Answer:Atomic model keep changing because the electrons around the nucleus are not fixed and they keeps rotating or changing their position in valence orbits around the nucleus.
Explanation:
constriction is made in a clinical thermometer why
subject :science (energy)
Answer:
The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken. It is easier for us to take reading. It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb.
Explanation:
Hope it is helpful....
Answer:
constriction is made in a clinical thermometer because it prevents the thermometric liquid from running back into the bulb.
Which statement is true? A) Cells come in different shapes, but are all about the same size—very, very small. B) Cells come in different shapes and different sizes. C) Cells all have the same shape, but come in different sizes. D) Cells are all the same shape and size—small and rounded.
Answer: B) Cells come in different shapes and different sizes.
Explanation:
Cell is the basic unit of life. Each cell forms the an integral component of the body of the living organism. The cell structure and function varies from organism to organism. The cells of the plants are comparatively larger than the animal cells. The plant cells are usually rectangular in shape whereas that of animals are usually circular or round in shape. The shape and size of the cells can vary depending upon the function and structure of the organism.
Which statement describes the difference between ionic bonds and Van der
Waals forces?
A. Ionic bonds involve the sharing of electrons between atoms, while
Van der Waals forces involve the attraction of nonpolar molecules.
B. Ionic bonds involve the transfer of electrons between ions, while
Van der Waals forces involve the sharing of electrons between
atoms.
C. lonic bonds involve the transfer of electrons between ions, while
Van der Waals forces involve the attraction of nonpolar molecules.
D. Ionic bonds involve the attraction of nonpolar molecules, while
Van der Waals forces involve the transfer of electrons between
ions.
Answer:
C. lonic bonds involve the transfer of electrons between ions, while
Van der Waals forces involve the attraction of nonpolar molecules.
Explanation:
Just did it
How much energy is transferred electrically by a 2000 W cooker in half an hour?
Responder:
E = 1440 kJ
Explicación:
Se da que,
La potencia de un horno de cocción es de 800 W
El voltaje al que se opera es de 230 V
Tiempo, t = 30 minutos = 1800 segundos
Necesitamos encontrar la energía eléctrica utilizada por el horno de cocción. El producto de la potencia y el tiempo es igual a la energía consumida. Entonces,
please help me i dont understand this
Answer:
the first arrow goes to the top right
the second arrow goes to the bottom left
the third arrow goes to the bottom right
the fourth arrow goes to the top left
A 15 n net force is used to move a 5kg box. What is the resulting acceleration?
A. 15m/s^2
B. 5m/s^2
C. 20m/s^2
D. 3m/s^2
Answer:3 m/s
Explanation:
The resulting acceleration to move the 5Kg box is equal to 3m/s². Therefore, option (D) s correct.
What is acceleration?Acceleration can be defined as the rate of change in the velocity of an object with respect to time. The acceleration of an object is a vector parameter with both magnitude and direction. Acceleration is also defined as the first derivative of the velocity w.r.t. time and the second derivative of position w.r.t. time and
According to Newton's 2nd law of motion, the force is equal to the product of the mass (m) and acceleration.
F = ma
And, a = F/m
Therefore, the acceleration (a) inversely proportional to the mass (m).
Given, the force used to move the box, F = 15 N
The mass of the given Box, m = 5 Kg
The resulting acceleration, a = 15/5 = 3 m/s²
Therefore, the acceleration of the box is equal to 3 m/s² when it is pushed with a force of 15 N.
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Temperature and Thermal Energy
Quiz
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TIME REMAINING
47:44
What happens when the thermal energy of a substance increases?
The motion of the particles in the substance increases, and the temperature of the substance decreases.
The motion of the particles in the substance decreases, and the temperature of the substance increases.
O Both the motion of the particles in the substance and the temperature of the substance decrease.
Both the motion of the particles in the substance and the temperature of the substance increase.
Answer:
the temperature increas
is solar system a natural system or human-made system
Answer:
Natural
Explanation:
Answer:
It's a Natural System
Explanation:
When the Solar System was formed Human didn't even exist. the planets clashed and a lot of changes happened to create earth and different planets.
Which is an advantage of storing data digitally?
A. It is easy to copy a computer virus to a device along with the data.
B. Other people can access personal data from unsecured devices.
C. The quality of copies decrease as more copies are made.
O D. It is easy to change the data if you have the right computer
programs
Answer:
D
Explanation:
Because I said so
What is density? Write a formula by showing the relation of mass density and volume
Answer: below
Explanation: Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume
Answer:
Density is defined as the amount of matter contained in unit volume of body
How does inertia explain why it is difficult to stop a moving
skateboard?
Answer:
(Example Person) has to push hard to get the skateboard started, but once it begins moving, it takes much less effort to keep it rolling over the smooth, flat pavement. In fact, if (Example Person) tries to stop the rolling skateboard, it may take as much effort to stop it as it did to start it rolling in the first place.
Explanation:
Hope this helps :)
How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule? two four six eight
Answer:
the answer is 2 electrons
Explanation:
The oxygen atom has atomic number 8, therefore its electronic configuration is
1s² 2s² 2p⁴
the sublevel s has a capacity for 2 electrons so it is full
the sublevel p has capacity for 6 electrons, as in this atom it has only 4 electrons it needs two (2) more electrons to have its full capacity and to achieve maximum stability.
Consequently the answer is 2 electrons
Answer: The guy above is correct!
Explanation: It is A. two
A hair dryer transfers 48K J of energy in one minute. What is the power rating of the hairdryer? *
Answer:
800W
Explanation:
48,000/60=800
The power rating of the hairdryer is 800W.
What is Power?Power can be defined as the rate at which work is done by an object. The S.I unit of power is Watt(W).
The formula of power will be
Power = Work done/time
A hair dryer transfers 48K J of energy in one minute.
1 minute = 60 seconds
P = 48,000/60
P = 800 W
Hence, the power rating of the hairdryer is 800W.
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How is solar energy used by plants?
Answer:
https://asknature.org/strategy/photosynthesis-converts-solar-energy-into-chemical-energy/#:~:text=Photosynthesis%20in%20plants%20converts%20solar,electrons%20and%20protons%20from%20water.&text=In%20the%20energy%2Dtransduction%20reactions,transporting%20molecules%2C%20ATP%20and%20NADPH.
Explanation:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. ... In the energy-transduction reactions, solar energy is converted into chemical energy in the form of two energy-transporting molecules, ATP and NADPH.
Answer:
Our planetary system is named the "solar" system because our Sun is named Sol, ... The spacecraft used up their power supplies decades ago.
Explanation:
100%
Look carefully at the diagram below, which shows two cells connected in series. What will the reading on the ammeter be?
Enter your answer as a number
Submit
1.5v
1.5v
Answer:
The reading on the ammeter is 0 ampere
Explanation:
When two or more voltage sources are arranged in series as shown in the diagram, the resultant voltage is given by the sum of the voltages by taking into consideration the direction of the polarities of the voltage sources which can be either series aiding voltage source configuration or series opposing voltage source configuration
In the series aiding voltage source configuration, the positive terminal of one voltage source is connected to the negative terminal of the next voltage source such that the current flows in the same direction in both sources of the voltage in the circuit and the resultant voltage source is given by adding the individual voltage sources together
However, in the series opposing voltage source configuration, the positive terminal of one voltage source is connected to the positive terminal of the next voltage source such that the current flows in opposite direction in both voltage sources and the voltage across the entire voltage sources is given by finding the sum of the differences of the opposing voltage sources
The arrangement of the voltage sources in the question is one of a series opposing voltage configuration and the voltage across both voltage sources is given by subtracting one (usually the smaller voltage source) from the other as follows;
[tex]V_{(series \ opposing)}[/tex] = V₁ - V₂
Where;
V₁ = The voltage of one (usually the larger) of the voltage source = 1.5 V
V₂ = The voltage of the other voltage source = 1.5 V
Therefore;
[tex]V_{(series \ opposing)}[/tex] = 1.5 V - 1.5 V = 0 V
The reading on the ammeter = The current in the circuit, 'I', which is given as follows;
V = I·R
∴ I = V/R = 0/R = 0
I = 0 A (ampere)
The reading on the ammeter = I = 0 A (Current cannot flow without the presence of a voltage).
PLEASE HELPPPPP!!!!!!!!!
According to Einstein, space and time are _____
dimensions. Masses in the universe _____
and are parts of a whole universe that has four
space-time, and the resulting shape of space-time causes _____ .
Answer:
Relative; curved; gravity.
Explanation:
According to Einstein, space and time are relative and are parts of a whole universe that has four dimensions. Masses in the universe curved space-time, and the resulting shape of space-time cause gravity.
The above theory is known as the General Relativity or General Theory of Relativity and it was published in 1915 by Albert Einstein.
Basically, it states that universe curved space-time is directly proportional to the energy and momentum of matter and radiation that is present. Thus, gravity is the universe curved space-time caused by massive objects.
Answer:
Complete the passage to describe one of the features of Einstein’s general theory of relativity.
According to Einstein, space and time are
relative
and are parts of a whole universe that has four dimensions. Masses in the universe
curve
space-time, and the resulting shape of space-time causes
gravity
correct on Edge2021
Bibek went to the swimming pool. he saw the pool to be shallower and is redy to jump into the swimmingpool . is it proper for him to jump? if not why ?
Answer:
A swimming pool appears shallower than it really is due to the phenomenon of REFRACTION. Due to refraction, from rarer medium( Air ) to denser medium ( water ), the pool looks shallower
Explanation:
Can someone pls help me with these questions I’ll give brainliest
Answer:
1= ionic bond
2 =covalent bonding
Explanation:
can answer the others sorry
Which is an example of potential energy?
A baseball player running the bases )
B. A baseball player doing stretches
C. A ball lying on the ground
D. A pitcher throwing a pitch
tell me why
Answer:
D
Explanation:
He is storing energy to throw it.
Potential Energy = Stored Energy
nich
Imagine that two birds leave the
same tree at the same time. They
both fly at 10 km/h for 5 minutes.
Why don't they end up at the
same place?
Answer:
hello
Explanation:
The less mass an object has, the --- its gravitational f
Answer:
The less mass an object has, the less its gravitational [force.]
Explanation:
Newton's Law of Gravity states that [tex]F_G=\frac{Gm_1m_2}{r^{2}}[/tex]. The two m values are the objects' masses, G is the gravitational constant, and r is the distance between the objects' centers. Notice how the mass values are in the fraction's numerator? That means increasing the mass of one or both objects increases [tex]F_G[/tex]. That also implies the inverse; decreasing the mass of one or both objects decreases [tex]F_G[/tex]!
I hope this helps you understand this concept a little more! Have yourself a fantastic day, 'kay?
can someone help me please
Answer:
I think its distance
Explanation:
when measuring how far a p.o art u can use mm
How many oxygens are in a pentoxide?
Answer:
four oxygen
Explanation:
The law of universal gravitation describes the relationships between
Group of answer choices
A. unbalanced force, balanced force, and net force.
B. speed, distance, and time.
C. speed, velocity, and acceleration.
D .force, mass, and distance.
Answer:
D force mass and distance
The molecules of a substance in a particular state of matter move freely with random motion. The average speed of the molecules is increasing. What is being described?
Answer:
A gas
Explanation:
A car traveled 140 km from El Paso, TX to Dallas, TX in 2 hours. What was the car’s average speed in seconds?
Answer:
Explanation:
first get the velocity value in km/h
140/2=70km/h
to change the value (kilometers per hour) to meters per second divide by 3.6
70/3.6=19.44m/s
A 0.42 kg soccer ball is moving down field with a velocity of 12 m/s. A player kicks the ball so that it has a final velocity of 18 m/s down field. What is the change in the balls momentum? and find the constant force exerted by the players foot on the ball if the two are in contact for 0.020 s?
Answer:
the change in momentum is 2.52 N·s
the constant force on the ball while in contact with the players foot is 126 N
Explanation:
p=momentum
m=mass
v=change in velocity
p=(0.42)(6)
p=2.52
The change in the ball's momentum is 2.52 kgms⁻¹
The constant force exerted by the players foot on the ball is 126 N
From the question,
We are to determine the change in momentum of the ball
Change in momentum calculated by using the formula,
[tex]\rho = m(v-u)[/tex]
Where [tex]\rho[/tex] is the change in momentum
[tex]m[/tex] is the mass
[tex]v[/tex] is the final velocity
and [tex]u[/tex] is the initial velocity
From the given information,
[tex]m = 0.42 \ kg[/tex]
[tex]u = 12 \ m/s[/tex]
[tex]v = 18 \ m/s[/tex]
Therefore,
Change in the ball's momentum,
[tex]\rho = 0.42 (18-12)[/tex]
[tex]\rho = 0.42 (6)[/tex]
[tex]\rho = 2.52 \ kgms^{-1}[/tex]
Hence, the change in the ball's momentum is 2.52 kgms⁻¹
For the force exerted by the players foot
Force is given by change in momentum with time
That is,
[tex]F = \frac{\rho}{t}[/tex]
Where
[tex]F[/tex] is the force
[tex]\rho[/tex] is the change in momentum
and [tex]t[/tex] is the time
From the given information
[tex]t = 0.020 \ s[/tex]
Therefore,
[tex]F = \frac{2.52}{0.020}[/tex]
[tex]F = 126 \ N[/tex]
Hence, the constant force exerted by the players foot on the ball is 126 N
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All forces acting upon a body are equal in magnitude
and opposite in direction. The object is initially
motionless and will remain motionless.
What is this condition called?
Answer:
Explanation:
It's called static equilibrium. The object is motionless and every force equals/cancels each other out
Limestone cave can develop when Limestone rock is weathered. The weathering of the rock leaves an empty space that forms the cave. Which of the following best explains how the Limestone weathered?
Answer:
he shape is like granite, other rocks like this are shaped in the weather.
Explanation:
He shape is like granite, other rocks like this are shaped in the weather.
What is Limestone?The primary source of the substance lime is limestone, a form of carbonate sedimentary rock composed primarily of calcium carbonate (CaCO3).
The minerals calcite and aragonite, which are various crystal forms of CaCO3, make up the majority of its material. As these minerals separate from water that has dissolved calcium, limestone is created.
Both biological and nonbiological activities can contribute to this, while biological processes—like the buildup of corals and shells in the sea—have probably been more significant during the past 540 million years.
Therefore, He shape is like granite, other rocks like this are shaped in the weather.
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