The problem of a rock thrown vertically up
A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does it go b. how much time is required for the rock to reach its maximum height? c. what is the rock’s height at t=2.00s? (Posted by Merhawi) Answer: (a) u=15m/s a=-10m/s2 v=0 m/s [...]
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Why protons attract inside a nucleus?
What is the reason for proton- proton attraction inside the nucleus according to nuclear physics? (Sanjeev Asked)
Answer: Inside the nucleus where the nucleons are very close to each other, the force which holds them together is the nuclear force, which is the strongest force in nature. The electrostatic force between protons is negligibly small compared to the nuclear force. But the nuclear force is of a very short range, 10^-15 m.
The nuclear force is charge independent, i.e; the nuclear force between proton and proton, proton and neutron as well as neutron and neutron are almost the same.
Yukawa’s meson theory suggest that the nuclear force is an exchange force. The nucleons are bound because of constant exchange of the mesons.
The nuclear force is only felt among hadrons. At small separations between nucleons (less than ~ 0.7 fm between their centers) the force becomes repulsive, which keeps the nucleons at a certain average separation, even if they are of different types. At distances larger than 0.7 femtometer (fm) the force becomes attractive between spin-aligned nucleons, becoming maximal at a center-center distance of about 0.9 fm. Beyond this distance the force drops essentially exponentially, until beyond about 2.0 fm separation, the force drops to negligibly small values.
At short distances (less than 1.7 fm or so), the nuclear force is stronger than the Coulomb force between protons; it thus overcomes the repulsion of protons inside the nucleus.
However, the Coulomb force between protons has a much larger range due to its decay as the inverse square of charge separation, and Coulomb repulsion thus becomes the only significant force between protons when their separation exceeds about 2 to 2.5 fm.
(There are many terms introduced in the explanation. You can discuss them as comments for obtaining further details, if required)
Reference:
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Bringing Fusion Reactor to a Reality :: Read and Watch the efforts and Achievements
Know more about the Nuclear fusion Reactor and the efforts behind bringing it to a reality. Fusion – the nuclear process that powers the Sun – has long held promise as a potential source of energy here on Earth. But recreating such conditions under experimental conditions is far from easy, which is one reason why a commercial fusion plant is still many decades away. Still, if physicists and engineers can pull the trick off, fusion could play a massive role as a vital part of our future energy mix. 
If you are interested in knowing more and want to read various information and discussions related to nuclear energy, fission and fission, download the October issue of Physics World magazine FREE here.
Categories: Nuclear Physics Tags: Bringing, earth, fusion, fusion plant, issue pdf, nuclear fusion reactor, physics world magazine, plant, reality fusion, reason
