When an object is lifted 4 meters off the ground, it gains a certain amount of potential energy. If the same object is lifted 8 meters off the ground, its potential energy is

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

In 2002, the rare earth elements mine in mountain pass, california was closed because