an 80kg skateboard moving at 3m/s pushes off with her back foot to move faster. If her velocity increases to 5 m/s, what is her change in kinetic energy as a result

One way to refine aluminum from aluminum ore is to heat the ore with hydrogen gas at high temperatures. al 2 o 3, solid, plus 3 h 2, gas, plus energy in equilibrium with 2 al, solid plus 3 h 2 o, gas. a. decrease temperature b. increase the amount of al2o3 c. reduce the amount of water d. increase pressure