A155 gram sample of copper was heated to 150.0ºc then placed into 250 gram of water at 19.8ºc. (the specific heat of copper is 0.385j/gºc.)calculate the final temperature of the mixture. (assume no heat loss to the surroundings)

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.