Correct
Lithium fluoride is created due to the increased stability in the completion of fluorine's outer shell. By moving one electron from lithium, its outer shell is now full (with two). Additionally, by adding this electron to fluorine, it gains a full, stable octet.
The formation of lithium fluoride (seen here) is due to the increased stability in the completion of fluorine's outer shell, therefore the correct answer is option B.
What is the octet rule?The octet rule is the rule that explains that an atom should have filled with eight electrons in its valence shell for the most stable state.
For example, an Oxygen atom that has six electrons in the outermost shell needs two more electrons in its valence shell to form a stable atom.
In the formation of the lithium fluoride the lithium atom which has an extra electron in its outermost shell transfer it to the fluorine atom which has one less electron in its outermost shell so that it can compete with its octet.
The bond formed between the lithium and the fluorine atoms in the lithium fluoride is of an ionic nature where one electropositive and one electronegative atom are involved and the bond is formed by the transfer of the electron.
thus, The formation of lithium fluoride is because of the increased stability in the completion of fluorine's outer shell, therefore the correct answer is option B.
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What happens to your weight on Earth when your mass increases? It stays constant. It also increases. It decreases.
When your mass increases your weight on earth also increases
2- it also increases
When a person's mass increases on Earth, their weight also increases since weight is the gravitational force acting on mass. Mass does not change with location, while weight can vary with gravity's strength. An astronaut's mass is constant, but their weight decreases on the Moon due to lower gravity.
The relationship between mass and weight is a fundamental concept in physics. When your mass on Earth increases, your weight also increases. This is because weight is the force of gravity acting on an object's mass. Since gravity on Earth is essentially constant, an increase in mass results in a directly proportional increase in weight.
It is essential to understand that while mass is a measure of the quantity of matter in an object and does not change with location, weight is the gravitational force exerted on that mass and can vary with the strength of the gravitational field. On Earth, the acceleration due to gravity is approximately 9.80 m/s².
An example to illustrate this is comparing your weight on Earth to that on the Moon. If an astronaut traveled from Earth to the Moon, their mass would remain the same but their weight would decrease because the Moon's gravitational acceleration is only about one-sixth that of Earth's (1.67 m/s² compared to 9.80 m/s²).
how to solve for average speed
The Average speed can be found by dividing the total traveled by the amount of time it took to travel that distance.
For example, if it took you 10 hours to travel 100 miles, your average speed is the amount of miles you traveled in 1 hour. Simplify.
100/10 = 10/1
Your average speed is 10 miles per hour.
~
a car moving 60km/hr in one hour will travel.
Given that
Speed = 60 Km/hr
In one hour, how much distance travelled by car
We know that
Distance = Speed × time
S = 60 × 1
S = 60 Km
In one hour car will travel 60 Km
Ethan made a diagram to compare examples of the first and second laws of thermodynamics. What belongs in the areas marked X and Y?
First law of thermodynamics:
It states that "Energy neither be created nor it can be destroyed". simply it converts one form of energy into another form. It is also known as "law of conservation of energy"Limitations of First law
It doesn't provide a clear idea about the direction of transfer of heat.It doesn't provide the information that how much heat energy converted inti work.Its not given any practical applications.II law of thermodynamics:
It states that "the total entropy of the system can never decrease over time"
It is strongly proved by two laws, they are
1. Kelvin-plank statement:
He stated that "any engine does not give 100% efficiency". It violates the Perpetual motion of machine II kind(PMM-II).
2. Classius statement:
It states that "Heat always flows from high temperature body to low temperature body, without aid of external energy".
Also it stated that " Heat can also be transferred from low temperature body to high temperature body, by the aid of an external energy".
Applications of II law:
Refrigeration &Air conditioning, Heat transfer, I.C. engines, etc.
Answer:
The answer is D.
Explanation:
I just took the quiz.
Im stressing out about this cause obviously i thought i did good but i guess not can someone explain to me where i went wrong this is her feedback
Comments: Mia,
I am happy to see you are jumping right into the course. You are correct that physics and Newton's laws of motion are important to swimming. You are off to a good start, but you have not mastered the 3 laws of motion, yet. I would like you review the definitions and examples in the lesson and to then download the worksheet and complete the questions directly on the sheet. It will guide you to write in Newton's 3 Laws of motion and provide examples. If you need any help please reach out to me. With some more hard work, I know you can do this. I am excited to see what your resubmit.
I would recommend, to include the scientific part of Newton's Laws of motion, with an example. Also, state how all three laws play a part in the activity. It seems like you just did the realistic part of it, swimming, now include how it happens with correct vocabulary. Good Luck!
What do chefs change with many dishes they serve
Chefs may adjust their recipes to enhance the taste and presentation of dishes using various techniques and ingredients, drawing upon their knowledge of food science and nutrition to make each meal appealing to both the eye and palate.
Chefs often modify the dishes they serve to enhance the taste, texture, and presentation. They might use various techniques and ingredients, such as gels, chemicals, and other substances to modify liquids or to transform the food experience, as seen in molecular gastronomy. Expert chefs combine their knowledge of food science, nutrition, and diet to create meals that are as visually appealing as they are delicious. Additionally, chefs are known to make adjustments on the fly, such as adding a little salt to a soup after tasting or altering recipes to suit specific dietary needs or preferences. This adaptability and attention to detail are part of what makes a chef proficient in the culinary arts.
define commercial unit of energy
The commercial unit of energy is given as kWh or kilo-watt-hour.
It is defined as the work done at a rate of 1000 Watt in a time of one hour.
there are other units of energy also like joules, calories but they are not big enough to express large quantity of energy. that is why we use kWh as the commercial unit since it is bigger compared to other energy units.
A 70.0 kg skydiver falls towards the earth. The force due to air resistance is 1200 N. What is the acceleration of the skydiver?
The force of gravity on the skydiver is
F(g) = (mass) x (gravity)
F(g) = (70 kg) x (9.8 m/s²)
F(g) = 686 Newtons, downward (her "weight")
If, through some mysterious process, the force due to air resistance acting on her is 1,200 Newtons upward, then the net force on the skydiver is
F(net) = (686 N down) + (1,200 N up)
F(net) = 514 Newtons, up
The skydiver is accelerating UP, at 7.34 m/s² .
I have no idea how this could actually happen in the real world, but the Math and Physics are bullet-proof here.
Final answer:
The acceleration of the skydiver is approximately 17.14 m/s².
Explanation:
The acceleration of the skydiver can be found using Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration.
Given that the force due to air resistance is 1200 N and the mass of the skydiver is 70.0 kg, we can set up the equation:
Net force = Force due to air resistance
70.0 kg * acceleration = 1200 N
Solving for acceleration:
acceleration = 1200 N / 70.0 kg
acceleration ≈ 17.14 m/s²
Therefore, the acceleration of the skydiver is approximately 17.14 m/s².
A street ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/so what is its momentum
Given that
mass of ball ( m) = 2 Kg,
velocity (v) = 2.8 m/s ,
Momentum of ball = ?
We know that "Momentum is simply means, mass in motion
Mathematically,
momentum (p) = m.v
= 2× 2.8
= 5.6 Kg.m/s
=
Eric, Sheena, and Yael are playing a game. Eric has half as many points as Sheena. Sheena has two fewer points than Yael. Together, the three players have 52 points. How many points does Yael have?
Show the work plssss... Thank you
Lets say that:
Eric is E
Sheena is S
Yael is Y
We know that S+2=Y, E= 1/S and that E+S+Y=52. So, we can insert S+2=Y and E= 1/S into our other equation, which would bring us to (1/2S)+(S+2)+S=52. This is equal to 1/2S+S+2+S=52. We then use algebra to get the answer:
Given:
S+2=Y
E=1/S
E+Y+S=52
Equation:
1/2S+S+2+S=52
1/2S+S+S=52
2.5S=50
S=50/2.5
S=20
And since Yael has 2 more points then Yael then we do 20+2 and get 22.
Hope this helps! <3
Which simple machine is the lid of a jar? a lever a screw an inclined plane a wheel and axle
The answer is a screw.
If you look up screws you can see they work the exact same!
A disturbance sends ripples across water in a tub.
What are these ripples called?
surface waves
longitudinal waves
rarefactions
compressions
I believe it is surface waves because it happens at the surface of the water.
Answer:
Option (1)
Explanation:
Ripples (ripple marks) are formed due to the forward and backward motion of water over the surface of a rock bed or water bodies. They are usually formed when the flow velocity is less and the diameter of the grains is relatively small.
These are sedimentary structures that are found in many places. These ripples are divided into 2 types, namely the symmetric and the asymmetric ripples. Asymmetrical ripples are helpful in identifying the palaeocurrent direction.
These are formed when water travels over the surface, so it can be considered as the surface waves.
Hence, the most appropriate answer is option (1).
You walk 20 m north, then 5 meters south . What is your displacement?
-- You start out.
-- You walk 20 m north.
-- Then you walk 5 m south.
-- Your displacement, relative to where you started from is 15 m north .
ionic compound molecules have strong forces of attraction between neighboring molecules what conclusion can be drawn about material is held together by ionic bonds
Answer:
In general, the ionic bond is formed through transfer of electrons from metal atoms to non-metallic atoms. In this process the metal atoms loose their valence electrons to achieve a stable noble gas. In forming an ionic bond, two ions which have an opposite charges, move together due to attraction between opposite charges. The ionic compounds have very strong attraction between the ions. So the lot of energy expensed to overcome attractive forces and break the individual ions apart. The conclusion is the ionic compound dissolve easily, have high melting points and non malleable.imagine that two balls, a basketball and a much larger exercise ball, are dropped from a parking garage. If both the mass and radius of the exercise ball are 3 times larger than the mass and radius of the basketball, which of the two balls do you think will reach the ground first? Make a hypothesis below and describe your reasoning.
Hypothesis
Let there is no air drag or any other resistance force due to surrounding
Now the force equation of ball is given as
[tex]F = mg[/tex]
[tex]ma = mg[/tex]
[tex]a = g[/tex]
so the ball will be dropped down by acceleration a = g and this acceleration is independent of size and mass of the ball
So in this case both balls will be dropped by same acceleration.
So here both balls will hit the ground at same time
Final answer:
The hypothesis is that the basketball will reach the ground first due to its lower air resistance compared to the larger exercise ball.
Explanation:
Hypothesis: The basketball will reach the ground first.
Reasoning: When objects fall, they accelerate at the same rate due to gravity, regardless of their mass. The air resistance acting on the larger exercise ball will be greater due to its larger size, causing it to fall slightly slower than the smaller basketball.
Example: Consider dropping a feather (light but has air resistance) and a coin (heavier but less air resistance) simultaneously from the same height, and you'll notice the feather takes longer to reach the ground.
Consider a stone at rest on the ground. There are two interactions that involve the stone. One is between the stone and the Earth; Earth pulls down on the stone and the stone pulls up on the Earth. What is the other interaction? 1. All are wrong. 2. between the ground and the Earth 3. between the ground and air 4. between the Earth and air 5. between the stone and the ground
5. between the stone and the ground
for a stone at rest on the ground, we have two forces acting on the stone. first is the force on the stone by the earth due to gravity of earth. second is the force applied by the ground in upward direction to balance the force of gravity on the stone.
so first interaction is between earth and stone : earth pulls stone towards it and stone pulls earth towards it by same amount of force.
second interaction is between stone and ground : ground push the stone in upward direction and stone push the ground in down direction by same amount of force.
hence the correct choice is
5. between the stone and the ground
The stone at rest on the ground is not only interacting with the Earth through gravitational force but also interacting with the ground through what's known as a normal force. The ground pushes up on the stone with a force equal to the stone's weight, balancing out the pull of gravity and keeping the stone at rest.
Explanation:The other interaction involving the stone you're asking about is the interaction between the stone and the ground. According to Newton's third law, every action has an equal and opposite reaction. Therefore, as Earth exerts a gravitational force pulling the stone down, the stone exerts an equivalent force onto the Earth. Similarly, the stone's contact with the ground is also a significant interaction. When the stone rests on the ground, the ground exerts a force (the reaction force or the normal force) that balances the weight of the stone, which is the force due to gravity. As a result, the stone doesn't move further downwards.
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If you are pushing on a door trying to make it slide open if your friend stands behind you and helps you push how hase the forces changed
Answer
The net force applied will increase
Explanation
According to Newton’s second law , force is the product of mass and acceleration. In this case, when a friend joins in the pushing of the door, the total net force applied on the door increases and the door will open with much ease. Force=mass × acceleration,
F=m × a
Answer:
The force will change as the net force applied will increase.
Explanation:
If you are pushing on a door really hard, trying to make it slide open and if your friend is also stand behind you and contributes to help you push towards the door, then the overall force will change as the net amount of force applied will increase.
This is an example of Newton's second law according to which you need more force to move an object with heavier mass.
F = ma
Therefore, the force applied by you and your friend will add and the net force applied will be increased.
A star is 10 light years away from the earth.suppose it brightens up suddenly today ,after how long can we see this change?
We will see the star brighten up 10 years later, because it takes 10 years for the light emitted from that star to reach the earth.
Light year = the distance light can travel in 1 year
10 light years = distance that takes light 10 years to travel
Which statement best describes the motion of a mass on a spring
Answer:
Motion of mass on a spring can be described as "simple harmonic motion (SHM)". Oscillatory motion that follows Hook's law.An aircraft carrier runway is about 400 m long. The speed of a standard fighter jet is approximately 641 m/s. Assuming a constant acceleration, if a jet fighter is landing on an aircraft carrier at that speed, how long does it have to slow down to a stop before it falls off the runway?
In this question we have given
length of runway=400m
speed of jet=641m/s
we have to find time to cover 400m distance
we know that
[tex]time=distance/Velocity\\therefore\\Time=400/641\\=.624S[/tex]
if jet fighter is landing on an aircraft carrier at speed of 641m/s then it will have .624S to slow down to a stop before it falls off the runway
The time taken by the aircraft to come to rest on the runway is [tex]\boxed{1.25\text{ s}}[/tex].
Explanation:
Given:
The initial speed of the aircraft on the runway is [tex]641\text{ m/s}[/tex].
The final speed of the aircraft on runway is [tex]0\text{ m/s}[/tex].
The distance covered by the aircraft on runway is [tex]400\text{ m}[/tex].
Concept:
The aircraft moves on the runway and comes to rest under the constant acceleration during its motion. In this case, the acceleration acts in the opposite direction of the motion of aircraft.
The average velocity of a body that has constant acceleration during the motion is defined as the mean of the initial and the final velocity of the body.
Write the expression for the average velocity of the aircraft.
[tex]\boxed{v_{avg}=\dfrac{v_{f}+v_{i}}{2}}[/tex]
Substitute the values of initial and final velocity of the aircraft in above expression.
[tex]\begin{aligned}v_{avg}&=\dfrac{0+641}{2}\\&=320.5\text{ m/s}\end{aligned}[/tex]
The time taken by the aircraft to come to rest can be calculated as the ratio of the distance covered to the average speed of the aircraft.
Write the expression for the time taken by aircraft.
[tex]\boxed{T=\dfrac{v_{avg}}{d}}[/tex]
Substitute the values of distance and the average velocity of the aircraft.
[tex]\begin{aligned}T&=\dfrac{400\text{ m}}{320.5\text{ m/s}}\\&=1.248\text{ s}\end{aligned}[/tex]
Thus, the time taken by the aircraft to come to rest on the runway is [tex]\boxed{1.25\text{ s}}[/tex].
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Motion in one dimension
Keywords:
Aircraft carrier, runway, fighter jet, initial speed, landing, comes to rest, acceleration, average velocity, constant, distance, time.
The brakes on a truck fail as it approaches a car stopped at a red light. Use Newton’s first and second law of motion to explain what will happen when the truck collided with the car.
Answer:
The truck will hit the car at rest, causing the car at rest to have an initial velocity of the velocity of the truck right before it hits it, then after the truck hits the car, there will be an equal and opposite force, so that is what causes the cars to accordion, because the force that the truck exerts on the car at rest will also be exerted on the truck.
Explanation:
Since Newton's first law says an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an external force, we know that the external force is the truck and that will cause the car at rest to move.
When a moving truck collided with the car, according to Newton's first law, the inertia of both of the car and truck is be changed and According to Newton's second law, the smaller mass in between the truck and the car experiences greater change in velocity.
What is Newton’s first and second law of motion?According to Newton's First Law, a body in uniform motion or at rest will remain in that state up to and unless a net external force acts on it.
According to Newton's second law, an object's acceleration caused by a net force is directly proportional to the force's magnitude, moving in the same direction as the force, and inversely proportional to the mass of the object.
According to Newton's First Law, when the truck collided with the car, an external, unbalanced force operates on both the truck and the vehicle in a collision with a truck, causing the truck to suddenly slow down to rest and accelerate from rest. In case they are belted up, the other occupants in the vehicle are similarly propelled forward from a stop. You will be moving along with the car when you are securely fastened to it.
According to Newton's second law, the impact of force will be grater for smaller mass, that is, the smaller mass in between the truck and the car experiences greater change in velocity.
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According to Newton’s first law of motion, what must happen to move an object at rest?
Answer:
According to Newton’s first law of motion, a force must act on it to move an object at rest.
Explanation:
According to the Newton's first law of motion, for an object to change its velocity (either a change in the magnitude or the direction), there must be a cause to it which is defined as a net external force.
So for an object to move from rest, an external force must be applied to it.
Final answer:
According to Newton's first law of motion, to move an object at rest, a net external force must be applied. This law, also known as the law of inertia, indicates that an object will not change its state of motion without the influence of an external force. This demonstrates the connection between motion and forces.
Explanation:
According to Newton’s first law of motion, for an object at rest to move, it must be acted upon by a net external force. This law, also known as the law of inertia, explains that without such a force, an object will remain in its current state, whether that is at rest or in motion at a constant velocity. The crucial point is that any change in motion - initiating movement from rest, altering speed, or changing direction - requires the influence of a net external force. This force could be anything from a push or pull, to gravity or friction acting on the object.
The common observation that objects naturally tend to slow down and come to a halt is not due to inertia but rather the result of frictional or other forces acting against the object’s motion. Therefore, to move an object at rest, a force must be applied that is greater than the resisting forces, such as friction. This illustrates the fundamental nature of motion and forces as described by Newton’s first law.
hich are made of matter? Check all that apply. air bicycles sound waves people clothes sunlight trees
I believe that air, bicycles, people, clothes and trees are matter however sound waves and sunlight are not. :)
Answer:
air, bicycles, people, clothes, trees
Explanation:
A 9.00 kg mass is moving to the right with a velocity of 14.0 m/s. A 12.0kg mass is moving to the left with a velocity of 5.00 m/s. Assuming that these two balls have a head on collision and stick together, what will be the final velocity of the combination?
Answer:
3.143 m/s
Explanation:
m1 = 9 kg
u1 = 14 m/s
m2 = 12 kg
u2 = - 5 m/s
Let the velocity after the collision is V
By using the principle of conservation of momentum
Momentum of two bodies before collision = momentum of two bodies after collision
m1 x u1 + m2 x u2 = (m1 + m2) x V
9 x 14 - 12 x 5 = (9 + 12) x V
126 - 60 = 21 x V
V = 3.143 m/s
Thus, the velocity of the sticked bodies after the collision is given by 3.143 m/s.
To find the final velocity of two colliding masses sticking together, use the conservation of momentum equation. The total momentum before collision equals total momentum after collision, yielding a final velocity of 3.14 m/s to the right.
To find the final velocity of the combination of the two masses after the collision, we can use the principle of conservation of momentum. The total momentum before the collision is equal to the total momentum after the collision.
Step-by-Step Solution:
Determine the initial momenta of each mass:
Momentum of the 9.00 kg mass:
p₁ = m₁v₁
p₁ = 9.00 kg × 14.0 m/s
p₁ = 126 kg·m/s (to the right)
Momentum of the 12.0 kg mass:
p₂ = m₂v₂
p₂ = 12.0 kg × (-5.00 m/s)
p₂ = -60 kg·m/s (to the left)
Add the momenta to find the total initial momentum:
[tex]p_{total[/tex] = p₁ + p₂
[tex]p_{total[/tex] = 126 kg·m/s - 60 kg·m/s
[tex]p_{total[/tex] = 66 kg·m/s
Calculate the total mass after the collision:
[tex]m_{total[/tex] = m₁ + m₂
[tex]m_{total[/tex] = 9.00 kg + 12.0 kg
[tex]m_{total[/tex] = 21.0 kg
Using the conservation of momentum, the combined mass's final velocity (vf) is given by:
[tex]v_f[/tex] = [tex]p_{total[/tex] / [tex]m_{total[/tex]
[tex]v_f[/tex] = 66 kg·m/s / 21.0 kg
[tex]v_f[/tex] = 3.14 m/s
Therefore, the final velocity of the combination after the collision is 3.14 m/s to the right.
Where would the pauses be in the following sentence? The United States is, in many ways, a nation in love with statistics.
a.
after nation and love
c.
after States and with
b.
after is and ways
d.
none of the above.
Please select the best answer from the choices provided
A
B
C
D
The answer is b. after is and ways. You always pause after a comma before moving on to the rest of the sentence.
Answer:
Explanation:
It's none of the above. The sentence is complete the way it stands. There is no need for any more punctuation.
So the answer is D.
A 50 Kg box sits at rest on a 30 degree ramp where the coef of static friction is 0.5773. If your push was directed at an angle of 40 degrees to the ramp, how hard would you have to push to get the box to move up the ramp?
Given data:
m= 50 Kg,
W= m×g = 50 × 9.81 = 490.5 N
ramp angle (α) = 30 degrees,
coefficient of friction (μs) = 0.5773,
Push at an angle (Θ) = 40 degrees,
Determine: Push to get box move up (P)=?
From the figure,
Resolving the forces along the plane
W sinα + μs.R = P cos Θ --------------------- (i)
Resolving the forces perpendicular to the inclined plane
W cosα = R+Psin Θ => R= W cosα - Psin Θ -------------- (ii)
Solving (i) and (ii) and keeping μs = tan Φ, Φ = Θ
Pmin = W sin( α +Θ )
= W[ sin α.Cos Θ + cos α.sin Θ]
= 490.5 [ (sin 30.cos40) + (cos30.sin 40)]
= 460.9 N
Minimum push required to move the box up the ramp is 460.9 N
A 15W fluorescent light bulb uses operates for 30 minutes and produces 20kJ of light energy, what is the percent efficiency of the light bulb? Show work.
Given that ;
Energy (work ) Produced by bulb =20 KJ = 20000 J
Input power = 15 KW
Output power given by the bulb = Rate of doing work
= Work ÷ time
= 20000 ÷ 1800 (since 1 min = 60 seconds)
= 11.11 W
Noe, efficiency is the ratio of output power to input power
η = output power ÷ input power
= 11.11 ÷ 15
= 0.74
= 74%
Efficiency of light bulb is 74%
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If you were to apply a force of 15N to a medicine ball with a mass of 5kg, what would its acceleration be
Given that
Force (F) = 15 N ,
mass (m) = 5 Kg ,
acceleartion = ?
We know that, From Newtons II law
F = m. a
15 = 5 × a
a = 15÷ 5
a = 3 m/s²
acceleration of the ball is 3 m/s²
what describes why ocean currents are considered convection currents
Convection occurs because the oceanic waters heat up becoming less dense. This water moves above the cooler water, and give off its heat to the surrounding environment. As it cools, it begins to sink, and the process begins again.
The correct answer is Option B.
Explanation: When a fluid is heated unevenly, it starts moving in convection cells, carrying thermal energy from its warmer parts to its colder parts. Such motion due to temperature differences is called a convection current. Ocean currents may be considered convection currents because warm water rises and cold water moves in to replace it. Warm currents carry thermal energy from warmer regions near the equator toward the poles. Cold currents move toward the equator, making the temperature there lower than it would be otherwise.
What is the speed or a softball that travel 20m in 2sec
To find speed with distance and time, you need to remember the speed formula:
Speed = distance ÷ time
So we need speed and we have the other two values, we can plug the values in:
Speed = 20 ÷ 2 = 10
The measurement for speed in this case is m/s (metres per second)
So the answer is 10m/sThe answer would be 10mph