the rate at which the forward reaction occur is the same as the rate at which the reverse reaction occurs. This system is said to undergo a reversible reaction. The concentration of the reactants and products do not change, i.e are constant.
In a chemical equilibrium, the reaction continues in both directions but at the same rate.
Therefore the statement that is a misconception about a system in chemical equilibrium is 'There are equal parts reactants and products'.
Answer:
C
Explanation:
i just took the quiz and went over my answers its C
A block of mass 500 g is attached to a horizontal spring, whose force constant is 25.0 N/m . The block is undergoing simple harmonic motion with an amplitude of 6.00 cm . At t=0 the block is 4.00 cm to the left of its equilibrium position and is moving to the right. At what time t1 will it first reach the limit of its motion to the right?
Answer:
t = 0.325343 sec
Explanation:
given
mass of block(m) = 500 g
force constant (k) = 25.0 N/m
we know simple harmonic motion equation as
y = A sin (ωt + Φ)
where Φ = [tex]sin^{-1} (-4/6)[/tex]
so we get
Φ = - 0.729727656 rad
and we know
[tex]\omega = \sqrt{\frac{k}{m}[/tex]
[tex]y = A sin (t\sqrt\frac{k}{m} - 0.729727656)[/tex]
now substitute the values we get as
y = 0.06 m
[tex]0.06 = 0.06 sin (t\sqrt(\frac{25}{0.5}) - 0.729727656)[/tex]
[tex](t\frac{25}{0.5} - 0.729727656) = \frac{\pi}{2}[/tex]
on solving these equation we get
t = 0.325343 sec
The time where t1 will it first reach the limit of its motion to the right is 0.325343 sec.
Calculation of the time taken:Since
mass of block(m) = 500 g
force constant (k) = 25.0 N/m
Here we apply the harmonic motion equation i.e.
y = A sin (ωt + Φ)
where Φ = sin^-(-4/6)
Φ = - 0.729727656 rad
Now
w = √k/m
y = Asin (t√k/m - 0.729727656)
y = 0.06m
Now
(t2.5/0.5 - 0.729727656) = π/2
t = 0.325343 sec
Hence, The time where t1 will it first reach the limit of its motion to the right is 0.325343 sec.
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Person a pushes a box on wheeled to the left with a force of 10,000 Newton's .Person b and friction from the floor exerts a net force of 9,990n force to the right how does the box move and why
The box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.
Explanation:
So in the present problem, three forces are acting on the box. The force exerted by Person A on the box is represented as F₁ and it is given as 10000 N. Similarly, the net force exerted by Person B and friction on the box is given as 9990 N and it is represented as F₂. Since, F₁ is acting toward left side and F₂ is acting toward right side, both the force will be acting opposite to each other. Then the net force of all the three force acting on it will be the difference between F₁ and F₂ and the box will move towards the direction of maximum force.
[tex]Net force = 10000-9990 = 10 N[/tex]
Thus, the magnitude of the net force acting on the box will be 10 N and as the force exerted by Person A on the box is greater than the combined force of Person B and friction, the box will move towards left side as exerted by Person A.
So the box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.
As the solar nebula contracts during the formation of the solar system, it Group of answer choices forms a black hole. flattens out into the ecliptic plane and spins faster due to conservation of angular momentum. reverses its direction of rotation. loses angular momentum.
During the formation of the solar system, the solar nebula contracts, spins faster due to conservation of angular momentum and flattens out into the ecliptic plane. This process doesn't result in a black hole formation or loss of angular momentum.
Explanation:In the formation of the solar system, the solar nebula contracts and, due to the conservation of angular momentum, it starts to spin faster. As it continues to contract, it begins to flatten out into what we call the ecliptic plane, an imaginary plane that passes through all the planets orbits.
This movement and transformation do not lead to the formation of a black hole or necessarily result in the loss of angular momentum. Rather, the nebula maintains its angular momentum, as per the law of conservation, and this aids in speeding up the rotation as the nebula gets smaller. This is very similar to what happens when a figure skater pulls their arms in while spinning, they go faster but their angular momentum remains constant.
These processes—gravity-induced contraction, increase in rotation speed, and flattening into the ecliptic plane—are integral steps in our understanding of how our solar system came into existence.
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During the formation of the solar system, the solar nebula contracts, flattens into the ecliptic plane and spins faster. This is due to the conservation of angular momentum. The material is concentrated in the center, forming a star, with the remaining materials eventually becoming planets and moons.
Explanation:As the solar nebula contracts during the formation of the solar system, it flattens out into the ecliptic plane and spins faster due to conservation of angular momentum. This process starts when a large cloud of gas and dust, which originally had rotational energy, begins to contract under its own gravity. The natural motion and turbulence of the material lead to an initial spinning motion.
As the nebula shrinks, the rotation causes it to flatten into a disk-like shape. This can be compared to a figure skater spinning more rapidly by bringing her arms in closer to her body, which minimizes her rotational radius and conserves angular momentum. Similarly, as the nebula contracts and its rotational radius decreases, it spins faster.
A majority of the matter becomes concentrated in the hot center, eventually leading to the formation of a star. The remainder of the material, consisting of solid particles which condense as the nebula cools, forms the planetesimals - the building blocks of the planets and moons.
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A ray diagram is shown.
Which letter represents the location of the image produced by the lens?
W
X
Y
Z
Answer:
Z
Explanation:
The purple and yellow rays from the same point on the object are shown converging at point Z, where the image will be.
Answer:
Z
Explanation:
got it right on edge
What is mechanical energy?
Answer:
In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the energy associated with the motion and position of an object.
Explanation:
Answer:
Mechanical Energy is Kinetic energy + the Potential Energy.
Explanation:
ME=KE+PE
A soccer player kicks a ball, changing its momentum by 11 kg. M/s, The net force on the ball is 910 N. How long does the soccer player maintain contact with the ball?
the soccer player maintains contact with the ball for approximately 0.0121 seconds.
We can use the impulse-momentum theorem to solve this problem. The impulse-momentum theorem states that the change in momentum of an object is equal to the impulse applied to it. Impulse [tex](\( J \))[/tex] is the product of force[tex](\( F \)) and time (\( \Delta t \)).[/tex]
[tex]\[ J = F \times \Delta t \][/tex]
Given:
- Change in momentum[tex](\( \Delta p \))[/tex]= 11 kg·m/s
- Net force[tex](\( F \))[/tex] = 910 N
Using the formula for impulse, we can rearrange it to solve for time[tex](\( \Delta t \)):[/tex]
[tex]\[ \Delta t = \frac{\Delta p}{F} \][/tex]
Substitute the given values:
[tex]\[ \Delta t = \frac{11 \, \text{kg·m/s}}{910 \, \text{N}} \]\[ \Delta t = \frac{11}{910} \, \text{s} \]\[ \Delta t \approx 0.0121 \, \text{s} \][/tex]
Therefore, the soccer player maintains contact with the ball for approximately 0.0121 seconds.
What is occurring when two waves traveling along the same medium meet and cancel each other out?
Answer:
Destructive interference
Explanation:
Destructive interference occurs when waves come together in such a way that they completely cancel each other out. When two waves interfere destructively, they must have the same amplitude in opposite directions.
Answer:
Destructive interference
Explanation:
Destructive interference occurs when waves come together in such a way that they completely cancel each other out. When two waves interfere destructively, they must have the same amplitude in opposite directions.
im also taking the quiz now
Use the drop-down menus to complete each statement about tornado safety
Answer:
Can we please have the options for the drop down menu
Explanation:
Answer:
Before a tornado warning occurs, you should Have a disaster plan ready
If you’re indoors during a tornado, you should go to the basement
If you’re outdoors during a tornado, you should lie in a ditch or low-lying ditch
An object is placed at a known distance in front of a mirror whose focal length is also known. You apply the mirror equation and find that the image distance is a negative number. This result tells you that __________
Answer:
the image is behind the mirror, so the image is virtual and upright.
Explanation:
What instrument can you use to measure the circumference of your waist?
Answer:
waist circumference
Explanation:
Autorhythmic cells can generate action potentials spontaneously because they have Autorhythmic cells can generate action potentials spontaneously because they have channels for Na+ and K+ that are always open. L-type Ca2+ channels. a net influx of Na+. unstable membrane potentials. prolonged Ca2+ influx.
Answer:
Because of unstable membrane potentials
Explanation:
Autorhythmic cells are specialized cardiac muscle cells in the heart from which electrical impulses called action potentials originate. These cells can generate electrical impulses without any external simulations by the nerve cells. I.e. they are self – excitable.
Autorhythmic cells spontaneously create action potentials because they have an unstable resting or membrane potentials that continuously depolarizes, drifting slowly toward threshold. As sodium ions enter the cell, the inner surface of the plasma membrane gradually becomes less negative, generating the pacemaker potential.
Though their is an influx of sodium ions into the cell, the basic reason for the spontaneous generation of action potentials solely because of unstable membrane potentials. and not majorly due to the influx of sodium ion.
Autorhythmic cells can generate action potentials spontaneously due to the presence of L-type Ca2+ channels.
Explanation:Autorhythmic cells are a type of specialized cells found in the heart. Unlike regular cardiac muscle cells, autorhythmic cells can generate action potentials spontaneously without external stimuli. This is due to the presence of L-type Ca2+ channels.
These channels allow the entry of calcium ions, which triggers the depolarization phase of the action potential. The influx of calcium ions leads to the opening of voltage-gated potassium channels and closure of calcium channels, helping restore the resting membrane potential.
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The gap between electrodes in a spark plug is 0.060 cm. Producing an electric spark in a gasoline-air mixture requires an electric field of 3.0 × 106 V/m. What minimum potential difference must be supplied by the ignition circuit to start a car?
The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V
Explanation:
Given data,
E= 3 ×10 ⁶ Δx=0.06/100
We have to find the minimum potential difference
E= -ΔV/Δx
ΔV=- E × Δx
ΔV =-3 ×10 ⁶ . 0.06/100
ΔV=-1800 V
The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V
Answer:
I can confirm that is the answer
Explanation:
I did the question
Why are the arms of spiral galaxies typically blue in color?
Answer:
Stars are forming in the spiral arms so there are high mass, hot, blue stars in the arms.
Explanation:
What force would be required to accelerate a 1,100kg car to 0.5 m/s2
Answer:
the force required to accelerate a 1,100kg car is 550N