Answer:
Mechanical energy
Explanation:
Given that,
Potential energy of an object is given by :
P = mgh
The kinetic energy of an object is given by :
Where
m is mass
h is height
v is velocity of the object
The sum of potential and kinetic energy is equal to total energy or the mechanical energy.
Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.
The model correctly describes the locations of protons and electrons in the wave mechanical model of the atom is the <span>proton in nucleas, electron in regions of most probable location.
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Answer:
The element belongs to group 15 of the present periodic table
Explanation:
Isotopes have the same proton number, what differs is that they have different number of neutrons.
Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.
Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30
Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15
The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table
Mechanical Energy and Thermal Energy
Hope this helps!! :)
