A copper bullet of mass 0.1 kg, traveling at 400 m/s, hits a copper block of mass 2 kg at rest and becomes embedded. The combined system moves with a velocity of 19.05 m/s in accordance with the conservation of momentum principle. Both the bullet and copper block are at 25oC initially. Assuming the stored energy of the combined system to remain constant during the collision, determine
(a) The rise in temperature (ΔT).
(b) Entropy (ΔS) change of the combined system. Assume the system to achieve a uniform temperature quickly after the collision and neglect any change in potential energy.