91影视

The given data is listed below as,

• The mass of the object A$m_A=7\text{kg}$ .
• The initial momentum of object A is, ${\stackrel{鈫�}{p}}_{A,i}=\left(17,-5,0\right)\text{kg.m/s}$ .
• The mass of object B is, $m_B=11\text{kg}$ .
• The initial momentum of object B is, ${\stackrel{鈫�}{p}}_{B,i}=\left(4,6,0\right)\text{kg.m/s}$.

After the collision, the final momentum of object A is, ${\stackrel{鈫�}{p}}_{A,f}=\left(13,3,0\right)\text{kg.m/s}$.

This law of conservation of momentum states that the total momentum of an object before and after collision with another object becomes equal.

The first law of thermodynamics states that the change in the internal energy of a system is equal to the difference between the heat added and the work done by the system.

The work-energy theorem states that the net change in the work is equal to the change in the kinetic energy.

The law of conservation of momentum gives the initial and the final momentum of objects A, B, and the system. The first law of thermodynamics and the work-energy theorem gives the increase in the internal energy of the system along with its kinetic energies of them

$.-\stackrel{鈫�}{p}$(a) The expression for the total initial momentum of the system is expressed as,

${\stackrel{鈫�}{P}}_{initial}={\stackrel{鈫�}{P}}_{A,i}+{\stackrel{鈫�}{P}}_{B,i}$For ${\stackrel{鈫�}{p}}_{A,i}=\left(17,-5,0\right)\text{kg}路\text{m/s}$and ${\stackrel{鈫�}{p}}_{B,i}=\left(4,6,0\right)\text{kg}路\text{m/s}$

Thus, the total initial momentum of the system is$\left(21,1,0\right)\text{kg}路\text{m/s}$.