The acceleration of the ball due to initially applied force.(F=ma). when this force completely converted into acceleration at 5.1m/s . after F=0 and a=0. so velocity is constant due to zero acceleration.
velocity and quantum particles
In quantum physics the particles move with velocity c(=velocity of light) , each particle energy is quantised. E=nhc/λ. this particles called quantum particles.
Where n is an integer.
consider massive bodies there is infinite number of quantum particles inside...
you know when resistivity is zero then cooper electrons move freely. but the problem is the entropy not equal to zero , the atoms in the superconductor vibrate its mean position. then how can cooper electron move freely?
According to theory of superconductivity, resistivity almost zero. Below critical temperature the entropy decreases markedly with cooling .
why resistivity zero when entropy not equal to zero?
my doubt is when there is an entropy there is a disorder. then how can move conducting electron...