In Fig. 9-64, block A (mass 1.6 kg) slides into block B (mass 2.4 kg), along a frictionless surface. The directions of three velocities before (i) and after (f) the collision are indicated; the corresponding speeds are v Ai = 5.5 mis, VBi = 2.5 mis, and VB! = 4.9 m/s. What are the ( a) speed and (b) direction (left or right) of velocity VA/ (c) Is the collision elastic?
Chapter 18: Law of Thermodynamics Zeroth Law of thermodynamics: If object A is in thermal equilibrium with object B, and object B is separately in thermal equilibrium with object C, then objects A and C will be in thermal equilibrium if they are placed in thermal contact The first law of thermodynamics is a statement of the conservation of energy. o If a system’s volume is constant, and heat is added, its internal energy increases. o If a system does work on the external world, and no heat is added, its internal energy decreases Work done by an expanding gas, constant pressure: W = PV o If the volume stays constant, nothing moves and no work is done. o If the temperature is constant, the pressure varies inversely with the v
