A 6.00 g projectile is fired horizontally at 250 m/s into a 1.50 kg wooden block resting on a horizontal surface. What is the speed of the projectile and wood after
impact (when the projectile is stuck in the wood)?

Argon, neon, and xenon are examples of

What belongs in the areas marked x and y? x: the internal energy of a piston system increases as heat is added and rises to a cool area y: as thermal energy is added to a container, some of the energy is lost to the environment x: as thermal energy is added to a container, some of the energy is lost to the environment y: the internal energy of a piston system increases as heat is added and rises to a cool area x: a cold spoon placed in hot liquid gets warmer y: thermal energy is converted to light energy x: thermal energy is converted to light energy y: a cold spoon placed in hot liquid gets warmer

What was the approximate temperature of the universe at an age of 1015 s?