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Answer:
By Newton's laws. we know that when we apply a force in an object, then we also are applying acceleration, given by the equation F =ma, where F is the applied force, m is the mass of the object and a is the acceleration.
Now in this problem, we only have that James want to move objects from point A to point B. If the problem says that James does it at the same time for each object, then we could assume that each object has the same acceleration A.
F = m*A
then if the mass of the o
object increases, the force needed to move it at the given acceleration will increase also, then the object that requires less force is the object with less mass, in this case, the toy car.
But in this problem never says that the objects are moved with the same acceleration (or in the same amount of time), then we could apply the same force in the four objects and eventually the four will get to the point b ( for example, the refrigerator would take a lot more of time than the toy car.
The kinetic energy of the ball b is 12.3kJ and ball B to a is 14.2kj
The atomic number is the same as the amount of electrons and protons. For example:
Oxygens atomic number is 8 so the proton and electron count is 8.
Hydrogens atomic number is 1 so the proton and electron count is 1.
Here we have to get the reason for continues changing of the atomic model over the past 200 years.
The reason for changing the atomic model is-The results of further experimentation helped to revise and improve the model.
The development of atomic model occurred step-wise as given below-
1. Rutherford atomic model, which explained the result of electrical neutrality of atoms by discovering the nucleus of atom, but it cannot explain the stability of accelerated charge particle i.e. electron.
2. The concept of radiation was later explained by Planck's quantum theory.
3. After this Bohr introduce another concept of atomic model which can explain the stability of the electron and also a part of the spectrum of the atom, but it has the demerits on the fine structure of the atom and heavier elements.
4. Sommerfeld extended the Bohr's theory, which gave the light on the elliptical orbits of a certain orbit.
5. After this to explain the wave-particle duality of the electron, the wave mechanical concept was proposed by deBroglie's, which further extended to the uncertainty to localize the electron and its velocity at a time which is Heisenberg uncertainty principle.
6. Later the quantum mechanical approach to explain the atomic model Schrodinger proposed equation which effectively explain most of the phenomenon of the atoms.